Komatsu PC490LC User Manual

8.
Loosen oil filler cap (F) slowly on the top of the hydraulic
tank to release the internal pressure in the hydraulic tank.
9.
Check that the hydraulic oil temperature is low.
10.
Remove the 2 plugs at the outlet and inlet.
Be careful not to get any dirt or mud on the hose fitting.
If an O-ring is damaged, replace it with a new one.
11.
Connect the hose on the attachment side.
Check the direction of flow of the oil and be careful not to
make any mistake.
12.
Rotate the rotor of the stop valve installed to the piping for
the inlet port and the outlet port on the side face of the arm
to FREE position (F).
13.
Check the oil level in the hydraulic tank.
For details, see “METHOD FOR CHECKING OIL LEVEL
IN HYDRAULIC TANK, ADDING OIL (3-149)”.
METHOD FOR OPERATING ATTACHMENT
kk
WARNING
If the travel pedals are operated when the engine speed is decreased by the auto-deceleration function,
the engine speed will suddenly increase. Be careful.
If you perform operations with your foot on the pedal, the attachment may suddenly move if you de-
press the pedal by mistake, and this may lead to serious personal injury or death. Do not rest your foot
on the pedal except when you need to operate the pedal.
When the attachment is not used, set the lock pin of the pedal to LOCK position to prevent the pedal
from being operated.
For the change of the flow setting for the breaker mode and attachment mode for the crusher, etc., see “MA-
CHINE SETTINGS (3-68)”.
METHOD FOR OPERATING BREAKER
NOTICE
When performing breaker operations, use the breaker mode. If the breaker is used without using the
breaker mode, the breaker may be damaged.
Breaker can be operated using either the breaker switch or attachment control pedal.
(1) Breaker Switch:
1.
Set the working mode to B mode.
2.
Press switch to operate breaker and release to stop.
When operating breaker using breaker switch, lock the
pedal with the lock pin to avoid accidental operation.
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT ATTACHMENTS AND OPTIONS
6-24

Komatsu PC490LC Specifications

General

Brand	Komatsu
Model	PC490LC
Category	Excavators
Language	English