MAIN
POWER
TM 9-4940-568-20
2-172
Table 2-21. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8. BOOM DOES NOT TELESCOPE OUT WITH REMOTE CONTROL (CONT).
Test 7.
Connect the remote control cable to the remote control unit and remote control
hook-up connector on crane sub-frame. Turn MAIN POWER switch and
EMERGENCY POWER switch to ON position. Check for 24 volts from controller
harness, blue wire, with controller in DOWN position to known good ground. Turn
MAIN POWER switch OFF.
If 24 volts are not present, replace controller circuit card. Refer to paragraph 5-12
in this manual.
If 24 volts are present, reassemble remote control unit and go to Test 8.
