Adjustment

DIFFERENTIAL ASSEMBLY


Adjustment


TOTAL PRELOAD TORQUE
- Before inspection and adjustment, drain gear oil.
1. Rotate drive pinion back and forth 2 to 3 times to check for unusual noise and rotation malfunction.





2. Rotate drive pinion at least 20 times to check for smooth operation of the bearing.
3. Measure total preload with preload gauge (A) [SST:
ST3127S000 (J-25765-A)].

Standard
Total preload torque : Refer to "Preload Torque". Preload Torque


NOTE:
Total preload torque = Pinion bearing preload torque + Side bearing preload torque
- If measured value is out of the specification, disassemble it to check and adjust each part. Adjust the pinion bearing preload and side bearing preload.
Adjust the pinion bearing preload first, then adjust the side bearing preload.

When the preload torque is large
On pinion bearings: Decrease the drive pinion bearing adjusting washer and drive pinion adjusting washer thickness.
On side bearings: Increase the side bearing adjusting shim thickness. For select parts refer to parts information.

When the preload torque is small
On pinion bearings: Increase the drive pinion bearing adjusting washer and drive pinion adjusting washer thickness.
On side bearings: Decrease the side bearing adjusting shim thickness. For select parts refer to parts information.

SIDE BEARING PRELOAD
- Before inspection and adjustment, drain gear oil.
1. Remove carrier cover and side retainer. Refer to Disassembly.
2. Make sure all parts are clean. Also, make sure the bearings are well lubricated with gear oil.





3. Place the differential case assembly into gear carrier.
4. Install side bearing adjusting shim before disassembling or shim which thickness is the same as the one before disassembling.





5. Install side retainer assembly to gear carrier.

CAUTION:
Never install O-ring.





6. Install side retainer mounting bolts to the specified torque.
7. Measure the turning torque of the gear carrier at the drive gear mounting bolts with a spring gauge [SST: -- (J-8129)].






Specification : 34.2 - 39.2 N (3.5 - 4.0 kg, 7.7 - 8.8 lb) of pulling force at the drive gear bolt

8. If the turning torque is outside the specification, use a thicker/thinner side bearing adjusting shim to adjust.






If the turning torque is less than the specified range: Decrease the side bearing adjusting shim thickness.
If the turning torque is greater than the specification: Increase the side bearing adjusting shim thickness.

9. Record the total amount of shim thickness required for the correct carrier side bearing preload.

DRIVE GEAR RUNOUT
1. Remove carrier cover. Refer to Disassembly.





2. Fit a dial indicator to the drive gear back face.
3. Rotate the drive gear to measure runout.

Limit
Drive gear runout : Refer to "Drive Gear Runout". Drive Gear Runout

- If the runout is outside of the repair limit, check drive gear assembly condition; foreign material may be caught between drive gear and differential case, or differential case or drive gear may be deformed, etc. CAUTION:
Replace drive gear and drive pinion gear as a set.

TOOTH CONTACT
Before inspection and adjustment, drain gear oil.
1. Remove carrier cover. Refer to Disassembly.





2. Apply red lead to drive gear.

CAUTION:
Apply red lead to both the faces of 3 to 4 gears at 4 locations evenly spaced on drive gear.





3. Rotate drive gear back and forth several times, check drive pinion gear to drive gear tooth contact.

CAUTION:
Check tooth contact on drive side and reverse side.










4. If tooth contact is improperly adjusted, follow the procedure below to adjust the pinion height [dimension (X)].
- If the tooth contact is near the face (face contact), or near the heel (heel contact), thicken pinion height adjusting washers to move drive pinion closer to drive gear.





- If the tooth contact is near the flank (flank contact), or near the toe (toe contact), thin pinion height adjusting washers to move drive pinion farther from drive gear.

BACKLASH
Before inspection and adjustment, drain gear oil.





1. Remove carrier cover. Refer to Disassembly.
2. Fit a dial indicator to the drive gear face to measure the backlash.






Standard
Backlash : Refer to "Backlash". Backlash

- If the backlash is outside of the specified value, change the thickness of side bearing adjusting washer.

When the backlash is large: Decrease side bearing adjusting washer thickness.
When the backlash is small: Increase side bearing adjusting washer thickness.