Manitowoc Grove CD3340B User Manual

HYDRAULIC SYSTEM CD3340B/YB4411
4-8
Published 04/07/2015 Control # 569-00
Standard Outrigger Circuit Troubleshooting
Table 4-4
Symptom Possible Cause Remedy
No movement, all outriggers
Electrical problem.
Dirt or restriction in the dump valve.
Dirt in relief valve, keeping the valve off the
valve seat.
Relief valve setting too low.
Faulty pump section.
See Electric System, page 3-1.
Clean or replace the dump valve.
Clean the relief valve.
Check and adjust the relief valve setting.
See page 4-20.
Overhaul or replace the pump.
Slow movement, all outriggers
Low engine rpm.
Leakage in relief valve.
Increase engine speed.
Clean or replace the relief valve.
Slow movement, one cylinder
Solenoid valve on outrigger valve section
not fully actuating the valve spool.
Internal leakage in the cylinder.
Check for restriction or binding in the
solenoid valve.
Replace piston seals.
Outrigger extends but does not
retract, vice versa
Problem in electrical circuit. See Electric System, page 3-1.
Outrigger lowers but will not
raise, or vice versa
Problem in electrical circuit.
Faulty counterbalance valve in base of the
cylinder.
See Electric System, page 3-1.
Replace the counterbalance valve.
Outrigger vertical cylinder does
not hold under load
Leakage in counterbalance valve in base
of the cylinder.
Internal leakage in cylinder.
Clean or replace the counterbalance
valve.
Replace the piston seals.
Outriggers operate only on one
side
Faulty solenoid valve or open circuit to
solenoid valve.
Restriction or dirt between the outrigger
valve spool and housing.
Faulty selector switch.
See Electric System, page 3-1.
Remove and clean the valve spool.
Replace.
Reference Only

Manitowoc Grove CD3340B Specifications

General

Brand	Manitowoc
Model	Grove CD3340B
Category	Construction Equipment
Language	English