MAIN
POWER
SCREW
SOLENOID
COIL
TERMINAL 2
TERMINAL 1
BOOM UP
SOLENOID REAR
CONNECTOR
TERMINAL 2
TERMINAL 1
TM 9-4940-568-20
2-158
Table 2-21. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. BOOM DOES NOT RAISE WITH REMOTE CONTROL (CONT).
Test 9.
Check for continuity between terminal strip, position 13, and boom UP solenoid
connector, terminal 1.
If no continuity is found, repair white wire between junction box terminal strip,
position 13, and boom UP solenoid. Refer to paragraph 3-16 in this manual.
If continuity is found, go to Test 10.
Test 10.
Check for continuity between boom UP solenoid connector, terminal 2, and known
good ground.
If no continuity is found, repair boom UP solenoid ground circuit. Refer to
paragraph 3-16 in this manual.
If continuity is found, go to Test 11.
Test 11.
Perform a resistance check of solenoid coil. Resistance should be between 23.7
and 26.3 ohms from terminal 1 and terminal 2.
If coil resistance is not within specifications, Notify Supervisor.
END OF TEST
