TM 9-4940-568-20
2-176
Table 2-21. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9. CRANE WILL NOT SWING CLOCKWISE USING REMOTE CONTROL.
NOTE
Before performing crane troubleshooting procedures, make sure the FRS electrical
supply system is functioning properly.
Unless advised otherwise, the FRS 24V MASTER switch and the crane MAIN
POWER switch must be in the ON position for all voltage checks.
Test 1.
Loosen screw and remove connector from swing CW solenoid. Place MAIN
POWER and EMERGENCY STOP switches in ON position. Hold remote control
unit swing controller in CW position and check for 24 volts between solenoid
connector, terminal 1, and known good ground.
If 24 volts are not present, go to Test 2.
If 24 volts are present, turn MAIN POWER switch OFF and go to Test 8.
Test 2.
Disconnect the remote control cable from the remote control unit and remote control
hook-up connector on crane sub-frame. Check the cable for continuity between the
two cable ends, terminal L.
If no continuity is found on terminal, replace the remote control cable.
If continuity is found, go to Test 3.
