022-00029AE Operation and Maintenance Manual Safety 1-19
ATTACHMENT PRECAUTIONS
Options kits are available through your dealer. Contact DOOSAN for information on available one-way
(single-acting) and two-way (double-acting) piping / valving / auxiliary control kits. Because DOOSAN
cannot anticipate, identify or test all attachments that owners may wish to install on their machines, please
contact DOOSAN for authorization and approval of attachments, and their compatibility with options kits.
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” on page 4-52.
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.
ENGINE VENTILATION
Engine exhaust gases can cause loss of
judgment, loss of alertness, and loss of motor
control. These gases can also cause
unconsciousness, serious injury and fatal
accidents.
Make sure of adequate ventilation before
starting 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 wind, exposing others to
danger.
ARO1770L
Figure 13
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