Doosan DX700LC Operation And Maintenance Manual page 278

Swing Motor
IMPORTANT
If the air is not vented from the system, it will cause damage
to the swing motor and bearings.
NOTE:
Perform this only when oil has been drained from
swing motor.
1. Shut down engine.
2. Disconnect drain hose and fill swing motor case with
hydraulic oil.
3. Connect the drain hose.
4. Start engine and set throttle at "LOW IDLE" and swing
upper structure slowly two full revolutions to the left and
right.
Travel Motor
NOTE:
Perform this only when oil is drained from travel
motor
1. Shut down engine
2. Disconnect drain hose (Figure 157) and fill motor case with
hydraulic oil.
3. Connect drain hose.
4. Start engine and set engine speed control dial to "LOW
IDLE". Run the engine for one minute and slowly drive
excavator forwards and backwards.
General Venting
1. After venting air from all components, shut the engine
down and check the hydraulic oil level. Fill hydraulic oil
tank to "H" mark on sight gauge.
2. Start engine and operate all controls again, run engine for
five minutes to ensure all systems have been vent and
purged of air. Set engine speed to "LOW IDLE", and check
hydraulic oil level again. Add oil as necessary.
3. Check for oil leaks and clean all fill and venting locations.
Inspection, Maintenance and Adjustment
4-90
Figure 156
Figure 157
FG016142
FG016143
OP001123