GROVE 9-5
CD3340B/YB4411 BRAKE SYSTEM
Published 04/07/2015 Control # 569-00
Parking Brake Adjustment
When the parking brake is engaged and it will not hold the
crane in position it may be necessary to adjust the parking
brake disc pads.
1. Shut off the engine and place chock blocks in front and
behind all four wheels. Release the parking brake.
Check that the brake moves freely on the guide/slide
pin.
2. Loosen the lock nut and adjusting screw (Figure 9-6).
3. Place a 0.030 mm (0.012 in) feeler gauge between the
disc and one of the linings.
4. Tighten the adjusting screw until is just possible to
remove the feeler gauge.
5. Tighten the jam nut while holding the adjusting screw
with a wrench. Remove the feeler gauge.
6. Engage the parking brake. Then, release the parking
brake and recheck that the brake moves freely on the
guide/slide pin.
Accumulator Charging
The accumulator must be charged with NITROGEN. Do not
use compressed air. Remove the rubber cap over the
charging valve on top of the accumulator and install nitrogen
charging apparatus. Charge the accumulator to 5171 ± 275
kPa (750 ± 40 psi).
TESTS
Brake Piston Seal Leakage Test
The following test procedure explains how to check if a brake
piston is severely damaged/destroyed or if the seals have a
small cut or nick. The test procedure must only be done
when the axle is COLD.
NOTE: Before working on the brake system make sure the
machine is on level ground and chock all four
wheels.
NOTE: Do not drive the machine with any part of the brake
system disconnected. When the test has been
completed, reconnect all brake lines and bleed the
brake system using recommended procedures,
page 9-4.
WARNING
Before adjusting the parking brake, make sure that the
machine 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 adjustment.
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