Manitowoc Grove 5540F Service Manual

GROVE Published 10-21-2010, Control# 198-04 4-5
5540F/YB5515 SERVICE MANUAL HYDRAULIC SYSTEM
4
Table 4-3
Telescope (Crowd) Circuit Troubleshooting
Boom moves slowly downward when
control valve is in NEUTRAL position.
Internal leakage in cylinder. Replace piston seals.
Leakage in holding valve. Replace holding valve. DO NOT
ADJUST.
Faulty controller. Repair or replace.
Broken centering spring in control
valve section.
Replace broken spring.
Problem Possible Cause Remedy
Problem Possible Cause Remedy
Cylinder will not extend the boom
under load.
Restriction in boom sections. Clean and apply lubricant to boom
slides. See Preventative Maintenance,
Chapter 5.
Load too heavy. Reduce load.
Faulty pump. Overhaul or replace.
Leakage in hydraulic swivel. Replace seals in the swivel.
Load sense relief valve malfunction. Check load sense relief pressure.
Dirt or restriction in main relief. Disassemble the relief valve and
clean.
Boom extends, but will not retract. Restriction in hose to the control valve. Check and correct.
Malfunction in the holding valve. Replace the holding valve. DO NOT
ADJUST
Boom retracts but will not extend Malfunction in anti-double blocking
electrical system.
See Electric System.
Bad cartridge in anti-double blocking
solenoid valve.
Replace the cartridge
Restriction in pilot control line to control
valve.
Check and correct.
Faulty controller. Repair or replace control valve.
Boom slow at extending. Restriction in boom sections. Clean and lubricate boom slides. See
Preventative Maintenance, Chapter 5.
Reference Only

Manitowoc Grove 5540F Specifications

General

Brand	Manitowoc
Model	Grove 5540F
Category	Construction Equipment
Language	English