M226 Without Electronic Locking Differential
ASSEMBLY INSPECTION AND ADJUSTMENT^ Drain the differential gear oil before inspection and adjustment.
^ Remove and install the carrier cover as necessary for inspection and adjustment.
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.
Tool number: ST3127S000 (J-25765-A)
Total preload torque: 2.49 - 4.57 Nm (0.26 - 0.46 kg-m, 22 - 40 in-lb)
NOTE: Total preload torque = Drive pinion bearing preload torque + Side bearing preload torque
^ If the measured value is out of the specification, check and adjust each part. Adjust the drive pinion bearing preload torque first, then adjust the side bearing preload torque.
If the total preload torque is greater than specification
On drive pinion bearings: Replace collapsible spacer.
On side bearings: Loosen side bearing adjuster.
If the total preload torque is less than specification
On drive pinion bearings: Tighten drive pinion lock nut.
On side bearings: Tighten side bearing adjuster.
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 drive gear.
NOTE: Apply red lead to both faces of three to four gears, at four locations evenly spaced on the drive gear.
3. Hold companion flange steady by hand and rotate drive gear in both directions.
4. If outside the standard, adjust drive pinion height adjusting washer and backlash.
Refer to RFD-59, "Drive Pinion Height Adjusting Washer". Drive Pinion Height Adjusting Washer
Refer to RFD-51, "Backlash". Backlash
Backlash
1. Fit a dial indicator to the drive gear face to measure the backlash.
Backlash: 0.08 - 0.13 mm (0.0031 - 0.0051 in)
2. If the backlash is outside of the specification, adjust each side bearing side bearing adjuster.
a. Remove adjuster lock plate.
b. Loosen side bearing cap bolts.
c. Tighten or loosen each side bearing adjuster using Tool.
Tool number: - (C-4164)
If the backlash is greater than specification:
Loosen side bearing adjuster A and tighten side bearing adjuster B by the same amount.
If the backlash is less than specification:
Loosen side bearing adjuster B and tighten side bearing adjuster A by the same amount.
CAUTION: Do not change the side bearing side bearing adjusters by different amounts as it will change the side bearing preload torque.
d. Tighten side bearing cap bolts to the specified torque. Refer to Exploded View RFD-49.
e. Install adjuster lock plate and tighten to the specified torque. Refer to Exploded View RFD-49.
CAUTION: Check tooth contact and total preload torque after adjusting side bearing adjuster.
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.
Runout limit
Companion flange face: 0.10 mm (0.0039 in)
Companion flange inner side: 0.13 mm (0.0051 in)
2. If the runout is outside the runout limit, follow the procedure below to adjust.
a. Rotate the companion flange on the drive pinion by 90°, 180° and 270° while checking for the position where the runout is minimum.
b. 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.
c. If the runout is still outside of the runout limit after repair of the assembly of drive pinion and drive pinion bearing or drive pinion bearing, replace the companion flange.