Section V. ADJUSTMENT AND LOAD TEST PROCEDURES FOR THE MAIN WINCH, HOIST WINCH
AND LIVE BOOM CAPABILITY
2-20. Adjustment and Load Test of Main
Valves are adjusted by vehicle manufacturer. Should verification of adjustment be
required, these procedures shall be used.
a. General. The main winch has an inhaul capacity of 90,000 pounds maximum, using a single part line on bare drum
(3 to 5 wraps minimum of cable on bare drum and not to exceed the first layer). The main winch combination control
valve shall be adjusted by the following procedures so that main winch will have a capacity as specified.
b. Vehicle Preparation. Prior to adjusting main winch combination control valve, the following shall be accomplished:
Test components (pressure gages, hoses, and fittings) must be capable of
withstanding a working pressure of 1950 to 2050 psi.
Step 1 Install pressure gage (NSN 4910-00-766-3355) in level wind gage port (figure 2-3).
Do not adjust brake if anchoring cable.
Step 2 Place load on winch. Use load cell if available and anchor. If load cell is unavailable, attach winch cable to an
anchoring device or adjust winch brake full tight. (Refer to TM 9-2350-256-20 for brake adjustment procedure.)
Figure 2-3. Main winch level wind gage port.
Step 3 If using anchor or winch brake, use adjusting screw on main combination control valve (figure 2-4) to reduce
pressure as far as possible. Turning in counterclockwise direction will decrease pressure.
Figure 2-4. Main winch combination control valve adjusting screw.
Step 4 Set engine speed at 1600-1800 rpm.
The adjustment and load test shall be accomplished with the hydraulic reservoir oil
temperature at 100
F to 130