Manitowoc Grove CD3340B User Manual

GROVE 4-9
CD3340B/YB4411 HYDRAULIC SYSTEM
4
Published 04/07/2015 Control # 569-00
Independent Outrigger Circuit
Table 4-5
Symptom Possible Cause Remedy
No movement, all outriggers
Electrical problem.
Dirt in dump valve, keeping the valve off
the valve seat.
Faulty pump section.
See Electric System, page 3-1.
Clean or replace dump valve.
Overhaul or replace the pump.
No movement, rear outriggers
Electrical problem.
Dirt in relief valve, keeping the valve off of
the valve seat.
Relief valve setting too low.
See Electric System, page 3-1.
Clean the relief valve.
Check and adjust the relief valve setting.
See page 4-20.
No movement, front outriggers
Electrical problem.
Dirt in relief valve, keeping the valve off of
the valve seat.
Relief valve setting too low.
See Electric System, page 3-1.
Clean the relief valve.
Check and adjust the dump valve setting.
See page 4-20.
Slow movement, all outriggers
Low engine RPM.
Leaking in dump valve.
Increase engine speed.
Clean or replace the dump valve.
Slow movement, one outrigger
Solenoid valve on outrigger valve section
not fully actuating the valve spool.
Internal leakage in cylinder.
Check for restriction or binding in the
solenoid valve.
Replace the piston seals.
Outrigger extends but does not
retract, or 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.
Outrigger only on one side
operates
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