TM 9-4940-568-34
2-68
Table 2-7. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
11. BOOM CREEPS DOWN (Continued).
Check for faulty boom lift cylinder or holding valve assembly. Attach lifting device to boom.
Support boom with lifting device, stop FRS and disconnect hose from fitting at bottom of
each boom lift cylinder. Allow fluid in fitting to drain. Lower lifting device to exert pressure
on lift cylinders. No drainage should be present at fitting.
If drainage is present, replace holding valve assembly on cylinder. Refer to
paragraph 6-9.
If drainage is not present, repair or replace boom lift cylinder. Refer to paragraph
3-18 or 6-9.
END OF TEST
LIFTING
DEVICE
BOOM
BOOM LIFT
CYLINDER
