HYDRAULIC SYSTEM 5540F/YB5515 SERVICE MANUAL
4-6 Published 10-21-2010, Control# 198-04
Table 4-4
Outrigger Circuit Troubleshooting
Table 4-5
Main Winch Circuit Troubleshooting
Problem Possible Cause Remedy
No movement all cylinders Dirt in relief valve keeping the valve off
the valve seat.
Clean the relief valve.
Relief valve setting too low. Check and adjust the relief valve
setting.
Faulty pump section. Overhaul or replace the pump.
Slow movement all outriggers. Low engine rpm. Increase engine speed.
Leakage in relief valve. Clean or replace the relief valve.
Slow movement, one cylinder. Internal leakage in the cylinder Replace piston seals.
Outrigger lowers but will not raise. Faulty lock valve in base of the cylinder Replace counterbalance valve.
Outrigger cylinder does not hold under
load.
Leakage in counterbalance valve in
base of cylinder.
Clean or replace counterbalance
valve.
Internal leakage in cylinder. Replace piston seals.
Outriggers only on one side. Faulty control valve section. Repair or replace valve section.
Faulty selector valve. Replace selector valve.
Restriction or dirt between the O/R
valve spool and housing.
Remove and clean the outrigger valve
spool.
Problem Possible Cause Remedy
Winch will not lift maximum (rated)
load, considerable reduction in line
speed.
Faulty load sense relief valve. Replace the relief valve.
Dirt in load sense relief valve, keeping
the valve off the valve seat.
Remove and clean the relief valve.
See Main Relief and Port Relief
Valves.
Not enough oil from the pump. Check hoses and lines for
restrictions to or from pump.
Improper primary pump pressure. Check and adjust pressures.
Malfunction or damage to winch
components.
Check and overhaul the winch, if
necessary. See Structurals, Chapter
11. Check for binding or damaged
sheaves.
Internal leakage in the winch motor. Replace the winch motor.
Raise speed is slower than lowering
speed.
Restriction in hose to control valve. Check and repair.
Faulty counterbalance valve. Replace the counterbalance valve.
Motor will not hold the load when the
control lever is in neutral — load drops
rapidly.
Overload condition. Decrease the load.
Faulty counterbalance valve. Replace the counterbalance valve.
Motor will not hold the load when the
control lever is in neutral — load
drifts down slowly.
Overload condition. Decrease the load.
Faulty counterbalance valve. Replace the counterbalance valve.
Winch does not move. Restriction in holding valve cartridge. Clean or replace the holding valve
cartridge.
Brake not releasing. Check condition of the brake. Repair
is necessary.
Low pilot pressure. Check and adjust.
Reference Only
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