Handling Of Accumulator - Doosan DX700LC Operation And Maintenance Manual

HANDLING OF ACCUMULATOR

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 the "I" (ON) position and
operate all hydraulic control levers and forward/reverse
travel levers. Even though the engine is shutdown hydraulic
actuated components may move while releasing pilot
pressure. Keep all personnel away from excavator while
performing this operation.
• Set safety lever on "LOCK" 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.
Release pilot accumulator pressure using the following
procedure;
1. Position the machine on firm, level ground. Lower the front
attachment to the ground and shut down engine.
2. Set safety lever on "RELEASED" position.
3. Turn starter switch to the "I" (ON) position.
4. Fully stroke work and travel levers in all directions.
5. Set safety lever on "LOCK" position.
6. Turn key to "O" (OFF) position and remove from starter
switch.
7. Remove accumulator by unscrewing it slowly.
Inspection, Maintenance and Adjustment
4-86
WARNING
Figure 151
FG016144
OP001123