)
| Disassembly steps |
|||
|---|---|---|---|
| • |
Inspection before disassembly (Refer to .) |
||
| 1. |
Filler plug |
||
| 2. |
Gasket |
||
| 3. |
Drain plug |
||
| 4. |
Packing |
||
| 5. |
Hose<2400> |
||
| 6. |
Vent plug |
||
| 7. |
Bearing cap |
||
| <<A>> |
8. |
Differential case assembly |
|
| <<A>> |
9. |
Differential side bearing spacer |
|
| <<A>> |
10. |
Differential side bearing outer race |
|
| <<B>> |
11. |
Differential side bearing inner race |
|
| <<C>> |
12. |
Drive gear |
|
| <<D>> |
13. |
Lock pin |
|
| 14. |
Pinion shaft |
||
| 15. |
Pinion gear |
||
| 16. |
Pinion washer |
||
| 17. |
Side gear |
||
| 18. |
Side gear spacer |
||
| 19. |
Differential case |
||
| <<E>> |
20. |
Self-locking nut |
|
| 21. |
Washer |
||
| <<F>> |
22. |
Drive pinion assembly |
|
| <<F>> |
23. |
Companion flange |
|
| 24. |
Drive pinion front shim (For adjusting preload of drive pinion) |
||
| 25. |
Drive pinion spacer |
||
| <<G>> |
26. |
Drive pinion rear bearing inner race |
|
| 27. |
Drive pinion rear shim (for adjusting drive pinion height) |
||
| 28. |
Drive pinion |
||
| <<H>> |
29. |
Oil seal |
|
| <<H>> |
30. |
Drive pinion front bearing inner race |
|
| <<H>> |
31. |
Drive pinion front bearing outer race |
|
| <<I>> |
32. |
Drive pinion rear bearing outer race |
|
| 33. |
Oil seal |
||
| 34. |
Differential carrier |
)
- Hold the following special tools in a vise, and install the differential carrier assembly to the special tool.
- Working base (MB990909)
- Working base adapter (MB991116)
)
- With the drive pinion locked in place, use a dial gauge to measure the drive gear backlash in four or more places on the drive gear.
Standard value: 0.11 -
0.16 mm
- If the backlash is not within the standard value, adjust the final drive gear backlash (Refer to
).
- After the adjustment, inspect the final drive gear tooth contact.
)
- Measure the drive gear runout at the shoulder on the reverse side of the drive gear.
Limit: 0.05 mm
- When runout exceeds the limit value, check for foreign material between drive gear rear side and differential case, or for loose drive gear installation bolts.
- When step (2) gives normal results, reposition the drive gear and differential case and remeasure.
- If adjustment is impossible, replace the differential case, or replace the drive gear and pinion as a set.
)
- Insert a wedge between the side gear and the pinion shaft to lock the side gear.
- While locking the side gear with the wedge, measure the differential gear backlash with a dial indicator on the pinion gear.
Use the measurement procedure for the other pinion gear.
Standard value: 0 -
0.076 mm
Limit: 0.2 mm
- If the backlash exceeds the limit value, adjust it by replacing the side gear spacers.
- If adjustment is not possible, replace the side gears and pinion gears as a set.
)
- Apply a thin, uniform coat of machine blue to both surfaces of the drive gear teeth.
CAUTION)
- Insert special tool brass bar (MB990939) between the differential carrier and the differential case, and then rotate the companion flange by hand (once in the normal direction, and then once in the reverse direction) while applying a load to the drive gear so that the revolution torque (approximately 2.5 - 3.0 N·m) is applied to the drive pinion.
- Check the tooth contact condition of the drive gear and drive pinion.
| Standard tooth contact pattern |
Problem |
Solution |
|---|---|---|
| 1. Narrow tooth side 2. Drive-side tooth surface (the side applying power during forward movement) 3. Wide tooth side 4. Coast-side tooth surface (the side applying power during reverse movement) )
|
Tooth contact pattern resulting from excessive pinion height)
The drive pinion is positioned too far from the centre of the drive gear. |
)
Increase the thickness of the drive pinion rear shim, and position the drive pinion closer to the centre of the drive gear. Also, for backlash adjustment, position the drive gear farther from the drive pinion. |
Tooth contact pattern resulting from insufficient pinion height.)
The drive pinion is positioned too close to the centre of the drive gear. |
)
Decrease the thickness of the drive pinion rear shim, and position the drive pinion farther from the centre of the drive gear. Also, for backlash adjustment, position the drive gear closer to the drive pinion. |
NOTE: Check the tooth contact pattern to confirm that the adjustments of the pinion height and backlash have been done properly. Continue to adjust the pinion height and backlash until the tooth contact pattern resembles the standard pattern. If, even after adjustments have been made, the correct tooth contact pattern cannot be obtained, it means that the drive gear and the drive pinion have become worn beyond the allowable limit. Replace the gear set.
)
Use the wooden handle of a hammer to remove the differential case assembly, differential side bearing spacers and differential side bearing outer races.
NOTE: Keep the right and left side bearings and side bearing spacers separate, so that they do not become mixed during reassembly.
)
Use special tool side bearing puller (MB990810) to pull out the side bearing inner races.
NOTE: There are two notches provided (at the differential case side) for the claw part of the special tools;
use special tool at that position.
)
- Make the mating marks to the differential case and the drive gear.
- Loosen the drive gear attaching bolts in a diagonal sequence to remove the drive gear.
)
Drive out the lock pin with a punch.
)
Use special tool end yoke holder (MB990850) to hold the companion flange, and then remove the companion flange self-locking nut.
)
- Use special tool side bearing puller (MB990810) to pull out the companion flange.
)
Use the following special tools to pull out the drive pinion rear bearing inner race.
- Bearing puller (MB990339)
- Pinion bearing remover (MB990374)
)
Use special tool bras bar (MB990939) to remove the oil seal, drive pinion front bearing inner race, and drive pinion front bearing outer race.
)
Use special tool brass bar (MB990939) to remove the drive pinion rear bearing outer race.