PL61 Pipelayer Caterpillar

Check

Illustration 1	g06043143

Check the track adjustment. Check for wear and for excessive dirt buildup.

If tracks are too tight, wear of the components will accelerate. If tracks are too loose, wear of the components will accelerate.

1. Move the machine forward for a distance of two times the length of the machine. Slowly reduce the machine to zero speed with the travel control pedal. Shut off the engine.

2. Stand on the track between the front idler and the track carrier roller to produce as much track sag as possible.
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   Illustration 2	g06011931

3. Measure the track sag at (A) on each track.

   1. Place a tight string or a straight edge on top of the grousers between the front carrier roller and front idler. Measure distance (A) from the straight edge to the grouser tip directly between the front idler and the front carrier roller.

4. Dimensions (A) should be 50 ± 10 mm (2.0 ± 0.4 inch).

If the track appears to be too tight or too loose, proceed to "Track Adjustment".

Track Adjustment

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Do not remove any parts until all pressure has been relieved to avoid possible personal injury. Relieve pressure by opening relief valve one turn maximum. See maintenance guide for track adjustment procedure.

Loose Track Adjustment

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Illustration 3	g06243370

1. Open the Valve cover.
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   Illustration 4	g06265551

2. Add MPGM through track adjustment valve (1). Add MPGM until dimension (A) and (B) is correct.

3. Operate the machine back and forth to equalize the pressure. Allow the machine to coast to a complete stop. do not use the brake.

4. Remeasure dimension (A) and dimension (B), as needed.

   Reference: See Operation and Maintenance Manual, "Front Idler Position - Check" for additional information on System One undercarriage.

Tight Track Adjustment

1. Open the Valve cover.

2. Rotate relief valve (2) counterclockwise to allow the grease to escape.

3. Close the relief valve when dimension (A) and dimension (B) are correct.

4. Install the access cover.