Independent Outrigger Circuit - Manitowoc Grove CD3340B Service Manual

CD3340B/YB4411

Independent Outrigger Circuit

Table 4-5
Symptom
No movement, all outriggers
No movement, rear outriggers
No movement, front outriggers
Slow movement, all outriggers
Slow movement, one outrigger
Outrigger extends but does not
retract, or vice versa
Outrigger lowers but will not
raise, or vice versa
Outrigger vertical cylinder does
not hold under load
Outrigger only on one side
operates
GROVE
Possible Cause
Electrical problem.
Dirt in dump valve, keeping the valve off
the valve seat.
Faulty pump section.
Electrical problem.
Dirt in relief valve, keeping the valve off of
the valve seat.
Relief valve setting too low.
Electrical problem.
Dirt in relief valve, keeping the valve off of
the valve seat.
Relief valve setting too low.
Low engine RPM.
Leaking in dump valve.
Solenoid valve on outrigger valve section
not fully actuating the valve spool.
Internal leakage in cylinder.
Problem in electrical circuit.
Problem in electrical circuit.
Faulty counterbalance valve in base of the
cylinder.
Leakage in counterbalance valve in base
of the cylinder.
Internal leakage in cylinder.
Faulty solenoid valve or open circuit to
solenoid valve.
Restriction or dirt between the outrigger
valve spool and housing.
Faulty selector switch.
Published 04/07/2015 Control # 569-00
HYDRAULIC SYSTEM
Remedy
See Electric System, page 3-1.
Clean or replace dump valve.
Overhaul or replace the pump.
See Electric System, page 3-1.
Clean the relief valve.
Check and adjust the relief valve setting.
See page 4-20.
See Electric System, page 3-1.
Clean the relief valve.
Check and adjust the dump valve setting.
See page 4-20.
Increase engine speed.
Clean or replace the dump valve.
Check for restriction or binding in the
solenoid valve.
Replace the piston seals.
See Electric System, page 3-1.
See Electric System, page 3-1.
Replace the counterbalance valve.
Clean or replace the counterbalance
valve.
Replace the piston seals.
See Electric System, page 3-1.
Remove and clean the valve spool.
Replace.
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