MAIN POWER
TM 9-4940-568-20
2-125
Table 2-21. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test 4.
Turn MAIN POWER switch to the OFF position. Remove swing controller from
remote control unit for access to EMERGENCY STOP switch. Remove
EMERGENCY STOP switch from remote control unit, but do not disconnect wires.
Refer to paragraph 5-12 in this manual for specific instructions.
CAUTION
Do not allow EMERGENCY STOP switch, swing controller wires, or terminals to
contact remote control unit during test. Failure to comply may result in damage to
equipment.
Turn MAIN POWER switch to ON position. Check for 24 volts at terminal of wire 4 of
EMERGENCY STOP switch.
If 24 volts are not present, turn MAIN POWER switch OFF and repair wire 4 inside
remote control unit between EMERGENCY STOP switch and remote control unit
cable connector terminal H.
If 24 volts are present, go to Test 5.
