Accumulator The pilot control system is equipped with an accumulator. For a brief period of time after the engine has been shut down, the accumulator will store a pressure charge that may enable hydraulic controls to be activated. Activation of any controls may enable the selected function to operate under force of gravity. When performing maintenance on the pilot control system, the hydraulic pressure in the system must be released as describe in "Handling of Accumulator" in the Operation and Maintenance Manual. The accumulator is charged with high-pressure nitrogen gas, so it is extremely dangerous if it is handled in the wrong way. Always observe the following precautions:
Do not drill or make any holes in the accumulator or expose it any flame, fire or heat source. Do not weld on the accumulator, or try attaching anything to it. When carrying out disassembly or maintenance of the accumulator, or when disposing of the accumulator, the charged gas must be properly released. Contact your DOOSAN distributor. Wear safety goggles and protective gloves when working on an accumulator. Hydraulic oil under pressure can penetrate the skin and cause serious injuries. Indoor Ventilation Engine exhaust gases can cause fatal accidents, and unconsciousness, loss of alertness, judgement and motor control and serious injury.
Make sure there is adequate ventilation before starting the engine in any enclosed area. You should also be aware of open windows, doors or ductwork into which exhaust may be carried, or blown by the wind, exposing others to danger. ARO1770L Figure 11 SP000014 Page 21 Track Excavator Safety