TM 9-2320-279-34-3
M977, M985, and M984E1 Crane Maintenance Instructions (Cont)
17-33.1. OVERLOAD SENSOR SWITCHES ADJUSTMENT (M984E1) (CONT).
a.
7300 lb Weight Adjustment.
(1)
Measure the distance between the end of screw (0.1) and the face of nut (0.2). If measurement is
0.180 in. (4.57 mm), go to step (1.21. If measurement is not 0.180 in. (4.57 mm), go to step (1.1).
(1.1) Loosen nut (0.2) and adjust screw (0.1) with nut (0.3) to get a measurement of 0.180 in. (4.57
mm). Tighten nut (0.2).
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
Boom must be positioned between 0° and 25° during adjustment.
Boom must be extended so that when the weight is lifted, cable is on fourth layer,
against the right side of the drum (viewed from hook end of boom).
(1.2)
Position hook block (1) over weight and attach.
(2)
Deleted.
(3)
Deleted.
(4)
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 (12) through (17).
Operate hoist smoothly and slowly when performing test.
(5)
Lower weight.
(6)
Loosen nut (6) 1/8 to 1/4 turn. Push switch A in toward plate (7).
(7)
Tighten nut (8).
17-152.2
Change 3
