Dover TWG TULSA WINCH 506W Service Manual - Page 11
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1. Evenly remove the two capscrews
(Item 20)
in place. Spring pressure will raise the cover as the capscrews are loosened. Remove
the cover from the brake housing.
(Item 24)
2. Remove the springs
should measure at least 1.200 inches with no force on them.
3. Remove the brake piston
bottom of two spring pockets. Using jam nuts, screw the all-thread pieces in evenly until the
piston is clear of the housing. An alternate way of removing the piston is to use a portable
power unit or shop air to slowly pressurize the brake cavity until the piston is out of the bore.
4. Remove the brake driver/clutch assembly
(Item 21)
housing
.
5. Remove the stator plates
check them for excessive wear, then replace if necessary. Additionally, check the top stator
plate for scoring caused by the removal tools and polish if necessary. Friction discs should
measure no less than 0.055 inches thick and stator plates should measure no less than 0.064
inches thick.
6. If necessary, remove the seal
(Item 72)
ring
.
7. If the brake housing
housing where the seal
8. Carefully disassemble the brake driver/clutch and note the side in which the markings on the
(Item 34)
clutch
are facing
facing the proper direction in order for the hoist to function properly. Inspect the surface on the
input and brake drivers
or spalling on the drivers then both it and the clutch must be replaced.
9. Re-assemble the driver/clutch assembly, making sure that the clutch is installed properly.
10. Install a new seal
(Item 7-9)
hoist, temporarily install the input sun gear
driver/clutch assembly onto the sun gear spline.
11. Install the stator plates
with a stator and alternating friction discs and stator plates. There is one more stator plate than
friction disc so you will finish with a stator plate.
12. Coat the new o-rings and backup rings
(Item 10)
the piston
.
13. Carefully install the piston
until it is seated.
SERVICING THE BRAKE
(Item 9)
and four nuts
(Item 10)
from the piston
(Item 10)
by installing two pieces of 3/8"-16NC all-thread in the
(Items 13, 14, 15, 17, 34, and 38)
(Item 19)
and friction discs
(Item 7-9)
from the brake housing by first removing the retaining
(Item 21)
is removed from the hoist, examine the journal on the brake
(Item 7-8)
runs for wear. If severely worn, replace the brake housing.
.
The clutch assembly must be re-assembled with the markings
(Items 13 & 38)
where the clutch
into the brake housing. If the brake housing is removed from the
(Item 19)
and friction discs
(Items 7-1, 7-5, 7-6, & 7-7)
See Fig. 5 for proper o-ring/backup ring installation
(Item 10)
into the brake housing
11
(Item 65)
holding the brake cover
and check the free height. Each spring
(Item 18)
from the brake housing and
(Item 34)
runs. If there is any pitting
(Item 8)
into the brake housing and slide the
(Item 18)
into the brake housing starting
with light oil and install onto
(Item 21)
from the brake
.
and gently tap it down