Handling Of Accumulator - Doosan DX140R Operation & Maintenance Manual

HANDLING OF ACCUMULATOR

AVOID DEATH OR SERIOUS INJURY
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 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.
• Move safety lever to "LOCK" position after stopping
engine.
• DO NOT mishandle accumulator(s). They are very
dangerous because
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. Park machine on firm and level ground. Lower the front
attachment to the ground and stop engine.
2. Move safety lever to "RELEASED" position.
3. Turn starter switch to "I" (ON) position.
4. Fully stroke work and travel levers in all directions.
5. Move safety lever to "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
4-78
WARNING
they contain high-pressure
Figure 126
FG014444
DX140R/DX140LCR