Maintenance
Safety, Operation and Maintenance Manual - Aug 2012
5-42
SY115C9/135C/155H Crawler Hydraulic Excavator
5.8.2.4 Track tension - inspect/adjust
The wear of undercarriage pin rolls and pin
bushings may vary according to operating
condition and soil type. Therefore, the ten-
sion of track shall be checked often in order to
maintain standard tension.
Always prepare your machine as required
and lock/tag it out before proceeding.
See
“Preparing the machine” on page 2-58 and
“Lock-out and tag-out” on page 2-60.
Inspection
1. Run the engine at low idle speed. Travel
the machine forward a distance that is
equivalent to the length of an unfolded
track. Park your machine.
2. Place a straight edge on top of the track
grousers between the idler (1) and the
carrier roller (2), as shown in the right
illustration.
3. Measure the maximum amount of sag in
the track. The sag is measured from the
highest point of the track grouser to the
bottom of the straight edge.
The standard value of sag (a) should be10
- 30 mm (0.4 -1.2in).
1
2
3
a
CZ335-1104016
Fig. 5-25