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MAINTENANCE
SERVICE PROCEDURE
CHECK ACCUMULATOR FUNCTION
Check the gas pressure of the accumulator as follows.
CHECKING
1.
Stop the machine on level ground and apply the parking brake.
2.
Raise the work equipment to the maximum height, then place the lift arm control lever at HOLD.
3. Leave the work equipment in this position, and stop the engine.
4.
Confirm that it is safe around the machine, then set the lift arm
at FLOAT and lower the work equipment to a position 1 m (3.28
ft) from the ground.
5.
When the work equipment reaches a position 1 m (3.28 ft) from
the ground, move the lift arm control lever to LOWER, and
lower the work equipment slowly to the ground.
If the work equipment stops moving during the inspection, the
gas pressure may be below the service limit (0.69 MPa (7
kg/cm
2
, 99.4 PSI), so contact your Komatsu distributor to have
the gas pressure measured or gas charged.
Carry out the checks within five minutes of stopping the engine. If the machine is left with the engine stopped, the
accumulator pressure will drop and it will be impossible to carry out the check.
CHECK ACCUMULATOR GAS PRESSURE
Please contact your Komatsu distributor to have the gas pressure checked when making periodically replacement
of safety parts or carrying out the legally required 2000 hour or every year service.
CHECK INJECTOR
Check the exhaust gas color visually. If there is any abnormality in the exhaust gas color, please contact your
Komatsu distributor for inspection or replacement. For details of the action to take if there is an abnormality, see
ENGINE (PAGE 3-102) "Exhaust gas occasionally turns black".
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