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18. OUTLINES OF SERVICE
18.3
OUTLINE OF HYDRAULIC SYSTEM
•
During operation and immediately after operation is ended, the temperature of the hydraulic system still re-
mains high.
In addition, high hydraulic pressure is applied to the system. Take care when inspecting and maintaining the
hydraulic system.
° Stop the machine on level ground, lower the bucket to the ground, then set so that there is no pressure
applied to the cylinder circuit.
° Always stop the engine.
° Immediately after operations, the hydraulic oil and lubricating oil are at high temperature and high pressure,
so wait for the oil temperature to go down before starting maintenance.
Even when the temperature goes down, the circuit may still be under internal pressure, so when loosening
the plug or screw, or the hose joint, do not stand in front of the part. Loosen it slowly to release the internal
pressure before removing it.
° When carrying out inspection or maintenance of the hydraulic circuit, always bleed the air from the
hydraulic tank to remove the internal pressure.
•
Periodic maintenance includes the inspection of the hydraulic oil level, replacement of the filter and refilling of
hydraulic oil.
When the high pressure hose, etc. is removed, check the O-ring for damage. If necessary, replace it.
•
After the hydraulic filter element and strainer are cleaned or replaced, or after the hydraulic system is repaired
or replaced or the hydraulic piping is removed, bleed air from the hydraulic circuit.
•
The accumulators are charged with high-pressure nitrogen gas. Incorrect handling may be dangerous. For the
handling procedure, see 11.19 "Handling the accumulator".
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