1969 Serie
1969 Series
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MAINTENANCE AIN'T
SO HOT... 0 rtHAT'S
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Issue No. 198 1969 Serie
IN THIS ISSUE

NUM l2 8. Required usage of AMDF by recipients.
= Data furnished in the AMDF holds precedence
e over like or conflicting data published in other
vl WORP authorized Department of the Army publications
*I '^ unless otherwise started in the letters of transmittal.
I U 00 a. Updating. All segments of the AMDF will
CHANGE 2 TOAR 700-1
That means that the numbers in the AMDF are IT ... the last word. So,
when your supply request is checked against your DS's AMDF, you know
it's the latest. And, if a number's not in the AMDF, you forget it unless
you want it handled as an exception-type request.

It might make you supply and
maintenance men a little happier to
know that all FSN's that appear in
PS are checked out against the AMDF
before they're printed. That includes
brand new numbers, too.
Happy maintenance with happy
supply!
P.S. You'll need a copy of SB
700-30 (Jun 68) to use with the
AMDF.

GROUND MOBIUTY 2-19, 37-46
TaTzaule II I lydraultne I)
215 Ic~teitn 2J I
11A-TonTruks913 leeulfin l

FIREPOWER 20-27
'.UAU Ifowduoft.. i
:MI 2I'a 45C
Sb aldm Cinoa*gr h 22

COMMUNICATIONSS 47-52
41 INAN7Me 41
45~~ IT-76ISO/R 41.

Re0Mua 41 Came09 sow"dd SIM

AIR idOBIUTY' 5"2 U
1Ier"Tonriu. U OV-I1 54
Samuale Tim 53 Stter Pop 54
tI 54 T416 55
AW NflubSawtm 5982 C"47'

GENERAL AND SUPPLY
KV1 Deane U WAC3
New Pubohfflfme 28 F
Supply 1. kl". M.17,I1. 25,21
111. 21. 44,45. 49, 5&.%4
Us. Of 111111 10ar pr ot f Meb Ph nok. -
tio.u blaw mI by Haadwautums
Depa"Issan a Ia ofte uy. 25 Firuty US.
OlSThj1ITION* In ciordance with ri- -
qurfants smlbitted 00 DA Funi 12-4
S~ J74Ti.i

G890-SERIES
11/4-TON TRUCK...

THE 5-QUARTER 15
/A HOT PERFORMER...BUT
IT NEEP5 A HOT OPERATOR.,

So )ou'.e met up with one of those new G890-series I-I/-i-ron trucks.
You figure she's got a good feel and's a hot performer, so you'ree going' steady.
Well, just ask any married guy how much he really knew about his gal when
he slipped that band o' gold on her pinkie-he'll tell you he learned puh-lenty
about her special little ways after the knot was tied.
Your 5-quarter M715 cargo truck or M725 ambulance has its quirks, too.
You can learn 'em the hard way or-read on:

...IN THE ARMY NOW
Your 5-quarter is a "militarized" version of a commercial-design vehicle It
has a 2-i.-ol[, waterproof electrical system and a bunch of other special Army
features.

.. ......
-. *~ .- .. .. .

YOU
HERE AGAIN?
... YOU PRETTY
STEAPY
CUSTOMER,
SJOE!!
^a'~ /^'

BONE YARD SUPPLY
After a while, you'll start leanin' on your canni-
balization point for a lot of repair parts. This's
part of the special maintenance policy you'll find in
TB 750-98-23 (Dec 68), Appendix B. This's the
same policy that spells out "maintenance expendi-
ture limits" for the M38A1 and M151A1 1/4-ton
trucks and others in the G740-, G758- and G838-
series 1/4-ton families.

TM* I9I2 (
TM I I w.6

I,
.1A

You'll find your Prescribed Load Allowance of repair parts in the -20P.
Now let's see what's really under all that OD paint, starting at the front.

I auminu I I IUWINb
When you're not using those
front shackles for towing,
they stay mounted behind the
bumper. Then they don't mash
into the bumper if you happen .
to "kiss" another vehicle. B
For towing, you remount
your shackles hangin' out
through the bumper slots.
Then you can hook up to 'em
with the towbar on an M62 or
M543 5-ton wrecker. */ _
Towing front-wheels-up calls for lifting with the wrecker hook at the center
of the bumper after attaching the towbar to the shackles.

When towing-your .5-quarter back-
ward, make sure the towbar's hooked
to the shackles under the rear bumper-
ettes-not above, or the towbar will.
mash into your 5-quarter's tailgate.
To tow rear-wheels-up,. loop a tow
chain through your 5-quarter's tow-
ing pintle and over the wrecker's hook

4 I

SHABCKLIS
HANGIN
OUTI

BRUSH WITH RUST

SHOOK
TOWBAR
UNDER
BUMPERETTES

-with the towbar latched onto the
shackles under the bumperettes.
You hang your front shackles out
through the bumper for flatcar tie-
down. If you have your shackles be-
hind the bumper, they'll strain against
the bottom edge of the bumper-and
bend it.

Take a squint at that tubular brush guard. If you've go
one without drain holes, make holes like the new production
jobs have .. it'll save you from rust problems.

MORE MUSCLE, PLEASE

Lug nuts need plenty of tightening to keep our v he.l
snug on the hub- 300 Ibs-ft.
If you don't have a torque wrench hands. just figure
that's about as much torque as the average guy can put
on with the truck's OEM lug wrench-but no standing
or jumping on the wrench.
And make sure the studs are centered in the lug nut
holes before you tighten the nuts down. If ) ou don't ha e
full-circle support on those nuts, you'll find %our wheel
bustin' up around the holes.

tIL i

1 DRAIN HOLES _r

T KFFP EM
A TIGHT

A REAL SHARPIE
If you get a new 5-quarter, check
rightaway to see that the rubber grom- GROMMET
met's installed proper-like where your
fuel filler hose comes through the body.
If your grommet's slipped part way out,
the sharp metal edge of the hole will
slice right through your flexible filler 6
hose. Work the grommet back in so it
protects your hose.
LESS MUSCLE, PLEASE

J There's no need to run your spare tire retainer bracket up
as far as you can muscle it. Some guys've bent the retainer
clean out of shape-even running the mounting bolt right
through the top of the frame.
1 BOLT BUSTIN' o
STHRU RAME Here's the right way to install your 5-quarter's spare tire
S'n' wheel:

I untebl o n 2 e h pr npae n esr ts(nee ewe h

I III-f I .

J__A

FROZEN NUT?
You can't see it, but there's a nut welded inside the frame where your spare
tire retainer bolt screws in. If you don't keep a little lube on that retainer bolt,
it can rust and freeze in the nut. Then when you try to turn the bolt, the nut
busts loose-and you can't get the bolt out. So you're in a fix.
But here's a fix for that fix. Cut off the head end of the bolt. Fish the other
end of the bolt (with the nut) out of
the frame. Get a new 9/16 x 12 UNC WELD HEX
hex nut and weld it on the outside of HEAD NUT
the frame, in line with the hole. Add TO FRAME
a new bolt, 9/16 x 12 UNC, 5.06-in
long and threaded 3.72 inches (you may
have to add threading to get this much).
Then you're back in business.
EXTRA SPARE TIRE
Nope, your 5-quarter's spare tire 'n'wheel AUTHORIZED OLD
won't fit the 3/4-ton trailer you're towing. So, IT? MAN/'
if you're going on a long haul, your CO may
want to authorize you to carry a spare tire'n'
wheel for your trailer. Your "can" point should
have plenty of spares tires'n'wheels from
3/4-ton trucks. And you'll need a lug wrench
to fit, too.
SPRING SHACKLE BOLT

WATCH THE SPLINES Pity that spring shackle bolt when
some guys get ahold of the head end
with a wrench and give it a twist-
they shear off the splines that hold the
bolt firm in the shackle. Then, if it's
USE "2" WRENCHES put back in this shape, spring action
will probably turn the spring on the
bushing where there's no lube. The
bushing's supposed to turn on the bolt
.where there is lube.
Save the splines by holding the head
end of the bolt steady with one wrench
while turning the nut off the other end
with another wrench. Puttin' the bolt
back, hold the head end with a wrench
and turn the nut on with your other
wrench.

GIVE 'EM A BREAK

Brake shoes on your 5-quarter are different from what you'll find on other
tactical wheeled vehicles-the front, or primary, shoe in each wheel has a
shorter lining than's on the rear shoe. Make sure you install 'em that way-
and they'll give you a brake.

A REAL
Now for a look at your muffler. Some
have cropped up with leaks along the
seam. A little leaking's no sweat, but a
lot of that carbon monoxide gas pour-
ing out right underneath your 5-quarter
can put you to sleep permanently-
especially if you're sitting' still with
the engine running, like during radio
operation.

And if you happen to have that brake
shoe self-center anchor block off the
backing plate, make sure you put it
back with the arrow pointing toward
the front of your 5-quarter. Otherwise,
your brake shoes won't fit against the
drums like they're supposed to and
you'll get quite a surprise when you
want to stop quick!

GASSER?

8

TRANSMISSION TIPS HEY, MURPHY... I IT
POSSIBLE YOU FOuNF'
Next stop your rear transmission P O W BE T PU FOUN
A WAY TO PUT 700
support. MUCH LUBE IN THE
Lube seeping down around here may T ANSMISSION ?
mean the support bolts that hold the
rear mount to the transmission are loose.
Get 'em checked or tightened. And
make sure there's a breather on top of
your transmission.

Speakin' of transmission lube, too
much GO (gear oil) can mean no go.
Your LO says to fill your transmission
just up to the fill hole. It's not easy to
get in more--but it's been done. What
happens? Gear lube works out of your
transmission and into your clutch. With
a slipping clutch, you go nowhere-
except into the shop for replacement
of the clutch.
So take it slow'n'easy when filling
your transmission-just to the fill hole
and no more!
LET 'ER
DRAIN
I C

I ^ W
Another thing that'll put the skids
on your clutch is forgetting to take the
drain plug out of the bottom of the
flywheel housing. With the plug in-
stalled, any oil getting into the housing
will build up and give your clutch a
bad case of slip-itis. Unless you're ford-
ing or driving through a lot of water
that flywheel housing plug stays in
your glove compartment.

SLOPPY KNUCKLES?
Scoot up'n'peek at your steering knuckles. You
may find 'em slopped up with GAA weepin' out. Or
it may be GO seepin' out of the differential past the
inner oil seal. This stuff'll thin your GAA so you
have both running' out.
So you have to clean and repack. And be sure to
check the inner axle shaft seal-replace it if it's bad.
Now back on your feet'n'let's hang into your
5-quarter's engine compartment.
9
)MRE

r

-~

COVER CAUTION R ANNG/ KUUM I T.'" 5
Take a gander at your cast aluminum rocker arm 7L 0 TO~QDU
cover. You're probably wondering' about cast alumi- 52'U WK
num crackin' if you turn those cover retaining nuts
down too far. You're so right!
That's why this should be stencilled on your cover:
RETAINING NUTS 5 TO 7 LB-FT TORQUE.
Any more'n that 'n' she'll split like an overripe 'I
melon! Or, if she doesn't bust, she'll spread and iV
leak oil like crazy.
EXHAUST MANIFOLD, TOO
Another touchy torque comes up
S. / (. when you're installin' the exhaust mani-
::. ., fold. Fact is, this comes up when you
get a brand-new 5-quarter.
On a new vehicle, loosen those ex-
haust manifold retaining nuts and re-
tighten 'em to 25-30 lb-ft. Do 'em in
the right order like it shows in fig
C-3 in your -20 TM.
NO MORE THAN Now stick to that torque limit any
0 L 30 LB.FT. time you're installin' the exhaust mani-
-... fold.

CUT OWN (
IN THEP RIME -
BY OVER-TORQUING!
PREPARE TO MOUNT AND...
Whoops-before you lay that hood back down
and button 'er up, there's a plain ol' bolt down in 1OOSF
there that could have an interesting story to tell. B01I
It's that top left mounting bolt on the timing chain
cover.
Your timing chain comes within a hair or two of
hitting this bolt under normal engine speed. But if
you rev up your engine too high, the timing chain
may reach out and run against this bolt and back
that ol' bolt right out!
But, if the bolt won't stay tight, have your sup-
port check for a bad timing chain tensioner.

... FIRE UP
Your -10 TM tells iou all about startin' and
operation' 'our 5-quarter.
It does nol tell iou to hit our gas pedal before
you turn er o\er-and that's because you're s'posed
to lease that gas pedal alone until your engine's
running.
Ma' be in our on n bucket o' bolts \ou like to gise
that ol' pedal a slap with %our foot before firin' up.
but if )ou try this stunt %ith \our 5.quarter, you'ree
almost sure to flood 'er. Then you'll hase a Aait
before tr. in' again to start 'er. Just gise 'er some
choke 1/2 a as n % arm father All ihe \as out
in real cold weather

'.. SPOOKY ENGINE?
You might be surprised someday when you turn off your ignition switch-
and find your engine just won't quit. Nope, it's not spooks -it's dieseling.
Probably your timing's off and your idle speed's too high. So get your timing
set right 5" BTC. And your idle speed should be set at 600-650 RPM.

SPECIAL IDLE
But 600-650 RPM idle isn't fast enough when your 5-quarter's totin' the 100-
amp alternator kit and you're operation' radio equipment. Too low an idle will
foul up your spark plugs in short order.
You can beat this, though-TB 750-981-3 (Jul 68) says to get a hand throttle
installed when radio operation calls for a higher RPM. The hand throttle should
be adjusted so you can maintain an idle of 1,000-to-1,500 RPM during radio
operation.

HES 5-QUARTER LOAD CLASS
MIL ITARY .
LOAD
CL ASSIFICAlION
POOP Bu r
REMEMBER
YOU USE
ONLY THE "C"
NUMBE12
ON YouR CC (loaded
vEHICLEo .
clas0
country)

M715 cargo truck with
3/4-ton trailer 4 .C
(combination vehicle) 05 E 2 H 4
C (loaded cross
country M725 ambulance
C (loaded cross-
countryl

E-3 H-6

M715 COMMON GEAR GIVING YOU...
INSTALLATION

You may've already found out the hard way that common installation kits for
your M37 (G741 series) 3/4-ton cargo truck aren't right for the new M715
1-1/4-ton job.
Hang in there. With few exceptions, help is coming. A revised SB 11-131 is
on the way with listings for the M715 and other new vehicles.
12

-3 H-44

No kit is planned for the Angry-46, because the Standard B set is scheduled to
be replaced by the AN/GRC-142. Which means you improvise, should you lose
your M37 to an M715. It's a matter of lengthening tie-downs and adding a few 2 x
4's around the Angry-46 shelter.
For the present the Angry-142 and the AN/GRC-122 radio teletypewriter sets
will be installed on the M715 in the S-318 Shelter, which was designed for the
M37 3/4-ton. Which means you've got to improvise to install the shelter, just like
with the Angry-46.
The AN/GRC-19 radio set installation kit for the M715 is available under
FSN 5820-937-9847.

SINGLE INSTALLATIONS
HERE'RE SOME COMMON AN/GR(-3, -4,-5,-6,-7, FSN 5820.926-7241
INSTALLATION KITS YOU'LL L_ G"P 5092
NEED FOR THE M715 AN/GRC-87 5820-926-7244
AN/GRC-106 5820-926-7256
AN/GRC-125 5820-926-7252
AN/GRC-160,-161 5820-926-7252
AN/GRR-5 5820-926-7245
AN/PRC-8, -9, -10 5820-926-7243
AN/PRC-25 5820-926-7248
SAN/VR-8, -9, -10 5820-926-7242
AN/VRC-12 5820-926-7253
AN/VRC-13,-14,-15 5820-926-7241
S(assigned to AN/GRC-3 series, but may be used for VRC-13-15

S SINGLE INSTALLATIONS
AN/VRC-16, -17, 18 FSN 5820-926-7242 FAN/VRC-47 FSN 5820-926-7254
AN/VRC-24 5820-926-7246 AN/VRC-49 5820-926-7255
AN/VRC-34 5820-926-7244 AN/VRC-53 5820-926-7252
AN/VC-43 5820-926-7251 AN/VRC-54 5820-926-7247
AN/VRC-46 5820-926-7252 AN/VRO-1, -2, -3 5820-926-7241

COMBINATION INSTALLATIONS
Combination installations are made by requisitioning the kit for each radio set.
In cases where retransmission is required with the AN/VRC-24 in combination
with the GRC-125, GRC-160, -161, VRC-12, -43, -46, -47, -49, -53, -64 and -65,
you need the kits for the specific sets plus Combination Kit No. 32, FSN 5820-
926-7250.
Request Combination Kit No. 24 for the VRC-43. It has the same FSN as Kit
32.
Installations with the GRC-87 or VRC-34 in combination with other radio sets
need specific kits for each set plus Combination Kit No. 31, FSN 5820-926-7249.
13

MULTIFUEL TRUCK... FUEL TANK GASKETS
YOU GOT
-BUM GASKET-V

There's no mystery about fuel tank leaks on your multifuel truck--if you've
got bum gaskets on your fuel gage sending unit or intank fuel pump.
Maybe the gaskets are missing!
Check 'em. Make sure you've got 'em- and that they're in good shape:
Gasket, fuel gage sending unit, FSN 2910-753-9072.
Gasket, intank fuel pump, FSN 2910-269-3464.
Washer, copper, FSN 5310-753-9073, used with mounting screws on both the
sending unit and pump (you might be surprised how many trucks've got leaks
from missing washers).
These gaskets and the washer are in TM 9-2320-209-20P w/Ch 1 (Jun 65) and
TM 9-2320-211-20P w/Ch 1 and Ch 2 (Apr 67). Except the fuel pump gasket
hasn't shown up yet in the 209-20P, but your support can get it for you from Ch 3
(Sep 66) to TM 9-2320-209-35P.
Natch, if you've got a truck-tractor, dump truck or wrecker, you check the
gaskets on both fuel tanks.

ENOUGH IS ENOUGH
You can't go overboard with exhaust
manifold bolts on your M151A1 or 12-16 LB-FT
other G838-series 1/4-ton truck. WILL DO IT
They get 12-16 lb-ft torque. Any
more than that and vibration will cause
'em to shear. Then you've got a big job
getting the bolt ends out of the cylinder
head.
When you're tightening up, be sure
you don't confuse them with some cyl-
inder head bolts, which can take much
more torque.Check page 2-109 of TM 9-
2320-218-20 (Aug 68) before you
tackle your next exhaust manifold job.
14

-SERIES STAKES FOR DO-IT-YOURSELF
TRAILER... WHATr i S F
PLEASE?

Dear Half-Mast, J
PS 186 gave the FSN's for complete panel assemblies for our M 27AIC 12-ton stake
semitrailers. However, since we can have the panel boards locally made, can you give us
the FSN's for just the metal stakes?
SSG G. E. P.
Dear Sergeant G. E. P.,
Here's the poop on complete replacement of metal stakes for your M127A1C
(and also for the M127, M127A1 and M127A2C) trailers:

THESE AR FSN NUMBER NEEDED LOCATION
THESE ARE
LISTED IN 2510 840-2152 4 Front
FED CAT 7510-840-2154 28 Fron4 (1)

CHECKING LEAK CHECKERS
No, Sir-e-e-e! Definitely not.
That's the word for everybody when it comes to using
compressed oxygen for testing gas tanks or radiators for leaks.
Here's why:1 'sie4
When oxygen comes in contact with the oil film in the radia-
tor there'll be a messy explosion. Or, if some oxygen remains
in the tank or radiator, the thing can explode when the welder
goes to work on it. w
So make a note in the noggin': If you ever see anyone reach
for oxygen to check leaks -because there's no air compressor
handy-halt him fast. Remind him he can use the air system
on the nearest truck to test for the leaks.

If you have an M60, M60A1 or M48A3 tank, an M728 CEV or an AVLB you
already have (or you may get through engine retrofit) the new water-separating
fuel filter. Engines with serial numbers 8950 and above already have it.
This 3- element filter takes the place of the 2-element secondary fuel filter,
I d ',AI llI::!-

BEFORE YOU START, LET'S
MEET 7"TE LIST OF
r CHARACTERS

and here's what you need to know about it:
You drain condensate from it daily after operation at the same time you drain
the primary fuel filter. The drill is the same whether you have the fuel/water
separator or secondary fuel filters and it goes like this ...

I NlAlIh Id :Z1 ra&.4

-4IM 4
THE OL P
2-ELEMENT
TYPE!
he

p- In case your AVDS-1'90-2 or 1'90-2A lacks these hands drain cubes and
salves. get sour smiling tracked %chicle mechanic to apply MWO 9-2300-382-
20 (Jan 68) while he can sill get [he M\VO kits for free. With the tubes you can
drain your fuel filters without having to take off the bulkhead access plates.
QUARTERLY SERVICE
Every quarterly service you replace the 2 water separator elements. You'll need
Kit: fuel/water separator, FSN 2910-801-1152 (5702738). This kit contains 2
water separator elements (11602062) and the preformed packing for the cover
(11610232).

0OR

II

J,1 1

I~LOltD]
(LOltD

3. (heck th prfre pakn incve.i
i t' in go dsa e ev tao e fi'

I ,,,. ANP CHECK
FOR LEAKS5

ANNUAL SERVICE
Leave the center (fine screen) filter alone unless you want to replace it. This
is done once a year. If it's removed by mistake you have to treat it like a new
center filter. To replace this filter you first take the power plant out of the
vehicle and then you do this ...

3. Cap the line and be careful not to let any dirt get into the line or into the separator when the
cover is off.

The center filter is in supply as Element: fuel/water
separator (fine), FSN 2815-808-2421 (11602061).
18

HYDRAULIC FITTINGS...

PLEASE DON'T SCREW 'EM UP!

ISW M

There's always an exception to the
rule!
When you're pulling your PM serv-
ices, you usually draw up on holding
nuts, bolts, fasteners, etc., just to be
sure they're tight.
With the sleeve-type hydraulic fit-
tings that connect up the hydraulic lines

in your combat vehicles, drawing up on
that nut could be your undoing! So
hold one, Podner!
Most of the leaks that develop in
hydraulic lines can be traced right back
to overtightening of these connections.

Somebody gives 'em just one more twist
-for good measure--and you've got
a leaker.
The rule of thumb for hydraulic fit-
tings is this: If they're not leaking, leave
well enough alone!
The sleeve nut for hydraulic fittings
is preset with an initial torque when it's
made. Which means it's ready to do its
job with a minimum of extra torque
after the connection is made.
You start the nut onto the fitting and
turn till you feel a rise in torque from
this point, give the nut just 1/6 more
turn (no less) and no more than a 1/3
turn.

If the fitting still leaks after applying
the 1/3 turn, give it a wee bit more turn.
If you go past the 1/3 turn just a bit
too far, the sleeve'll keep biting into the
tube and rupture 'er innards. A little
vibration and you've gotta leaker on
your hands.
19

M109 HOWITZER HAPPENING

Nothin'. Turn the reticle selection lever to the HE-M107 and let the HE-470
stay there, out of sight and out of mind. If it's also out of whack, no problem.
You don't need to have it replaced.
New M118C's will have one blank reticle and that's what old Ml18C's will
get at rebuild.

SEAL THOSE SCREWS
So you've just finished flushing your
Ml collimator with nitrogen like it says
in TM 750-116, and now you're about
to replace the 2 pan-head screws you
took out to do the job.
OK, hold it right there! O
Be mighty sure you put a dab of seal-
'| bing compound (MIL-S-11031 ... FSN
8030-275-8110) on the threads of both
screws before you work 'em in. Other-
wise, moisture could sneak right back
in there and fog up your gem again.
20

FIREPOWER M16 BLANKSMANSHIP...
CLOBBER THAT CARBON

? ? YoU BEEN
SFIRIN'
BLANKS

No two ways about it. When you fire blanks in your MI6A1 rifle. You gotta
knuckle down for real on your cleaning.
Reason: M200 blank ammo fired through the new XM15 blank firing attach-
ment (FSN 1005-921-5481) blankets the innards of your weapon with carbon-
especially the bore, gas tube and carrier key.
And, if you don't get this carbon out after every firing session, your M16's
gonna poop out on you. So, here's what you do:
Do the best cleaning job you know how before and especially after firing blanks. Follow Table
3-1 in your TM 9-1005-249-12 (Aug 68).

CLEAN THE CAS TUBE ON THE
BORE... CARRIER KEY OUTSIDE

Use bore cleaner (FSN 6850-224-6656 2-oz plastic bottle) when you get to the meaning right
after firing. But, if the carbon gets a chance to "set," get your armorer to help you use P-C-111 (FSN
6850-965-2332... 5-gal pail) on it.
Next, if your rifle starts to get sluggish-even after you've given it your best
A-i cleaning job-get it to your support outfit pronto. After about 2,000 rounds
of blank firing it'll need a new gas tube and it'll have to have its carrier key
taken off for expert cleaning.
Finally, if your M16's scheduled to go with you to where the action is-and
it's fired more than 500 rounds of blank ammo-make sure you first get it to
support for a complete going over. Real important!
A WORD ON THE XM15 BFA
No sweat putting the blank firing attachment on.
Hold it so that its flanges line up with the annular
grooves on the flash suppressor. Then force the ring
over these grooves and snap the lock. To take it off,
release the lock on one side at a time.
But easy all the way, both ways. Right?
21

MIHMLMIDTIAS A
Sure you are, but how sure are you about that .45-cal spitfire in your holster?
This chart will show you right off if your shooter's up to snuff. It sorta tags
along with the scoop in TM 9-1005-211-12 (16 Sep 68). If your piece has any of
these defects, get it to your armorer for a working over.

FRONT SIGHT Misalined,
loose, burred, not square.

SLIDE-Cracked, especially
at ejector port; interior
grooves and ejector port
burred.

BARREL BEARING Crack-
ed, bearing lug busted,
burred, badly worn.

BARREL Pitted, burred
near muzzle; bulged, worn
lands.

RECOIL SPRING PLUG AND
SPRING-Plug retainer RECOIL SPRING GUIDE -
busted; spring weak, short, Cracked, badly burred
bent, not latched, assem-
bled wrong to guide.
-" J SLI[
SAFETY PLUNGER Tube benl
loose, spring weak, slide
stop burred.

EPOO'

EXTRACTOR Badly worn,
weak; lip deformed, broken.

BARREL LOCKING RIBS-
Burred.

MAGAZINE CATCH Dam.
aged, won't work.

RECEIVER Cracked; slide
mating grooves worn,
burred; slide stop notch
badly worn, oversized.

MAGAZINE Tube, base
and follower burred, dented;
spring weak, bent.

SLIDE STOP Badly worn,
won't hold slide; notch
burred, deformed.

CHAMBER Badlb pitted.

FIRING PIN Blunted,
busted, not assembled right
in spring.

FIRING PIN STOP-Burred,
cracked, rusty.

HAMMER Cracked;
notches chipped, worn.

SEAR Badly worn, chip-
ped, burred.

SAFETIES Burred, worn,
cracked, won't work right
(check 'em all, too).

GRIPS Plastic cracked,
checkering badly worn;
screws, bushings loose.

IS IT A TANK? A GUN?NO..

IT'S THE M36

RADAR CHRONOGRAPH

You might've wondered
about it.
Like, just what is an M36?
Or heard some word
on it.
Or maybe you saw one
and your fingers itched.
And now,
your hang up is ended
and you've got your own
M36 radar chronograph set
in your hot, eager hands.
Naturally,
you want to pamper it
with PM.

Whether you use it on its tripod or
on the tail of a quarter-ton, handling
know-how will help guarantee accurate
aim control. Tell your M36 you love it
by eyeballing and supporting these
points.

Before you mount the chronograph
on itl tripod turn the 3 base-locking-
handles clockwise until they're secure.
Then back 'em off a full half-turn so
they're completcli clear of the recess

LOCKING
HANDLES

on the base. This allows you to slip the
chronograph on the base easily and
without bunging up either base or
chronograph. Lock the handles with
another clockwise turn.
Those handles atop the case are for
adjusting and elevating the set only.
Using them to lift or move the set can
only lead to grief. The set's too heavy
for 'em.

DON'T LIFT
WITH THESE! ..

The centered antenna feed is no
handle, period. An) change from true
position will give you wrong readings
on velocin. Bend it just a hair too much
and Nou may nor esen be able to pick
up the projectile.

Be sure the connecting cable between
the front and rear assemblies is inside
the case when you close the 2 sections.
That prevents cable damage.

If you've still got a pesky.
spring tension reset button, get
your direct support to replace
it with the better micro-sv itch
(Switch, Pushbutton, Mois- /
tureproof, FSN 5930-501 8 REST BUTlON
1749). It's on page 40 of TM )
9-1290-325. 35P and elimi-
nates the problem of broken or )
weak springs. 1
26

Big caution: your set uses 400-cycle current. Be sure your
power source is 400-cycle before using it... or prepare for
big problems.
Which brings up an all-new cable, Cable Assembly,
Special Purpose, FSN 1290-167-8311, recently added to the
M36 BIIL. The cable assembly looks like so:

When your HF-0.5 MD generator set is not available, the
cable assembly allows you to use the standard 3-KW, 400-
cycle spare FADAC generator. The assembly is connected be-
tween the FADAC generator adapter (FSN 1220-799-8913)
and the power cable of the M36.
Be sure to set the FADAC generator to 3-phase configura-
tion prior to using the cable assembly with the chronograph
(TM 5-6115-211-10 gives you the know-how on this).
A cable to avoid is the reliability rater (Cable, Spec Pur-
pose, FSN 1290-850-6006). Like, it juts out from the side of
the case sore-thumb style, ready to damage itself ... or you
... by snagging anything that comes near it.
Keeping your air filters clean is
a matter of common sense plus pay-
ing heed to the poop on page 47 of
TM 9-1290-325-12/1 (Jan 68).
Climate, the situation, insects, dust,
silt. etc. can clog the filter and de-
mand sometimes daily cleaning.
Ignore the filters and the guts of
)our M36'll heat up or otherwise AIR FILTERS
get damaged. A FLYIN' SAUCER
Finally, be sure there're no 7
metal objects in the path of the ,'
antenna while you're checking .
or using the set. This is espe-
cially important during checks,
when the antenna normally y
wouldn't be elevated. Metal in
S the way gives you false read- --
ings. = A

r1Ih sa elded la of rend pub.
of ilafres orguafMional maalit.
nanre peonnel Trhe fr t compded
from rwied AG DiWnlbion Ceaian
BuuRle. Far cusplerut dial m DA
Par 310- (irta 6.1, and Ch 3 (Nor
61d, TaWs. T'i, ef. DA Pare 310-6 fJ.
681. and Ch 2 f Jn 691. SC'. and SM'
DA Parm 310S (Da 681. MWO'l

TECHNICAL MANUALS
TM 1-10H-23C 24P C3. eb. OH122
TM 1.225. Dec. aNoqllon
IM 3-1040-209-12 C. Jan. MIO 1
Main Armament Mach Flare Throint
TM 3-4340-02-14, Nov. CNR Mask
RFld ABC MI 7 and Acressori
TM 5-2410-209-20P C2. Jan. Medlun.
Full Trnackd racto
TM 1-3105.237.1 C2. In., barlt
Moving Fqiap Giaden
TM 5-3a01-238-13. Od. 7 Wheel
Iron Dollyl lo Use Walk II C. d Cap
Hydraui Operated Scrp.p
TM 5-3805-239-20P. Dec. Earth
Moving EquJp Lodesn
TM 5-3820-210-20/12 C. Jan. Barber
Grm t 410-3G ScrIening Unit
Aggregala
TM 5-3895-272-20P, Dec 10.20 HP
MS GED CGs En
TM 5-3895-281-20P. Dos, model
KA -60 Feed. Aggregale
TM 5-3895-3"0-TP, DZ. DED Madl
UA -60 Aggroegate Dre
IM 5-395-3223-15, Dec. Pi Driving

TM 5-4120-229-12, NoH. 9.000 BTU
Flor Mid Air Cond;llMConr
rM s-431l0-276-iiP Duc. aM
Au Coupreuour
TM 5-432-2215-20P. Dec. Patrol
Cnlrn4 PumpS
IM 5-410-252-14, Dec. Freih Wate
Cantnf Pimps.
TM 5-4520-209.24P, De. 60.000 BTU
Spior Halein
TM 5-4940-200-251. Dec. Shop Equip
Sal No 3 Irurt amd Conloac Monl
TM 5-6115-275-25P, DOs. 10 IW
60 Cc Gan S.h
TM 5-611 5-27.20P. Noa, 3 IW
60 Ccr Erg Drn Gun Sai1
1M -II5--321.1S.No. 20IKW
60 Crc Eng Dr0. Gen SnI
TM 5-6115-329-23P. Dec. 0. ( DC
Gso Drn G0n Sel
TM S-6115-345-12 CI. Jn, 1 KW
60 Cvc Eng Dnn Gen Seal

TM 5-6115-407-15, Jan. 150 KW&
Up Eng Drvn Gen Sets
TM 5-6115-434-12, Dec, 100 KW
60 Cyc Gen Seat
TM 5-6665-202-25P, Dec, Land Mine
Detecting
TM 5-6675-210-20P, Dec, Surveying
Equip Telescope
TM 9-1010-207-12 Cl, Dec, MS
40 MM GL
TM 9-1400-425-20P, Jan, Redey.
TM 9-2300-257-10, Dec, Operpaort'
Manual for MS77A1 Carriern, M132A1
Flame Thrower, MI 06A, M1 25A1
Mortar, Ml 13AI Personnel and XM741
20 MM AAA Gun Chassis (XM163
Weapons Sys) (Vulcan)
TM 9-2320-230-ESC, Dec, M656 5-Ton
Cargo Truck, XM757 Tractor Trk,
XM791 Expons Van Trk
TM 9-2320-244-20, Oct. M715
1 -Ton Cargo Truck and M725
Ambulance Truck
TM 9-2330-286-14, Nov. MI31A3C
Fuel Srv Semitrailer Tank
TM 9-2350-215-20 C4, Dec, M60,
M6D0A Tanki
TM 9-2350-215-ESC C2, Dec. M60.
M60A1 Tanks
TM 9-2350-217-20 C4, Jan, MI08 and
M109 Hotwitzer
TM 9-2350-222-10 C6, Oct, M728
Combal Engineer Vehicle
TM 9-2350-223-20 C5, Jan, M48A3
Tank
TM 9-2350-300-20P, Nov, XM163 SP
20 MM Antiaircraft Arty Gun
TM 9-6115-202-24P, Dec, 577, 577A1
Carriers
TM 9-7022-C19, Jan, M48A2C Combat
Tank
TM 10-500, Nov, Airdrop of Supplies
& Equip
TM 10-500-10, Nov, Airdrop of
Supplies & Equip Rigging '%-Ton
Utility Trucks
TM 0-500-13 C3, Jan, Airdrop: M 01
%-Ton Cargo Trailer
TM 10-5410-221-24, Nov, Rigid Con-
struclion W/Air-Lock Expandable
Shelltr Tents
TM 1-15200-210-20 Cl, Dec. UH-ID
TM 11-5820-601-12, Dec. AN/FRR-79
Radio Receiving Set
TM 11-6125-239-20-1, Dec,
PU.544A/A Generator
TM 55-412, Nov, Aircraft Instruments
TM 55-1510-201-20, Jan, U-8
TM 55-1510-202-10, Dec, O-1

TM 55-1510-209-20P C2, Fb, U-21
TM 55-1520-206-20PMD, Dec, OH-23
TM 55-1520-206-20PMP, Dec, OH-23
TM 55-1520-209-10 C4, De., CH-47
TM 55-1520-209-20-1 C6, Dec, CH-47
TM 55-1520-209-20-2 C4, Dec, CH47
TM 55-1520-209-20P-1 C14, Feb,
CH47
TM 55-1520-210-20P-1 C2, Feb,
UH-I Series
TM 55-1520-214-CL C1, Jn, OH-6
TM 55-1520-217-20P-1, Dc. CH-54
TM 55-1520-219-20PMD, Dec,
UH-IA &
TM 55-1520-219-29PM1 A -20MP,
Dec. UH-IA &
TM 55-1520-220-20, Non, UH-1C
TM 55-1520-227-10 C17, Jan, CH-47
TM 55-1520-227-20PMI, Dec, CH-47
TM 55-1905-217-12, Doc. LCM-8
TM 55-2210-216-20P C2, Jan,
Roil Equip

LUBRICATION ORDERS
LO 5-2805-201-12, Dec, 25 HP Gao
Outboard Motor
LO 5-3810-219-12-1,-3 -4, Dec,
12 % -Ton Crawler Craon Shonl
LO 5-3020-239-12-1, Doc, Earth
Boring Equip
LO 5-3825-209-12, Dec, Road
Clearing Equip
LO 5-4610-208-12, De, 420 Gal/Hr
Woter Purificalion Unit
LO 5-4940-220-12-1 -2, Dec. Trk
Mtd Contact Maint Shop Equip
LO 5-6115-434-12, Dec, Goa Turbine
Eng Drnn Pow.r Unit Util Pack
LO 9-1430-502-12, Dec. Hawk
LO 9-2300-224-12 C4, Dec, M113,
M577, M577AI Carriers, M 06
Mortar, M132 Fiame Thrower

MISCELLANEOUS
DA Fo.r 2028, De. Recommended
Changes to Pubt
55 700-20 9Ch 1, Jan, Logistics
5 74046930-97-01, Jan. Part Drivr
Testing and Training Device
SC 3990-97-CL0-T6 DOe, Rigger'
Cargo Set
SC 4940-97-CL-E42, Nao, Auto
Mechanic' Tool Set
TB 55-1500-206-20/14, Feb, UH-1
Series
TB 51-1520-206-20/9, Feb, OH-23
TB 750-98-23, Dec. M151 Truck
TB 750-992-4 C4, Feb, RW ElR

WI irk

I'M GONNA '
IRTE A LETTEA
ro HALF- MAST.

Si WANT HIM TO
PASS THE WORD
ON THE CARE OF
TENTS ANP TARPS.

NOW, ThAT'S
k GOOP IPEA!

SY'KNOW, WHEN YA
COME TO THINK OF IT,
CANVAS IS A 1IG PART
OF F16HTING EQUIPMENT...

Dea

OUT
WILD V
TAKES
BETWEI
ANP M<
(NOT T(
FUNGuS
GOES L
TISSUE
EPIDE

SBE
CAN
IS T
ANr
AS

r 3gt Half-Nast,

HERE IN THE
VET, CANVAS
A BEATING'
EN DUST, hEAT
315TURE
3 MENTION
.) AN FABRIC
IKE FACIAL
IN A FLU
MIC..

iE' E FOUNP THAT THE
5T BASIC RULE OF
VAS MAINTENANCE
0 KEEP IT CLEAN.
D KEEP IT AS PRY
YOU CAN.

ON TRUCK
TARPS YOU'VE GOT
TO CHECK FOR
SMALL RIPS
AND WATCH
FOR SHARP
EDGES ON
CARGO LOADS!

Y'SEE, MOISTURE
RUINS CANVAS AND ALSO
CAUSES MILDEW,

/WHETHER IT'S TENTAGE
OR TRUCKS ON THE MOVE
-- POLES BRANCHES OR
ANYTHING RUBBING
AGAINST YOUR WET
CANVAS CAN CAuSE
LEAKS.

P SEAMS ARE A BIG
ANGER POINT... MOISTURE
COLLECTS THERE AND
MAKES A NICE, WARM,
WET, DARK PLACE FOR
FUNGUS TO GROW
AND EAT LP BOTH
L CANVAS AND STITCHING.

7 :
eI

PM OF YOUR CANVAS IS FINE
WITH CARE, FRESH AIR AND SUNSHINE.
WHETHER WEBBING OR TENTS,
AVOID MILDEW AND RENTS!
KEEP'EM CLEAN AND DRY-- ON THE LINE.

STORE
CANVAS
DRY
AND
LO.SE

KEEP \I
CANVAS -
AS DRY AS
POSSIBLE

Ml0

PATCH ANP
RE-TREAT
AS

IF YOU WANT TO DISPLAY THIS CENTERPIECE ON YOUR BULLETIN BOARD, OPEN STAPLES, LIFT IT OUT AND PIN IT UP.

(

TREAT YOUR TENT WITH TEXTILE PRE-
SERVATIVE COMPOUND FSN 8030-264-3840,
(5 GAL) DILUTED WITH STOPPARP SOLVENT,
IT'S FLAMMABLE ANP IT'S POTENT. SO
ALL FIRE INCLUDING SMOKING) IS'OFF
LIMITS' SEE CHANGE 4 CJAN 68) TO
TM 10-269 (MAY64),
PARA40, ON
HOW TO DO
IT. _

LOCAL

SYOU ONLY PATCH
SMALL HOLES (NOTOVER
43/4 INCHES) THATARE
NOT ON A SEAM EDGE,
.OR CLOSE TO HARDWARE.

FTIFF ZIPPERS? USE LUBE, RUN IT UPANP DOWN
F5N 9150-999-7548, oN EACH A COUPLE OF TIMES
SIPE OF THE TRACK...OR A TILL IT'S SMOOTH... BE
WAX CANDLE IF YOU DON'T SURE ZIPPER CLOTH IS
HAVE THE ISSUE STUFF!! PRY, CLEAN ANP
UNDAMAGED!

WHEN YOU'RE NOT USING
YOUR TRUCK, DON'T ROLL
THE TARPS UP TIGHT.
FLAP 'EM UP NEAT
AND LOO5 SO AIR
CAN CIRCULATE
THROUGH 'EM!

ON TENTAGE
ROLL 'EM UP ONLY AFTER AND KEEP
THEY'VE BEEN HUNG THE POLE ANT
UP TO PRY A SPEL / STAKES IN A
SEPARATE BUNP
ELSE THEY'LL
CAUSE MOLD

AND DON'T
STACKING MOVE A PILE
FOR STORAGE OF CANVAS
SHOULD BE AROUND UNLESS
ON PRY IT IS ON A
SEASONED PALLET...
LUMBER... FORKS RIP
GREEN HOLES IN 'EN
WOOD
STARTS
1 -A--ROT!

HEE'S A LIST OF PUBS AND KITS THAT'LL HELP TOU
TAKE CARE OF YOUR CANVASs
TM 10-269,(May 64), Ch 4 (Jan 68)
General Repair for Canvas and Webbing
FM 20-15, (Sep 64) Pole and Frame Supported Tents
SM 10-4-8340-All, (Jul 63) Tentage Repair Kit,
FSN 8340-262-5767
Fed Cat C5325-IL-A, (Jan 68) Kit, Slide and
Top Stop, FSN 5325-898-,41U
TM 10-8340-211-13P (Aug 67), Ch 1 (Mar 68)
Tent, General Purpose

^H-~i~i7^ I

11

WELL, THAT YOC
SHOULD DO IT... PIPN
HOPE THEY INVITE
PUBLISH IT! HALF-A
TO CC
OUT
VISIT

LIILvJ

Sg'MATTER OF FACT
rI PIP... WHY?

'T
E
AAST
>ME
'N'
US-
A?! i

Sit, S

SNOTHIN'... EXCEPT 1 THINK
WE'P BETTER SHAPE-UP
ON OUR CANVAS ,MAINTENANCE
BEFORE HE GETS HERE!
'A----

TARP TOSSING MADE EASY
Putting that tarp on your truck is a one-man operation, but it sure is a
heckuva lot easier to do it once you know how to fold it.

Pick up the lorp at split side Run your
fingers through the folds on each side and
heave it up to the floor of your truck.
5pcA^n
-) C

TARP TIPS
There are some things you can
do to make that tarp last longer.
When you tie it, the ropes should
be snug but not too tight. When
they're too loose the tarp'll flap
in the breeze, and when they're too
tight they'll cause your tarp to
tear.

r WASH OFF GREASE AND
OIL WITH SOAP AND WARM
WATER... RINSE WITH CLEAR,
ANP PRY TARP BEFORE YOU
FOLD IT AGAIN... IF YOU FIND
A RIP OR TEAR, TURN IT
< IN FOR REPAIR !1

OK MEN, LET'S PICK
UP WHERE WE LEFT
OFF LAST ISSUE...

FOR THE WHOLE CR_

CARGO NET-The cargo net won't work
right unless it's positioned inside the
bracket arms and all the snaps are se-
cured. If the net runs under the bracket
arms, change it.

FRONT HEADLIGHTS-

S riIrl

SURFBOARD WINDOW Not for stepping on. Cover it
with cardboard or protect it in an) other way your
local SOP calls for.I E R
FHEAT1T F E
FYWHAII(T EF

ENGINE EXHAUST-Water gets into the
exhaust when you wash your vehicle.
If enough water gets into the engine
that way you could bend a rod. So
make a cover out of some waterproof
material for the engine and heater ex-
hausts or tape 'em up when you wash
the vehicle.

EXHAUST
. ^

WATER CAN-Keep the
straps tight on your 5-
gal water can. Other-
wise, vibration against
the bracket could cut a
hole in the bottom of
the can.

DEBRIS SCREENS The 3
debris screens are hand)
for keeping out junk.
You can help keep 'em
in shape b> not walking
on them an. more than
necessary.

CLOSE THE DOORS Make
sure the battery and air
cleaner access doors are
shut before )ou traverse
sour turret. The bustle
racks can crush a lid left
in the upright position.

SAFETY CHAINS-The chains on
the turret ring screens are there
so the dricsr can remove it i
from his side or the rest of the
crew can remove it from their
side. That gies an emergency'
escape route in case the vehicle
is hit and some of the hatches f
arc out of business. So keep
these chains in good shape and lf
don't wire the screen in place.

BATTERY CHARGE- A good battery charge is impor.
tant because if battery soltage is low .our gun-
launcher tube can lose its elevation and drop sud-
denl) and without warning.

ME.

BATTERY OPERATION--Like it tells you on DRAIN HOLES--There's a drain hole in
page 2-29 of your -12 TM, don't oper- the battery compartment and one in
ate the M551 on battery power alone, the air cleaner compartment. Keep
Idle your engine at 750 RPM when 'em unclogged, they'll do the job for
you're drawing current from your you.
batteries.
If the batteries are taken out of the
vehicle (like for cleaning) make sure
they are put back right. If battery
polarity is reversed you can damage
electrical circuits. ENGINE AIR CLEANER-Take a
Couple seconds to check your
engine air cleaner every day.
If the indicator shows green,
it's OK. If red shows, the filter
element needs to be cleaned or
replaced.
STAB MODE-Use stab mode to track your target. Under no conditions do you
fire your main armament, either a conventional or missile round, while your
vehicle is moving in the stabilized mode. Bring the vehicle to a halt before you
shoot.
This applies only to main armament. It is OK to shoot the machine guns while
the vehicle is moving in STAB mode.
GROUND-HOPPING

WATER OPERATION /BEFOI YOU USE
YOUR M551 AS A

S YOUR PASH 12TM

i .1''rl-Vi OPERATION

Here is some extra info: lili. .
WATER STEER LEVER With the water steer lever in the LAND position, you have pivot steer
in first range and in both reverse ranges. With the water steer lever in WATER position you
also have pivot steer in second and third ranges.
SLOWING DOWN -In water you can
go into either RI or R2, but R2 gives
you more stopping power. Likewise,
when you're in reverse, you can slow
down by going into 1st (low). When-
ever you make this shift in either direc-
tion, first hit your footbrake hard to
stop the track.

COMMANDER'S HATCH
COMMANDER'S HATCH-During water DOOR SWINGS OVER
DOOR SWINGS OVER
operation the commander's hatch should LOADER'S HATCH
not bL in the full open po-sirilon so the
loader can get our of his ca n hatch in
a hurr if he has to
E'cn on land the commander hai to
be careful about ha.sng either half of
hi, plir hatch in thc full-open pniition
He can scrioudlI hurt a loader if he
s ing his cupol.. around too iar. If .
the lo,.der and oniomander %ork tro.
geth~r on this therc's no danger. :

SHIFTING NECESSARY--As soon as you get your vehicle out of the water, shift the
water steer lever into the LAND position. If it is left in the water position the
vehicle will have pivot steer in second and third ranges. This could cause an
accident if you tried a turn at high speed.
43

TIPS ON GUN/LAUNCHER

GUN/LAUNCHER--After cleaning the
bore of the gun/launcher, lightly coat
it with PL (lubricating oil, general).
This is important because the plug does
not keep all the water out. Unless you
oil the bore you're likely to get rust
and pitting.
The shell cases of the conventional
rounds are hurt by oil, so all oil has got -
to be out of the chamber before you fire. -

IS THE
Oil ALL-
SWABBED OUT
OF THE TUBE??F
I'M ABOUT TO
FIRE '

2-BOTTLE SYSTEM-The air compressor
should start automatically when the
air pressure gets down to 2800100
and stop when the pressure reaches
3200-100. If the air compressor does
not work right, order a new one under
part number 11644482.

BORE EVACUATOR-(Vehicles with serial
number 699 and below) keep it clean
because a dirty one could cause a flare-
back. Clean it for 3 days in a row every
time you fire.

MISSILE SYSTEM SELF-TEST
Suppose you get a red light when you flip up the system test switch?
This is supposed to mean that the part of the system that is red-lighted is not
in a GO condition.
Before you call your over-worked mechanic make sure the part is really defec-
tive. Remember, you can also get a red light if you do the test wrong.
Here're some common, easy-to-make goofs that will give you a "no go" on
the test even though the parts are really all right.

Red Lights Shows On What Is Really Wrong What To Do

Tracker ALIGN level was in the left Put lever in
position instead of extreme proper position and
right when test was made repeat test
or
Tracker Check-sight bulb is burned out Replace bulb and
repeat test

Sig Data Conv ERROR lever was in the right Correct lever
position instead of the left position and repeat
when you did the tracker align both tests
test
or
Sig Data Conv ERROR lever was in the left Correct lever,
position instead of maximum repeat test
right on the systems test

Tracker and Gun out of battery Find out which,
Sig Data Conv or make adjustments
lights both on In battery switch broken and repeat test

Careful on this: Remember that your XMTR switch is not to be left ON for
more than 15 seconds while testing or you could burn out the transmitter lamps.

GET ME THE
SUPPLY WORD FLOTATION BARRIER
REPAIR KIT!.
REPAIR KIT-The fiberglass repair kit -
for your flotation barrier comes under /
FSN 2540-929-8363. Page 9-152 of
Ch 1 to the -12 TM tells how to make J i -
repairs.
45 'P ",-AE

CAREFUL STOWAGE

Careful stowage is important for the
M551 because the left (loader's) side of
the basket is open and stray items can
fall through. If some metal object (say
a wrench) hits the power cable brush it
can burn up batteries, master relay and
other parts causing thousands of dollars
worth of damage besides putting the
vehicle out of action.
Signal flags and a gunner's seat back-
rest have got tangled up with power
cables and even, in one case, a roll of
green tape caused a lot of damage.

FIRE EXTINGUISHERS-
The portable extin-
guisher is a throw-
away item. Order a
new one as FSN 4210-
555-8837. For now you
turn the main extin-
guisher back to supply
when empty and order
a new one as FSN
4210-930-2625. Other
parts for the system are
on pages 111-112 of
TM 9-2350-230-25P/1
(Jun 66).

AN/VSS-3 SEARCHLIGHT-Your M551 ve-
hicles may be equipped with one of
these little beauties. Until you receive
the TM on the light, remember these
2 important points:
1. Do not look directly into the light
from close up when it is in operation.
The high intensity visible or infrared
could cause blindness.
2. Do not turn off the vehicle power
source until the exhaust blower has
stopped. Otherwise heat could build up
in the light and blow it up.

SPECIAL TOOLS AND EQUIPMENT: They're
listed in 3 different TM's. Here's what
you check to make sure you have every-
thing that's coming to you:

pae 10 -

Organizational Maintenance
for the M551 are:

tool kits

Set A -SI 4I1093058 10947686

Supplemental tool kit (authorized
- only for MOS 45G20 personnel on the
M551) FSN4933-921-7335 (5910355).

I 1H TRY THIS-
COMMUNICATIONS FOR YOU R
19 FOR YOUR
RF SLOT
You say you put the connector in the R S
slot but all you ever got was low RF -,.
output? *
That's not exactly peanuts, but if
your connector's on the end of a new
CG-1773A/U RF cable, some pertinent
PM might net you better output.
Like every Joe knows, the CG-
1773A/U is a popular attachment for
items like the AT-912, etc. But the con-
nector (UG-88E/U) on some new pro-
duction models is so stiff it backs the
connector head far enough off the re-
taining nut to recess the contact pin ...
which naturally is a drag on good RF
output.- -

CONNECTOR BACKS OFF

..AND THE
CONTACT
PIN RECESSES

Naturally, too, this limits the per-
formance of your AT-912 or any
other antenna system you use it with.
The easiest fix for this dude is to take
two wrenches and back the connector
onto the retaining nut real firm like.

SNUG THE NUT UP
TO CONNECTOR

Then, make sure you can turn the con-
nector without backing it off. It's good
policy to make sure the nut is snugged
up every time you connect the cable.
Part of the trouble is caused by bev-
elled insulation on some of the connec-
tors.
The bevel jams the nut firmly into
place, allowing the connector to back
off from it.
Older cables don't have the bevel
and are slightly different in other areas.
An improved cable (CG-1773B/U)
is on the way and will replace the CG-
1773A/U. The B model has a better
RF connector which should elimi-
nate some of the everyday problems of
the A model.
Whether you've got a new or old
connector, next time your RF output
ain't what it used to put, give the ol'
connector a shot in the rear nut.

AN/TRC-35, AN/TRC-36...YOUR WOS BL.Y CHASSIS

Naturally, you wouldn't take a the upper chassis and lettin' it wobble
chance on wobblin' the upper chassis around.
of your T-302/TRC transmitter while That could spell damage to compo-
the T-302's bein' shipped or handled nents o'course, not on your T-302,
for storage in transmitter case CY- but howsa 'bout some of those other
1341/TRC. Joes?

But a loose vibration mount (caused
by rubber-gasket suction from the inner
case cover) can cause trouble by acci-
dentally unlocking the front portion of

They ought get the word. So tell
'em, huh?
Never move the T-302 while it's
cased unless the vibration mount is
pushed in and engaging the shoulder
of the studs in the bottom of the upper
chassis.
You can make sure of this by depress-
ing the chassis toward the hinge when
you lock the vibration mount.

NO-ZAP RADIO DECAL

For a 3 1/4 by 1 5/8-in, red and white decal which reads: "WARNING DO
NOT START VEHICLE WHILE RADIO IS ON," fire off a DA Form 2407
work request to:

EammandlnqOffiter

A4TMl: Dir0toe ci Majntenunce

The adhesive-backed decals can be had for three cents each. Give the word-
ing, size and color on the 2407.
Stick 'em as close to the starter switch as possible, so's they'll grab the vehicle
operator's eye. .

It's easy enough to take off the dust
cover to your TT-76 ( )/GGC teletype-
writer perforator-transmitter.
All you've gotta do is jerk the -
Whoa now, whoa now, whoa now
. that's not right... you don't jerk
anything!
What you do is remove the dust -
cover's P12 copy light plug from the PULL THE PLUG
J12 connector of the power supply and
terminal unit. Then and only then LIFT
- do you carefully remove the dust COVER
cover by lifting it straight up off its
rubber mounting grommets.
Any lifting before you disconnect the
copy light plug and the power supply
and terminal unit connector is apt to
crunch or mangle either the plug or
the connector. LL3
THE MAST MOVES UP
Mast AB-577/GRC is coming up in this world... you
don't have to scan the Angry-50 ( ) TM's to dig up installa-
tion info on the mast the AB/577 has a TM all to itself.
You can eyeball TM 11-5820-538-12 (Jun 67) for installa-
tion details, guying instructions and the scoop on using
the AB-577 with a T-bar to support a pair of AT-903/G
antenna horns.
The AB-577 rates the new deal because it's now being
teamed up with other radio sets besides the Angry-50's.
For the AN/TRC-24 radio set, you'll want TM 11-5985-
295-15 (Apr 68). It covers the new antenna group, OE-15/
TRC-24, which will replace the antenna arrays that are used
in the Track-24's C and D bands.

3
3
3

/ YOU'VE NO DOUBT
HEARD OF THE GRUESOME
TWOSOME THE SLEAZY
SEVEN, THE HATEFUL EIGHTFUL
AND THE DIRTY DOZEN
RIGHT? WELL, MOVE'EM
OVER AND MAKE ROOM
FOR THE SCURVIEST
SCOUNDRELS WHICH
EVER DONE IN A PIECE
OF AVIONICS EQUIPMENT.,
THE THORNY THIRTEEN A

.-1

CHRIS [HE SPONGE s a joker who could ce
le bout dehydrsn or crystals in items like
le y sn ompa of the I-. This color-
bln lad cant tell the blue of on unsafuroted
crystal from the pink or white of an unhealthy
wet one This guy need some o n unhealthy
ing of the brain cells some polyunsoturot-
ng of the brain ells so's he'll change the
crystals when they turn color. If you need
some help via a dehydrator plugf t need'
plenty in th supply system herere

ERRONEOUS EARL follows Lousy and Ugly
in faithful fashion. His specialty is slipping
errors in logbook entries. Such as, his 2408-
17 s and dash 18's, and, oh shame, he won t
enter current MWO's on the 2408 5 You know
what to do about him.

For worse 'n Paddy, however, is BLOWOUT

BOB, who'd as soon lip a -amp, sow blow
fuse in a DY-107 dynamotor as not .. even
though the book says you use a holf-amp,
thoughrmal blow type. His over-powered handi-
normak has d ged more avionics equipment
than you can count. Hes ertainly no example
for a serious type like you to follow.

- -_

LOOSE LARRY is the guy which never bothers
to check on whether his homing antennas are
snug in their ferrules While you're checking
on his handiwork, be sure his forgetfulness
hasn't netted a busted antenna.

I sTAY LOOSES Sl
of ilY hardly gets
Value Of gu ge
ofle olsnuggi uy neve did lea
Ing up an eletrc. ,an the
Bca terminal.
4 V
K^ i M

SQUIRREay SQUEL-
squelch on his ba never touches
reception as a box and takes
s a necessary evil. Ie could
letss abut whether the seh is proper
set.. or even operative. Ho o e

11
.01,r

FOR TOGETHERNESS...

TORQUE,

SECURE THE
HARDWARE

WOT'S WRONG
WITH THE OL'GLUE
ANP WIRE:-(a)

Glue and bailing wire hardware did a pretty good job of holding early air-
craft together. Then along came the modern flying machines.
Keeping the vibrating, twisting, turning, rotating parts of a chopper in one
piece called for special nuts, bolts, cotter-pins and safety wire.
To keep a gear box or tail rotor, for example, from departing your bird in
flight requires a lot of attention to those little jewels.
Like-every time you inspect your bird make sure every nut, cotter pin and
safety wire is in place. Eye mating surfaces for chafing which would indicate
loose studs and nuts. G( mm, A
When you pull maintenance never reuse self-locking nuts and cotter pins in
critical places. This includes flight and engine control systems, rotor, transmission
and engine mounting systems and the like. You'll find this poop, and more, on
pages 30 and 41 of TM 55-405-2 (11 Jul 66) on aircraft hardware and materials.
Be sure to use a torque wrench to get the proper torque called for by the TM
for the specific type, make and series of your aircraft.
Don't take chances with those nickle-and-dime items. Make sure hardware
stays put. A lost nut can cost you your chopper .. even your life.

TUBE IN SUPPLY

If you Seminole mechs need a re-
placement anti-icing fluid tube for the
new-type propeller bulkhead, FSN
1610-842-6375 travel tube, P/N
B1887, FSN 1610-310-5912, is in the
supply system. That's the one you want.
53

SAVE THE CHIP Nuts to those THERE'S
DETECTORS self-locking jobs BETTER
holding the Cayuse WAY.
(OH-6A) main
transmission and e
.* tail rotor transmis-
sion chip detector
4HV,. -~_ OJ A- wires ... toss 'em!
It seems that the torque required on the self-locking nut is too much for the
terminal of chip detector, PIN VC13C.
Result? A broken or short-circuited detector terminal.
To prevent this type of revoltin' development the Aviation Systems Command
recommends you use lock washer, P/N MS35333-37, FSN 5310-579-0079, and
nut, electrical, P/N MS20341-6S, FSN 5310-999-4031, to hold the detector wire.
Torque the nut to 5-7 inch-pounds.
-The parts are already in the supply system and will be authorized in a change
to TM 55-1520-214-20P.

KEEP THE PIPELINE FILLED

If you aircraft supply-types find yourself with beaucoup unserviceable Mohawk
(OV-1) A-C generators, move 'em to depot for overhaul, pronto. Those babies
are in short supply. AVSCOM Msg AMSAV-R-EV 11-1383 (25 Nov 68) gives
more scoop on this A-C generator.

PRE-OIL WITH STARTER
There's no need for you bird mechs
to strain your eyeballs looking for a
pre-oil connection to hook up a pressure -
tank on your opposed-type recip engine.
You won't find one. Pressure-lube the-
dry gears and bearings by turning the .$
engine over with the starter, according -
to the poop in each bird organizational
maintenance pub and TM 55-405-5
(Sep 66).

Fuel fumes in the cockpit of your
T-41B Mescalero? ?
Follow your nose to the drip! drip!
drip!
While you're checking out the fuel
system, focus on the shutoff valve under
the floorboard in front of the co-pilot's CHECK SHUTOFF
VALVE CONNECTIONS
seat.
The connections on this baby have been known to loosen up due to vibration
... could be a loose nut?
Re-torque the connection nut to the torque value specified in the maintenance
manual that'll stop the leak!

Dear Editor,
It seems like maintenance types are always tearing their clothes and coming up
with cuts when working around Chinook (CH-47) engines with the cowling open.
The upper engine access cover and attached side covers are the chief culprits.
So, we took a file and rounded off the 4 corners of all 3 covers ... gets rid of those
sharp corners once-and-for-all.
One point, tho, make sure the corner radius is no more than 1 /4-in maximum.
Norman J. Dunning

(Ed Note-Good going. The Aviation Systems Command goes along with
your suggestion)

XM27E1 SUBSYSTEM:

You met Minnie
the High Rate
M134 Gun in
PS 179 when
she starred
with the M21
subsystem on
the Huey
Congbusters.

FIRST...

XM27E1

I EASY TO INSTALL
...IF YOU KNOW HOW."!!
IT CAN BE PONE IN
A FEW MINUTES.' y

Cayuse (OH-6A I
the "Loach."

The 7.62-MM gun's the same ... and ditto for its operation and maintenance.
But Minnie's a loner on this subsystem fires only from the left side of the
Loach. This takes a different type of installation, different sighting equip-
ment and several other differences that require special know-how from armament
crew and pilot.
You can install this system in 5 minutes or less. Just attach the mount assem-
bly to the hard points with 3 quick-release pins 2 on the floor of the cargo
compartment and one on the bulkhead. Then mount the XM70E1 sight and
rod assembly to the bulkhead with a bolt and quick-release pins and finally
secure the sight and mount and electrical connectors. Presto!
Your pubs TM 9-1005-298-12 and -20P (May 67) will clue you in
on the specifics, but here're some timely PM tips that'll ease the way to better
performance.
56

THEN...

LOADING, AMMO TIPS
Follow instructions on decal on in- --
side of ammo box lid and you'll be sure
to load boxes right. Follow the arrow! r_.
Watch for long rounds. Your job is --
easier if you have the 1500-round ..
preloaded belt. But you'll still have to
split a belt to get the full 2000 rounds
57

MOUNT UP!

AMMO BOX DECAL

ZJI
^S; -^'.

(J^V0 R

DON'T OVERLOAD

called for. So watch for the long round, Podner! And remember, NEVER load
more than 2000 rounds, or the ammo will bind and cause a gun jam.
Slide loaded ammo box on to the mount. Be careful not to damage the low
ammo load sensor switch. Lifting a 150-lb ammo box puts a strain on any
Armymech so you know what happens when it's dropped on the rear mount
assembly. It'll bend every time.

Eventually the chute adapter bends and
then the ammo jams up the works.
If it does, try this fix. Reinforce the
rear mount assembly by inserting a
piece of scrap stainless steel- 3 x 5-1/4
inches under the skin. Rout out a
hole for ammo to feed thru and drill
2 holes for screws to fasten the plate
down.

Ammo chutes get
the gentle treatment,
too. Nicks and gouges
cause jams.

When you lay that heavy ammo box
down on the mount, check to see that
container is in full contact with the
housing before you secure the latches.
If the ammo container is cockeyed and
the latches are tight the locator block
can cause a heap of damage to the con-
tainer.

Final check: Be sure the lid is latched tight. Dust. dirt.
debris are always being churned up by rotor blades and if
enough get into the ammo box you'll have an ammo-blam-o
for sure.

.H ook :*: t e *m inaTI: The dust seal in the hous-
ing and tube assembly can work
e e loose during operation Check the
whole assembly for security fre-
SCREW quently 'specially if you're op-
SAFETIED? rating in real dusty areas. If seals
are loose or gone, sand and dirt will
cause the gears to come to a grind-
ing halt!

CHECKING )
I'M CHECKIN '

When the gun is in the full down position, the bottom quick release pin -
which secures the sight control rod cannot be installed or removed. TIP:
Reverse the sight drive fitting and install the pin from the opposite direction.
Here's how: Remove adapter chute, then the nuts that secure the sight drive
fitting screws are easy to reach.

KEEP CONTROL
BOX CLEAN

CONTROL BOX

W Keep moisture, dirt, dust, what-have-you out of the
Control box, connections and connectors. If the gun stops
firing, trouble-shoot the ammo first... then the electrical
system. Take a look at the P1 plug to see if you have a
black receptacle means a short for sure. Replace cable.
You'll have no trouble hooking up the 2 electrical connections on the control
box assembly. Each connection is a different size and fits only one receptacle.
The gun drive cable assembly, which has plug P1 at opposite end, connects to
J1 and J3 goes to the XM70E1 gun sight.

CLEANING THE GUN

After removing the 3 large
bolts that hold the gun drive
motor on the gun, inspect all
gears for burrs and broken teeth.
Anything amiss here, notify di-
rect support. INF
~ITur TIMgI

When removing grease build-up on the main housing assembly, keep all sol-
vent off the front and rear bearings.
FRONT
REAR BEARING BEARING

KEEP SOLVENT
OFF THOSE
BEARINGS

Decal data plates for electrical gun-
drive motor curl up after a couple of
months use. This is the only place
where serial number is found, so why
not etch the number in the gun-drive
housing?

DECAl PEELING?

^BI^^ i /

XM70E1 GUN SIGHT
While mounted, just keep the beam- WRONG
splitter and housing lens clean. Soft
tissue or rag is called for. Never use
greasy paper or rag.
No grabbing the tapered arm way
out on the end it'll bend or break.
Also this is no hand hold for pilot, crew
chief, co-pilot or observer. When put-
ting the arm in stowed position, place
hand near lens housing and close firmly. RIGHT
To remove the lamp housing, remove
3 screws.
The bulb (lamp) is a 2-filament deal
and the light shines on the etcher fila-
ment. So when you check the lamp -

by flipping the lamp switch and you
find one filament broken, replace with
a new lamp. A 1-filament lamp while
hosing down a tree line is risky business.
If it gets busted there's no way to sight.
Right? Right!
--IE

SFROSTED SPOT FACES THE ; If you have to replace the lamp -
)NT OF THE HOUSING GE 844 )ou gotta be sure that the
Frosted spot faces reward the front of
the lens housing. It aill fit the other
w.ay, but you'll get light out the back
end ... a real bonafidc example of
Murphy's Law *.

"Murphy's law- If on aircraft part can be installed incorrectly, someone will install it that way.

ROUND-UP TIPS

When storing ammo boxes, never lay
anything on 'em. Bends 'em up every
time. A dented box will stop ammo
feeding for sure.
Watch to see that all ball bearings
on quick release pins are where they're
supposed to be in the pin present
and accounted for!
When you see the NO STEP sign
anywhere on the system or the Loach,
obey it.

You can't fire the XM27E1 subsys-
tem while the Cayuse is in certain flight
regimes like slideslipping, sideward
or rearward flight, autorotation and
partial power descents.
If your minibird hasn't had its hori-
zontal stabilizer modified MWO 55-

EASY I
//f1;A

1520-214-30/6 you can only fire the
minigun at the 4000-rounds-per-minute
rate.

Pilots will have to hold back on the
reins and use only 80 knots to push the
Cayuse though the sky when the com-
partment doors are off and the cargo
compartment is soundproofed.
If you have 40 Ibs of fuel or less
- or when the low fuel caution light
flashes, you can't do any uncoordinated
maneuvers.
If the cargo compartment is not
soundproofed, the Loach may be flown
with all doors off or with crew com-
partment doors on the cargo compart-
ment door off. You never fly the Loach
with crew doors off and cargo doors on.

WHO BLEVV I MAC TRIEp\
THE LIGHT TO CHANGE
THAT 28Y
PANEL

The 28V panel light on your 5KW
SF-5-MD Fermont generator set can
put your power pump out of business.
Some of these sets got out with the
positive terminal on the lamp base
wired to ground and the negative lead
wired hot-to the (+) side, that is. If
you try to change a burnt-out bulb
and scrape the lamp shield against the
socket, you get a direct short.
On these sets, any wire marked N is
a ground wire, and you hook the N pole
on this lamp this way to the lamp base.
The "hot" or (+) wire goes to the cen-
ter contact prong. Wiring is the same
for HF set lights, too.

On sour wiring diagram. you'lll see
that wires Li;AI8 and L-i3BI8 go to
the positive post on the light socket. It
LAMP SHIELD SHELL NEGATIVE
TERMINAL

S\I POSITIVE
SOCKET TERMINAL
SOCKET IS IN DIRECT CONTACT WITH SHIELD.
IF WIRES ARE REVERSED, A SHORT RESULTS.
is marked with a small (+) sign. Wires
P31A18N and P31B18N go to the com-
mon ground pole halfway between
your two panel lamps.
Check Figs 1-5 and 1-6 in TM 5-
6115-332-12 for the diagrams and
examine both of those panel light bases
while you're at it.

MIL STD ENGINE ONLY

IT AIN'T THAT
I'M UNGRATEFUL!!
... IT'S JUST THAT
A NEW oNE4 NOW
WILL AVOID
TROUBLES
LATER!

Want to get the jump on generator breakdowns?
You can head 'em off at the pass with the aid of TB 5-6100-201-15 (Jun 68)
Scheduled Replacement of Generator Sets.
All the regs and supply dope you'll need to get new sets for old are right in
the pub. Just fill out the forms and stand back-you want to give 'em room to
park your new rig.
Besides telling you when and how you make the switch, the new TB gives
a list (in Appendix II) of the whole Mil-Design generator family, tells you how
much service you ought to get out of commercial (or Performance Spec) sets,
what the red-line is on Mil-Design life -and even allows you a new engine on
Mil-Design sets up to 10-KW every 1500 hours. Now you want egg in your
beer?

EASY ON SHIFTING 440HA
Head off transmission lockups on
your WABCO Grader by using your
clutch pedal right. Leave that pedal EASE UP
about 1-1/2 inches off the floorboard EASY5
when braking or shifting while in mo-
tion. Otherwise, the transmission locks
in gear. Forcing to relieve the lockup
just breaks the lever. Free such lockups
by just easing back on the clutch pedal
a little ... then make your shifts. .

6exwoatC *a Sea
Your latest listing of components to
be removed from equipment assem-
blages and sets and reported as sepa-
rate end items is AR 725-8 (9 Oct 68).
You need it to update supply and equip-
ment log records. It includes FSN's, new
and old LIN's plus makes and models
affected. This AR supersedes DA Cir
725-11 (May 67) and USAMC Msg
19789 (Apr 68).
4ave ;ou Head 7 ? 7?
You're now authorized 5-ton motor
vehicle maintenance trestles, FSN 4910-
262-0392, in your common tool kits on
an "as required" basis. Ch 3 (Dec 68) to
SC 4910-95-CL-A74 (No. 1 Common)
and Ch 3 (Jan 69) to SC 4910-95-CL-
A72 (No. 2 Common) give you the word.
You don't get the trestles with your set,
but you order 'em if you need 'em.

Been scorching the canvas tail on your
PU-619M generator rig when you have
to move in a hurry? Well, burn no more!
Take off the exhaust pipe extension
between moves. Just protect your hands
when you remove the hot pipe, and re-
install it when you set up to work again.

PLL 9Fo Reserve
AR 735-6 (Nov 68), Army Reserve
Maintenance Repair Parts Procedures is
needed along with AR 735-35 for set-
ting up PLL SOP for the Reserve types.
And, where the 2 regs disagree, the -6,
has the last word.

tZeed cCa

r,4murwed av Rada? 7
If radio set installation units for your
XM706E1 light armored car have you
bugged, hang in there, friend. You need
installation unit FSN 5830-135-0148 for
the AN/VIC-1 intercom set; FSN 5820-
935-8164 for the AN/VRC-47 radio set,
and FSN 5820-143-3521, which handles
all of the following radio sets: AN/
VRC-46, AN/VRC-53, AN/GRC-125,
AN/VRC-164 and AN/GRC-160.

VDica'rd 7rat Gua4rd
Good, g-o-o-d news for all you radio
repairman types who've been bugged
by broken guards on AN/VRC-12 series
radio set components.
The beautiful word is in MWO 11-
5820-401-20/1 (17 Jan 69), which pro-
vides a set of handles.

Would You Stake Your Life bon
the Condition of Your Equipmentt

-- BRIEFS

GLEANINUr

+ LUBI
.Is I I