Pinion Gear Depth
GENERAL INFORMATIONPinion Gear ID Numbers:
Ring and pinion gears are supplied as matched sets only. The identifying numbers for the ring and pinion gear are marked on the face of each gear. A plus (+) number, minus (-) number or zero (0) is marked on the face of the pinion gear. This number is the amount (in thousandths of an inch) the depth varies from the standard depth setting of a pinion marked with a (0). The standard depth provides the best teeth contact pattern. Refer to Backlash and Contact Pattern Analysis Paragraph in this section for additional information.
Shim Locations:
Compensation for pinion depth variance is achieved with select shims. The shims are placed under the rear pinion bearing cone.
If a new gear set is being installed, note the depth variance marked on both the original and replacement pinion gear. Add or subtract the thickness of the original depth shims to compensate for the difference in the depth variances. Refer to the Depth Variance charts.
Note where Old and New Pinion Marking columns intersect. Intersecting figure represents plus or minus amount needed.
Note the marked number on the face of the drive pinion gear (-1, -2, 0, +1, +2, etc.). The numbers represent thousands of an inch deviation from the standard. If the number is negative, add that value to the required thickness of the depth shim(s). If the number is positive, subtract that value from the thickness of the depth shim(s). If the number is 0 no change is necessary. Refer to the Pinion Gear Depth Variance Chart.
PINION DEPTH MEASUREMENT AND ADJUSTMENT
1. Install front bearing cup. Use Installer D-129 and Handle C-4171.
2. Install rear bearing cup. Use Installer C-4310 and Handle C-4171.
9 1/4 Axle Pinion Adjustment Tools:
3. Use Pinion Gear Adjustment Gauge Set C-758-D6.
4. Position Spacer SP-6017 over Shaft SP-526.
5. Position pinion rear bearing on shaft.
6. Position tools (with bearing) in the housing.
7. Install Sleeve SP-1730.
8. Install pinion front bearing.
9. Install Spacer SP-6022.
10. Install Sleeve SP-535A, Washer SP-534, and Nut SP-533.
11. Tighten the nut to seat the pinion bearings in the housing. Allow the sleeve to turn several times during tightening to prevent brinelling bearing cups or bearings.
PINION GEAR DEPTH VARIANCE
12. Loosen the compression nut tool.
13. Lubricate the pinion gear front and rear bearings with gear lubricant.
14. Re-tighten the compression nut tool to 1 - 3 Nm (15-25 inch lbs.) torque.
15. Rotate the pinion gear several complete revolutions to align the bearing rollers.
Gauge Block:
16. Install Gauge Block.
17. Install Gauge Block SP-6020 at the end of SP-526.
18. Install Cap Screw SP-536 and tighten with Wrench SP-531.
Crossbore Arbor:
19. Position Crossbore Arbor SP-6018 in the differential housing.
20. Center the tool.
21. Position the bearing caps on the arbor tool.
22. Install the attaching bolts.
23. Tighten the cap bolts to 14 Nm (10 ft. lbs.).
Depth Shim(s) Selection:
24. Trial fit depth shim(s) between the crossbore arbor and gauge block. The depth shim(s) fit must be snug but not tight (drag friction of a feeler gauge blade).
25. Select a shim equal to the shim selected above plus the drive pinion gear depth variance number marked on the face of the pinion gear using the opposite sign on the variance number. For example, if the depth variance is -2, add +0.002 inch to the dial indicator reading.
NOTE: Depth shims are available in 0.001-inch increments from 0.020 inch to 0.038 inch.
26. Remove the tools from the differential housing.