Removal And Installation

FRONT OIL SEAL

Removal and Installation


REMOVAL


CAUTION:
Verify identification stamp of replacement frequency put in the lower part of gear carrier to determine replacement for collapsible spacer when replacing front oil seal. Refer to "Identification stamp of replacement frequency of front oil seal". If collapsible spacer replacement is necessary, remove final drive assembly and disassemble it to replace front oil seal and collapsible spacer. Removal And Installation and Disassembly.

NOTE:
The reuse of collapsible spacer is prohibited in principle. However, it is reusable on a one-time basis only in cases when replacing front oil seal.





- The diagonally shaded area in the figure shows stamping point for replacement frequency of front oil seal.
- The following table shows if collapsible spacer replacement is needed before replacing front oil seal.
When collapsible spacer replacement is required, disassemble final drive assembly to replace collapsible spacer and front oil seal. Disassembly.





CAUTION:
Make a stamping after replacing front oil seal.
- After replacing front oil seal, make a stamping on the stamping point in accordance with the table below in order to identify replacement frequency.

CAUTION:
Make a stamping from left to right.






1.Drain gear oil. Draining.
2.Make a judgment if a collapsible spacer replacement is required.
3.Remove propeller shaft. Removal And Installation.
4.Remove rear drive shaft. Removal And Installation.
5.Remove electric controlled couplings. Removal And Installation.






6.Measure the total preload with the preload gauge (A) [SST: ST-3127S000 (J-25765-A)].

NOTE:
Record the preload measurement.





7.Put matching mark (A) on the end of the drive pinion. The matching mark should be in line with the matching mark (B) on companion flange (1).

CAUTION:
For matching mark, use paint. Never damage companion flange and drive pinion.





8.Remove companion flange lock nut using the flange wrench (A)
(Commercial service tool).





9.Remove companion flange using the puller (A) (Commercial service tool).





10.Remove front oil seal using the suitable oil seal remover.

CAUTION:
Never damage gear carrier and drive pinion.

INSTALLATION

1.Apply multi-purpose grease to front oil seal lips.





2.Using the drift (A) (Commercial service tool), drive front oil seal until it becomes flush with the gear carrier end.

CAUTION:
- Never reuse oil seal.
- Never incline oil seal when installing.





3.Align the matching mark (A) of drive pinion with the matching mark (B) of companion flange (1), and then install the companion flange.





4.Temporarily tighten drive pinion lock nut to drive pinion, using the flange wrench (Commercial service tool).

CAUTION:
- Never reuse drive pinion lock nut.
- Apply anti-corrosion oil to the thread and seat of new drive pinion lock nut.
5.Tighten drive pinion lock nut within the limits of specified torque so as to keep the pinion bearing preload within a standard values, using the preload gauge (A) [SST: ST-3127S000 (J-25765A)].

Total preload torque: A value that add 0.1 - 0.4 Nm (0.01 - 0.04 kg-m, 1.0 - 3.0 in-lb) to the measured

value before removing.

CAUTION:
- Adjust to the lower limit of the drive pinion lock nut tightening torque first.
- If the preload torque exceeds the specified value, replace collapsible spacer and tighten it again to adjust. Never loosen drive pinion lock nut to adjust the preload torque.





6.Check for companion flange runout as follows:
- For companion flange face, fit a dial indicator (1) onto the companion flange face (inner side of the propeller shaft mounting bolt holes). For inner side of the companion flange, fit a test indicator (2) to the inner side of companion flange (socket diameter).
- Rotate companion flange to check for runout.

Companion flange runout: Companion Flange Runout.

- If the runout value is outside the runout limit, follow the procedure below to adjust.
- Check for runout while changing the phase between companion flange and drive pinion by 90� step, and search for the position where the runout is the minimum.
- If the runout value is still outside of the limit after the phase has been changed, replace companion flange.
- If the runout value is still outside of the limit after companion flange has been replaced, possible cause will be an assembly malfunction of drive pinion.
7.Make a stamping for identification of front oil seal replacement frequency. Refer to "Identification stamp of replacement frequency of front oil seal".

CAUTION:
Make a stamping after replacing front oil seal.
8.Install electric controlled couplings. Removal And Installation.
9.Install rear drive shaft. Removal And Installation.
10.Install propeller shaft. Removal And Installation.
11.Refill gear oil to the final drive and check level. Refilling.
12.Check the final drive for oil leakage. Inspection.