Inspection And Adjustment

• Drain the differential gear oil before inspection and adjustment. Refer to Draining .
• Remove the axle shaft assemblies (RH/LH) before inspection and adjustment.
• Disconnect the propeller shaft from the rear final drive assembly and support the propeller shaft. Refer to Removal and Installation .
• Remove and install the carrier cover as necessary for inspection and adjustment. Refer to Removal and Installation .

Total Preload Torque 

1. Rotate the drive pinion back and forth 2 to 3 times to check for unusual noise and rotation malfunction.
2. Rotate the drive pinion at least 20 times to check for smooth operation of the bearings.
3. Measure total preload torque using Tool (A).

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   Total preload torque

   : Refer to Preload Torque .

   Tool	: ST3127S000 (J-25765-A)

   NOTE: Total preload torque = Drive pinion bearing preload torque + Side bearing preload torque
   • If the measured value is greater than specification, adjust as necessary.
   • Adjust the drive pinion bearing preload torque first, then adjust the total preload torque by selecting side bearing adjusting shims.
   • The differential gear case assembly must be removed to adjust the drive pinion bearing preload.

   If the total preload torque is greater than specification
   On drive pinion bearings	: Replace collapsible spacer.
   On side bearings	: Use thinner side bearing adjusting washers by the same amount on each side. Refer to Preload Torque .

   If the total preload torque is less than specification
   On drive pinion bearings	: Tighten drive pinion lock nut.
   On side bearings	: Use thicker side bearing adjusting washers by the same amount on each side. Refer to Preload Torque .

Tooth Contact 

Checking gear tooth contact pattern is necessary to verify correct relationship between drive gear and drive pinion. Gears which are not positioned in proper arrangement may be noisy and/or have a short life. Check gear tooth contact pattern to obtain the best contact for low noise and long life.

1. Thoroughly clean drive gear and drive pinion teeth.
2. Apply red lead to the drive gear.

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   • Apply red lead to both faces all gears then check all gears.
3. Rotate the drive gear back and forth several times. Then check for correct drive pinion to drive gear tooth contact as shown, below.

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   CAUTION: Check tooth contact on drive side and reverse side.
4. If the tooth contact is improperly adjusted, follow the procedure below to adjust the pinion height (dimension X).

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   • If the tooth contact is near the face (face contact), or near the heel (heel contact), use a thicker drive pinion height adjusting washers to move the drive pinion closer to the drive gear.

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     Refer to Exploded View .

   • If the tooth contact is near the flank (flank contact), or near the toe (toe contact), use a thinner drive pinion height adjusting washers to move the drive pinion farther from the drive gear.

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     Refer to Exploded View .

Backlash 

1. Fit a dial indicator to the drive gear face to measure the backlash.

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   Backlash

   : Refer to Backlash .

   • If the backlash is outside of the specification, change the thickness of each side bearing adjusting shim.

   If the total preload torque is greater than specification
   On drive pinion bearings	: Replace collapsible spacer.
   On side bearings	: Use thinner side bearing adjusting washers by the same amount on each side. Refer to Preload Torque .

   If the total preload torque is less than specification
   On drive pinion bearings	: Tighten drive pinion lock nut.
   On side bearings	: Use thicker side bearing adjusting washers by the same amount on each side. Refer to Preload Torque .

   CAUTION: Do not change the total thickness of side bearing adjusting shims as it will change the total preload torque.

Companion Flange Runout 

1. Rotate companion flange and check for runout on the companion flange face (inner side of the bolt holes) and companion flange inner side (socket diameter) using suitable tool. Refer to Companion Flange Runout .

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2. If the runout is outside the runout limit, follow the procedure below to adjust.
   1. Rotate the companion flange on the drive pinion by 90°, 180° and 270° while checking for the position where the runout is minimum.
   2. If the runout is still outside of the runout limit after the companion flange has been rotated on the drive pinion, possible cause could be an assembly malfunction of drive pinion and drive pinion bearing or a malfunctioning drive pinion bearing.
   3. If the runout is still outside of the runout limit after replacing the companion flange. Replace the rear final drive assembly. Refer to Removal and Installation .