10. Verify smoothness of lowering capability.
If adjustment procedure was done using calibrated weights or load cell, no further load test is required.
If relief valve was set with anchor or brake, proceed with the load test that follows.
LOAD TEST--Perform steps 1 thru 3 for the load test of the hoist winch.
The following load test must be performed with the hydraulic reservoir oil temperature at 100 F130 F
(38 C54 C).
Verify lifting capability by rigging a four-part line and raising and lowering a load of at least 25,000 lb (11,340 kg). The
rear of an M88A1, a medium tank, or equivalent may be used.
If smooth lowering capability is not obtained, adjust counterbalance valve (60). Refer to step 4 below
for adjustment procedure.
Verify smoothness of lowering capability.
If vehicle fails to pass the load test, repeat the above ADJUSTMENT procedures.
COUNTERBALANCE VALVE ADJUSTMENT--Perform step 4 to adjust the counterbalance valve
With engine operating at 1600 to 1800 rpm and HOIST WINCH operating lever in LOWER position, adjust counterbalance
valve (60) by turning adjusting screw (61) until hoist winch provides a smooth lowering capability.
END OF WORK PACKAGE
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