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TM 10-3930-632-34
a.
e.
Match-mark the cover, ring, and body to
Inspect the face of the pressure plate that
assure proper Reassembly.
rides on the vanes for scoring.  Lap out scores with
b.
Clamp the drive gear lightly in a soft-jawed
crocus cloth.  Replace the pressure plate if scores
cannot be removed.
vise to prevent the shaft from rotating while removing the
f.
Inspect the bearings for wear, pitting, and
nut (12).
c.
After removing the cover (2), ring (7), and rotor
looseness; replace damaged bearings.
g.
Inspect the shaft for distortion, worn or
(8), remove the retaining ring (11) and press on the
damaged splines, and damaged threads.  Check the
splined end of the shaft (14) to remove the assembled
keyway for burrs. Remove any burrs with a fine stone.
shaft and bearing (15) from the body (18).
d.
h.
Pry the seal (17) from the body (18) with a thin,
Inspect all other parts for cracks, distortion,
hooked tool.
worn or damaged threads, and other damage; replace
damaged parts.
WARNING
4-12.
Reassembly
Dry cleaning solvent, P-D-680, used to clean
parts is potentially dangerous to personnel and
Refer to figure 4-2 and reassemble the main hydraulic
property. Avoid repeated and prolonged skin
pump. Note the following:
contact.  Do not use near open flame or
excessive heat. Flash point of solvent is 100
a.
Lubricate all parts with clean engine oil at
F. - 138 F (39 C. - 59 C.).
Reassembly.
b.
Install the seal (17) with the lip facing inward in
the body.
4-11.
Cleaning and Inspection
c.
Align the match-marks made on the cover (2),
a.
Discard the seal and preformed packings.
ring (7), and body (18) during disassembly.
b.
Thoroughly clean all parts of the pump
d.
When installing the splined end of the shaft
assembly, except the bearings, in cleaning solvent P-D-
(14) through the seal (17), apply a thin layer of
680, and shake excess solvent from the parts and dry
cellophane tape over the splines to prevent cutting the
with compressed air.
seal.
c.
Clean the bearings by placing them in a wire
e.
Torque the screws (1) evenly and alternately to
basket and agitating them in clean solvent.  Dry with
a torque of 65 to 75 ft/lbs.
compressed air taking care not to spin the dry bearings.
f.
Install gear and nut on pump shaft. Stake nut
Dip in engine oil to lubricate the bearings.
in place.
CAUTION
4-13.
Installation
Do not use a cloth to wipe the pump parts
a.
Install the assembled pump and adapter and
because lint trapped in the parts can enter the
the gasket on the engine backing plate (para 9-21).
hydraulic system at Reassembly.
b.
Connect the hydraulic lines to the hydraulic
pump (TM 10-3930-632-12).
d.
Inspect the ring, rotor, and vanes for wear,
scoring, distortion, or other damage. Replace the ring,
4-14.
Testing
rotor, and vanes in complete sets only, if damaged.
Refer to figure 4-3 and test the hydraulic pump as
follows:
NOTE
No side play is allowable in vane movement in
the rotor slots.
4-5

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