Maintenance of the rear axle consists of:
- - periodically checking the oil level in the crankcase, topping it up and changing it according to the lubrication chart;
- - cleaning the breather from dirt;
- - tightening the drive gear flange nut, axle nuts, checking and restoring the adjustments of the wheel hub bearings, drive gear and differential
It is prohibited to change oil filled at OJSC GAZ until the mileage is 60,000 km.
The clearances in the final drive must be measured on the vehicle after disconnecting the driveshaft.
Before checking the gaps, it is necessary to check the tightness of the nut 1 of the drive gear flange, for which it is necessary to unscrew the nut and tighten it with a torque of 160-200 Nm (16-20 kgcm).
By moving the drive gear flange in the axial and angular directions, check the clearances.
The axial clearance in the drive gear bearings is checked as indicated in the article - "Adjusting the axle gearbox GAZ-2705"
To measure the total angular play of the drive gear flange, you need to make a mark on the edge of the flange dirt deflector, turn the flange all the way to the left and make a mark on the crankcase that coincides with the mark on the reflector.
Turn the flange all the way to the right and make a second mark on the crankcase.
Measure the distance between the marks on the crankcase.
If it exceeds 12 mm, this indicates excessive wear on the teeth of the drive and driven gears of the final drive, differential gears, or the splines of the side gears and axle shafts.
Drain the oil from the rear axle housing after it has been preheated.
The oil level is checked and topped up through the crankcase filler hole with the car standing on a horizontal platform.
The check should be carried out some time after the trip to allow the oil to cool and drain from the crankcase walls.
Lack of oil or excess are equally harmful.
If the noise of the bridge is increased to such an extent that it is considered unacceptable from a comfort point of view or causes a risk of failure, it is considered a malfunction.
Axle whine (high-pitched noise) affects comfort and can be avoided by avoiding long periods of driving in the narrow speed ranges at which it is heard.
Before disassembling the bridge, you should make sure that the noise is coming from the bridge.
Sources of noise can be a faulty clutch disc, tires (noise varies with different road surfaces and increases with speed), engine.