M977 and M985 Operating Procedures (Cont)
Be sure there are at least two wraps of cable on hoist
drum at all times. Serious injury or death could result
if cable comes off hoist drum while lifting load.
Do not jerk HOIST control lever or load will bounce
causing possible damage to crane or load.
Do not operate crane with boom below horizontal
when there is a load on hook.
For M977, maximum load limit with boom length
under 9 ft (2.75 m) is 4500 lbs (2 043 kg). Maximum
load limit with boom extended over 9 ft (2.75 m) is
2500 lbs (1 135 kg).
For M985, maximum load limit is 5400 lbs (2 452 kg)
for entire boom reach.
When crane is overloaded, M977 and M985 overload
systems will automatically shut off power to telescope
boom out, raise boom, or hoist load any higher. The
M977 overload system will also prevent lowering load to
ground or other supporting surface. All crane functions
will be restored in approximately six seconds.
Move HOIST control lever (3) in UP position to lift load. Move BOOM
control lever (6) in UP position to raise load higher.
Move HOIST control lever (3) in DOWN position to lower load. Move
BOOM control lever (6) in DOWN position to lower load further.
Shut down crane (para 2-18f).