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24.2.4 CHECK AND ADJUST TRACK TENSION
Carry out this operation with two workers. The operator must
move the machine in accordance with the signals from the other
worker. The track tension is checked with the chassis raised, so
it extremely dangerous if the machine is lowered by mistake dur-
ing the inspection. Never move the machine while anyone is car-
rying out measurements.
The wear of pins and bushings on the undercarriage will vary with the
working conditions and soil properties. 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
1.
Raise the chassis with the boom and arm.
When doing this, operate the levers slowly.
2.
Measure the clearance between the bottom of the track frame and
the top of the track shoe at a position that is safe even if the chassis
should come down
Standard clearance: 331 ± 20 mm. (13.0 ± 0.8 in)
*
Places to measure
PC290LC, PC290NLC: 4
WARNING
th
track roller from sprocket.
24. SERVICE PROCEDURE
3-37
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