Komatsu PC450-8 Operation & Maintenance Manual page 249

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Increasing Track Gauge

1. Remove center frame mounting bolts (1) (front + rear: each

4 bolts) from the front and rear of the track frame on the

side to be extended.

2. Swing the upper structure to the opposite side to where the

track frame gauge is to be increased, set it at 90° to track

frame (2), then use the work equipment to jack up the track

Height (H) of the track frame being raised should be less than

50 mm. Take care not to raise the track frame so much that the

stopper bolt is distorted.

3. Using the arm, pull the machine to the front.

The track frame will slide.

4. Extend the track frame until it comes into contact with the

stopper, then lower the machine slowly to the ground.

Install bolts (1) (front + rear: each 9 bolts) and tighten to

specified torque.

Tightening torque: 1520 - 1910 Nm

(155 - 195 kgm)

5. Follow the same procedure to retract the track frame on

the other side.

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