Ramsey Winch H-89 - Manual (Page 8)

8
ADJUSTING THE OIL COOLED HOLDING
BRAKE
The oil cooled, fully adjustable, automatic holding
brake operates in the worm housing lubricant, all
parts being submerged in oil. 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 the 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 on the
Model H-89 Dow-Lok® should be 68 to 75 Nm (50
to 55 ft- lb). If 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, checked
the torque reading. Continue this procedure until
the proper torque reading is achieved, then
tighten the lock nut.
SERVICING OF THE OIL COOLED
HOLDING BRAKE
1. Remove the drain plug and drain the worm
gear oil from the worm housing.
2. Back off the lock 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 which slots
balls are in, #1 or #2. This will determine the
brake engagement direction.
6. Insert parts as follows:
a) Composition brake discs are 6,4 mm (1/4")
thick when new. Replace if thinner than 4,8
m (3/16”) or if surfaces are glazed or burnt.
b) Inspect the flat, ground surface of the
camplate 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".
WORM HOLDING BRAKE
LEAF SPRING
COIL SPRING
BRAKE HOUSING
COVER
MOUNTING
SCREW
ADJUSTING
SCREW
DIAGRAM 1
BRAKE COVER
THREAD SEAL
JAM NUT
RETAINER PLATE
CAM PLATE
GASKET
PIN
A
BRAKE DISC
(LOOKING AT CAM
PLATE FROM WINCH)
VIEW A-A
1
2 1
2
COMPOSITION
A
BALL
HUB