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 TM 55-1905-217-34
(2) Before removing port plate (3) put indexing mark on the port plate (3) and motor housing (2) to
enable proper positioning of port plate (3) at reassembly.
(3) Remove port plate cap screws (11) and lockwashers that hold port plate (3) to housing assembly (2).
There is a slight spring load on this plate and upon loosening the screws, any oil left in housing will
drain out. Remove port plate (3). Remove motor barrel assembly (16 and 17) by turning housing
upside down and allowing the barrel and pistons (16 and 17) to slide off spline of shaft (7). Remove
pistons (17) from barrel (16). (4) Remove retainer ring (26). Press shaft (7) out of housing from port
plate end. The seals (23 and 25) , seal holder (24) and shaft bearing (21) will come out with shaft
(7).
(5) To remove thrust bearing (19) , press against thrust bearing housing (20) with a little pressure and
the bearing housing with thrust bearing assembly will come out of port plate end as an assembly.
Remove thrust bearing plate (18). To remove thrust bearing (19) from thrust bearing housing (20) ,
apply heat to housing and press out thrust bearing (19).
CAUTION
DO NOT apply excessive heat. DO NOT remove thrust
bearing (19) unless it is to be replaced.
c. Cleaning, Inspection, and Repair.
(1) Clean all parts with solvent (FED. SPEC. PD-680) , and dry thoroughly.
(2) Clean all passages with compressed air.
(3) Pinion gear housing (28). Visually check housing for cracks or other damage. Examine bearing (27)
for damage or wear. Replace, if necessary.
(4) Drive assembly (29). Examine pinion gear to be sure that the teeth are not worn excessively or
chipped from interference with ring gear. Check to insure that the compressing spring are not
damaged or broken.
(5) Port plate assembly (3). The port plate face, where cylinder rides, must be smooth and free of
scoring. Also check the bearing (6) and replace if necessary.
(6) Motor barrel (16). Examine the potted face of the cylinder for scratching or scoring. Slight scuff
marks can be removed by lapping on a surface plate. The bores of the cylinder (16) should be
smooth and free of scoring.
(7) Pistons (17). The diameter of the pistons (17) should be smooth and free of scoring. The closed
end of the pistons may show brinnelling where they contact the thrust bearing plate (18) , but no
burrs or flat spots are permissible.
(8) Shaft (7). Check the ends of the shaft for wear or scoring. Thesplines should be smooth and free of
nicks. Check the bearing (21w and replace if necessary.
(9) Seal assembly (24). Replace the seals (23 and 25).
d. Reassembly.
(1) Be sure all parts are clean and free of burrs before starting reassembly. Use clean light oil to
lubricate parts before assembly.
(2) Install the ball bearing (21, figure 4-16) on shaft (7). Install retaining ring (22). Press shaft (7) with
ball bearing (21) and retaining ring (22) into the housing (2). Install seal holder (24) with seals on
shaft (7). Install retaining ring (26).
(3) Install thrust bearing housing (20) with thrust bearing (19) into housing (2) with slight pressure. Press
it until it has bottomed against housing (2). Be sure dowel pin (33) is in place. Install thrust bearing
plate (18) into thrust bearing (19).
(4) Install the barrel (16) with pistons (17) on shaft (7). Be sure that the spring (14) in the cylinder is in
place. Assemble the port plate (3) to the housing (2). To insure best alinement between the port
plate and the motor housing, put the pinion housing (28) on the motor before tightening the cap
screws (11). Torque screws (11) to 300 in-lbs. There should be slightprecompression of the barrel
(16) with the port plate (3). If not, replace spring (14) in the cylinder (16).
e. Installation. Install the hydraulic starting motor (TM 55-1905-217-12, para 4-63).
4-7. Hydraulic Starter Pump
a. Removal. Remove the hydraulic pump (TM 55-1905-217-12, para 4-63).
b. Disassembly.
(1) Remove the nut (46, fig. 4-17) and lock- washer and withdraw the pump drive (44) from the shaft (8).
4-28
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