CD5515-2/YB5515-2 SERVICE MANUAL
9-16 Published 1-20-2017, Control# 483-02
5. Remove the bolts and nuts used to fasten the brake
mounting bracket assembly to the crane. Remove the
parking brake assembly.
6. Separate the mounting bracket assembly 31 from the
brake assembly.
7. Clamp the brake in a vice with soft jaws with the cover 3
in a vertical position.
NOTE: Clamping should be done on sides of the brake, not
on machined surfaces.
8. Remove bleeder screw 30.
9. Using a sharp bladed tool, carefully remove two seals 28
from housing 26. Note the direction the seals were
installed.
10. Loosen but do not remove four capscrews 1. Loosen
screws evenly in the order of A, B, C and D Figure 9-27
until spring pre-load is released.
11. Remove capscrews 1 Figure 9-26, lockwashers 2, cover
3 and gasket 23. Using a thin blade screw driver, remove
seal 4 from cover 3.
12. Remove belleville springs 5 and if present, washer 6.
When removing the belleville springs take note of the
stacking sequence.
13. Remove piston 9 from housing 26 bore. Remove O-ring
11 and backup ring 10 from the piston. Push rod 12
should also come out with piston 9.
14. Remove piston 15 from housing 26 bore. Remove O-
rings 13 and 16 and backup rings 14 and 17 from piston
15.
15. Remove lining and piston assembly 22 from housing 26
bore. Holding assembly on a flat surface, separate lining
20 and piston 19
by removing two flat head screws 21
.
Remove O-rings 18 from piston 19.
16. Loosen vice jaws and rotate the brake so that the disc
clearance slot is facing upward. Remove pan head
screws 27, lining 25 and bushings 24 from housing 26.
17. Lubricate all rubber components (NOT THE BRAKE
LININGS) in clean hydraulic oil. Use the same type as
used in the hydraulic system.
18. Clean all parts (EXCEPT LININGS) and housing bore
thoroughly with a suitable solvent and then coat them
with clean hydraulic oil of the same type used in the
hydraulic system. Keep all parts free of contaminants,
dirt and debris.
NOTE: Coat the surfaces indicated Figure 9-26 with a
Lithium Base, E.P. No. 2 bearing grease or
equivalent.
19. Install new lining 25 Figure 9-26 in housing 26 using new
bushings 24 and pan head screws 27. Tighten the
screws to 2.5 - 3.3 Nm (22-28 lb-in).
20. Install new lining 20 on piston 19 using new flat head
screws 21. Tighten screws to a torque of 3.4 - 4.5 Nm
(30-40 lb-in). Install new O-rings 18 on piston 19 and
insert lining and piston assembly 22 into housing 26
bore.
21. Carefully install two new seals 28 in housing 26. Be sure
to install the seals the same direction as they were
removed.
22. Install bleed screw 30. Tighten to a torque of 12.2 - 20.3
Nm (9-15 lb-ft).
23. Install new O-rings 13 and 16 and new backup rings 14
and 17 on piston 15. Be sure they are installed in the
correct order.
24. Install piston 15 into housing 26 bore. Be sure piston is
installed in the correct direction. Be careful not to pinch
the O-rings on the inlet ports.
25. Install new backup ring 10 and new O-ring
11 on piston
9.
Be sure they
are installed in the proper order. Install
push rod 12 in bore of piston 9. Install piston into
housing 26 bore.
26. Fully lubricate the threads of adjusting screw 7 and lock
nut 9 and install into cover 3.
27. Install washer 6, if used, and new belleville springs 5
over end of piston 9. Follow the stacking sequence
Figure 9-28.
WARNING
Cap (3) is under spring pressure. Use care when
removing the cap to prevent personal injury.
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