TM 9-4940-568-34
2-72
Table 2-7. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
12. HOIST DOES RAISE OR LOWER OR RAISES SLOWLY (Continued).
Test 3.
Disconnect the brake release line at the hoist brake on the right side of boom. Install test
fitting and 0-5,000 psi (34,475 kPa) gage in the brake release line. Start FRS. Have
assistant operate HOIST control lever to attempt to lower hoist. Create 3,000 - 3,200 psi
(20,684 to 22,063 kPa) working pressure.
If pressure is within specifications, replace hoist assembly. Refer to
paragraph 3-26.
If pressure is not within specifications, replace hoist motor control valve. Refer to
paragraph 3-38.
END OF TEST
HOIST
CONTROL
LEVER
HOIST
ASSEMBLY
BOOM
