TM 9-2320-279-34-3
M977, M985, and M984El Crane Maintenance Instructions (Cont)
c.
14,800 lb Weight Adjustment,
Boom must be positioned between 30° and
40° during adjustment.
Boom must be extended so that when the
weight is lifted, cable is on fifth layer,
against the right side of the drum (viewed
from hook end of boom).
(1)
(2)
(3)
(4)
Position hook block (1) over weight and
attach.
Deleted.
Deleted.
Lift weight.
NOTE
If hoist attempts to lift weight and
stops, do steps (5) through (9).
If hoist lifts weight and does not stop,
do steps (13) through (18).
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
Operate hoist smoothly and slowly
when performing test.
Lower weight.
Loosen nut (6) 1/8 to 1/4 turn.
Push switch C in toward plate (7).
Tighten nut (8).
Attempt to lift weight. Repeat
steps (5) through (7) until weight
can be lifted.
Loosen nut (8) 1/8 to 1/4 turn and
tighten nut (6). Overload sensor
switch C is adjusted.
Deleted.
Deleted.
Deleted.
Lower weight.
(15)
(16)
Loosen nut (8) 1/8 to 1/4 turn.
Push switch C away from plate (7).
Tighten nut (6).
Attempt to lift weight. Repeat
steps (13) through (15) until
weight cannot be lifted.
(17)
Loosen nut (6) 1/8 to 1/4 turn. Tighten nut (8). Overload sensor switch C is adjusted.
(18)
Deleted.
CAUTION
Be sure proper weight is used to adjust M984E1 crane, or equipment may be
damaged.
Do not operate crane with boom below horizontal when there is a load on hook.
Use only HOIST control to lift and lower weight or damage to equipment could result.
NOTE
Change 3
17-152.5
