TM 9-2320-272-24-4
5-47. FORWARD CLUTCH MAINTENANCE (Contd)
For general cleaning instructions, refer to para. 2-14.
1.
For general inspection instructions, refer to para. 2-15.
2.
Inspect turbine shaft and forward clutch housing (1) for scoring in area where seals contact
3.
turbine shaft (1). If scored, discard turbine shaft and forward clutch housing (1).
4.
Inspect clutch plates (2) for burned surfaces. If burned, discard clutch plates (2).
5.
Inspect clutch discs (3) for burned surfaces. If burned, discard clutch discs (3).
Measure thickness of fourth clutch drive hub (4) at clutch disc (3) contact area. If thickness is less
6.
than 0.248 in. (6.30 mm), discard fourth clutch drive hub (4).
Inspect valve spring (5) and piston return spring (6) for discoloration due to overheating. If
7.
discolored, discard.
Inspect valve spring (5) and piston return spring (6) for broken coils or coils distorted due to wear. If
8.
broken or distorted, discard.
Using spring tester, inspect valve spring (5) for serviceability.
9.
a. Compress valve spring (5) to 0.61 in. (15.5 mm) and check load (table 5-13).
b. If valve spring (5) does not give load of 5.7-6.3 lb (25.3-28 N), discard.
Using spring tester, inspect piston return spring (6) for serviceability.
10.
a. Compress piston return spring (6) to 1.28 in. (32.5 mm) (table 5-13).
b. If piston return spring (6) does not give load of 158-178 lb (707-791 N), discard.
Table 5-13. Spring Data.
COMPRESSED
COLOR
FREE LENGTH
SPRING
UNDER LOAD
LENGTH
0.76 in.
0.61 in.
5.7-6.3 lb
Valve spring
Green
(19.3 mm)
(25.3-28 N)
(15.5 mm)
Piston return
3.22 in.
1.28 in.
158-178 lb
None
spring
(81.8 mm)
(32.5 mm)
(702-791 N)
5-326