Hitachi Zaxis 33U-5A, Operator'S Manual

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MAINTENANCE
7-83
Check Track Sag (Steel Crawler) (Optional)
--- every 50 hours
Swing the upperstructure 90 ° and lower the bucket to raise
the track off the ground as shown. Measure distance (A) at the
middle of the track frame from the bottom of the track frame
to the back face of the track shoe.
Each time, be sure to place blocks under the machine frame to
support the machine.
d
CAUTION: To prevent accidents, care should be taken
to ensure that hands, feet, and any body parts do not
become entangled when working around the tracks.
Model Appropriate sag A (mm)
ZX33U-5A, 38U-5A 120 to 140 mm (4.7 to 5.5 in)
ZX48U-5A, 55U-5A, 65USB-5A 140 to 160 mm (5.5 to 6.3 in)
f
NOTE: Check track sag after thoroughly removing soil stuck
on the track area by washing.
Adjust Track Sag
1. If track sag is not within specifications, loosen or tighten
the track following the procedures shown on the next
page.
2. When adjusting track sag, lower the bucket to the
ground to raise one track off the ground. Repeat this
procedure to raise the other track. Each time, be sure to
place blocks under the machine frame to support the
machine. To prevent accidents, care should be taken
to ensure that hands, feet, and any body parts do not
become entangled when working around the tracks.
3. After adjusting both side track sags, rotate the tracks
backward and forward to equalize both side track sags.
4. Recheck the track sag once more. Readjust as necessary.
M1M7-04-006
A
M588-07-062