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URE 6OT AWE
ON THAT At
Here's an idea to improve the
PM on equipment. Other out-
fits could use the triangle
idea on posters, wallet
cards, decals, stenciled
on equipment, in unit
CW3 Jess R. Gallowa% S ;
THE PREVENTIVE MAINTENANCE MONTHLY
Issur No g19 1969 series
IN THIS ISSUE
MIoa. M109 M07 SP on. MIO
SP Howlizer 2-24 SP Howitzer 2527
GROUND MOBILITY 37-43
Uhl Switches 37 M115AL, MII5AIC.
MI51 38-39,41 MI18 41
5Ton Wrecker 40 MI49 Trailer 42
Taliate Chains 41 Automotive Tools 43
Elngne Starter 41 National Marings 43
AIR MOBILITY 44-49
Mohaik 10V-l) 4449 Loggina In MWD's
New TB 4 Aircraft Serial
Bird Bi0Vt) 49 Number
lorue Values 49 Iet FlllhL Time
AN!APM.156Tfestl et 52 ANGIRC-I06
ANARC-131Radli Ra dio Set 5455
Sel 53 Freq Holding 56-7
Bead Chain Replace ANIPFP.L
menl S3 AQ-2AI 5157
GENERAL & SUPPORT
6,M00lb ForklIf Trk 58 Daling DA Form
Stele Bunk Beds 58 2064 62
National Symbols 5l Starus Card Flle 62
M532 LaundryUnit 59 Spcial Toils 63
DA Form 3328 80 Suppl Teamnl l B3
Booking Exlone BruninF 300 MS
anile 01 Coiler 64
Inventorf Stamps 61 Neu Puilications 28
Suppir 188.8.131.52.10.,11 184.108.40.206B.21,37.
41. 551. 5. 220.127.116.11.64
Use of lungs lor prinltig of till publica-
lion has been apDIeoed by Headquarters
Departnenl lo the Arm 26 February 1968
DISTRIBUTION: In accDidance with re-
quirements submitted on DA Form 124
I I e Army
milism I I
BE YOUR OWN INSPECTOR ON YOUR
PRESENT SECURE '. .,
Use this inspection guide for M108 and M109 SP Howitzers to check over To save you time we use this sign which means "Present, in good con-
your vehicle before operations-and before the inspector does. edition, and Securely mounted." Think of all these words whenever you see the
Find out the weak points and get 'em corrected. That way you'll be mission lb sign.
ready-and the inspector won't be able to gun you down even if he is a super- Start from the front of the vehicle and work over the outside and then the
quick gig thrower with a fast-draw pencil. inside.
' A WALK-AROurJP
EYE-CHECK OF NOUR
5P VEHICLE 5HOULPE
START WITH THE
FRONT ENDPf /
FINAL DRIVE-Check locking nuts for
tightness and make sure the lacing wire
is intact. 4,%M%
TRN: ISSION OiL -Check by either
of the methods shown on page 9 of LO
9-2350-217-12 (Nov 64) w/Ch 3. If you
have an early design dipstick, make
sure a mark has been scribed 3/4 inch
above the ADD mark to serve as the top
mark for your operating range.
I FT EES Not bent,
welds not broken.
F TP-Service engine oil filters,
universal joints, speedometer adapter
housing, and final drive breathers
through transmission access doors. See
your LO and get your friendly mechanic
to help you
IOW HOI M, pin locks
OK, headless pin lubed.
FRO'P 0 1 i I -- All required areas
coated with flight-deck compound. FSN
5610-782-5556 gets you a gallon.
if .r1.1.r- inr1 ACCESS DOORS-Nut,
flatwasher and screw at each hinge
P Doors not warped. Hold-down
TI-'rNr i Ir Boll; all tight? If
steering, shifting or brake linkage is
not adjusted right, get your mechanic
to work it over.
TI rN r.1' rl II ii i '-You might get
either of 2 types if you order a trans-
mission filter for your vehicle. 1. A new,
single element, screen filter, FSN 2520-
740-3159, not yet listed in the parts
manual. 2. The familiar screen disk type
FSN 2520-730-6667 for the whole as-
sembly, FSN 4330-770-7862 for the
disks alone, and FSN 5310-737-4145 for
the flat washers you also have to order.
Clean either filter the way it says on
page 11 of your LO.
LIGHIS All headlight lenses posi-
tioned so lens pattern is vertical, not
horizontal. No lens cracked on service,
IR or blackout. All bulbs work. (If possi-
ble check headlights and taillights at
the same time. Looking directly into
headlights, either service or IR, from
close up is bad for your eyes. Test by
hand feeling. If the lens gets hot the
light is working.)
.i rjlrr SWITCH-The low-pressure
fuel-sending switch may not last too
long. If it shorts out you need a new
sending unit FSN 5930-888-7656 (Part
No. 10914602). Under this same FSN
the supply people may send you instead
a part marked MS 90530-2. Don't accept
it. Instead of completing the circuit
when the engine is running this part
completes the circuit when the engine
is turned off, so the reading it gives
you is useless.
(NOTE: On late production vehicles -Serial
No. 1123 and above-the switch is in a
different location but it is the same switch.)
f iiT .: ;il If you can't read the part
number here's how you tell if you have
the right sending unit on your vehicle
If you have the wrong one (MS
90530-2) when you turn your master
switch ON your rectlier cooling fan will
start turning It you have the right part
(10914602) when you turn the master
switch ON the rectiter lan will not
move until the engine has been started
and the sending unit is receiving a press
sure of between 9 and 13 PSI.
INOTE The Ion cooled lectfier FSN 5960
856 1316 is on all M108s and on MI09's
through vehicle serial number 1122)
f ." 1 'Ir" 6
V,\ -IS lilt ., -lilt
RECTIFIER Late production (Serial
No. 1123 and above) M109's have a
solid state rectifier, FSN 6130-999-
9825, not directly interchangeable with
the FSN 5960-856-1316 rectifier still in
stock. However, it's easy for your me-
chanic to install the new rectifier as a
replacement part in earlier vehicles.
See Figs 120.1 through 120.4 in Ch 3
to TM 9-2350-217-20.
ENGINE :'1: -Access door handle MO .
RECTIFIER KIT-If you Check oil level as called for by LO before
need a rectifier blower starting engine.
motor it's now in sup-
ply as part of rectifier
fan parts kit FSN 2590-
900-8311 on page 75
of Ch 2 to TM 9-2350-
217-25P/1 (Jan 65).
I 1i CARE If you find that your, ..
rectifier, FSN 5960-856-1316, is always,. '
burning out, have your voltage checked. t ui s '
It's probably too high. Test the way it o" n ou oner
says in para 24b on page 130 of your \ s sot In
TM 9-2350-217-20 (Jan 65). It could be I PY
you're turning the master switch ON
and OFF while the engine is running.
This will cause a surge of voltage that
can burn out the diodes in your regula-
tor or rectifier.
RECTIFIER 1..lr~ If this is not po-
sitioned right there'll be a pull on the
connector wires that will cause early
failure. Reposition harness to get rid
of sharp bends. Wrap electric tape
around exposed wires. If you have prob-
lems with loose connectors at the rec-
tifier the screws can be cleaned and
one drop of Sealing Compound, FSN
8030-082-2508, will hold 'em tight.
ENGINE ROCKER COVER-You some-
times get oil leakage at the rocker cover
gasket because of warping or loosening
of the cover knobs. Straighten the cover
if you need to, use a new gasket and
lockwire the 2 handles together to keep
them from working loose. (This also
keeps anybody from overtightening the
AIR r;i CT GRILLE- If you need to add
oil to the engine, open the air inlet grille
and add it through the engine crankcase
fill. Make sure the plug is screwed down
tight after you finish. Grille hold-open
support Pi, complete with pin hook
and chain. Check for torsion bar. If it's
missing or broken the door will be very
heavy. Torsion bar shield P.
OIL FILLER PIPE
TORSION BAR SHIELD
BATTERIES-Fully charged. Never let
them get completely discharged --i
ruins 'em. Recharge or replace if y.
drometer reading is 1.175 or less. (Walm
climate batteries identified by a oie
inch white dot painted on the top of tie
battery are fully charged at a reading
of 1.225.) Check daily for shorts or dead
battery. A shorted or dead battery will
burn out your rectifier or regulator.
Battery supports and retainers either
in good original condition or repainted
with acid-resistant paint. Cap verts
open, electrolyte to split ring, terminals
(Put the cables on terminals with
screw and nut positioned so when an
inspector pulls on it to check for tight-
ness he will tighten instead of loosening
it. Use only 2 fingers and light pressure.
If you have to adjust battery cables
wear no finger rings and disconnect
both ground leads.)
:.-AiiTf-'' ii .... DOORS-Lock se-
curely, hinges don't bind, seals M .
Be sure the rubber seals fit properly
in the corners.
s Lnolking pin and chain
o rei Inflatable seal at 10 PSI (if ve-
S hicle is so equipped). If seal is deflated, i
call your mechanic. Filter screen clean
S and in good shape.
iiNlii If the grille, trans-
mission, and battery door handles are
not tight enough, vibration can stretch
out the retaining pin holes and you OUTLET
could lose the handles. You can replace
loose pins with screws and nuts. If nec-
essary you can redrill holes in handles
,iSa ";l ,: --If there's no water the
pump should blow air which you can
feel at the outlet. Running the pump
over one minute unless the engine is
running lakes too much juice Irrnm he
GREASE GUN--The 7,000-PSI grease
gun issued with the M108/M109 did
not have quite enough pep for good
track adjustment. Turn it in and get the
10,000-PSI grease gun FSN 4930-766-
3545 listed as Item 15 on page 272.1
of Ch 2 to your TM 9-2350-217-10.
Takes sprocket wheel
FSN 2520-789-2204 (P/N
10954052) and wear
gage FSN 4910-908-7344
SINGLE-PIN TRACK SHOE ASSY
': (SIN(;L PIN ACK, The
2 self-locking bolts FSN 5306-990-
2631 (10930570) at each end of every
track shoe pin, FSN 2530-816-6503
(10919100), take 160-190 Ibs-ft. The
self-locking nut, FSN 5310-333-7350
(7982725) that holds on the track shoe
pad, FSN 2530-816-6507 (10913382),
should be tightened to 185-215 Ibs-ft.
DOUBLE-PIN TRACK SHOE ASSY
TORQUE (DOUBLE PIN T"' r- -The 2
self-locking pad nuts FSN 5310-052-
0349 (8712289-3) that hold the track
pad FSN 2530-799-0021 (10954048) take
30-35 Ibs-ft. The bolt, FSN 5306-900-
0400 (8743903-4), that goes through the
end connector FSN 2530-799-0022
(10954049), and into the wedge, FSN
2530-799-0023 (10954041), takes 75-85
Ibs-ft. Tighten when shoes are bent at
12 angle over the idler wheel. Do not
tighten when track forms a straight
place the track block
if they're worn to with-
in 1/8 inch thick at
tip of guide. (See TM
Takes sprocket wheel
FSN 2520-986-9891 (P/N SINGLE PIN
i iI'R4i nPod ...,,i TRA C -
ni 4 I ) 7 7
1m11I9 11 8
Ti : -Tension OK? (1/4-in clearance
at 3rd roadwheel from front). Replace
track pads that're missing or badly
chunked. (Pad should not be replaced
just because it's worn down level with
the shoe.) Adjust the way it says on
page 156 of your -10 TM. Pad should be
replaced when it is no longer useful or
when it marks up the roadway.
You can have either single pin or
double pin track but not a mixture of
both. Each system must have its own
sprocket wheel and sprocket wear gage,
like so ...
,* -,.1 SPROCKITS-No matter whether
you have the sprocket for single pin
or for double pin track, all sprocket
mounting screws are the same, FSN
5305-719-5235, and their self-locking
nuts FSN 5310-957-5071 should be
tightened to 90 lbs-ft.* All hub bolts,
FSN 5306-022-2122, take a torque of
ROAD WHEELS -Replace if rubber is
chunked or separated so badly that the
wheel "thumps" in use or if the metal
part of the wheel is bent, broken or
cracked. All 10 self-locking nuts, FSN
5310-982-6809, (formerly 5310-266-
4400), are torqued to 180 Ibs- ft.* Oil
to center level of sight gage. All 6
sight gage screws, FSN 5305-584-7944, HMMMMM
torqued to 12 lbs-ft.* Sight glass not OKAY..."' ~ N
cracked or leaking around the edges REPLACE IT.
SWHEELS-As above and 3 screws
(P/N 96906-35304-186) of track 3a. .
juster mounting bracket torqued to 320
lbs-ft.* Screw holding tracl a3ilu.ter to1
bracket torqued to 90 lbs-f-
Si PLUG SL -The plugs (Pil
)4 413 and 44461q) u~ed on the ve-
SO hicle suspension sometimes seize in the
holes and you're likely to strip or round
off the heads when you try to take them
REL SE HE BEED out. Two special 6-point sockets have
RLUASE THE S LEE been added to the basic issue items for
LUG SLOWLY... plug removal. Replacement plugs will
-BECAUSE OF HIH be made from high-strength steel. For
/ "iGREASE PRESSURE! now, though, be careful not to over-
tighten the plugs or use the wrong tools
to work on them.
* 10 PER CENT TOLERANCE
SHOCK ABSORBERS Re-
place if damaged or leak-
ing. After the vehicle has
been run they should be
warm to the touch but not
hot like friction snubbers.
If they're either very hot
or completely cold they're
probably not working. Have
your mechanic check 'em.
Nut, flat washer and cotter
pin fp at both ends. Nut
torque 150 lbs-ft.*
,A .o'r '
BUMP STOP 3PRAki ET
--Tight. All 4 screws
torqued to 320 lbs-ft.*
TORSION BARS -With a tanker's bar
try to pry up each wheel. If you can do
it the torsion bar is broken, and must
be replaced. Get the right one from the
4 listed on page 119 of TM 9-2350-217-
25P/1 (Jan 65). Never unwrap protec-
tive tape at any time.
SPADES Remove burrs or sharp corners. If the helical extension
spade spring FSN 2590-878-4173 gets broken or bent out of shape
the spade can-break at the hinges when you try to replace it. Check
this spring often.
- znUm E ,. L- "I .I1r or" I
SPADE SN's FSN 2590-933-6259 (11605642-1) gets you the left-hand spade and
FSN 2590-933-6260 (11605642-2) the right-hand spade. Pencil this info in your
SPA)D CABLF -Early production vehicles had a spade cable, P/N 7748577, but
MWO 9-2350-217-20/11 called for replacing this with an adjustable cable, P/N
10954637. To keep the cable length from changing, a jam nut, FSN 5310-655-9509
(MS 45691-22), should be installed.
S11,. 1 I,. y ACCESS COVLRS & i' '. --If situa- IF I 'i IrIt -The reel bracket -'. i The hinges on out-
tion permits, check bottom of hull. All does not leave enough room for the reel side stowage boxes will rust and break
covers and plugs 1 ._% toturniftheU17/GTplugisinstalledon unless they are lubed frequently. They
out before you put the reel into the like it says in your LO.
E1El- ... 'I I III' I FRMINAI S-Turn bracket. Check condition of wire and
freely, hole not corroded shut. NEVER tape up any bare spots.
COME IN-- Oma
COME N, REP
OGO- WHO LUBEP THE
BASIC ISSUE I -All items g% TELESCOPE BAIL II I.V R- All (0 Y 0 D DOOR -Hold open latch
and located according to diagrams in hooks, pins and chains \ .U U / lock and latch lock pin [b .Both outer
TM 9-2350-217-10 on page 287 for M108 (NOTE: n high humidity ireaQ you (an and inner locking handle %.
or page 290 for M109, for exterior stor- o,,,, ,,, rod,,,n n fh, ,q,,i N" REMEMBER THE
age.(See other TM diagrams for interior q,,. ... ,. ,, 1 CLiATE, T HE RAIN AND
and hull storage.) .,,, ,,, k ,, ,, .,, ,,,,,, MI ION REALLY IECIDES
i"h I ,,, i... .. ..... ... "...i OU THE T'PE OF P M
1 --- '.*. *_O'' yoUUSE.
and hold open lal:h f Torsin bar B .
rnl broken cojmpenale.: or weight to
TRAVEL LOCK FPah', -
1. To prepare for fast
action "hip shoots"
some crews have been
removing the top half
of the travel lock. That
lets them get out of
travel lock just by ele-
vating the gun tube from inside the
turret. There are times when this can
be very handy.
2. Handy it is but dandy it isn't. Firing
at a low angle you run a big risk that the
muzzle blast will beat up an unsecured
travel lock. Always strap it down before
firing if you can.
TRAVEL L'I: !'M I i1,'I All parts FP
including the hold-down strap. (If your
M109 has Serial No. 99 or any serial
number 94 or below, it'll have a latch-
type hold down. If it has a number
higher than 94 (except 99) it will have
a stop-type hold down.) On late model
(above 94) hold downs, the lug-mounting
screws (P/N 35303-110) work loose be-
cause of vehicle vibration. Have these
screw heads drilled and laced with
THE HIP LIKE JOHN
WAYNE. BUT STRAP
DOWN YOUR TRAVEL
MUZZLE PLUG-Some M108 crews
have been keeping their muzzle plugs
from getting lost by securing them with
a piece of wire.
CHECK IT OFTEI
WHEN YOU USE
A MUZZLE PLUG. _J
MUZZLE BRAKE (M109) Check for
cracks around the baffles. If you have
cracks longer than an inch, ask your
support for a new muzzle brake. Keep
your muzzle brake locking ring on tight
and your muzzle brake lock secure.
Check 'em when you can during pauses
TORQUE KEY M 11.11 If your howitzer tube torque key (guide key)
is worn out the tube will not be guided right in recoil and counter-
recoil. So, to keep the key in good shape, lube it after 500 rounds
and check often for wear. When the torque key has worn .021 of
an inch it should be replaced. Previous experience indicates this
amount of wear will occur in about 1500 rounds of firing.
i~L I.BF'EATIR :i:fII liJ,1 Mlur? Check the
recuperator pins the way it says on page 18
of your LO and add hydraulic fluid if needed.
BORE ., ,' 'i.',.- The 2 0-
rings tend to break when the evacuator
is being installed ... So give 'em a light
coat of GAA, graphite grease or molyb-
denum disulfide (The moly comes in 1 qt
cans under FSN 9150-390-5690;.
The dust cover and the reco:1 mech.
anism get damaged by the evacuator
locking key and the check valve caps
coming loose so check 'em during luring.
1'1 1 :' .11i: (M108)-The evac-
uator lock can come loose during firing.
Check it often and, if you can get your
CO to OK the deal, have it lockwired.
/ES The bore evacuator valves have to be cleaned every day after
firing in both the M108 and the M109. This is important because if the valves get
dirty, smoke from firing will get into the fighting compartment. The M109 should not
be fired unless all 6 valves are installed and torqued to 75 Ibs-ft. If they are loose
or left out the thread in the barrel will be damaged.
BORE EVACUATOR VALVES
MUST BE CLEANED
EVERY PAY AFTER
I I RING
INSIDE THE VEHICLE
111 STRUT -F[141 : M I' Lock- PERSONNEL HEATER-Check opera-
strut pedals (spade locking lever) and tion. If ventilating air stream smells of
latches (one each side) work in both fuel, you have a fuel leak. Call your me-
locked and released positions? chanic. Heater protective screen miss-
ing? Forget it. It was left off of M109's
starting with vehicle 675. For identifica-
tion, it's Item 5 on page 149 of TM
GUN SHIELD SEAL If your M108/M109 is so equipped, pump seal to 5 PSI. If it
leaks use soapy water solution to find the leak and repair it. (When the howitzer
cannon and mount are scheduled for removal, the gun shield seal should be removed
and not replaced.) Fig 346 in TM 9-2350-217-34/2 has the details.
COVFR PLATES-The 2 rear torsion
bar anchor cover plates can get beat
up when you load ammo unless you
cover 'em with wooden blocks or rubber
AIR CLEANER FILTERS-Clean, service-
able, no holes or rips. Filter element is
FSN 2940-537-1070 for old type and
FSN 2940-999-8587 for new type that
you clean without taking apart. With
the new type you don't need your
SLIP RING SEGMENTS (Contact
boards), clean, not pitted, no accumu-
lated dirt or grease, should be com-
(NOTE: On 4th year M109's, Serial No. 1123
and above, there's only one segment, FSN
FIR' E TiirjiiI'.HER '.EAL The fixed
lire extinguisher is sealed only at the
control head, not at either of the pull
handles (One handle is in the driver's
compartment and one outside on the
hull Don't let anybody gig you for lack
of seals on the handles you should t
1 4'.LI- [ f H l iT I f .' 1F". Check
out manualpower selector lever and
speed selector lever On the power-
manual selector, the rear (leh) position
is MANUAL and the forward (right) posi-
lion is POWER On the speed selector
the rear (leh) position is LO and the
forward (right) position is HI. If the
selector levers won't engage freely,
never force them Slowly rotate the
handwheel in either direction and lightly
push the lever until it engages (See
Fig 55 in Ch I to your .10 TM).
,l1r,1 ',,, i r-f'Ir- Some ammo rack
pins can vibrale out during vehicle
movement because there's not enough
tension on the spring FSN 2590-874-
6751 (listed as Item 30, Fig 80, in
Ch 2 11Oct 67 TM 9-2350-217-25P/2)
Replace weak springs as necessary and
if you bend a little curve in the pin it
is less likely to vibrate out.
and before firing. Keep
slightly over-filled rather
than slightly under-filled. If
it is slight over-filled the
worst that can happen is
that you will lose some re-
coil oil. If it is underfilled,
the counter-recoil can be
too fast and you can crack
a tooth on your breechblock
operator rack. It will also
ruin the cam roller and burr
the cam path.
EQUILIBRATOR (M109 early production)- Adjust for both ground slope and temper-
ature the way it shows you on pages 163-164 of your -10 TM. On late model M109's
there's no adjustment for ground slope. ------
2\ I I IC
CYLINDERS SCORED The walls of
some equilibrator cylinders are becom-
ing scored, which allows oil to by-pass
the piston. To prevent this, use clean
hydraulic oil in equilibrator system and
in dusty climates. Keep a rag over the
relief valve so dirt won't get in there
OUT OF BATTERY-If you fire the GUNNER'S HANDLE With power
M109 at elevations over +65 degrees, switch ON, move gunner's control left
the howitzer will hang out of battery and then right but without "palming"
1-5/8 to 2-1/4-in. This is normal and the magnetic brake. If this makes the
nothing to worry about. The howitzer cab rotate, the handle is not working
will return to battery as it is depressed right. Tell your mechanic.
to the loading position.
to the loading position. (NOTE: In normal operation never let go of
this palm brake control until you have fin-
ARE shed elevating or traversing and the handle
rOU CERTAIN is back in a neutral position. If you let go of
IT'S ALL the palm broke control with the handle at a
FIRE AT WHY slanl it could damage the brake control.)
NITROGEN PRESSURE (MI091-Check
the main accumulator nitrogen pre-
RECUPERATOR (M109) Check pins on charge pressure the way it says on page
inside recuperator the way it says in 393 of TM 9-2350-217-20. If pre-charged
your LO on page 18 and add hydraulic pressure is less than 500 PSI or more
fluid as needed. (This is a daily before- than 550 PSI, tell your support main-
firing service.) tenance.
I -rll .-Check mountings and con
sections on both portable and driver's I
Control panels Ask your mechanic to
repair or replace as necessary any parts
That are broken or defective. Keep the
portable panel inside the vehicle when
the gun is being fired. .r-#. __
1. Water temperature NORMAL READINGS 5. Battery-Generator -
170 (225 maxi- In green (charging)
III II 'I:I
,,I =l' IW ,', ,'"''
111. .. h ... ..
I .1 I .. .
stop enqgfie and Ic
rheuk oil levelI I
4. Transmission oil press
3 Transmission oil tem sure 5-40 PSI (mini-
perature 220-275 mum 10 PSI at 1,000
(maximum 300). RPM)
,, I I, ,
t U,4l, :.
CO D WEATHER I i The diesel engine on your M108/M109 needs
a high idle rate, 'specially in cold weather. For normal operation idle
for 5 minutes at 1,000 RPM when starting. During cold weather when
idling for periods over 10 minutes, set the idle at 1200-1600. When
it's not cold, and you idle for periods over 10 minutes, adjust to
.1 --,;j [Ei, --Before you start
make sure all radios and night lighting
systems are turned OFF. Some radio
tubes and night lights have been blown
off because they were left ON So
now you know.
ACCELERATOR PEDAL -If you're not
getting enough power, no need to panic
and pull the power pack. First check the
accelerator pedal. If it is bent you won't
be able to push it all the way down so
you won't get full power.
i lPItJ; CONTROLS-With steering
wheel centered vehicle should not wan-
der or pull to one side. Steering re-
sponse should be uniform throughout
entire range of wheel.
See PS 196 for Part II of the M108-
109 story. It will cover ..
SSLINGS AND THINGS
i CANNON CARE
FOR YOUR MECHANIC
.I.'.I SIGNALS-You can make like
an Indian and get the news from smoke
signals. If your engine does not smoke
at all that's good.
Black or gray smoke -- A lot of black or
gray smoke (an mean incompletely burned
fuel, too much fuel or irregular fuel dis-
Blue or black smoke Fuel or lube oil
not burned n cylinder
White smoke '*' .; grade of fuel, low
compression or misfiring cylinders
RESERVE POOP... TAP NO MORE
Seems like some guys are forever thinking of something to er ... drink.
Real bad around a self-propelled M107 gun or M110 howitzer when you're
establishing the oil reserve using the vehicle engine.
You know where it says in para 80b(3) of Ch 4 to TM 9-2300-216-10 that
you should tap the recuperator oil index lightly to see that it's working OK?
Well, they tap it alright like it was a keg of beer!
Result: a banged-up pin or internal injuries like sheared-off rack gear teeth.
Another M158 mount headed for depot, another M107 or M O10 out of action.
Real costly ... mission- and dollar-wise.
R ctNo, No, NO!
D TAP THAT OIL
Cross out the words in para 80b(3) and wipe 'em from your mind. The
word went out to all major commands in U. S. Army Weapons Command Msg
15349 (6 Jun 68).
If the oil index won't move out like it's supposed to, you leave it be and
tell your support guys to look into it.
THE 11-T'1' TO IT
Also, it seems that some guys're running into snags with the rest of the oil
reserve deal in para 80 of Ch 4, especially where is calls for using the electric-
driven hydraulic pump. This can get pretty tricky, y'know.
MAke sure the the oaiumuralor and the oil
BEFORE YOU p r""ur dumpmin shut off valve diona vov
S.START, CHECK Ivlve s closed, (if your rig ho ic dosed.
THESE one) n open
USING THE ELECTRIC PUMP
However, if the index pin won't move out, it means the nitrogen pressure in
the recuperator is over 2400 PSI, and you've got to use the electric pump to get
more oil pressure in there. First thing to do is to recruit a buddy to man the
pump switch for you. Station him up on the left side of the deck.
Just switching the pump ON will do it for the 8-in howitzer 'cause it has a
lower pressure requirement in its recuperator, but you'll definitely have to use
the pump's OVERRIDE for the 175-MM gun.
HEADS UP, MEN!
This is where it gets real tricky, so make sure you and your buddy are at your
sharpest. Ready? OK.
On the M107 Only (Using the ON switch):
1 Make sure the ,. -,., .,iI t-- Leon over aund eagle-eye the index pin.
valve control handle I Tell your buddy to put the pump switch
is still on ON when you yell "Go" and to turn it
RETURN OFF when you say "Stop. You start count-
(i ing from the instant the pin starts to move
and until the pin stops. Then keep count-
"ing twice that much more before you say
9l II- y '" '...y' i 11 Ir i i l
ON THE M107 (USING THE OVERRIDE):
0 o I --C-CAN'T
gi /-THE PIN!
Natch, if the ON switch doesn't budge the pin on the M107, you use the
You go through exactly the same deal on counting between "Go" and "Stop."
Only difference is your buddy puts his finger on-keeps it on-the OVER-
RIDE instead of flipping the switch. This OVERRIDE's spring-loaded and re-
quires steady pressing.
This should establish your oil reserve. Now your buddy can let the pump
switch return to the OFF position, and you can put the retracting control-valve
handle in NORMAL & HOLD, turn off the PTO switch and shut the engine
Remember this, though, if the index pin fails to come out at all, don't fuss
around with it. Get your DS people on it quick.
TIPS TO SECTION CHIEFS
That index pin will stay out as long as the oil reserve's up to snuff. Check it
daily and especially before and during firing.
Incidentally, you'd be smart to keep an eye on the recoil lengths when firing.
Para 37.1 in Ch 4 has a chart that'll guide you on this.
And notch this in your crew's headgear: Any time your cannon fails to return
to battery or the index pin won't budge (without tapping, natch!) is the right
time to whistle for DS.
Mids isT a sledlct r ofa recent pubs
A of Mene tl oergaiictloei meine-
_o a nce r pononnae. fTe 1i compiled
from rCenrd AG Dhiribution CenteR
Bffet ns. For complex details see DA
Pa. 310-4 (May 68), 7M'Ws, 1TB' etc.
DA Pam 310,6 (Jo 68), SC's and SM'W
DA Pam 310-7 (Apr d6), MWO'Yt
TM 1-OVI-S, C3,No-a OV-1.
TM -10-H-23C-24P, C2, Nov. OH-23.
TM 3-1040-241-12, Sep, 50 CFM Recip
Compresor 3.000 PSI M6-.IL
TM 5-1310-243-10, Sp. 40-MM
Carlridge Tod CS XM651E1.
TM 3-1310-244-10, Sep. 40-MM
Cartridge RIot Control CS XM674 and
40-MM Cartridge Red Smoke IS
TM 3-1325-232-12, Sap, El 58R2
Canister OCster Tact CS 50-l.
TM 3-1345-205-10, Sep. Anli-
personnel Mine PWP POP-UP XM54.
TM 5-2410-200-20, C2, Oct. Med
TM 5-2410-231-25, Sep. Cat D5 Med
TM 5-3210-200-20P, Sep. Saw Mills.
TM 5-3431-205-15, Jl. Arc Welding
Mah GED 300 Amp DC.
TM 5-3610-223-20P, Sp, Offset
Plateomker and Copier.
TM 5-3610-231-13, Sp. Color Press
Townsend Indus Mdl T-51W.
TM 5-4120-234-20P, Sep. 36,000 BTU
Air Conditionr Redmanson Mdl
TM 5-4120-2I-25P, Sep. 60.000 BTU
TM 5-4310-275-15, J1, Under 5 CFM
TM 9-1000-205-12, C3, Oct, M40Al
106-MM Recoilless Rifle on M79 Mt.
TM 9-1015-223-12, C3, Oct. M67
90-MM ecoilless Rifle.
TM 9-1015-234.12, C4, Oct, XM102
105-MM Towed Howlzer.
TM 9-1025-200-12, C4, Oct, M114AI
155-MM Towed Howitzer M 123A1
155-MM Aux Propelled Howitzer.
TM 9-1430-511-12/1, Sep, Hawk.
TM 9-1440-517-12, Sap, Hawk.
TM 9-1450-555-20P, Aug. XM 730
Guided Missilo Equip Carrier.
TM 9-2300-224-20/2/1, CS, Oct,
TM 9-2320-206-20P, CT, Oct. M123
Trctlor Truck M125 Cargo Truck
TM 9-2320-209-10, C5. Oct. 0742
Seris. 2% Ton Truck.
TM 9-2320-223-25P, C2, Sep. MI16
TM 9-2330-246-14, Sep. XM555 Van
Electronic 6-Ton 2 Wheel.
TM 9-3004, CS, Oct, M 15 Howitzer
TM 9-3062, C2, Oct, MI8AI 57-MM
TM 10-1670-205-13, Ct, Oct. Aerial
TM 10-1670-219-23, Cl, Oct, Aerial
Deliv Equip Per Parachute.
TM 10-1670-224-23, C3, Oct Aerial
Deliv Equip Per Parachute.
TM 10-1670-225-23, C3, Oct, Aerial
Deliv Equip Pers Parachute.
TM 11-5840-262-20P, Oct. OV-1A,
TM 11-6780-204-20, Sep. K5-6(1)
Still Picture Camera Sat, LM 17(1)
TM 55-1510-204-20P, C2, Oct, OV-1.
TM 55-1510-209-20P, Cl, Oct, CH-47.
TM 55-1520-203-20, C9, Nov, CH-37.
TM 55-1520-209-20-1, C2, Sep.
TM 55-1520-209-20-1, C3, Oct,
TM 55-1520-209-20-1, C4, Non,
LO 5-2410-231-12-1 and -2, Sep, Cat
D-5 Med Tracked Troctors.
LO 5-320-210-12/1 and /2, Aug,
75-Ton Washing and Screening Unit.
LO 5-4310-275-12, Oct, Under 5 CFM
10 5-4310-278-12, Saep, 60 CPM
Rotary Air Compressor Froam Mtd 2
Wheel Gas Engine 6.5 PSI.
LO 5-4320-243-12, Sep. Pump Centri-
fugal Petroleum Pipeline GED Skid Mtd
500/1400 GPM Reiner GP 110-5.
LO 5-4610-205-12, Sep. 3,000 GPH
Water Purification Unit Met-Pro
LO 5-6115-454-12, Aug, J125 100
KW 60 Hz Engine Drien Gen Sets.
LO 9-1010-207-12, Aug.9, MS Arma-
ment Subsystem Helicopter 40-MM
DA Cir 40-52, Ot, Prevention ol Cold
FM 9-16, Sep, Explosive Ord Recon.
FM 10-67, Oct, Petroleum Supply in
Theaters oa Operations.
MWO 9-1000-252-30, Oct, M6, M16
and M21 Armanment Subsystems.
S& 8-100, Oct, Med Dept. Expendable
SC 6675-97-CL-E07, Sep. Drafting,
TB 10-1670-213-20/1, Cl, Oct, Aerial
Deliv Equip Per Parachute.
TI 10-1670-240-20/1, Cl, Oct, Aerial
TB 55-1500-206-20/10, C4, Nov,
Have you included the latest stock
number for the shoulder strap of the
IM-174/PD and AN/PDR-39 radiac-
The new FSN is 6665-646-9404. Use
this in place of the deleted stock num-
bers, FSN 5340-823-5311 (webbing
strap) for the IM-174 and FSN 6930-
408-4313 (carrying strap) for the
Don't sweat it if you see the old stock
numbers still in the old pubs. They are
being changed to pick up this info.
0 EVERYONE IN THE
E 0, OUFIT WANT TO GO
OUT ON A MISSION WITH
SMITTY-OR AT ANY RATE,THEY
ALWA)'S FEEL BETTER WHEN
WH11Y HE KNOWS
? WHAT HE'S
AHA, THAT'S MAN, THAT'S OK, SO LEARN,
JUST CAUSE HE'S JUST THE POINT WHAT'S THE BABY
GOT EXPERIENCE... IN THIS SECRET LEARN.
ANP ANYONE BUSINESS THE INGREDIENT?
CAN GET THAT TRICK IS TO
IF HE'S AROUND BE AROUND
LONG ENOUGH. ... PIG?
50, TELL IT, Fa ..AND RIGHT AWAY LIKE HE
LIkE IT wElL MAKES MISTAKES, LIKE HE STICKS
WAS... / SnITT i B. Y THE PM SCHEDULE HE LEARNED
SHOWD BACK AT SCHOOL...
GREEN WE GOT CREATE!
AS MY PIECE JAMMEP
GRASS! ON ME.!
Y ^ ~ LOOKS LI1E
ITHE LIE YOJ BEFNHO
USIN' CAME OUTA
A GRAVEL PIT
BUT, I'VE NOT ENOUGH
BEEN LUBING OUT HERE...THE
IT JUST LIKE HOT, BUGGY,
I PIP IT BACK PUSTy CONDITIONS
rIN THE REQUIRE MORE
STATE/ LURE MORE
, RIGHT THERE
SMITTYf GOT THE
5O, NIGHTS...OR DURING HANG-UPS,
SMITTY SPENT TIME WITH THETM'SOR FMs...
i ,A ._
I I LOA
LIKE... HE'P REAP AND STUPY
STHE TROUBLE- SHOOTING TABLES
LIKE THEY WERE THE
GOOP BOOK /
BEFORE LONG HE BEGAN TO DEvELOP
SORTA 51rH 5ENSE ABOUT MALFUNCTIONS...
LIKE HE KNEW BY' HEART
S THiU THIS .Ay
PIG THE PS
A NPFIN-U P.'
F Be a "Big Gunt" ir your
outfit-get to know
What is wrong when your
equipment won't qgo!
Jhe mant who Ls smart
knows h s ol' TSckar t.
Read. your TM-avoid lots woe!
TROUBLE SHOOTS CHART
Sinl- iI ill|Sr. ......
a.- I I; **.....
Iir.15 -e 5 1.1
rm ; 9 j rea g ......-..
B;rn u.r ;run
WHAT To po ABouT r! I
IF YOU WANT TO DISPLAY THIS CENTERPIECE ON YOUR BULLETIN BOARD, OPEN STAPLES, UFT IT OUT AND PIN IT UP.
r- SMALL ARMS
Pl** la i` poIm.'b
Riau; ulry Ia j 111
Raw.BC ipii -Tli
Iq rpl IID
Id nc~m SAL
iml an -C ia t
Id ecl-Sir uL
*I me. -
,'..r ir.i. .. ..
F 1 lyre Lr1 n i .
Pailnj lnI d
STHEN, SMITTY HE LEARNED THAT MAINTENANCE I
- LEARNED SOMETHING IN THE FIELD 15 AFFECTED BY
EE CONDITIONS... LIKE UP IN THE HILLS
LW )T WHERE THE AIR WAS DRY-TEMPERATURE
S-- COOL...AND VERY PUSTY.
t / HEY, SARGE, WHAT'S SOP HERE
THE LUSE SCENE IS A LIGHT
LIP HERE!! LUBE APPLIED
THIN AND OFTEN...
INTO LUBE AND
50 WE GOTTA BE
BE E\TRA CAREFUL
IT'S NONE OF YEAH... MAN, YOU SEEN USIN'
THESE... SMITTY! PIRTY AMMO... CGT US A CLOTH
ANP WE'LL CLEAN OFF THE
ROUNDS 'N' THE CLIP!!
NAH...JUSt PLAIN COMMON G IN
7ENIUS! SENSE ANP KNOW-HOW! WE FLUSHEPCHARLIE
A, r .. a ON -- I/
'/ ...EITHER THE SEARS
BAPL BUSTEP OR THE SFAR
NOTCH ON THE OPERATING
ROP 1S BACLY WORN POWN'
L VI B~f ... GRABE LET'S NOPE.. FIRST OF ALL WE PON'T
Y'SELF ANOTHER WEAPON. FIX HAVE THE TOOLS... SECOND, WE
IT... WE PONt HAVE THE TRAINING FOR
GOT SOME. THIS FIX... LET THE ARMORER
TIME BEFORE .. OR SUPPORT FIX IT...
THEY COME BACK.
I DON'T KNOW WHY...BUT,
EVER SINCE SMITTY HIT THI5
. OLFIT... WEVE BEEN HAVING
A REGULAR EPIDEMIC OF
TM READING AT SACK TIME.
Don't sweat the likes of an ol' switch-
eroo when you request a vehicle light
switch. You just install what you get
and make sure you know how it works.
There're two versions of the light
switch used in tactical and combat vehi-
cles, and you may get either one under
Yes, they look the same, and both
must be unlocked to go to STOP
But, you'll find this difference.
On oe swtch -ou'e Onthe therswic, o
1 UNLOC SWITCH
3AS IN _
M151 WHEEL BEARINGS-
Yoursoft-purrin'MI5 11 /4- Matter of fact, you can de-
ton truck can suddenly turn velop a severe case of the
FOLLOW into a howling monster if PM jumpin' jitters yourself from
THIS ADVICE on wheel bearings and ball the front-end noises. And the
AND YOU CAN joints is neglected. pity is.... no need for it all.
PROEA L G WHEEL BEARING ADJUSTMENT
SAt this point, you better haul out your TM 9-2320-218-20. Grob this PM plan:
1. When you're seating bearings, Igliir, hi i
flonge nut to30 bs-fttorque. C ir, in i.gl
or shake the wheel. l =
Wheel bearings out of ad-
justment or ball joints on the
loose can let out some mighty
bewailing cries. When they do,
it's time you halt operations.
Grip your tire
and "feel" for
Clicking and docking indicate a fault.
NOW, TO YOUR BALL JOINT
If you still get the trumped-up treat-
ment, it's gotta be a loose ball joint.
Your -20 TM, para 141, tells you
that if there's more than the allowable
1/8-in play in the lower ball joint,
replace it. You'll have to measure with
calipers twice to get the true picture.
First with weight on the wheel and"
then with weight off the wheel. The
difference should never be more than
the allowable play.
2. Turn the wheel
o few times to
make sure the
hearings ore snug.
3. Then, you back
off the flange nut
until it's loose.
Now, tighten with
/ IF YOU DON'T RATE CALIPERS
LIKE IN TOOL KIT SET B FOR
(G858-SERIES) Y4-TON TRUCKS...
DON'T SWEAT. HERE'S A SIMPLE
TOOL YOU CAN MAKE!
washer and wing nut.
wing nut so
First, you can bet your jangled nerves the
wheel bearings were adjusted too tight or
too loose. A quickie check is easy.
a MW 'A
QUIT WRECKING YOUR WRECKER...
SNAP OUT OF ITN
You're a ClosLr if \ou and your 5-ton
%xr-ckcr hir rhe road %ith a swingin'
l ", ..I' YOU'VE GOT
l j, ,,f BENT PROPELLER
T' %C-u JiNL E5E A
ANP IT'5 Pr PLAN
LIKE TH15.' --
4 Move the hydrauloi pump
control level to DISENGAGE,
the clutch control lever to
ENGAGE, and lhe power
divider lever to DISENGAGE.
A AMlD HERE'S
3 Attach the i ; sling to
the cable hook and to the
front outrigger frome tube
eyes Raise the cable hook
to remove oil slack from
Secured S Stabilized (Controlled
boom. drive train. vehicle.
S// F' M __
OK, you're in if chains and cans are
clanging all around your vehicle when
you're "just married': or if it's New
But, man, you're out when you don't
have tailgate chain covers on your cargo
trucks. Unnecessary noise can make you
a real goner.
So, get into the right swing of things. HAIN
You get Duck, cotton, FSN 8305-
170-4956, and have your support make
chain covers that'll muffle that rattle.
STOP STARTER TROUBLE
It's forgotten more than it should be ... and that's too bad
because checking the mounting bolts for your engine's starter
is good PM.
If the bolts come loose, you'll get trouble-the kind you
get when the gears get out of alinement. That is, jamming
or hanging up of the gears.
MWO FOR 4-TONNERS
Make sure your support gives you a break-a dependable parking brake, that
is. They'll apply MWO 9-2320-218-30/6 (Jun 68) to your M151A1, M151A1C
or M718 with the over-center-type hand brake lever. Then, when you tip up
the driver's seat, you won't accidentally release the brake.
WHAT I WROTE...
"PEAR HALF MAST,
OUR M149 WATER
KNOW A FIXF?
^^^H I Vja
--~ M149 WATER-TANK
You use all the standard mount parts except the 4 mounting bolts and lock
washers. Toss them out.
Here's the fix:
If you ever have to take the fix off, use fresh loctite on bolt threads. But even
a Chu Lai trail in dry weather shouldn't budge 'em otherwise.
10AN 8331543), "i
then qwor (P/N 11597761) ever
lower mW IP/N 13315")"-
whA jees'under the frwe kradef
AY... THERE E'S
hy A TOOL
Dear HalfMast \o"
Can you tell me why Ch 1 (Aug 67) to SC 4910-95-CL-A72 took the Adjusting Tool,
Valve Tappet, and the Caliper, Slide Diameter Cross Section, out of the Automotive
Maintenance No. 2 Common Tool Set?
According to the TM's, we need those tools for adjusting valve clearance on certain
engines and for matching tires.
SSG C. E. M.
Dear Sergeant C. E. M.,
When you've got a screwdriver and SCREW
the right-size box end wrench already DRIVER
among your tools, you don't need that
special tool for adjusting valve clear-
ance. The screwdriver-wrench method FEER
is just as easy and saves you from hav- GAGE WRENCH
ing to keep track of a special tool.
And on that tire diameter measuring
TAPE caliper, it's been decided that measur-
\ MEASURE ing the tire circumference is good
S*enough for matching tires by size.
) You've got Tape, Measuring, FSN
S5210-221-1875, in your No. 2 Com-
Smon Tool Set. Para 27 (Matching Tires)
in TM 9-1870-1 (Feb 55) tells you how.
HOT POTATO RUMOR
I got word of a change: No more national markings on tactical vehicles in an over-
seas area. Is this correct? wO P. J. M.
Dear Mr. P. J. M.,
No ... drop that idea like a hot potato, Sir. AR 746-5 clearly says the national
symbol will be marked on all tactical and combat vehicles. Only for security, a
commander of a major Army command may remove markings.
Sure, you turn the roll control knob in either direction to get a 45-degree
bank. But if you don't get exactly the same bank in each direction never use
muscle to force the knob past the mechanical stop.
Using force grinds one gear against another and before you know it the gears
strip, the knob turns 360-degrees and you lose the detent to center the knob.
Your autopilot is out-of-whack.
Fact is, it's just about impossible to equalize your turns. This is no real
Now, suppose you engage the autopilot while you're in a turn. Then you level
off and wind up with a wing low, despite the fact that you've got the roll trim
control turned all the way to the maximum. Using muscle here won't help either
. .. more busted equipment! !
Instead, leave the trim where it is.
Disengage the autopilot.
IT Rotate the trim to the
THIS maximum in the opposite
WAY! direction which will give you
additional trim control.
Then engage the autopilot and turn the
trim in the original direction to bring the
The behavior of the flight controller in these instances is normal-no log
book write-up needed saves beaucoup trouble-shooting time and elbow
grease by your friendly avionics repairmen.
Ever set your bird down on an un-
improved strip? Sure you have! It's at
times like this, without your tools and
maintenance facilities, that a fly-away
kit comes in mighty handy.
For one, those pierced steel plank
corrugated landing mats play hob on
tires. You're rolling along and-pow!
One tire change coming up.
You can pull off the runway and
change that tire in a matter of minutes
with a kit containing items like this: a
spare main gear tire, nose gear tire,
10-ton jack, small bag of cotter keys,
screwdriver, pliers, miscellaneous
wrenches and hardware.
J ...wa .
Don't overlook including a couple of cans of MIL-L-7808 and MIL-H-5606,
The baggage compartment in the Able Model makes a good storage place
for the kit.
One point, tho. Remember that Chap 13 of TM 55-1510-204-10 says that this
compartment is designed for a maximum weight of 40 pounds.
I11"'. !' MECHANICS
It's first-things-first when your
bird comes in to roost after a mission.
SUse the bird covers.
Nearby Chinooks and other choppers
can stir up quite a dust storm so protect
the engine from FOD by putting in the
engine duct plugs. When you pull your
after-mission check make sure you
eye the bird for battle damage.
When you locate a bullet hole never
,take it for granted that it went clear
thru without damaging any vital parts.
Al .11p~ ~~ t I f .11 1- 4.~P
emem cr a, LI~LLIC U C.C
flected from a straight path as it hits
the airframe and equipment... I FOUND
Search the bullet path so you can get I
all the damaged parts repaired or re-
placed. It would be mighty embarrass-
ing if a creased fuel, oil or hydraulic
line let loose in flight! !
After you finish a repair job be sure
you police up the area. Tools left be-
hind will tear up an engine, for real.
Speaking of tools-you know those -
engine starter-generator and deicer gen-
erator self-locking nuts that are hard
to get at with an ordinary wrench? You can't loosen the two hidden nuts on a
generator change without using special wrench, P/N 134GT1065.
If there aren't enough wrenches to
FABRICATE go around, make one up. Just latch on
HANDLE to a salvaged 9/16-inch box wrench
and grind it down to a thickness of
SWELD HERE 1/8-inch. Weld on a handle shaped like
the issued tool and you're in business.
Before your baby is released for
; flight give 'er the once-over for clean-
liness. If you're stationed close to salt
I water remember that corrosion sets in
WREINDOWN A SALVAGED mighty fast around rivets and seams,
BOX WRENCH TO IN. THICK. especially on ailerons and other control
Never let oil and dirt collect because this is the breeding ground for corro-
sion. Try to wash your bird at least once a week.
When corrosion develops follow the poop in Sect II Chap 2 of TM 55-405-3
(12 Jul 66) for treatment.
.k\7 fe I J1.
Keeping your bird clean will also extend the life of bird parts.
Take the exposed landing gear pistons. Tar and dirt are thrown up by the
wheels on some of those boonie strip take-offs.
Upon landing the struts '.ompress and this stuff cuts into the hydraulic
fluid seals ... you get more leaks that way!!
Clean stubborn dirt off these pistons by wiping them with a rag moistened in
hydraulic fluid, MIL-H-5606.
Now, stand back and eye your beauty.
Yessir-e-e-e, she's had her PM and is ready to do battle.
Reach for TB 55-1500-307-25 (7 Jul 68) when you birdmen check out the list
of parts that require maintenance management and historical poop on TM 38-
S750 forms. It takes the place of TB AVN 23-65.
No need for you Bird Dog (0-1) types to do a doubletake when you spot a
filter on the engine mags. It's there to cut down on radio interference from the
ignition system. TM 55-1510-202-20 will have the maintenance poop on this
11" _____ .-----------------------------,
NO GUESSING, PLEASE!
There's no need for you birdmen to use guesswork when tightening hard-
ware. Standard torque values are given in Table 5 of TM 55-405-2 (11 Jul 66)
on aircraft hardware. Special torque values are given right in the text of each
bird's maintenance pub.
LET'S KEEP THE RECORD STRAIGHT
STake'a bow, man, if your bird is up-to-snuff MWO-wise.
To make sure your log book, DA Form 2408-5, agrees with the poop at the
Aviation Systems Command, tho, better eye the EIR and Maintenance Digest
regularly for any MWO that wasn't applied ... or was it ? ?
Like maybe you got it done OK, but the completion info was lost in the shuffle
and never got back to the headshed.
So, if the serial number of your bird appears in the EIR Digest as being delin-
quent and the mod was done more than 4 months prior to the date of the Digest,
here's what you should do:
Dig up your file copy of the DA Form 2407 that shows the mod was done.
Duplicate this info on a new DA Form 2407, copy number 2, and send it to
your Command's Data Processing Center.
If you can't locate the original maintenance request, take this route:
Fill out another DA Form 2407, using the mod completion info from the
DA Form 2408-5. Use failure code 797 ... No defect-MWO previously com-
plied with. Send copy number 2 to Your Command's Data Processing Center (or
to Lexington if there's no DPC).
BY THE NUMBERS...
S/ SAY' THAT
E F -- 1r -I
l .. N
Hold one--before you write the serial number for your bird on a log book
form. Make sure you've got it right.
What happens when the bird tail number, which is only part of the serial num-
ber, gets on a TAERS form? Plenty!
The wrong number gets transferred from a log book form for machine proc-
essing. Then when the poop arrives at a data center the computer accepts the
bogus number. With that number, the machine "creates" a non-existent
To prevent the loss of good poop, make sure you use the serial number that
appears on the bird data plate.
So, right now, while you've got a few minutes, check over all the forms in
your bird's log book. Be sure serial numbers-not tail numbers-are in the
serial number blocks. Prevent trouble when you fill out aircraft reporting
forms in the future.
CARRY TIME FORWARD
Just to keep the records straight, is test flight time counted as port of a just-com-
pleted periodic inspection?
My buddy says it is, but I sa) the fight time is applied toward the next 100-hr PE.
le ARE SP6 S.
Dear Specialist D. S., YOU RIGHT, P.SR
TB 55-1500-301-25 (23 Oct para 4c(l) on maintenance inspections says
that periodic are normally due every 100 flying hours after completion of the
TB AVN 23-16 (28 Feb 66) on test flights lists the conditions under which a
test flight is required. Para 4a(1)(j) calls for a test flight after a periodic inspec-
tion has been completed.
lCA' LOSE THOSE
; BATTERY BLUES
Whaddaya do if your AN/APM-156 You should test the batteries one at a
test set for the AN/APX-44 transpon- time, using the 2.5-volt range 1000-
der set goes on the fritz? ohms-per-volt scale of a TS-352B/U
Why, you turn it over to support for multimeter. A good battery will read
fixin'-but before you do ... above 1.1 volts at no load. Batteries
Make sure-real sure-that your having less than 1.1 volts should be
test set hasn't been downtimed by the recharged at 200 milliamperes for 16
battery blues, hours, then retested to have a minimum
Y'see, weak or dead battery cells can of 1.25 volts at no load.
cause most of the common complaints Batteries having an output of less
such as erratic flags, inability to hold a than 1.25 volts after recharge should
charge, no IP and EMERG flags, and so be discarded and replaced with fresh
Trouble is, some of your battery In putting back your batteries, dou-
kinks may not show up on the battery ble-check their polarity as marked on
voltage meter. +
So-o-o-o- whaddaya do then ... ?
You test .. yeah, that's right .
you test the batteries before the AN/ \ INSERT BATTERIES WI
APM-156 heads out for higher-level +OR-TERMINAL AAIN
repairs. E IS SURFACE AS INDICA
repairs. SURE MODE
Here's how: SWITCH IS AT OFF
BEFORE YOU TEST!
TaI e 4 s f the battery holder. If polarity is re-
S versed, the batteries can be shorted out
and knock out your tester.
To get new batteries, use FSN 6140-
986-0341 as listed on Page 3 of TM
11-6625-509-20P (May 63).
By making this battery check. you
can probably eliminate most of .uur
transponder roster's dom. ntimc and
alo present possible damage to our
^ testing set while in transir for fi\in
S -.; I .. ," '
.' "b __ .. .... "
EASY ON THESE /I Best to take it smooth ... and easy...
CNthere when you position the re-
Better be on your best behavior when ceiver-transmitter in its case.
you put back your AN/ARC-131 radio If you don't, you could harvest a
set's RT-823 receiver-transmitter into crop of damaged connector pins, too-
its case. and louse up the incoming power to
Never use force as you replace the your set.
RT, especially since almost any kind of Since it's re-installing the RT that
heavyhanding could plague you with racks up troubles, be sure you take it
bent alinement pins. from the case only when you have to.
AW, IT'S JUST A
LITTLE PIECE OF WHY SNAP YOUR CAP?
THAT HAN65 Doesn't look like much to get excited about- but,
AROUNV listen, man ..
SSome people put in one heckuva lot of time and
Effort to get those chains fastened onto dust caps,
connector shorting caps, mounting bolts, and quite a
Sfew other things on your electronic equipment.
They meant the chains for a pretty important pur-
pose... to keep that cap or bolt or cover right with
S its equipment. 'Cause, y'see, when the cap's on, dust
Can't get in and ruin your equipment. That little
So-o-o-o, if your bead-chain catches on something
and snaps ... get it replaced. If your cap snaps from
its chain ... get it replaced.
BEAD And in taking off the cover, please stress that
N tender touch.
Why, you might never snap your cap!
THE AN/GRC-106 RADIO SET...
That AM-3349 power amplifier on
your AN/GRC-106 can carry a power-
ful load but it could bog down, may-
be at an embarrassing time, if it's not
operated properly tuned.
Yessir, unless you tune it right,
you're mighty liable to get hit with
failures of the C-22 plate trimmer ca-
pacitor. And conk-outs like that can
put the Angry-106 on downtime, when
it really oughtn't to be.
But make no mistake .. failure of
the AM-3349 power amplifier is not
restricted to just the Angry-106. If the
AM-3349 is not treated right and tuned
right, it can flunk out in such configura-
tions as the AN/VSC-2, AN/GRC-142,
and the AN/GRC-122.
So-o-o-o, it's a good idea to be espe-
cially careful when you synchronize
the LOAD and TUNE dials.
YA RECLL T u rNE?)
When you change frequencies on the RT-662 receiver-transmitter, you've got
to return the LOAD and TUNE meters on the AM-3349 to the center position.
If you relocate your radio set, re-check the LOAD and TUNE meters. Re-
center the needles if necessary.
This'll ease your mind-and also lengthen the life span of the tuning capacitor.
The tuning procedure in para 24, TM 11-5820-520-12, has been changed to
indicate that you should immediately tune the ANT LOAD and ANT TUNE con-
trols after setting the HV RESET switch at TUNE and before taking readings
h with the TEST METER.
While you're eyeballing both associated meters, you should practice tuning
the ANT TUNE and ANT LOAD at the same time-left hand on the ANT
TUNE knob and right hand on the ANT LOAD knob.
This will increase your proficiency and shorten the tuning time.
To make sure you're tuning right, you can:
Keep your antenna lead clean. '
Keep connectors free of dirt to insure a good elec-
trical connection. d"
Check RF cable for kinks or breaks.
When you're using the 50-ohm GRA-50 double
antenna, see that it's cut to the proper frequency.
ARE THE NEEDLES IN
THE CENTER POSITION?
Naturally. >ou made certain that the
TLiNE and LOAD meter needles were
in the center position (green portion
of the scale prior to turning the
OPERATE.TLiNE s itch.
Do not switch to OPERATE if the
needles are not centered on the scales
Before s"iaching the power ampli-
fier, turn the OPERATE-TUNE switch
If the double doesn't Itu
c ut to the right'
by I or 2 feet.
Whiil :; ;'rc on th'; siub
possible tu Irok the I
iirrl r //?l 0 DNM LIIN k
In operating your -106 (or other configurations), the rule is: Once you turn
on the primary power switch, keep it on. Turning the RT-662 SERVICE SELEC-
TOR to the OFF position removes power from the entire AN/GRC-106.
l,^|\\^W- -- \U P '
Chasin' rainbows is for the fairytale set as sending and
receiving freqs is for radio-types.
But, those free, flying freqs can have you thinking your
equipment is going to pot and needs a helping hand from the
maintenance man. Take, f'rinstance, your AN/TRC-24 or
AN/GRC-50 radio terminal set...
' I E.
Instead of coming up with a good, relaxing mo% ie for rhe
troops, you windup with smell-o-movie ....
'Cause not taking care of a projector like the AN/PFP- I
or AQ-2A(1) set can stir up a stink when.picture showing time
rolls around but the projector won't.
To make sure the show is put on the screen, here're a couple
or three tips that'll save the aspirin bottle:
When that projector is being stored, put it in its case or
under its cover, and stow it in a dean, dry place.
And, if you're where the wet is the wettest, turn on the
projector for about 5 minutes once a week, or more often, if
necessary. This'll let the projector lamp's heat keep down
moisture and fungus.
c APF TER THE
The R-417(*)/TRC receiver's
AFC select switch has to stay in
the on position until it has a good OFF
grip on the frequency beam.Then,
flick it to the off position.
Same's so for the AFC switch on the T-302(*)/TRC trans-
mitter ... on the wandering frequency ... So, when you latch
onto the frequency you want, hold it by leaving the switch
in the on position.
pl l.h ,.ijd pr. i.r', pL..II ii.l ., n ..ili il.
I f, rlu r. I ,. r, L I. ,I 1 I. I I. r.i ill
2Uu-l10 Uct b60, to whisk away film particles
which will gang up on the projector.
.^s p ^
0' course, you never wont to use water to
do the job of the lens cleaner.
When it comes to giving' spools, spindles
and rollers a squirt of oil don't.
Your best bet's to follow the guide in your
TM for lubing. Then, only after 100 hours of
operation or every 30 days. Be sure to wipe
away any extra that'll catch dust.
fi,,lh. r qI, j,, btlca ,: t iiij pruij.].r i.
l, 1in III, l,:l. ird i fl. i.. r ..,lh lie I,. ..
I I, 1.-4.ll 3 1 ] 1( ) l I 1 h, ,l.I. ,I lob
calls for extra elbow grease, use a dab of I-
quid lens cleaner (FSN 7930-392-9751). Put
it on the lens tissue and not on the lens or
D W I
GENERAL MHE EMERGENCY STOP TWINKLE, TWINKLE THE Rs
SUPPORT FORE TH N's
STOP! T You do just that ifyou've Little stars and big stars. You can get in-between stars / FOR THE
STOP! You do just that if you've too for your equipment. IFFERENT
tripped the emergency stop on your SIZES OF
6,000-lb Anthony Model MLT 6 or OUR NATIONAL
Chrysler Model MLT 6CH forklift
Before you try to start 'er againMEREN
you'd better climb down and go back STOP
to the engine and reset the emergency RESET
stop reset lever. It should be at 6 o'clock LEVER
or pointing down when the stop's reset.
If you keep trying to start with that 4 4
emergency stop tripped, you could dam-
age the starter. Or, enough air could
be drawn through the air cut-off valve come to rest, the bendix will try to rc- You'll find these FSN s listed in Fed Cat C-ML-A (Aug 68).
in the blower air horn so that it'll fire engage. Result--damaged bendix, fly- TB 746-931, (Oct 64) para 11, f, gives you the authority
a cylinder causing the bendix starter wheel ring-gear or both. So, to head off to use em.
drive gear to throw out. busting up your equipment, check that
And, unless you take your thumb off lever before you touch the starter
of the starter button and let everything button. A SPIDER W EB
oo MATCH 'EM MALE /
Lbel I LOCK
Tm~!mM532 laundry unit, FSN 3510-782-on
hen ou assemble the bed. 3010-807-6623, Mfr Code 71041, Part
all the was i" the bottom of the female lock place slots. so along with the two parts of the cou-
don' ore to force 'em. TY AN pling. You can't find thi spider listed onre
SSUPPOSED TO page six of TM 10-3510-208-25P You can get untan
You'llfind gled if you're looking for a umbideniferion inlerrucons for le A THE (Dec 66).
your bunk bed indrive motor coupling spider for your
There's a manufacturer's name. traid name, d M532 laundry unit, FSN 3510-782-
on the spring ind the bed end 5294. Order Coupling Assembly, FSN
vvhcn Ncou assernble the bed. 3010-807-6623, Mfr Code 71041, Part
\\.,tch this. tho:! The male lock lugs 3r No. FC-BB-15, and you'll get the spider
all rhe' a3 to chc bottom .f t ie IwI~ plate slnj. u, along with the two parts of the cou-
don't (r) to I orce cm. Ipling. You find this spider listed on
SUPPOSED TO page six of TM 10-3510-208-25P
You'll find the asrri'mbl and identification instructions for LOCKGO ALL THE 66).
your bunk bed in TB "iO.9' I I Feb 68i. EIR Digest. \ WAY DOWN!
NEW PB PAGE
Change I (May 68), AR 735-35 gives us a new property book page, DA Form 3328,
which supersedes DA Form 14-110.
MSG E. L. S. / ..DOES THAT MEAN
WE GOTTA REMAKE ALL
THE OLD PAGE ON
THE NEW FORM
otherwise, you cn ue DA Form
book, or as your DA Form 14-110's --
ORGANIZATION ORNSTALLA10N) PROEY RECOIII
DATE DOCUMENT RECEE TURNL
LA NUMBER N' BALANCE
Dear Sergeant E. L. S
Unless your local command says
otherwise, you can use DA Form 3328 -- -
as new pages are added to the property / NEG6TlE.'
book, or as your DA Form 14-110's
wear out. -
Meantime, all you do to an old form -
is change its face a bit, so it'll read like
the new form.With ink, change the tech-
nical service block to read UIC, add i
initials over last column, add of issue
to unit block, and change the COA
block to read "MODIFIED ALLOW-
ANCE" line out form info at the top of
the page and write in the new number.
.~ TOTAL LW T IOTA IlAr sM.
And, since the old pages will go in uic V e
your inactive file (likeit says in AR 345- .".1 "TOC""N-M M O
215), you can use the balance brought "E" DSC"iPTION
forward note, along with the routine
in the AR's para 3-2h, when you make 1-a..
out a new DA Form 3328. -.
1 -4 -4 60
Other expendable items are accounted for like it says in para 3-2g (2)(3),
Deaf Hali-Mast, "'-
Wiat says I can't use a rubber stamp to make the "per inventory" and "per joint
inverioay" entries in he property book? Some inspectors gig stamp users.
SFC W. J. G.
Dear Sergeant W. J. G.,
Nothing says you can't. AR 735-35 C
doesn't tie you down to a specific meth- i
od. If stamps will save you work and
time, all you need is the-Old Man's OK
and the price of the stamps.
Remember on DA Form 2064
(document register), the "From" and
"To" blocks take their dates from the
form's column a. And, the dates simply
cover the period that the page was used
to initiate requests.
The requests' completion dates, on
the other hand, go in the form's col-
umn i. The "From" and "To" blocks,
therefore, can be filled long before .
some of the blanks in column i are
HOW'S YOUR FOLLOW-UP
Do you have to finger all the supply IN ERE
status cards when you're checking fol- SOME F
low-up dates on your requests? WHERE.
Well, eye this handy box and filing
system. It'll help you stack the status l
cards so the follow-up dates are easy to
You can make the box as long as you
need to. But, it should be 10 inches wide
and 2-1/4 inches high, and it should
have a smooth inside bottom.
A board, to fit the inside length of the
box, and 2-1/2 inches wide and 1/2
inch high, goes on each side on the in-
side bottom of the box.
Filing a request card on the left side -.
makes its upper left end angle up. And,
filing the latest status card on the re-
quest to the right side, makes its right '
upper end angle up, so its date column -
(blocks 62-64) is easy to check. And
using a paper clip in the center of each
request helps to keep the cards in their
T L PICK UP MAKE UP
WOT OUTFIT DUNNO..J\ TOOL POST IAR SEPARATE
YOU WITH? SA, C'N ON IAR IN DOCUMENT PROPERTY
I HANG REGISTER BOOK PAGE
AROUND FOR EACH
RATIONS '' 444 2 IAR ON
QUARTERS? EACH PAGE.
List the tools on the IAR and give
Dear Half-Mast, it a document number. Make up a
Some aircraft special tools in our shop
have never been picked up in our property separate property book page for each
book. What paper work is needed to get different type tool which is non-expend-
them in the book? able or expendable-reportable and post
CPT B. D. the IAR to each page.
The IAR needs the OK of the CO
Dear CPT B. D., the book is kept for, and a copy of the
In the absence of a supply document OK'd IAR goes in the document file.
on the tools, you can use a DA Form The document that gives you the
444, Inventory Adjustment Report, tools goes in the authorization block of
(IAR). the property book pages. /
SUPPLY HELP -. -
Planning a supply training session soon? Well, don't miss
the latest Army Subject Schedule on the subject. It's ASubjScd Do M
10-1 (Jun 68), Unit and Organizational Supply. ....
It lists the latest supply forms and identifies the pubs you'll
There's also DA Pam 350-21-1, Instructor's Guide, Unit ,..
and Organization Supply Procedures, and its companion
handbook for the student, DA Pam 350-21-2. .._ ...
With the Pams you can get a packet of transparencies
(slides) titled T38-11-1. They'll help you illustrate supply
SOP, channels, forms records and publications. See your Enammjasu
audio-visual center for the transparencies. mMM
And, be sure to check the pams and the slides with Ch 1 sOmYar ms
(May 68) to AR 735-35 to be sure you have the up-dated info
on supply forms and SOP.
So your TO&E allows you a Bruning
300MS map reproduction set, but it's
There are a couple ways out. In
CONUS, just have your support unit
phone the nearest Bruning office collect.
They'll send a tech rep to show you the
Across the pond, ask any MSO
HANDLE 'EM YOU INSULATE THAT?
EASY WHEN IT'S GONNA BE A
YIU MOVE!! ? ROUGH ROAD!
(Mobility Service Office) for Training
Course No. NET-66-35, with pictures
And remember you can't use that
machine without the expendable sup-
ply kit. You need LIN R-84552, Repro-
duction Expendable Supply Set, FSN
3610-889-3246 in SC 3610-93-CL-E18
COMES MOVING DAY
On moving day, map a break-
free way. Remember shocks and knocks
can break a box and your.Bruning
Don't let volunteer help put bare
hands or oily rags on those developer
rollers. Otherwise there'll be big black
spots in your next map.
If you're a man who reports unit readi-
ness on DA Form 2715, cast an eye on
Ch 1 (10 Oct 68) to AR 220-1, Unit
Readiness. It contains several Changes
to the AR, supersedes DA Msg 852346
(21 Feb 68), with readiness condition
(REDCON) points of special interest on
communications and missile items and
N16 PVi# poao
Can't memorize your M16A1 tech
manual, y'say? OK, get yourself a plas-
tic, wallet-sized card containing basic
dope on cleaning, lubing, ammo and
combat tips straight from TM 9-1005-
249-12. It's GTA 21-1-3 (Jul 68) and it
supersedes your card dated August
1967. Use it it can save your life!
Order 'em from the Baltimore pubs
How does your outfit order, control
and use its supplies? Good question.
Your unit will be in better shape if you
round up a copy of AR 700-87 (4 Sep
68), Supply Discipline. Be sure your sup-
ply business lines up with all the 21
questions on page 5.
Never pickle a pranged Huey T-53
engine if it failed or you believe it folded
up. Then the experts can find out "who
happen?" Treat the C model engine, for
example, according to the poop in TM
55-1520-220-20 (30 Jan 68) para
?Ise Word On "M0WO
Every maintenance man and com-
manding officer will want to read all
the new word on modification work
orders in AR 750-35 (20 Nov 68).
Logistics types such as S-4's, G-4's,
commanders and support outfit people
(military and civilian) will want to
read a new bi-monthly magazine, Army
Logistician. To get it regularly on pin-
point distribution, make it a write-in on
DA Form 12-4 and send the form to the
Baltimore Publications Center right now.
See DA Circular 310-72 (12 Nov 68) for
Would You Stake Your LifeA on
the Condition of Your Equiprnent?
Your clutch pedal's no foot- rest.
Keep your foot on the floor unless
you're using the clutch to shift gears.
NO CLUTCH RIDING!