TM 55-4920-394-13&P
b. Insert shaft and bearing into mounting flange (77). Seat bearing snugly against shoulder in flange.
c. Place O Ring (80) on seal retainer (78) and insert shaft seal (81) into bore of seal retainer. Take care not
to cut or scratch inner sealing of shaft seal.
d. Again using care not to damage shaft seal, insert seal retainer into pilot bore of mounting flange while
slipping shaft seal over shaft.
e. Secure seal retainer to mounting flange with six socket head cap screws (79). Tighten screws 18 to 20
inch pounds each. Do not overtighten. There should be clearance between seal retainer and mounting flange.
f. Insert bearing (65) into port block (59) and secure with snap ring (66).
g. Install O Ring (63) on mounting flange (77).
h. Insert six O Rings (64) into port block (59).
i. Install pump cartridge driver member (74) inside driven member (75) and insert pump cartridge assembly
into eccentric ring (77) of gerotor assembly (71).
j. Install gerotor assembly (71) in port block (59) and secure with dowel pin (73).
k. Insert key (76) into key way in pump shaft (82) and assemble mounting flange (77) and shaft to port
block (59). Take care to align key (76) in slot of gerotor assembly driver (74) and dowel pin (73) in slot in pilot
mounting flange (77).
l. Place O Ring (62) over pilot on port block (69).
m. Insert dowel pin (58) into port block face in proper position to obtain desired shaft rotation; pin at top of
block for clockwise rotation; pin at bottom of block for counterclockwise rotation.
n. Slip hanger housing (91) over pilot on port block, orienting housing so that machined surface for indicator
plate (19) is on left side of pump when viewed from shaft end.
o. Secure port block (59) and mounting flange (77) to hanger housing (91) with six socket head cap screws
(61). Torque screws 22 to 25 foot pounds. Check that 0. 0001 to 0. 0125 clearance remains between face of
mounting flange (77) and port block (59). Secure with lock wire (60).
p. Press inner race of barrel bearing (54) onto cylinder barrel (56), seating bearing against shoulder of
barrel and making certain that tapped holes in bearing align with holes in barrel.
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