M977, M985, and M984E1 Crane Maintenance Instructions (Cont)
17-33.1. OVERLOAD SENSOR SWITCHES ADJUSTMENT (M984E1) (CONT).
16,700 lb Weight Adjustment.
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.
Boom must be positioned between 40° and maximum
boom angle 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 attach.
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 smothly and slowly
when performing test.
Loosen nut (6) 1/8 to 1/4 turn. Push
switch D in toward plate (7).
Tighten nut (8).
Repeat steps (4) through (7) until
weight can be lifted.
Loosen nut (8) 1/8 to 1/4 turn.
Tighten nut (6). Overload sensor
switch D is adjusted.
Loosen nut (8) 1/8 to 1/4 turn. Push
switch D 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 D is adjusted.