TM 5-3895-359-14&P
w. Install proper gaskets as selected by chart,
(Lubricate this ring with light oil or grease.)
Gear width greater (plus) or less (minus) than
Install the lapped seal cup with lapped surface
housing width. Install shim gaskets as indicated
up. Make sure rubber ring is seated in cup.
Make certain the rubber ring is not cut when
below.
placing it on the shaft and when passing it over
SHIM GASKETS SIZE CHART
the key slot.
o. Press the entire seat assembly down against the
Inner wear plate
Outer wear plate
spring compressing it. When released, the
Plus
0.002"
0.002"
0.002"
spring should return the seal cup to original
Plus
0.001"
0.001"
0.002"
position. If it sticks on the shaft, replace the oil
0.000"
0.001"
0.001"
seal assembly.
Minus 0.001"
---
0.001"
Minus 0.002"
---
---
over gears and on face of wear plate. If it is not
practical to use a micrometer to measure gears
and housing, use a gasket that measures 0.001"
thickness on both sides of gear housing.
x. Line up punch marks and place pump housing
over gears and gasket. Tap into position with
fibre hammer. Add selected gasket to face of
gear housing. Install wear plate (outer) with
bronzed surface against gears and relief hole 180
degrees from inner wear plate relief hole.
y. Install wear plate (outer) "O" ring seal and
install cover, lining up punch marks. Tap onto
FIGURE 17 Drive Shaft, Inner Wear Plate and Seal
housing assembly with fibre hammer.
Assembly being Installed in Adapter
z. Install four pump cap screws. With a torque
p.
Wipe off any foreign matter from seal seat.
Lubricate surfaces of steel seat and seal cup with
wrench, tighten gradually, opposite screws to 60
light oil.
ft. lbs. torque. Be sure original cap screws or
exact replacement are used. Use washers, if
q.
Turn the entire drive shaft assembly over and
used originally. Seating of washers or cap screw
install it in adapter as shown in Figure 17. Use a
composition (fibre or plastic) hammer to drive
head shoulder is important to prevent leakage.
entire assembly into adapter forcing bearing into
bearing bore.
r.
Place "0" ring seal around wear plate and
gear. Lubricate contact surfaces of seal and wear
plate.
s.
Clearance between gear faces and wear
plates is provided by the plastic shim gaskets
between housing, inner wear plate and outer wear
plate.
t.
Measure the width of gear housing and gears
with an outside caliper micrometer.
u.
The following chart indicates location and
number of shims to use. If gears are so worn that
housing width becomes more than 0.002" greater
than gear width, both gears should be replaced.
v.
Insert driven assembled gear and shaft into
adapter end. Line up marks previously made on
gear faces if original gears are used. Keep
keyways 180 degrees apart if new gears are used.
Lubricate faces of gears with light oil.
FIGURE 18 Special Bearing Driving Tool and
Dimensions
7-5
