Carrier Bearing Preload Adjustment
Carrier Bearing Preload AdjustmentSpecial Tools Required
- Attachment, 78 x 80 mm 07NAD-PX40100
- Preload inspection tool 07XAJ-S0KAJ00
- Driver 07749-0010000
If any of the items listed below were replaced, the carrier bearing preload must be adjusted.
- Transmission housing
- Clutch housing
- Differential carrier
- Spacer
- Carrier bearing and outer race
1. Remove the oil seals from the transmission housing and clutch housing.
2. If you replaced the carrier bearing on the transmission housing side of the carrier, remove and discard the bearing outer race, Heat up the transmission housing to about 212°F (100°C) with a heat gun (A), then remove the bearing outer race (B), spacer (C), and 81 mm thrust shim (D). Do not heat the housing in excess of 212°F (100°C).
3. If you replaced the carrier bearing on the clutch housing side of the carrier, remove and discard the bearing outer race, heat up the clutch housing to about 212°F (100°C) with a heat gun (A), then remove the bearing outer race (B) and spacer (C). Do not heat the housing in excess of 212°F (100°C)
4. Install the 81 mm thrust shim (A), spacer (B), and bearing outer race (C) in the transmission housing by using the special tools. (Use a new bearing outer race if you replaced the bearing.) There should be no space between the bearing outer race, spacer, and housing.
5. If you removed the bearing outer race from the clutch housing, use the special tools to install a new bearing outer race (A) and spacer (B). There should be no space between the bearing outer race, spacer, and housing.
6. With the mainshaft and countershaft removed, install the differential assembly, and bolt the transmission and clutch housing together, and tighten the bolts to 44 Nm (4.5 kgf-m) 33 ft. lbs.).
NOTE: It is not necessary to use sealing agent between the housings for this adjustment.
7. Rotate the differential assembly in both directions to seat the tapered roller bearings.
8. At normal room temperature, measure the starting torque of the differential assembly by rotating it in both directions with the special tool and a torque wrench (A).
9. If the carrier bearing preload is not within the standard, select a 81 mm thrust shim that will provide the correct preload:
- Compare the bearing preload you got on the first try with the specified preload of 3.43 - 4.51 Nm (35 - 46 kgf-cm, 30-40 inch lbs.).
- If the preload you measure was less than specified, subtract it from the specified preload.
- If the preload you measure was more than specified, subtract the specified preload from the preload you measure.
For example, with a 2.50 mm (0.098 inch) thrust shim:
NOTE: Each shim size up or down from standard makes about 0.3 - 0.4 Nm (3 - 4 kgf-cm, 2.6 - 3.5 inch lbs.) difference in preload.
In example (1), your preload was 1.96 Nm (20 kgf-cm, 17 inch lbs.) less than standard, so you need a thrust shim five sizes thicker than standard (try the 2.65 mm (0.104 inch) 81 mm thrust shim, and recheck).
In example (1), your preload was 0.78 Nm (8 kgf-cm, 7 inch lbs.) more than standard, so you need a thrust shim two sizes thinner (try the 2.44 mm (0.096 inch) 81 mm thrust shim, and recheck).
10. Once the carrier bearing preload is correct, disassemble the transmission housing, and install new oil seals in the differential.
11. Reassemble the transmission.
12. Reinstall the transmission.