Special devices for adjustment
a) Place the rear bearing on the special tool and install the tool together with the rear bearing into the gearbox housing.
b) Install the front bearing and washer onto the special tool. Tighten the special tool nut so that it can be rotated by hand.
Caution: Do not install adjusting shims.
c) Place the special device with the pointer indicator on a flat surface and set the indicator arrow to zero.
d) Install the device with the indicator as shown in the figure.
d) Place the indicator measuring tip on the place of the gearbox housing where the side bearing beds are located. Measure the positions of the lowest points of the right and left bearing beds.
(Data provided by the website: www.MAZbook.ru)
e) Add the two quantities (right and left), defined in point "d", and divide the resulting amount by 2.
From the result, subtract the number printed on the end of the drive gear and divide by 100 (the absence of a number corresponds to the value zero).
Meaning of marks on the drive gear:
- "2" — +0.03 mm
- "-1" — -0.03 mm
Example.
The value of the two measured quantities is 0.14 and 0.26 mm and the number on the drive gear is 2.
(0,18 + 0,26)/2 - 2/100 = 0,20
The adjustment index value for this pinion and gearbox housing assembly is 0.20mm.
Select adjusting shims of this thickness and install them between the bearing housing and the gearbox housing.
Note:
- select the thickness of the set of adjusting shims with an accuracy of 0±0.03 mm;
- no more than five pads can be used.
2. Adjusting the preload of the drive gear bearings.
Caution: Do not install the oil seal.
a) Install the pinion gear, new spacer sleeve, coupling flange, washer, spacer, front bearing and new adjusting nut into the bearing housing. Temporarily tighten the adjusting nut.
b) To install the bearings, turn the connecting flange by hand.
c) To achieve the set bearing preload, hold the connecting flange with a special device and tighten the adjusting nut to the lower tightening torque value.
- Tightening torque - 294 - 500 Nm
- Preload of pinion bearings 2.55 - 4.00 Nm
Note: If the specified preload cannot be achieved, disassemble the assembly, re-adjust the pinion height, and adjust the preload using a new spacer sleeve.
d) Remove the adjusting nut, washer and connecting flange.
3. Assembling the differential.
Note: Always replace friction discs as a set, even if only one disc needs to be replaced.
a) Install the friction discs and the retaining ring onto the axle gear. Make sure the retaining ring is installed securely.
b) Place the differential housing on the workbench, then install the axle gears with friction discs into the differential housing.
c) Install the locking devices into the differential housing.
d) Install the differential together with the accessories on the axle shaft, aligning the splines.
d) Install the satellites into the differential housing. Hold the satellites with your hand.
e) Tighten the fixture.
g) Using the device, rotate the differential housing and install the satellites.
h) Tighten or loosen the device until there is a slight resistance to rotation of the satellites and axle gears.
i) Rotate the differential housing to align the holes of both satellites with the holes in the differential housing.
k) Tighten the fixture and install the thrust washer.
l) Install the thrust washer by pushing it in with a small flat-head screwdriver. Align the holes in the washer and the differential housing.
