GROVE 9-11
CD3340B/YB4411 BRAKE SYSTEM
Published 04/07/2015 Control # 569-00
5. Remove the bolts and nuts used to fasten the brake
mounting bracket to the crane. Remove the parking
brake assembly.
6. Separate the mounting bracket (31, Figure 9-10) 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. Using a sharp bladed tool, carefully remove two seals
(28) from housing (26). Note the direction the seals were
installed.
NOTE: Cap (3) is under spring pressure. Use care when
removing the cap to prevent personal injury.
9. Loosen but do not remove four capscrews (1). Loosen
screws evenly in the order of A, B, C and D as shown in
Figure 9-11 until spring preload is released.
10. Remove capscrews (1), lockwashers (2), cover (3) and
gasket (23). Using a thin blade, remove seal (4) from
cover (3).
11. Remove belleville springs (5) and if present, washer (6).
When removing the belleville springs take note of the
stacking sequence.
12. Remove piston (9) from housing (26) bore. Remove O-
ring (11) and back-up ring (10) from piston. Push rod
(12) should also come out with piston (9).
13. Remove piston (15) from housing (26) bore. Remove O-
rings (13 and 16) and back-up rings (14 and 17) from
piston (15).
14. Remove lining and piston assembly (22) from housing
(26) bore. Remove O-rings (18) from the lining and
piston assembly.
15. Lubricate all rubber components in clean hydraulic oil.
Use the same type as used in the hydraulic system.
KEEP THE LININGS FREE OF OIL, GREASE AND
SOLVENTS.
16. Clean all parts 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 in Figure 9-10 with a
Lithium Base, E.P. No. 2 bearing grease or
equivalent.
17. Install new O-rings (18) on lining and piston assembly
(22) and insert the assembly into housing (26) bore.
18. Carefully install two new seals (28) in housing (26). Be
sure to install the seals the same direction as they were
removed.
19. Install new O-rings (13 and 16) and new back-up rings
(14 and 17) on piston (15). Be sure they are installed in
the correct order.
20. Install piston (15) into housing (26) bore. Be sure piston
is installed in the correct direction. Be careful not to
pinch the O-ring on the inlet ports.
21. Install new back-up 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.
22. Fully lubricate the threads of adjusting screw (7) and
lock nut (8) and install into cover (3).
NOTE: Completely lubricate belleville springs with a light
coat of Lithium Base, E.P. No. 2 bearing grease.
23. Install washer (6), if used, and belleville springs (5) over
end of piston (9). Follow the stacking sequence shown in
Figure 9-12.
24. Install new seal (4) in cover of (3). Be sure inside of
cover is coated with grease.
25. Install new gasket (23), cover (3), lockwashers (2) and
capscrews (1). Tighten the screws evenly in the order of
A, B, C and D as shown in Figure 9-11. When installed,
tighten each screw to a torque of 29.8-36.6 Nm (22-27
lb-ft).
26. Assemble the brake assembly onto the mounting
bracket (31).
27. Install the parking brake assembly onto the frame of the
crane.
28. Attach the hydraulic hose.
29. Adjust the lining clearance as described on page 9-5.
30. Open the
accumulator
needle valve and then bleed air
from the system as described on page 9-4.
NOTE: The needle valve must be in the open position for
the brake system 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.
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