ROTATING GP -A 5401234 - Caterpillar

Track - Check
Illustration 1 g02064178Check 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.Note: Loss of Nitrogen (N2) charge in the recoil system may cause additional loosening of the track. This pressure may be retained inside the track roller frame. Take caution when removing the track adjust cover.
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.
Stand on the track between the front idler and the track carrier roller in order to produce as much track sag as possible.
Illustration 2 g01872513
Measure the track sag in two places on each track.
Place a tight string or a straight edge on top of the grousers between the carrier roller and front idler. Measure distance (A) from the straight edge to the grouser tip at the lowest point of sag.
Place a tight string or a straight edge on top of the grousers between the two carrier rollers. Measure distance (B) from the straight edge to the grouser tip at the lowest point of sag.
Total the two measurements. The total correct adjustment of the dimensions is 50 mm (2.0 inch) to 65 mm (2.60 inch).
Refer to Table 1 in order to determine the correct sag.
Table 1
D7E Track Sag (Range)
Location D7E D7E LGP
Front (A) 35 mm (1.4 inch) to 45 mm (1.8 inch) 25 mm (1.0 inch) to 30 mm (1.2 inch)
Center (B) 15 mm (0.6 inch) to 20 mm (0.8 inch) 25 mm (1.0 inch) to 35 mm (1.4 inch)
Total (A + B) 50 mm (2.0 inch) to 65 mm (2.6 inch) 50 mm (2.0 inch) to 65 mm (2.6 inch) If the track appears to be too tight or too loose, proceed to “Track Adjuster and Recoil System - Check/Adjust” in this manual.