Select the adjusting ring using the mandrel A.70184 and tool A.95690 with indicator. Perform 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 housing sockets, using mandrels for this: for the front bearing A.70185, and for the rear bearing - A.70171 (pic. 3-70).
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. 3-71).
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).
Fix fixture A.95690 on the end of mandrel 4 and adjust the indicator, which has divisions 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.
Turning mandrel 4 with indicator to the left and right, set it to a position where the indicator arrow marks the minimum value of a1 (pic. 3-72), and write it down. Repeat this operation on the seating surface of the second bearing and determine the value of a2.
Determine the thickness S of the adjusting ring of the drive gear, which is the algebraic difference between the values a and b:
S = a — b,
where: a - arithmetic mean distance from the end of the mandrel 1 (rice. 3-64) to the differential bearing journals
a = (a1 + a2): 2;
b - deviation of the drive gear from the nominal position, translated in mm. The amount of deviation is marked on the drive gear (pic. 3-73) in hundredths of a millimeter with a plus or minus sign.
When determining the thickness of the adjusting ring, consider the sign of b and its units.
Example. Assume that the value of a, set using the indicator, is 2.91 mm (a is always positive), and on the drive gear after the serial number the deviation is set «-14». To get the value of b in millimeters, you need to multiply the indicated value by 0.01 mm.
b = -14 0.01 = -0.14mm
Determine the thickness of the adjusting ring for the pinion in millimeters.
S \u003d a - b \u003d 2.91 - (-0,14) = 2.91 + 0.14 = 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. 3-74) rear bearing inner race removed from mandrel A.70184. Put on the spacer sleeve.
Warning: When repairing the rear axle gearbox, a new spacer must be installed if the gearbox housing, final drive gears, or pinion 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, locking the flange of the drive gear, tighten it (tightening torque see below).