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4-52 Inspection, Maintenance and Adjustment
022-00029AE Operation and Maintenance Manual
HANDLING OF ACCUMULATOR
Release pilot accumulator pressure using the
following procedure;
1.
Lower front attachment (bucket) on the
ground.
2.
Stop the engine.
3.
Set pilot cutoff switch on "I" (ON) position.
4.
Turn starter switch "ON."
5.
Fully move pilot control valve lever in all
directions.
6.
Repeatedly press brake until brake oil
pressure warning light turns "ON." Press
the pedal another eight to nine times.
7.
Set pilot cutoff switch on "O" (OFF)
position.
8.
Remove accumulator by unscrewing it
slowly.
WARNING!
Even though the engine is stopped, the hydraulic accumulators for the pilot system are still
charged. Do not disconnect any pilot system hoses until accumulator pressure has been
released from the circuit. To release pressure, turn the starter switch to “I” (ON) position and
operate pilot control valve lever and brake pedal. Even though the engine is shutdown hydraulic
actuated components may move while releasing pilot pressure. Keep all personnel away from
machine while performing this operation.
•
Set pilot cutoff switch to "O" (OFF) position after stopping engine.
•
DO NOT mishandle accumulator(s). They are very dangerous because they contain
high pressure nitrogen gas.
•
DO NOT punch a hole or apply heat or fire to an accumulator.
•
DO NOT weld on accumulator, or try attaching anything to it.
•
When replacing an accumulator, contact a
DOOSAN
distributor or sales agency so the
gas can be properly released.
•
Wear safety goggles and protective gloves when working on an accumulator.
Hydraulic oil under pressure can penetrate the skin and cause serious injuries.
Figure 92