6-4 Troubleshooting 022-00029AE Operation and Maintenance Manual
All actuators have low power Low hydraulic oil level Add hydraulic oil as required
Suction filter clogged Clean filter
Hydraulic pumps faulty Contact your DOOSAN dealer
Main relief pressure too low Contact your DOOSAN dealer
Hydraulic pumps cavitating Bleed air from hydraulic pumps
Only one or two actuators have
little or no power
Overload relief pressure too low Reset pressure
Make-up check valve leaking Clean or replace as required
Control valve spool faulty Replace valve spool
Dirt in valve spool Clean or replace as required
Actuator failed Repair or replace as required
Cylinder seal failed Repair or replace as required
Cylinder rod damaged Repair or replace as required
Remote control valve failed Replace control valve
Wrong pilot line connection Reconnect pilot lines
Oil temperature too high Debris in exterior of cooler Clean exterior of cooler
Oil cooler faulty Contact your DOOSAN dealer
Fan belt loose Tighten fan belting as required
Actuators on one side of boom
have little power or do not
operate
Overload relief valve is not
operating properly
Repair valve or replace
Damaged hydraulic hose Replace hose
Loose hydraulic fittings Tighten fittings
Internal damage to control valve
housing
Replace control valve
Control valve spool damaged Replace control valve
Sediment inside control valve Clean and repair valve
Check valve internal leakage Repair or replace valve
Damaged cylinder or pump Repair or replace pump or
cylinder
Cylinder internal leakage Repair or replace cylinder
Damaged cylinder rod Replace rod
Pilot valve failure Replace pilot valve
Problem Possible Causes Remedies
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