Komatsu PC490LC User Manual

Grease fitting (2) forms one part with plug (1).
2.
To check if the tension is correct, run the engine at low
idle, move the machine slowly forward (by an amount
equal to the length of track on ground), then stop the ma-
chine.
3.
Check the track tension again, and if the tension is not cor-
rect, adjust it again.
4.
Grease can be pumped in until dimension (S) becomes
0 mm. If the track tension is still loose, the pins and bush-
ings are excessively worn. The pins and bushings must be
inverted or replaced. Ask your Komatsu distributor for re-
pair.
METHOD FOR DECREASING TRACK TENSION
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WARNING
Never loosen plug (1) more than 1 turn.
If it is loosened more than 1 turn, there is a danger of plug
(1) flying out under the high internal pressure of the
grease.
Never loosen any part other than plug (1). Never put your
face in the mounting direction of plug (1).
1.
Loosen plug (1) gradually to release the grease.
2.
If the grease does not come out smoothly, move the machine forward and backward a short distance.
3.
Tighten plug (1).
4.
To check if the tension is correct, run the engine at low idle, move the machine slowly forward (by an
amount equal to the length of track on the ground), then stop the machine.
5.
Check the track tension again, and if the tension is not correct, adjust it again.
If the track tension cannot be decreased by the above procedure, ask your Komatsu distributor for repair.
METHOD FOR REPLACING BUCKET TEETH (VERTICAL PIN TYPE)
Replace the bucket teeth before the adapter starts to wear.
kk
WARNING
• It is dangerous if the work equipment moves by mistake when the tooth is being replaced.
Set the work equipment in a stable condition, set the lock lever securely to LOCK position and stop
the engine.
• As the pin is driven out with strong force, it is dangerous that the pin may fly out. Check that there
is no people in the surrounding area.
• Broken pieces may fly during the replacement work, so always wear the protective equipment such
as protective eyeglasses and gloves.
MAINTENANCE MAINTENANCE PROCEDURE
4-27

Komatsu PC490LC Specifications

General

Brand	Komatsu
Model	PC490LC
Category	Excavators
Language	English