TRACK GP 3830819 - Caterpillar

Illustration 1 g01379564
Typical example
Before the bevel gear group is installed in the carrier, tighten nut (5) on pinion shaft (1). Check the torque that is needed in order to turn the pinion shaft. Refer to Table 2 for the proper rolling torque for the pinion shaft .
Tighten nut (5) or loosen nut (5) on pinion shaft (1) until the torque that is needed to turn the pinion shaft is achieved .
Install the bevel gear group in the carrier. Install the caps for the carrier bearings.
Install the adjusting nuts. Tighten the cap bolts for the carrier bearings to 100 N m (74 lb ft).
Put the carrier in a position so that the centerline for the axle is vertical and bevel gear (3) is on the bottom.
Rotate bevel gear (3). Turn in adjusting nut (4) until you achieve backlash of 0 mm (0 inch). Back out nut (4) to the nearest lock position.
Advance adjusting nut (2) in order to remove any end play. Rotate gear (3) and tighten nut (2) until a heavy drag is felt. Release the tension from the adjusting nut. Finger tighten the nut in order to remove end play from the assembly.
Make an adjustment to nut (4) in order to adjust the backlash. Refer to Table 2 for the backlash value. Adjust nut (2) in order to remove any end play.
Tighten nut (2) in order to preload the bearings. Use a dial indicator to ensure that the bearing cone moves. Refer to Table 2 for the preload.
After the backlash and preload have been adjusted, check the torque that is needed in order to turn the pinion shaft. Refer to Table 2 for the proper rolling torque for the pinion shaft.
The contact pattern between the pinion shaft and bevel gear must be checked. Apply marking compound to three teeth that are adjacent to the bevel gear.
Rotate the pinion shaft for several revolutions in one direction. Rotate the pinion shaft for several revolutions in the opposite direction. Turn the pinion shaft in one direction until the teeth that are marked can be viewed.
Illustration 2 g00101201
The correct area of tooth contact starts near the inside end of the teeth of the bevel gear. The maximum correct area of tooth contact is half the length of the teeth. See Illustration 2 for an example of the correct area of tooth contact.
Illustration 3 g00101202
If the tooth contact looks like the contact pattern in Illustration 3, proceed to Step 16.
Illustration 4 g00101203
If the tooth contact looks like the contact pattern in Illustration 4, proceed to Step 18.
Remove some of the shims from the pinion housing. Recheck the backlash between the bevel gear and the pinion. Refer to Table 2 for the backlash values. Note: Make sure that the backlash adjustment is correct before an adjustment is made to the area of tooth contact. Several adjustments to the backlash and tooth contact may be necessary to get the correct adjustments. Always remember that a change to gear clearance (backlash) will also change the gear contact. A