M977, M985, and M984E1 Crane Maintenance Instructions (Cont)
Repeat steps (4) through (7) until weight can be lifted.
Loosen nut (8) 1/8 to 1/4 turn and tighten nut (6). Overload sensor switch A is adjusted.
Loosen nut (8) 1/8 to 1/4 turn. Push switch A away from plate (7).
Tighten nut (6).
Attempt to lift weight. Repeat steps (12) through (14) until weight cannot be lifted.
Loosen nut (6) 1/8 to 1/4 turn. Tighten nut (8). Overload sensor switch is adjusted.
10,000 Ib Weight Adjustment.
Be sure proper weight is used to adjust M984E1 crane, or equipment may be
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.
Boom must be positioned between 25° and
30° during adjustment.
Boom must be extended so that when the
weight is lifted, cable is on fourth layer,
against the left side of the drum (viewed
from hook end of boom).
Position hook block (1) over weight and