CD5515-2/YB5515-2 SERVICE MANUAL
9-14 Published 1-20-2017, Control# 483-02
PARKING BRAKE REPAIR
Lining Kit Replacement
NOTE: The new linings must be kept free of grease, oil,
etc.
The lining kit is indicated in Figure 9-26 with a
symbol.
1. Release system pressure by actuating the service brake
pedal until no resistance is felt. Then, engage and
disengage the parking brake to release its pressure.
2. Slowly, loosen the hydraulic hose from the parking
brake. Some pressure may still be present in the
hydraulic hose. Let the pressure escape and then
remove the hydraulic hose.
3. Cap the hydraulic hose to prevent contamination from
entering the hydraulic system.
4. Loosen lock nut 8 Figure 9-26 and back off adjusting bolt
7.
5. Remove the bolts and nuts used to fasten the brake
mounting bracket assembly to the crane. Remove the
parking brake.
6. Separate the mounting bracket assembly 31 from the
brake assembly.
7. Clamp the brake in a vice with soft jaws with the
clearance slot facing straight up.
NOTE: Clamping should be done on sides of the brake, not
on machined surfaces.
8. Remove two screws 27 through access holes in housing
26. Using a thin blade tool, pry lining 25 from housing 26
and remove the lining and two bushings 24 through the
disc clearance slot.
9. Rotate lining assembly 22 until screws 21 are aligned
with the access holes in housing 26. Remove the two flat
head screws 21. Pry lining 20 from piston 19 and
remove the lining through the disc clearance slot.
10. Install new lining 20 into piston 19 through the disc
clearance slot. Install new flat head screws 21 and
tighten to a torque of 3,4 - 4,5 Nm (30-40 lb-in).
11. Insert new bushings 24 into new lining 25. Install the
new lining into housing 26 through the disc clearance
slot. Line up the holes with the housing and fasten with
two new screws 27. Tighten to a torque of 2,5 - 3,2 Nm
(22-28 lb-in).
12. Assemble the brake assembly onto mounting bracket
31. Install the parking brake assembly onto the frame of
the crane. Attach the hydraulic hose.
13. Adjust the lining clearance as described on page 9-7.
14. Open the accumulator needle valve and then bleed air
from the system as described on page 9-6.
NOTE:
The needle valve must be in the open position for
the
brake s
ystem to operate properly. If it is not
open, the charging pump will cycle every time the
brake pedal is depressed and if the crane’s engine
stops there may not be enough pressure to stop
the crane.
WARNING
Before replacing the parking brake linings, make sure that
the crane is on level ground. Place chocks on both sides
of the four tires. Remove the ignition key. If these
precautions are not adhered to, the crane could run you
over while performing the repair.
Reference Only
To Next Page
Loading...
Need help?
General
