MAINTENANCE SERVICE PROCEDURE
4-25
CHECK 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 30mm (0.79 to 1.18in), the tension is standard.
If the track tension is not at the standard value, adjust it in the
following manner.
ADJUSTMENT
WARNING
Grease inside the adjusting mechanism is under high
pressure. Grease coming from lubricator(1) under pres-
sure 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). Fur-
thermore, do not bring your face in front of the grease fit-
ting.
If the track tension is not relieved by this procedure,
please contact your Komatsu distributor.
WHEN INCREASING TENSION
Prepare a grease gun.
1. Pump in grease through the 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 0mm. 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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