TM 9-2320-279-34-1
Troubleshooting Malfunctions (Cont)
2-7. TROUBLESHOOTING INSTRUCTIONS (CONT).
Table 2-3. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
MATERIAL HANDLING CRANE (M977, M985, M984E1) (CONT)
1.
CRANE WILL NOT OPERATE MANUALLY OR WITH REMOTE CONTROL (CONT).
Step 2. Check that shut-down solenoid valve operates. Set ENGINE and PTO ENGAGE switches to
ON. Move crane POWER switch ON and OFF several times. Listen for clicking sound of
solenoid to tell if solenoid operates.
If solenoid clicks but crane will not operate, try to operate crane using emergency
procedures (TM 9-2320-279-10).
If crane operates, replace defective shut-down solenoid valve (para 17-32 for M977
and M985), (para 17-32.1 for 11984E1).
If crane does not operate (M977 and M985). refer to Hydraulic System
Troubleshooting.
If crane does not operate (M984E1). refer to Step 4.
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