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MAINTENANCE
SERVICE PROCEDURE
CHECK AND ADJUST TRACK TENSION
The wear of pins and bushings on the undercarriage will vary with the working conditions and types of soil. It is thus
necessary to continually inspect the track tension so as to maintain the standard tension.
Carry out the check and adjustment under the same conditions as when operating (on jobsites where the track
becomes clogged with mud, measure with the track clogged with mud).
INSPECTION
Stop the machine on level ground (stop with the transmission in
FORWARD without applying the brake). Then place a straight bar
on the track shoes between the carrier roller and the idler as shown
in the figure, and measure the clearance between the bar and the
grouser at the midpoint. If the clearance (A) is 20 to 30 mm (0.79
to 1.18 in), the tension is standard.
If the track tension is not at the standard value, adjust it in the
following manner.
ADJUSTMENT
WARNING
Grease inside adjusting mechanism is under high pressure. Grease
coming from lubricator (1) under pressure can penetrate the body causing
injury or death.
For this reason, do not loosen lubricator (1) more than one turn. Do not
loosen any part other than lubricator (1). Furthermore, do not get any part
of your body in front of the grease fitting.
If the track tension is not relieved by this procedure, please contact your
Komatsu distributor.
WHEN INCREASING TENSION
1. Pump in grease through grease fitting with a grease pump.
2.
To check that the correct tension has been achieved, move the machine backwards and forwards.
3.
Check the track tension again, and if the tension is not correct, adjust it again.
4. Continue to pump in grease until (S) becomes 0 mm. If the
tension is still loose, the pin and bushing are excessively worn,
so they must be either turned or replaced. Please contact your
Komatsu distributor.
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