(4)
Lift weight.
If hoist attempts to lift weight and stops, do steps (5) through (9).
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
If hoist lifts weight and does not stop, do steps (10) through (14).
Lower weight.
Loosen nut (5) 1/4 turn. Push switch (6) in toward plate.
Tighten nut (7).
Attempt to lift weight. Repeat steps (5) through (7) until weight can be lifted.
Loosen nut (7) 1/4 turn. Tighten nut (5). Overload sensor switch is adjusted.
Lower weight.
Loosen nut (7) 1/4 turn. Push switch (6) away from plate.
Tighten nut (5).
Attempt to lift weight, Repeat steps (10) through (12) until weight cannot be lifted.
Loosen nut (5) 1/4 turn. Tighten nut (7). Overload sensor switch is adjusted.
TM 9-2320-279-34-3
M977, M985, and M984E1 Crane Maintenance Instructions (Cont)
CAUTION
Use only HOIST control to lift and lower weight or damage to equipment could result.
Do not operate crane with boom below horizontal when there is a load on hook.
Use 6200 lb (2815 kg) weight for M985 overload switch (B) adjustment.
Use 5400 lb (2452 kg) weight for M977 main overload switch (A) adjustment.
Use 3200 lb (1453 kg) weight for M977 reduced overload switch (B) adjustment.
NOTE
Operate hoist smoothly and slowly when performing test.
NOTE
b.
Follow-on Maintenance. Stow crane (TM 9-2320-279-10).
END OF TASK
Change 3
17-151
