MAINTENANCE 7 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. 90 to 110° M104-07-067 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. 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 page. M107-07-068 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. 3. After adjusting track sag of both tracks, move the ma- chine back and forth several times. 4. Check track sag again. If track sag is not within specifica- tions, repeat adjustment until correct sag is obtained.
7-84 Model Dimension A ZAXIS400R-3 340 to 380 mm (13.4 to 15.0 in) ZAXIS400LCH-3 380 to 430 mm (15.0 to 17.0 in)