TM 9-2350-256-34-2NOTEIf 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 loadcell orweights are unavailable, attach cable to an anchor or adjust winch brake full tight. Refer to TM 9-2350-256-20for brake adjustment procedure.Step 3 If using anchor or winch brake, use adjusting screw on hoist winch combination control valve (figure 2-5) toreduce pressure as far as possible. Turning in a counterclockwise direction will decrease pressure.Step 4 Set engine speed at 1600-1800 rpm.NOTEThe adjustment and load test shall be accomplished with the hydraulic reservoir oiltemperature at100F to 130F.c. Hoist Winch Combination Control Valve Adjustment. Adjust to achieve hoisting requirements as follows:CAUTIONDo 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 willincrease pressure.Step 2 Activate winch to raise in low gear.CAUTIONDo not exceed 1000 psi relief pressure.Step 3 If using anchor or winch brake, adjust relief pressure tooriginal 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.NOTEIf 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.NOTEIf adjustment was done using calibrated weights or a load cell no further load test isrequired. If relief valve was set with anchor or brake, proceed with load test givenbelow.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. Therear of an M88A1, a medium tank, or equivalent may be used.NOTEIf 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 leverin LOVER position, adjust counterbalance valve (figure 2-6) by turning adjusting screw until hoist winch provides asmooth lowering capability.Change 42-30
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