Pic. 3-72. Rear axle gear details: 1 - drive gear flange; 2 - stuffing box; 3 - oil deflector; 4 - front bearing; 5 - rear bearing; 6 - adjusting ring of the drive gear; 7 - support washer of the axle gear; 8 - gear, axle shafts; 9 - satellite; 10 - axis of the satellites; 11 - driven gear; 12 - differential box; 13 - differential box bearing; 14 - adjusting nut; 15 - a bolt of fastening of a locking plate; 16- locking plate; 17 - locking plate; 18 - a bolt of fastening of a driven gear; 19 - drive gear; 20 - cover fastening bolt; 21 - spring washer; 22 - gasket; 23 - gearbox mounting bolt; 24 - gearbox housing; 25 - spacer sleeve; 26 - flat washer; 27 - a nut of fastening of a flange of a leading gear wheel
Differential Assembly
Lubricate with gear oil and install through the windows in the differential box the gears of the axle shafts with support washers and satellites. Turn the satellites and gears of the axle shafts so as to align the axis of rotation of the satellites with the axis of the hole in the box, then insert the axis of the satellites.
Check the axial clearance of each axle gear, it should be 0-0.10 mm, and the moment of resistance to rotation of the differential gears should not exceed 14.7 Nm (1.5 kgf·m).
If the clearance is increased, which is a sign of wear of the differential parts, replace the bearing washers of the gears of the axle shafts with others of greater thickness. If the specified clearance cannot be obtained even with the thickest washers installed, replace the gears with new ones due to excessive wear.
Attach the driven gear to the differential box. Using mandrel A.70152, press the inner races of roller bearings onto the differential box.
Installing and adjusting the drive gear
The correct position of the drive gear relative to the driven gear is ensured by selecting the thickness of the adjusting ring installed between the thrust end of the drive gear and the inner ring of the rear bearing.
Select the adjusting ring using mandrel A.70184 and tool A.95690 with indicator Perform the operations in the following order.
Having fixed the gearbox housing on the stand, press the outer rings of the front and rear bearings of the drive gear into the crankcase sockets, using mandrels for this: for the front bearing - A.70185, and for the rear - A.70171 (pic. 3-73).
Pic. 3-73. Installation of the outer ring of the rear bearing of the drive gear with a mandrel: 1 - mandrel А.70171
On mandrel A.70184, simulating the drive gear, use mandrel A.70152 to install the inner ring of the rear bearing and insert the mandrel into the neck of the gearbox housing (pic. 3-74)
Pic. 3-74. Determining the thickness of the drive gear adjusting ring: 1 - indicator; 2 - fixture A.95690; 3 - rear bearing of the drive gear; 4 - mandrel А.70184
Install the front bearing inner ring, drive gear flange and, turning the mandrel to properly install the bearing rollers, tighten the nut to a torque of 7.85-9.8 N·m (0.8-1 kgf·m).
Fasten fixture A.95690 on the end of mandrel 4 and adjust the indicator, which has a division of 0.01 mm, to the zero position by placing its leg on the same end of mandrel A.70184. Then move indicator 1 so that its leg rests on the seating surface of the differential box bearing.
By turning mandrel 3 with indicator to the left and right, set it to a position where the indicator arrow marks the minimum value «A1» (fig 3-75), and write it down Repeat this operation on the seat of the second bearing and determine the value «A2».
Pic. 3-75. Scheme for taking measurements to determine the thickness of the adjusting ring of the drive gear: 1 - mandrel A.0184; 2 - fixture A.95690 with an indicator, and1 and a2 - distance from the end face of the mandrel to the necks of the differential bearings
Determine thickness «S» adjusting ring of the drive gear, which is the algebraic difference between the values «A» and «b»:
S = a - b, where:
a is the arithmetic mean distance from the ends of the mandrel 1 (rice. 3-67) to the differential bearing journals
a = a1+a2/2
b - deviation of the drive gear from the normal position translated in mm. The amount of deviation is marked on the drive gear (pic. 3-76) in hundredths of a millimeter with a plus or minus sign.
When determining the thickness of the adjusting ring, consider the sign of the value «b» and its unit of measurement.
Pic. 3-76. Main gears: 1 - driven gear; 2 - serial number; 3 - correction in hundredths of a millimeter to the nominal position; 4 - drive gear
Example. Let's assume that the value «A» set with an indicator is 2.91 mm (magnitude «A» positive), and on the drive gear after the serial number the deviation is set «—14». To get the value «b» in millimeters, you need to multiply the indicated value by 0.01 mm.
b = -14 x 0.01 = -0.14 mm
Determine the thickness of the adjusting ring for the pinion in millimeters.
S = a-b = 2.91mm - (-0.14 mm) = 2.91 mm + 0.14 mm = 3.05 mm
In this case, install a 3.05 mm thick adjusting ring.
Put an adjusting ring of the required thickness on the drive gear and press on with mandrel A.70152 (pic. 3-77) rear bearing inner race, removed with mandrel A.70184. Put on the spacer sleeve.
Pic. 3-77. Installing the rear bearing inner race on the drive gear: 1 - roller bearing ring; 2 - mandrel A.70152; 3 - adjusting ring; 4 - drive gear
Warning. When repairing the rear axle gearbox, a new spacer must be installed if the gearbox housing, final drive gears or drive gear bearings have been replaced. If the specified parts remain the same, the spacer sleeve can still be used.
Insert the drive gear into the gear housing and install the front bearing inner race, oil slinger, oil seal, drive gear flange and washer onto it.
Screw a nut onto the end of the gear and lock the flange of the drive gear, tighten it (tightening torque see below).