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MAINTENANCE
CHECK AND TIGHTEN TRACK SHOE BOLTS
If the machine is used with track shoe bolts (1) loose, they will
break, so tighten any loose bolts immediately.
Tightening
Track shoe
1. First tighten to a tightening torque of 490 ± 49 N·m (361.4 ± 36.1 lbf-ft) then check that the nut and shoe are in
close contact with the link contact surface.
2. After checking, tighten a further 120° ± 10°.
Order for tightening
Tighten the bolts in the order shown in the diagram on the right.
After tightening, check that the nut and shoe are in close con-
tact with the link mating surface.
CHECK AND ADJUST TRACK TENSION
For details of starting the engine and operating the work equipment, see "BEFORE STARTING ENGINE (
3-64 )", "STARTING ENGINE ( 3-77 )", "AFTER STARTING ENGINE ( 3-81 )", and "WORK EQUIPMENT
CONTROLS AND OPERATIONS ( 3-96 )" in the OPERATION section.
Wear on pins and bushings of the undercarriage will vary with working conditions and a type of soil, so inspect the
track tension every now and then in order to maintain the standard tension.
For carrying out inspection and adjustment of track shoes, park the machine on the flat and solid ground.
Checking
1. Run the engine at low idling, then travel the machine for-
ward for a distance equal to the track length on ground and
stop the machine slowly.
2. Put on the track shoe straight wooden bar (3) which
stretches from idler (1) to upper carrier roller (2).
3. Measure the maximum deflection between the bottom sur-
face of the wooden bar and the top surface of the track
shoe.
Deflection a should be 10 to 30 mm (0.4 to 1.2 inches).
If the track tension is not at the standard value, adjust it in the following manner.
WARNING
.MAINTENANCE PROCEDURE
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4-25
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