TM 9-2350-256-34-2
NOTE
If using anchor, do not adjust brake.
Step 2 Place load on winch. Use calibrated weights or load cell if available. Load cell must be anchored. If load
cell or
weights are unavailable, attach cable to an anchor or adjust winch brake full tight. Refer to TM 9-2350-256-20
for brake adjustment procedure.
Step 3 If using anchor or winch brake, use adjusting screw on hoist winch combination control valve (figure 2-5) to
reduce pressure as far as possible. Turning in a counterclockwise direction will decrease pressure.
Step 4 Set engine speed at 1600-1800 rpm.
NOTE
The adjustment and load test shall be accomplished with the hydraulic reservoir oil
temperature at 100F to 130F.
c. Hoist Winch Combination Control Valve Adjustment. Adjust to achieve hoisting requirements as follows:
CAUTION
Do not exceed 1000 psi relief pressure.
Step 1 If using calibrated weights or load cell, use adjusting screw on hoist winch combination control valve (figure 2-5)
to adjust relief pressure to achieve maximum lift of 50,000 to 55,000 lb. Turning in a clockwise direction will
increase pressure.
Step 2 Activate winch to raise in low gear.
CAUTION
Do not exceed 1000 psi relief pressure.
Step 3 If using anchor or winch brake, adjust relief pressure to original value recorded in Vehicle Log Book.
Step 4 Verify setting with locking nut in locked position, and record new setting in Vehicle Log Book.
Step 5 Disconnect pressure gage. Disconnect weights, load cell or anchor or readjust winch brake.
NOTE
If smooth lowering capability is not obtained, adjust counterbalance valve (figure 2-
6). Refer to paragraph 2-21 e for adjustment procedure.
Step 6 Verify smoothness of lowering capability.
NOTE
If adjustment was done using calibrated weights or a load cell no further load test is
required. If relief valve was set with anchor or brake, proceed with load test given
below.
d. Load Test.
Step 1 Verify lifting capability by rigging a four part line and raising and lowering a load of at least 25,000 pounds. The
rear of an M88A1, a medium tank, or equivalent may be used.
NOTE
If a smooth lowering capability is not obtained, adjust counterbalance valve (figure 2-
6). Refer to paragraph 2-21 e for adjustment procedure.
Step 2 Verify smoothness of lowering capability.
Step 3 If vehicle fails to pass the load test, perform adjustment procedures as presented in paragraph 2.21 b and c.
e. Counterbalance Valve Adjustment. With engine operating at 1600 to 1800 rpm and HOIST WINCH operating lever
in LOVER position, adjust counterbalance valve (figure 2-6) by turning adjusting screw until hoist winch provides a
smooth lowering capability.
Change 4
2-30
