TM 9-4940-568-20
2-200
Table 2-21. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. BOOM DOES NOT RAISE OR LOWER.
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.
Are the two hoses and fittings between the BOOM manual control valve and boom
hydraulic cylinders free of damage, crimps or leaks?
If leaks or damaged lines are found, repair as needed. Refer to paragraph 7-4 in
this manual.
If no leaks or damage are found, go to Test 2.
Test 2.
Are the three hoses and fittings between the two boom hydraulic cylinders free of
damage, crimps or leaks?
If leaks or damaged lines are found, repair as needed. Refer to paragraph 7-4 in
this manual.
If no leaks or damage are found, Notify Supervisor.
END OF TEST
