Repair Kit Installation - Manitowoc Grove 5540F Service Manual

5540F/YB5515 SERVICE MANUAL

Repair Kit Installation

The parking brake has a repair kit available. It includes all the
parts necessary to rebuild the brake. These parts are
indicated in Figure 9-28 with a
WARNING
Before repairing the parking brake, make sure that the
machine is on level ground. Place chocks on both sides of
th e f ou r ti r e s . R em ov e t he ig ni t io n k e y. If th es e
precautions are not adhered to, the crane could run you
over while performing the repair.
NOTE: When removing seals and backup rings be careful
not to scratch or mar the pistons.
NOTE: The new linings must be kept free of grease, oil,
etc.
1. Close the needle valve located under the accumulator
Figure 9-11. This will shut off hydraulic pressure to the
parking brake. 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 9-28 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 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.
GROVE
symbol.
Published 10-21-2010, Control# 198-04
WARNING
Cap (3) is under spring pressure. Use care when
removing the cap to prevent personal injury.
10. Loosen but do not remove four capscrews 1. Loosen
screws evenly in the order of A, B, C and D Figure 9-29
until spring pre-load is released.
a0783
11. Remove capscrews 1 Figure 9-28, 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
FIGURE 9-29
9
9-15