Doosan DL220 - Page 236

OP000040Troubleshooting
6-4
Only one or two actuators
have little or no power.
Overload relief pressure too low. Reset pressure.
Makeup 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 DO OSAN
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 Cause Remedy