STAT pLAN RD
United States Department of Agriculture
Agricultural Research Administration
Bureau of Entomology and Plant Quarantine
FERTILIZER SPREADER MODIFIED TO APPLY
By W. C. Fest and A. R. Whitcraft
Division of Fruit Insect Investigations
During the investigation of DDT for the control of larvae of the
Japanese beetle (Popillia japonica Newm.) in turf and in nursery plots,
it was found that the commercial fertilizer spreaders available did not
spread 10-percent DDT dust uniformly. The dust tended to become com-
pact and to "bridge-over" in the hopper. Most of this difficulty was over-
come by installing an agitator in the hopper, above the rotor bar at the
bottom of the hopper. The modification described herein for a 3-foot
commercial spreader of the type shown in figures 1 and 2 may be applied
to other spreaders of similar construction or to larger spreaders.
The following materials are required to alter a 3-foot spreader:
Annular ball bearings 1/2-inch wide, 7/8-inch bore, and
1 7/8 inches outside diameter
Felt washers, 3 inches in diameter, 7/8-inch hole
Shaft collars, 7/8-inch bore
ft. 7/8-inch shafting
15-tooth sprockets, 5/8-inch pitch, 7/8-inch bore
in. 5/8-inch pitch sprocket chain
5/8-inch pitch sprocket chain half links
Flat metal washers, 7/8-inch hole, 3 inches in diameter
Bushings, 7/8-inch bore, 1 7/8 inches in diameter, 3/4 inch
Bushings, 7/8-inch bore, 1 7/8 inches in diameter, 2 inches
long (not shown in figure)
ft. 5/16-inch rod
The cost of these materials in Philadelphia, Pa., in 1948 was about
The 3-foot spreader was modified in the following manner: The pins
in the spatter bar were removed, and the wheels and the rotor bar were
taken off the spreader. The rotor bar, to which the wheel was welded,
was cut off about 2 5/8 inches from the outside of the hub of the wheel.
Two annular bearings (fig. 1, A) were placed in the center partition of
the hopper and one in each end of the hopper. Felt washers (fig. 1, B)
and metal washers (fig. 1, H) were installed to keep dust from getting
into these bearings and to keep them lubricated. A bushing (J) 2 inches
long was placed in the hub of the wheel and secured by a 1/4-inch pin,
which went completely through the bushing and the 7/8-inch shaft (fig. 2,
D). The 7/8-inch shaft replaced the rotor bar and extended from the out-
side of the hub of each wheel to the center of the partition in the hopper.
On one side of the spreader a sprocket (fig. 2, E) was secured to the
shaft by a pin, which passed through the hub of the sprocket and the shaft.
The other sprocket was mounted on the end of the agitator shaft. On the
agitator shaft in each compartment of the hopper, two 5/16-inch rods
(fig. 1, K) were fastened by drilling holes and securing the rods in place
by nuts (fig. 1, L) on each side of the shaft. To install the agitator shaft,
a hole 7/8 inch in diameter was drilled in each end and in the center
partition of the hopper so that the distance from the center of the agitator
shaft to the center of the drive shaft was 4 inches.
The agitator axle and the rotor axles were held in position by 7/8-inch
shaft collars (fig. 1, C).
Three bushings (fig. 1, I) 3/4 inch long were mounted on each rotor
axle at each ring on the spatter bar. The outside diameter of these
bushings was the same as the inside diameter of the rings of the spatter
bar. The bushings for the spatter bar were secured to the axle and
spatter bar by drilling 1/4-inch holes through the spatter-bar rings,
bushings, and axle. The bushings for the wheels and spatter bar were
made from 1 15/16-inch steel shafting.
For spreaders larger than 3 feet in width it is advisable to use a
two-piece agitator shaft, driven from both wheels.
I, A-B-H C C A-B-H
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Figure 1. Interior of hopper of spreader.
Figure 2. Side view of spreader.
UNIVERSITY OF FLORIDA
3 1262 09242 9066II II
'I 3 1262 09242 9066