Ramsey Winch 300/H-300 RAM-LOK - Manual (Page 7)

7
ADJUSTING THE OIL COOLED WORM BRAKE
The oil-cooled, fully adjustable, automatic safety brake operates in the worm housing lubricant, all parts being submerged in oil.
When the brake wears to the point that the load begins to drift, the brake can be adjusted as follows:
1. Loosen the lock nut on the adjusting screw.
2. Tighten the brake by turning the adjusting screw clockwise. CAUTION: Only 1/4 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 will 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 rating for the brake should be
13-18 ft-lbs. (17-24 Nm). If the torque wrench does not show the proper
value as it turns, then the worm brake adjusting bolt should be turned
clockwise 1/4 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.
SERVICING OF THE OIL COOLED SAFETY BRAKE
1. Remove the drain plug and drain the worm gear oil from the worm housing.
2. Back off the jam nut, then the adjusting screw, both two turns or more by turning them counter-clockwise.
3. Remove the cover mounting screws.
4. Remove the cover along with coil spring and leaf spring.
5. Remove the retainer plate, composition brake disc, cam plate and balls. Note slots balls are in.
6. Inspect parts as follows:
a. Composition brake discs are 1/8" (3 mm) thick when new. Replace if thinner than 0.080" (2 mm) or if surfaces are
glazed or burnt.
b. Inspect the flat, ground
surface of the cam
plate and retainer plate
for glazing, warpage, or
other damage. Glazing
can be removed by
scraping carefully.
c. Inspect the leaf spring.
It should be bowed 1/8"
(3 mm).
SCREW
ADJUSTING
JAM NUT
THREAD SEAL
SCREW
MOUNTING
COVER
WORM BRAKE
DIAGRAM 1
BRAKE COVER
RETAINER PLATE
PLATE FROM WINCH)
(LOOKING AT CAM
BRAKE HOUSING
HUB
CAM PLATE
COIL SPRING
BRAKE DISC
COMPOSITION
LEAF SPRING
BALL
VIEW
GASKET
PIN
TUBING
CAP
ADAPTER
SOCKET
NUT