Hydraulic System - Doosan DX700LC Operation And Maintenance Manual

Problem
Engine knocks, runs
unevenly or surges.
Engine has poor power.
Engine runs hot.

HYDRAULIC SYSTEM

Problem
None of the controls
function (loud noise from
pumps).
None of the controls
function (no noise from
pumps).
Troubleshooting
Cause
Low engine oil.
Plugged air intake system.
Injection pump out of adjustment.
Plugged fuel filter.
Water or dirt in fuel system.
Clogged or dirty fuel injectors.
Plugged air intake system.
Clogged or dirty fuel injectors.
Fuel filters plugged.
Engine speed control cable out of
adjustment.
Injection pump out of adjustment.
Valve backlash faulty.
Low coolant level.
Thermostat faulty.
Radiator cap faulty.
Radiator core plugged.
Oil cooler core plugged.
Fan belt loose or damaged.
Temperature sensor faulty.
Cause
Hydraulic pump failed.
Low hydraulic oil level.
Suction line plugged or damaged.
Pilot pump failure.
Cut off solenoid valve failed.
Pilot cutoff switch is ON.
Remedy
Refill.
Clean system and replace filter.
Contact your DOOSAN dealer.
Replace fuel filter.
Clean system and add new fuel.
Clean injectors.
Clean system and replace filter.
Clean injectors.
Replace filters.
Readjust.
Contact your DOOSAN dealer.
Adjust backlash.
Add coolant.
Replace thermostat.
Replace radiator cap.
Clean radiator.
Clean oil cooler.
Tighten or replace as required.
Replace sensor.
Remedy
Contact your DOOSAN dealer.
Add hydraulic oil as required.
Clean or replace as required.
Contact your DOOSAN dealer.
Replace solenoid.
Adjust pilot cutoff switch clearance.
OP000030
6-3