SECTION 9
STEERING
bearings, forcing them towards the gears.
Pressure from the outlet side of the pump Is
against the opposite side of the bearings.
When the two (2) pressures are balanced, a
thin film of oil exists between the gears and
bearings, and actual gear-to-bearing contact is
prohibited.
9-83. Oil is prevented from by-passing the
body and end covers by neoprene gaskets
between the components. A replaceable shaft
seal is pressed into the front cover. Communi-
cation of the high pressure and low pressure
oils between the bearings and front cover Is
prevented by a "W" shaped seal. The two (2)
pressures are separated by an o-ring and
back-up ring placed on each bearing hub and
between the bearings and cover.
9-84. DISASSEMBLY.
FIGURE 9-80.
a. Clean pump exterior. Remove woodruff
key and capscrews. Separate rear cover from
body. Remove and discard gasket. Remove
front cover. Remove and discard front cover
gasket. Lift out "W" shaped gasket seal and
neoprene spacer (see figure 9-79). Drive out
shaft seal.
b. Mark relative position of front and rear
bearings and body (see figure 9-80). Do not
scratch. Use Prussian blue for marking of all
pump parts. Push on rear of gear shafts until
front bearings are free of the housing (see
figure 9-81). Remove bearings. Mark relative
position of gears, then extract gears. Match
mark and remove rear bearings.
FIGURE 9-81.
9-85. CLEANING AND INSPECTION.
a. Clean all parts thoroughly in cleaning
solvent.
b. Check gears and shafts for nicks, burrs,
cracks, or chipping. Discard defective com-
ponents.
c . Examine gear chamber of body for
contact between gears and body, especially the
Intake cavity of the body. Although wear of
more than 1/64 of inch (.397 mm) is abnormal,
it is not critical if the bearings are not
defective. The intake cavity is shown in figure
FIGURE 9-79.
9-82.
9-19.