Hitachi ZX27U-2, Operator'S Manual

Page: 174 / 230

MAINTENANCE
7-54
Adjust Track Sag (rubber crawler) and Check
for Damage
--- daily
Proper track sag adjustment is necessary to extend the
service life of the rubber track and the travel device.
Check Track Sag
As illustrated to the right, raise the one side track which
sag is to be measured, off the ground. Place blocks un-
der machine frame to support the machine. Rotate the
rubber track so that the track joint is positioned at the
upper center of the track. Measure distance (A) from the
bottom of the lower roller tread to the inner ridge of the
rubber track.
Dimension
Track Sag Specifications A in mm
(in.) 10 to 15
(0.39 to 0.59)
Adjusting Track Sag
1. If track sag is not within specifications, loosen or
tighten the track following the procedures shown on
the next page.
2. Before adjusting track sag, lower the bucket and
blade to the ground to raise both tracks off the ground.
Be sure to place blocks under machine frame to
support the machine.
3. After adjusting track sag of both tracks, run the tracks
back and forth several times to equalize the track sag
on both side tracks.
4. After doing so, check track sag again. If track sag is
not within specifications, repeat adjustment until the
correct sag is obtained.
Check Rubber Track for Damage
Check the rubber track for damage. If any, consult your
authorized dealer for repair.
M1M7-04-006
M588-07-055
M102-07-075
M503-05-050
Joint
Joint
Roller
A
Track Sag (rubber crawler)
Side a