PIN-YM 3933685 - Caterpillar

Grease is under high pressure.Grease coming out of the relief valve under pressure can penetrate the body causing injury or death.Do not watch the relief valve to see if grease is escaping. Watch the track or track adjustment cylinder to see if the track is being loosened.Loosen the relief valve only one turn.
Introduction
The sag in the track must be maintained. The following test procedure will verify whether the sag in the track is within the specified limit.Test Procedure
Illustration 1 g00040335
Do not attempt to tighten track when dimension (1) is 150 mm (5.9 inch) or more.Contact your Caterpillar dealer for track service or instructions.
Follow these steps in order to adjust the tension of the track:
Move the machine forward. Allow the machine to stop without the use of the service brakes. Adjust the tracks while you are in the machine's typical operating conditions. If packing conditions prevail in the workplace, adjust the tracks with packing material on the tracks.
Make sure that the sag in the track is between the sprocket and the front idler. Park the machine and shut off the engine.
Establish a straight line from the grouser at the sprocket to the grouser at the front idler. See Illustration 2.
Illustration 2 g00040329
If a machine does not have track carrier rollers, the sag in the track is measured between the sprocket and front idler (2). The correct adjustment of dimension (2) is 115 10 mm (4.5 0.4 inch).
Illustration 3 g00104000
If the machine is equipped with track carrier rollers, calculate the average of dimension (3) and dimension (4). The correct average value is 55 10 mm (2.2 0.4 inch).Loose Track Adjustment
Remove the access cover.
Illustration 4 g00104001
Add multipurpose grease (MPGM) through track adjustment valve (5). Add the MPGM until dimension (2) is correct.
Operate the machine back and forth in order to equalize the pressure. Allow the machine to coast to a complete stop. Do not use the brakes.
Measure dimension (2) again. Repeat Steps 2 and 3 until dimension (2) is correct.
Install the access cover.Tight Track Adjustment
Illustration 5 g00104002
Remove the access cover.
Loosen relief valve (6) by one turn of 360 degrees. Allow the grease to escape.
Close the relief valve. Tighten the valve to a torque of 34 7 N m (25 5 lb ft).
Add MPGM through track adjustment valve (5). Add grease until dimension (2) is correct.
Operate the machine back and forth in order to equalize the pressure. Allow the machine to coast to a complete stop. Do not use the brakes.
Measure dimension (2) again. Repeat Steps 4 and 5 until dimension (2) is correct.
Install the access cover.Bolt Torque for Track Shoes
The torque requirement for track shoe bolts is 400 70 N m (300 50 lb ft). Tighten the bolts by an additional turn of 120 degrees. If you are using bolts with a master link, tighten the bolts to a torque of 400 70 N m (300 50 lb ft). Then, tighten the bolts by an additional turn of 180 degrees.