OP000509
4-77
Inspection, Maintenance and Adjustment
HANDLING OF ACCUMULATOR
Release pilot accumulator pressure using the following
procedure:
1. Lower front attachment (bucket) to ground.
2. Shut down engine.
3. Set pilot cutoff switch on "I" (ON) position.
4. Turn starter switch to "I" (ON) position.
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. Turn key to "O" (OFF) position and remove from starter
switch.
9. 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 shut down, 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.
FG008106
Figure 113
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