SCREW
BOOM DOWN
SOLENOID FRONT
CONNECTOR
SOLENOID
COIL
TERMINAL 2
TERMINAL 1
TM 9-4940-568-20
2-150
Table 2-21. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. BOOM DOES NOT LOWER WITH REMOTE CONTROL (CONT).
Test 9.
Check for continuity between terminal strip, position 14, and boom DOWN solenoid
connector, terminal 1.
If no continuity is found, repair white wire between junction box terminal strip,
position 14, and boom DOWN solenoid. Refer to paragraph 3-16 in this manual.
If continuity is found, go to Test 10.
Test 10.
Check for continuity between boom DOWN solenoid connector, terminal 2, and
known good ground.
If no continuity is found , repair boom DOWN 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, replace coil. Notify Supervisor.
END OF TEST
