Assembling Unit
- Apply gear oil to differential side bearing, place differential side bearing outer races on their respective bearings, and install differential case assembly in differential carrier.
- Measure distance "a" and "b".
- Select shim(s) for right and left sides and install them between differential carrier and differential bearing outer races.NOTE: Two 2.0 mm (0.079 in.) shims for the left side and two 3.0 mm (0.118 in.) shims for the right side are installed as standard. Therefore, choose shims which are close to the ones mentioned above. For example, if "a"-"b" is 10.05 mm (0.396 in.), combination pattern is as follows.PATTERN CHART
Pattern Right side Left side 1 1.75 mm (0.069 in.), 2.25 mm (0.089 in.) 3.00 mm (0.118 in.), 3.05 mm (0.120 in.) 2 1.85 mm (0.073 in.), 2.15 mm (0.085 in.) 3.00 mm (0.118 in.), 3.05 mm (0.120 in.) 3 1.95 mm (0.077 in.), 2.05 mm (0.081 in.) 3.00 mm (0.118 in.), 3.05 mm (0.120 in.) 4 2.00 mm (0.079 in.), 2.00 mm (0.079 in.) 3.00 mm (0.118 in.), 3.05 mm (0.120 in.) 5 2.00 mm (0.079 in.), 2.05 mm (0.081 in.) 2.75 mm (0.108 in.), 3.25 mm (0.128 in.) 6 2.00 mm (0.079 in.), 2.05 mm (0.081 in.) 2.85 mm (0.112 in.), 3.15 mm (0.124 in.) 7 2.00 mm (0.079 in.), 2.05 mm (0.081 in.) 2.95 mm (0.116 in.), 3.05 mm (0.120 in.) 8 2.00 mm (0.079 in.), 2.05 mm (0.081 in.) 3.00 mm (0.118 in.), 3.00 mm (0.118 in.) Available shim(s)
Right side
1.75, 1.85, 1.95, 2.00, 2.05, 2.15 and 2.25 mm (0.069, 0.073, 0.077, 0.079, 0.081, 0.085 and 0.089 in.)
Left side
2.75, 2.85, 2.95, 3.00, 3.05, 3.15 and 3.25 mm (0.108, 0.112, 0.116, 0.118, 0.120, 0.124 and 0.128 in.)
- Measure bevel gear backlash by using dial gauge. If backlash is out of range, repeat from step 3.
Drive bevel gear backlash
0.10 - 0.20 mm (0.004 - 0.008 in.)
NOTE:- Before measurement, hit shims lightly for several times by plastic hammer to position shims in correct position.
- Be sure to apply measuring tip of dial gauge at right angles to convex side (drive side) of tooth.
- Measure at least 4 points on drive bevel gear periphery.
- If backlash is out of specification, change shim(s) so that backlash is within specification.
- Install axle lock actuator mounting bolts.
- Assemble differential carrier cover and differential carrier temporarily.NOTE: Tighten 12 mm thread diameter bolts (1) first, then loosen 8 mm thread diameter bolts (2).
Tightening torque
Front differential cover bolt (12 mm) a: 85 N.m (8.5 kg-m, 61.5 lb-ft)
Front differential cover bolt (8 mm) b: 23 N.m (2.3 kg-m, 17.0 lb-ft)
- Measure preload of pinion with spring balance (1) or torque wrench (2), and then check composite preload of pinion bearing and side bearing.NOTE:
- Standard preload is shown in graph, which should be read as follows.
Example:
When preload of pinion is 2.6 kg / 5.73 lb, acceptable composite preload of both pinion bearings and differential side bearings should be between 2.8 and 3.2 kg / 6.17 and 7.05 lb.
Special Tool
(D): 09922-75222
- Bearing preload can be checked roughly by using flange holder as shown in the figure. In this measurement, holder arm itself will work as balance weight and torque will be replaced with angle. However, flange should be rotated very slowly with hand support so as not to allow over revolution due to inertia.
Special Tool
(E): 09922-66021
- Repeat differential side bearing adjustment until gear backlash and composite bearing preload are compatible within specification.
- Standard preload is shown in graph, which should be read as follows.
- As final step, check gear tooth contact as follows.
- After cleaning tooth surface of 10 bevel gears, paint them with gear marking compound evenly by using brush (1) or sponge etc.
- Assemble differential carrier cover and differential carrier temporarily.NOTE: Tighten 12 mm thread diameter bolts (1) first, and then loosen 8 mm thread diameter bolts (2).
Tightening torque
Front differential cover bolt (12 mm) a: 85 N.m (8.5 kg-m, 61.5 lb-ft)
Front differential cover bolt (8 mm) b: 23 N.m (2.3 kg-m, 17.0 lb-ft)
- Turn gear to bring its painted part in mesh with pinion and turn it back and forth by hand to repeat their contact.
- Remove cover bolts (1, 2) and differential carrier cover.NOTE: Loosen 8 mm thread diameter bolts (2) first, and then loosen 12 mm thread diameter bolts (1)
- Bring painted part up and check contact pattern, referring to the following chart. If contact pattern is not normal, readjust or replace as necessary according to instruction in chart.
NOTE: Be careful not to turn bevel gear more than one full revolution, for it will hinder accurate check.TOOTH CONTACT PATTERN REFERENCE CHARTTooth Contact Pattern Diagnosis and Remedy Normal High Contact
Pinion is positioned too far from the center of driver bevel gear.- Increase thickness of pinion height adjusting shim and position pinion closer to gear center.
- Adjust bevel gear backlash to specification.
Low Contact
Pinion is positioned too close to the center of bevel gear.- Decrease thickness of pinion height adjusting shim and position pinion farther from gear center.
- Adjust bevel gear backlash to specification.
If adjustment is impossible, replace differential carrier. - Check seating of bevel gear or differential case, (Check bevel gear for runout.
- If adjustment is impossible, replace bevel gear and pinion set or differential carrier.
Replace bevel gear and pinion set or differential case. - Upon completion of gear tooth contact check in Step 8, clean mating surfaces of both cover and carrier and apply sealant "A" to cover side evenly.
"A": Sealant 99000-31110
- Install differential carrier cover to differential carrier.NOTE: Tighten 12 mm thread diameter bolts (1) first, and then loosen 8 mm thread diameter bolts (2).
Tightening torque
Front differential cover bolt (12 mm) a: 85 N.m (8.5 kg-m, 61.5 lb-ft)
Front differential cover bolt (8 mm) b: 23 N.m (2.3 kg-m, 17.0 lb-ft)
- Install axle lock actuator motor onto differential carrier cover.
"A": Grease 99000-25010
- Install front drive shaft case (1) to differential housing (2).
"A": Sealant 99000-31110
Tightening torque
Front drive shaft case bolt a: 50 N.m (5.0 kg-m, 36.5 lb-ft)
- Install front mounting bracket R (1) onto differential housing (2).
"A": Sealant 99000-31110
Tightening torque
Front mounting bracket bolt a: 50 N.m (5.0 kg-m, 36.5 lb-ft)