Service and maintenance
Track slack 197
Track slack
Inspecting and adjusting the track slack
Check the slack every 100 hours.
WARNING!
When two persons are working, the operator should follow
the sign of the maintenance worker.
For inspecting the track tension, the track must be lifted off
the ground.
Be very careful that the machine does not drop or move
while measuring.
The degree of wear condition of track link pins and bushings varies
with the working condition or the characteristics of soil. Check the
track slack often and keep to specified value.
When working in wet sand or clay, it sticks to and packs between
moving undercarriage components. This can prevent mating parts
from properly engaging each other, causing interference and high
loads. Due to abrasive particles in the material it significant!y ac-
celerates wear rates of the sprockets, pins
I
bushings, idlers and
track links as the track load and tension increase. Generally, pack-
ing effects cannot be controlled except by constant cleaning Ire-
moval of the material.
Therefore thoroughly clean the undercarriage at least daily or
more often according to job-site soil conditions.
Inspection
1 Raise the track by using boom and arm. For this movement,
operate the lever slowly.
2 Measure (L), the clearance between the bottom of track frame
and the upper surface of track shoe.
Adjust the track slack according to the soil characteristics.
The standard track slack according to the soil characteristics.
Working condition
L: Clearance (mm)
General soil
320
— 340
Rocky ground
300
— 320
Moderate soil like gravel, sand,
snow, etc.
340
— 360
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