Select the adjusting ring using the mandrel A.70184 and tool A.95690 with indicator. Perform operations in the following order.
Having fixed the crankcase on the stand, press the outer rings of the front and rear bearings of the drive gear into the housings of the crankcase, using mandrels for this: for the front bearing A.70185, and for the rear bearing - 67.7853.9575 (pic. 3-64).
Pic. 3-64. Installation of the outer ring of the rear bearing of the drive gear with a mandrel:
1 - mandrel 67.7853.9575.
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. 3-65).
Pic. 3-65. Determining the thickness of the drive gear adjusting ring:
1 - indicator;
2 - fixture A.95690;
3 - rear bearing of the drive gear;
4 - mandrel A.70184.
Install the front bearing inner ring, the drive gear flange and, turning the mandrel to properly install the bearing rollers, tighten the nut to a torque of 7.85-9.8 Nm (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 «and1» (pic. 3-66) and write it down. Repeat this operation on the seat of the second bearing and determine the value «and2».
Pic. 3-66. Scheme for taking measurements to determine the thickness of the adjusting ring of the drive gear:
1 - mandrel A.70184;
2 - fixture A.95690 with indicator;
a1 and a2 are the distance from the end of the mandrel to the journals 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 - arithmetic mean distance from the end of the mandrel 1 (pic. 3-66) 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. 3-67) in hundredths of a millimeter with a plus or minus sign.
Pic. 3-67. Main gears:
1 - driven gear;
2 - serial number;
3 - correction in hundredths of a millimeter to the nominal position;
4 - drive gear.
When determining the thickness of the adjusting ring, consider the sign of the value «b» and its units of measurement.
Example. Let's assume that the value «A», set using the indicator, is equal to 2.91 mm (magnitude «A» always 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 \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.
Install an adjusting ring of the required thickness on the drive gear and press on with mandrel A.70152 (pic. 3-68) rear bearing inner race removed from mandrel A.70184. Install spacer sleeve.
Pic. 3-68. 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 pinion bearings have been replaced. If the specified parts remain the same, the spacer sleeve can still be used.
Install the drive gear into the gear housing and install the front bearing inner race, oil slinger, oil seal, drive gear flange and washer on it. Screw a nut onto the end of the gear and, locking the flange of the drive gear, tighten it (tightening torque see below).