ENGINE AR 9Y4718 - Caterpillar

Illustration 34 g03870871
The bearing cups have adjusting rings (22). Adjusting rings (22) are used for setting the bearing end play and for setting the back lash of the bevel gear. Remove bolt (20) and lock (21) from adjusting ring (22). Repeat for the opposite side.
Illustration 35 g03866014
Ensure that bolts (23) for bearing caps (24) are tightened to a torque of 25 N m (221 lb in).
Move both adjusting rings to a position that maintains gear backlash, but not a tight gear mesh. Make sure to maintain a slight bearing end play.
Illustration 36 g03872142
Position the differential and bevel gear so that pinion shaft (14) is in a vertical position. Install a suitable bolt in pinion shaft (14). Use Tooling (P) to tighten the bolt until pinion shaft (13) turns.
Measure the overall rolling torque of the differential and the pinion shaft. Record that number.
Advance the adjusting ring that is next to the bevel gear while you oscillate the bevel gear to a zero backlash position. Then, back off the adjusting ring to the nearest lock position (a maximum of one lug on the adjusting ring).
Advance the adjusting ring that is opposite the bevel gear while you rotate the bevel gear set. Monitor the torque that is required to rotate the pinion shaft until a torque is registered over the torque measured in Step 39.e.
This position is the seated position. Advance the adjusting ring and rotate the bevel gear until the overall rolling torque is 1.20 to 2.48 N m (11 to 22 lb in) above the rolling torque achieved in Step 31.b.
Illustration 37 g03871700
(14) Pinion shaft
Measure the backlash in three equally spaced positions around bevel gear (48). If any of the three measurements are not equal to the specified backlash of 0.36 0.12 mm (0.014 0.005 inch), then retract the adjusting rings or advance the adjusting rings equally to preserve the preload. Repeat this Step until the backlash at all three locations is 0.36 0.12 mm (0.014 0.005 inch).
Check the tooth contact between the pinion shaft and the bevel gear.
Illustration 38 g03871429
(48) Bevel gear
To check the tooth contact between pinion shaft (14) and bevel gear (48), coat bevel gear (48) with a suitable rouge compound in three locations that are 120 degrees apart, as indicated by Locations (X) ( Y), and (Z).
Illustration 39 g02659550
Acceptable tooth contact pattern
Rotate the pinion shaft in both directions. The acceptable bevel gear contact pattern percentages are 60 percent from heel for convex, and 55 percent from heel for concave. Refer to Illustration 39.
Illustration 40 g03871720
Unacceptable tooth contact pattern
Illustration 41 g03871722
Unacceptable tooth contact pattern
Inspect the tooth contact pattern. If the tooth contact pattern appears like the tooth contact pattern in Illustration 40, then some shims will need to be added and the tooth contact pattern will need to be rechecked. If the tooth contact pattern appears like the tooth contact pattern in Illustration 41, then some shims will need to be removed.Note: If the shims are adjusted, repeat Step 35 through Step 39.m.
Illustration 42 g03869469
Illustration 43 g03866014
Use Tooling (N) to tighten bolts