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MAINTENANCE
METHOD FOR RELEASING PRESSURE IN HYDRAULIC CIRCUIT
•
The hydraulic system is always under internal pressure. Before checking or replacing the pipes and
hoses, release the pressure from the circuit. If the internal pressure has not been released, the high
pressurized oil may spout out and it may cause serious personal injury or death.
•
Immediately after the engine is stopped, its parts and oil are still very hot and may cause burn in-
jury. Wait for the temperature to go down, and then start the work.
•
If the oil filler cap is removed without releasing the internal pressure, oil will spurt out, so turn the
oil filler cap slowly to release the internal pressure, then remove it carefully.
NOTICE
Finish the steps of operating the blade control lever fully forward and backward, and to the right and left
within 15 seconds after the engine has stopped.
1.
Stop the machine.
Place the machine on a firm, level ground.
2.
Lower the work equipment to the ground and stop the engine.
3.
Turn the starting switch to ON position.
4.
Set the work equipment lock lever to FREE position.
5.
Operate the blade control lever fully forward, backward, to the right, and left to release the pressure from
the hydraulic circuit.
6.
Set the work equipment lock lever to LOCK position.
7.
Loosen oil filler cap (F) slowly on the top of the hydraulic
tank to release the internal pressure in the hydraulic tank.
METHOD FOR CHECKING ELECTRICAL INTAKE AIR HEATER
Check before starting in the cold weather (once a year).
Ask your Komatsu distributor for check of the electrical intake air heater.
METHOD FOR ADJUSTING SHIMS AT CENTER BALL
Place the work equipment lock lever at LOCK position except when operating the blade for adjustment.
The shim adjustment of the center ball portion is required in the following cases.
•
When a play is found at the center ball portion
•
When the blade is assembled again after it has been removed for transportation
If it is not adjusted, the blade response to the operation becomes worse, and soil and sand enter and cause
premature wear or damage of the ball.
Adjust as follows.
•
Correct value for play at ball joint: 0.2 to 1.2 mm
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WARNING
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WARNING
MAINTENANCE PROCEDURE
4-37
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