Tulsa RUFNEK 130, Service Manual

Page: 7 / 29

7
B. BRAKE SECTION DISASSEMBLY
1. Evenly remove the four capscrews (60) that
hold the brake cover (18) in place. Spring
pressure will raise the cover up as the cap
screws are loosened. Carefully remove the
cover (18) from the brake housing (16).
Inspect the o-ring (61) for damage.
2. Remove the springs (59) from the piston
(54) and check the free height. Each spring
should measure at least 1.240 inches with
no force on them.
3. Remove the piston (54) by installing two
pieces of 3/8”-16NC all thread into the two
holes in the top of the piston and run in
evenly until the piston is clear of the
housing. An alternative method of removing
the piston is to use shop air to slowly
pressurize the brake port to remove the
piston from the brake housing (16).
4. Inspect the o-rings (55, 57) and back up
rings (56, 58) on the piston. Grasp the
brake driver/clutch assembly (assembled
items 64, 65, 66, 67, 69, 95) and remove it
from the brake housing.
5. Remove the stator plates (52) and friction
discs (53) from the brake housing and check
them for excessive wear, and replace if
necessary. Be sure to check the top stator
plate for scoring caused by the removal of
the piston and polish if needed. Friction
discs should measure no less than .055-in.
thickness and stator plates should measure
no less than .068-in thick.
(Continued on page 8)