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 TM 55-1905-242-14
0190 00
DISASSEMBLY (continued)
9.
Remove the O-ring (31) and discard it in accordance with local regulations.
10. Remove the brake piston (32) from the shaft end cover (25).
11. Remove the O-rings (33 and 34) and backup rings (35 and 36) and discard them in accordance with local regulations.
12. Remove the pin (37) from the brake piston (32) only if replacement is required because of damage or wear.
13. Turn up the port end cover (14) and the shaft end cover (25) so that the thrust plates (23 and 38) are up. Pry off the thrust
plates with a knife blade or thin screwdriver. Take care not to mar the face next to the covers (14 and 25).
14. Remove the pocket seals (20, 21, 22, 39, 40, and 41) and discard them in accordance with local regulations.
15. Remove the spacers (18 and 42) and bushing seals (17 and 43) from the covers (14 and 25).
16. Remove the gaskets (15 and 44), packings (16, 45, and 46) and spacer (47) from the covers (14 and 25).
17. Remove the roller bearings (19 and 48) only if they will be replaced.
CLEANING
! CAUTION
Never use cleaning solvent or other substances to clean the thrust plates. Clean the
thrust plates only with clean, lint free wiping rags. Any other cleaning method can result
in damage to the thrust plates.
1.
Clean the thrust plates with clean wiping rags.
2.
Don protective gloves and goggles.
3.
Clean all parts except the thrust plates with cleaning solvent and dry with clean wiping rags. Allow the roller bearings to
air dry after cleaning.
INSPECTION
1.
Discard all O-rings, backup washers, and pocket seals and replace with new.
2.
Inspect the roller bearings to ensure that the rollers roll freely. Inspect the rollers for pits, breaks, or excessive wear.
Replace the bearing(s) if any of these conditions exist.
3.
Inspect the gears for scoring or roughness. Remove minor roughness with a fine hone. Replace any gears showing more
than minor scoring or roughness.
NOTE
If any of the gears or roller bearings are replaced because of excessive wear, it is good
practice to replace both the gears and the bearings. Replacement of one part and not the
other will cause premature wear of the new part because of its attempt to conform to the
wear pattern of the old part. Also, if the gears and bearings are replaced due to excessive
wear, carefully check the side of the gear housing bore that has the most wear. In most
cases, the gear housing will also have to be replaced along with the gears and bearings.
4.
Inspect the sun gear hubs and planet gear for excessive wear at the bearing points. If the wear exceeds 0.001 inch (0.03 mm)
on the hub diameter, the gear should be replaced. Replace gears in sets since they are matched at the time of manufacture.
0190 00-4
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