4004EH WINCH BRAKE ADJUSTMENT
ADJUSTING OIL COOLED WORM BRAKE
The oil-cooled, fully adjustable, automatic safety brake operates in the worm housing lubricant, all part being submerged in oil. When the brake wears to the point that the load begins to drift, the brake can be adjusted as follows:
Loosen the lock nut on the adjusting screw.
Tighten the brake by turning the adjusting screw clockwise. CAUTION: Only ¼ turn is usually required to adjust the brake. Over-tightening can cause overheating, and damage to the brake parts. Tighten the lock nut after adjustment is completed.
If the brake does not respond to adjustment then a new leaf spring and brake disc is needed.
A torque wrench can be equipped with a special adapter to fit the input shaft (worm) of the winch. The adapter can be made by welding a nut to the end of a piece of tubing as shown in the following figure.
After welding the cap and nut to the tubing, slot the tubing as shown. This will allow the special adapter to slide over the keyway and then act as a large socket. A torque wrench can then be used to apply the proper torque. Turn the torque wrench so that the drum turns in the spool out direction or lowering direction. The torque ratings should be between 15-18 ft-lbs.
If the torque wrench does not show the proper value as it turns, then the worm brake adjusting bolt should be turned clockwise ¼ turn. Each time the adjusting bolt is turned, check the torque reading. Continue this procedure until the proper torque reading is achieved. Then tighten the lock nut.