Track Tension - Doosan DX700LC Operation And Maintenance Manual

TRACK TENSION

Safely measuring track tension requires two people. One
person must be in the operator's seat, running the controls
to keep one side frame in the air, while the other person
makes dimensional checks. Take all necessary precautions
to make sure the machine won't move or shift position
during service. Warm up the engine to prevent stalls, travel
the excavator to an area that provides level, uniform ground
support and/or use support blocks when necessary.
The track adjusting
high-pressure. NEVER release pressure too suddenly. The
grease cylinder valve should never be backed off more than
one complete turn from the fully snugged down position.
Bleed off pressure slowly and keep your body away from
the valve at all times.
Track shoe link pins and bushings wear with normal usage,
reducing track tension. Periodic adjustment is necessary to
compensate for wear and it may also be required by working
conditions.
1. Track tension is checked by jacking up one side of the
excavator. See Figure 152. Place blocking under frame
while taking measurement.
2. Measuring the distance (A, Figure 153) between the
bottom of the side frame and the top of the lowest crawler
shoe. Recommended tension for operation over most
types of terrain is 380 - 430 mm (14.96 - 16.93 in)
NOTE: This measurement can be thrown off if there is
too much mud or dirt or other material in the
track assembly. Clean off the tracks before
checking clearance.
3. Too little sag in the crawler track (less than 380 mm
(14.96 in) clearance) can cause excessive component
wear. The recommended adjustment can also be too tight
causing accelerated stress and wear if ground conditions
are wet, marshy or muddy, or if the ground is hard and full
of rocks or gravel.
Inspection, Maintenance and Adjustment
WARNING
mechanism is under very
Figure 152
Figure 153
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A
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OP001123
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