4-39
4.12.8
RELEASING INTERNAL PRESSURE IN HYDRAULIC SYSTEM
Before replacing the front attachment or the hydraulic piping, release the internal pressure of the hydraulic system.
Release the internal pressure of the hydraulic system following the next steps.
RELEASING INTERNAL PRESSURE IN HYDRAULIC SYSTEM
Immediately after operation, there is a hazard of getting burn by heated parts. Wait until the temperatures decrease
before starting works.
1.
Move the machine to a level and firm place.
2.
Retract the arm cylinder and bucket cylinder, and
place the bucket on the ground.
3.
Start the engine.
4.
Release the internal pressure referring to
"PRESSURE RELEASE" in Paragraph "SETTING
MENU SCREEN" in Chapter 2.
When internal pressure releasing is started,
"DRAINING HYD. PRESS." is displayed on the monitor and the engine speed is reduced to a low speed.
5.
The buzzer sounds intermittently.
(To stop the buzzer, push the buzzer stop switch).
6.
In this condition, move the control levers of the attachment/equipment to release the pressure.
Be cautious that the attachment/equipment may move due to its own weight.
7.
Set the starter key to "OFF" to stop the engine and to finish releasing the internal pressure.
After turning the key OFF and finishing the internal pressure releasing, wait 5 minutes or more before turning the
key ON again.
If the key is turned ON again soon after the key OFF, it may cause the internal pressure releasing to finish
improperly, resulting in continued releasing operation.
• When releasing the internal pressure is failed,
"FAIL DRAIN HYD. PRESS" is displayed on the
monitor, and the buzzer sounds continuously. In
that case, turn the starter key "OFF", wait 5 minutes or more, and then perform procedures 4. to 7. again.
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