TM 9-2350-256-34
0011 00
CORRECTIVE ACTION Continued
11. Inspect APU emergency winch control valve lever for improper position.
a.
Place APU emergency winch control valve lever in CLOSED position.
WARNING
Main winch must be in high range (step 12 only).
12. Test for faulty pilot-operated relief and unloading valve. Attempt operation of boom and winches.
If winches operate, but boom and spade fail to operate, it indicates a faulty pilot-operated relief and
unloading valve. Shift main winch into high range and inhaul cable completely (clevis contacting front
of plate). Continue holding main winch control lever in this position and attempt to operate spade
combination control valve lever. Release both levers to neutral and operate spade combination control
valve lever.
a.
If the spade does not function, replace pilot-operated relief and unloading valve (WP 0051 00).
13. Test for spade combination control valve failure. Install pressure gage in pilot operated relief and
unloading valve gage port. If, when actuating boom combination control valve lever, operating
pressure (19502050 psi [13,44514,135 kPa]) is recorded on pressure gage, but when actuating
spade combination control valve lever, no pressure is recorded on gage; it indicates a faulty spade
combination control valve. For location of valve gage port, refer to WP 0065 00.
a.
14. Test for restricted or blocked cylinder return hose. Install pressure gage in pilot operated relief and
unloading valve gage port. If, when actuating spade combination control valve lever, operating
pressure (19502050 psi [13,44514,135 kPa]) is recorded, return hose is restricted or blocked. For
a.
Remove any restriction or replace blocked hose (TM 9-2350-256-20).
15. Test for mechanical failure of hydraulic cylinders. Install test gage in pilot-operated relief and unload-
ing valve gage port. If, when actuating the spade combination control valve lever, operating pressure
(19502050 psi [13,44514,135 kPa]) is recorded and no return hose is blocked, it indicates mechanical
failure of a hydraulic cylinder. For location of valve gage port, refer to WP 0065 00.
a.
b.
16. Test for spade combination control valve failure. Install pressure gage in pilot operated relief and
unloading valve gage port. If, when actuating boom combination control valve lever, operating
pressure (19502050 psi [13,44514,135 kPa]) is recorded on pressure gage, but when actuating
spade combination control valve lever, no pressure is recorded on gage; it indicates a faulty spade
combination control valve. For location of valve gage port, refer to WP 0065 00.
a.
17. Worn spade hydraulic cylinder packings.
a.
b.
18. Ruptured hydraulic hose.
a.
Replace hydraulic hose (TM 9-2350-256-20).
19. Damaged spade release valve.
a.
Replace spade release valve (TM 9-2350-256-20).
0011 00-3