Hitachi ZAXIS 135US-6 class Operator's Manual page 494

Hydraulic excavator

Table of Contents

Check Track Sag --- every 50 hours

Swing the upperstructure 90 ° and lower the bucket to raise

the track off the ground as shown.

Keep the angle between the boom and arm 90 to 110 ° and

position the bucket's round side on the ground. Place blocks

under the machine frame to support the machine.

Rotate the raised track in reverse two full rotations and then

forward two full rotations.

Measure distance (A) at the middle of the track frame from

the bottom of the track frame to the back face of the track

Track sag specifications

NOTE: Check track sag after thoroughly removing soil stuck

on the track area by washing.

Adjust Track Sag

Precautions for Adjusting Track Sag

1. If track sag is not within specifications, loosen or tighten

the track following the procedures shown on the next

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

3. After adjusting track sag of both tracks, move the

machine back and forth several times.

4. Check track sag again. If track sag is not within

specifications, repeat adjustment until correct sag is

OPTIONAL ATTACHMENTS AND DEVICES

PAD CRAWLER SHOE

250 to 280 mm

300 to 335 mm

340 to 380 mm