Komatsu PC18MR-3, Operation & Maintenance Manual

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MAINTENANCE PROCEDURES
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249
4.9.9.d NITROGEN LOADING PRESSURE CHECK IN THE ACCUMULATOR
(FOR THE CONTROL CIRCUIT)
WARNING
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The accumulator is loaded with high pressure nitrogen; therefore, an incorrect operation may cause an
explosion with consequent serious injuries or damage. When handling the accumulator, always proceed
as indicated below.
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Hydraulic circuit pressure cannot be completely eliminated. When the hydraulic equipment is removed,
do not stand in the oil jet outlet direction. Moreover, loosen the bolts slowly during this operation.
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Do not remove the accumulator;
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Do not bring the accumulator near sparks or naked flames.
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Do not make holes in the accumulator, do not weld or use oxyhydrogen flames.
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Do not hit or press the accumulator.
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The gas must be released when disposing of the accumulator. Refer to your Komatsu Distributor to have
this operation carried out.
IMPORTANT
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If the nitrogen loading pressure in the accumulator is low and operation continues, it will be impossible
to release the pressure remaining inside the hydraulic circuit in case of a machine failure.
ACCUMULATOR OPERATION
The accumulator stores the pressure in the control circuit. Even
when the engine is stopped, the control circuit can be enabled
and the following operations are activated.
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If the control lever is activated to lower the working tool, the lat-
ter may descend because of its own weight.
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Hydraulic circuit pressure can be released.
NOTE
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This function is only available when the start-up key is in (ON)
position and the safety device lever is in working position (F).
The accumulator is fitted in the position illustrated in the diagram
on the right.