TM 9-2320-272-24-4
5-48. FOURTH CLUTCH MAINTENANCE (Contd)
5.
Remove backplate snapring (1) from fourth clutch housing (5).
CAUTION
The fourth clutch consists of a backplate, five clutch plates, and
five clutch discs. Keep all clutch parts together. Intermixing fourth
clutch parts with any other clutch part will cause transmission
damage.
NOTE
Tag all fourth clutch parts for reassembly.
6.
Remove
backplate (2), five clutch plates (4), five clutch discs (3), and piston (8) from fourth clutch
housing
(5).
7.
Remove
piston outer seal ring (7) from piston (8). Discard seal ring (7).
8.
Remove
piston inner seal ring (6) from fourth clutch housing (5). Discard seal ring (6).
1.
For general cleaning instructions, refer to para. 2-14.
2.
For general inspection instructions, refer to para. 2-15.
3.
Inspect five clutch plates (4) for burned surfaces. If burned, discard clutch plates (4).
4.
Inspect five clutch discs (3) for burned surfaces. If surface of clutch disc (3) is burned, discard clutch
disc (3).
5.
Inspect piston return spring (9) for discoloration due to overheating. If discolored, discard piston
return spring (9).
6.
Inspect piston return spring (9) for broken coils or coils distorted due to wear. If coils are broken or
distorted, discard piston return spring (9).
NOTE
Free length of piston return spring is 3.22 in. (81.8 mm).
7.
Using spring tester, inspect piston return spring (9) for serviceability.
a. Compress piston return spring (9) to 1.28 in. (32.5 mm).
b. If piston return spring (9) does not give load of 158-178 lb (703-791 N), discard.
8.
Measure backplate (2) thickness. If backplate (2) thickness is less than .248 in. (6.30 mm), discard.
5-334
