Manitowoc Grove 5540F Service Manual page 312

PROBLEM
Charging valve actuates every time
foot pedal is pressed.
Parking brake will not release.
_Parking brake will not hold.
9-20
POSSIBLE CAUSE
1. Accumulator needle valve closed.
2. Loss of nitrogen in accumulator.
3. Insufficient hydraulic pressure in
accumulator.
1. Faulty solenoid valve.
2. Loss of fluid from broken line,
loose fitting or hose.
3. Faulty priority flow control valve.
4. Faulty parking brake switch.
5. Loose electrical connections.
6. Faulty pump section.
1. Improperly adjusted
brake.
2. Severely worn brake linings.
3. Faulty parking brake assembly.
Published 10-21-2010, Control# 198-04
5540F/YB5515 SERVICE MANUAL
REMEDY
1. Open needle valve.
2. Charge accumulator.
3. Faulty accumulator
valve. Replace.
1. Replace solenoid valve.
2. Check all circuit lines, hoses and
fittings. Tighten or replace.
3. Replace.
4. Replace switch.
5. Check and tighten.
6. Replace pump.
parking 1. Adjust brake lining clearance.
2. Replace brake linings.
3. Repair or replace.
charging