Manitowoc Shuttlelift CD5515-2 Service And Maintenance Manual

GROVE Published 1-20-2017, Control# 483-02 4-5
CD5515-2/YB5515-2 SERVICE MANUAL HYDRAULIC SYSTEM
4
Table 4-2
Lift Circuit Troubleshooting
Table 4-3
Telescope Circuit Troubleshooting
Difficult to engage valve spools. Dirt or foreign material between spool
and valve bore.
Remove and clean valve spool and
bore.
Broken spring (spool return). Replace spring.
Distortion or damage to valve spool. Replace valve section.
Problem Possible Cause Remedy
Problem Possible Cause Remedy
Lift cylinder does not extend or retract. Control valve not actuated. See Difficult to Engage Valve Spools.
Not enough oil from pump to operate
the cylinder.
See Loss of Movement During
Operation.
Bad leak in hydraulic swivel. Replace seals.
Load sense relief valve held open by
dirt on valve seat.
Disassemble and clean or replace the
load sense relief valve.
Cylinder extends, but does not retract. Malfunction in holding valve. Replace the holding valve. DO NOT
ADJUST.
Restriction in hose to control valve. Check and correct.
Cylinder retracts but does not extend. Malfunction in anti-double blocking
electrical system.
See Electric System.
Bad cartridge in anti-double blocking
solenoid valve.
Replace cartridge.
Restriction in pilot control line to control
valve.
Locate and repair.
Faulty controller. Repair or replace.
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
Cylinder will not extend the boom
under load.
Restriction in boom sections. Clean and apply lubricant to boom
slides. See Chapter 5, 1.
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
Reference Only

Manitowoc Shuttlelift CD5515-2 Specifications

General

Brand	Manitowoc
Model	Shuttlelift CD5515-2
Category	Construction Equipment
Language	English