The car has a rigid rear axle in the form of a beam, consisting of the final drive housing and semi-axle covers pressed into it
The main gear with the differential form a gearbox that is installed in the crankcase hole and secured with bolts.
1 - brake drum; 2 - hub; 3 - cuff hub; 4 - thrust washer; 5 - axle housing; 6 - hub bearings; 7 - bearing nut; 8 - locknut; 9 - axle shaft flange; 10 - hairpin; 11 - gasket; 12 - box of differential satellites, right; 13 - rear axle housing; 14 - washer support gear; 15,19 - side gears; 16 - satellite support washer; 17 - satellites; 18 - axis of the satellites; 20 - left differential satellite box; 21 - beam; 22 - axle shaft; 23 - differential bearing nut; 24 - differential bearing; 25 - driven gear of the main gear; 26 - breather; 27 - nut; 28 - washer; 29 - drive gear flange; 30 - cuff; 31 - mud deflector; 32.34 - drive gear bearings; 33 - spacer ring; 35 - adjusting ring; 36 - drive gear; 37 - gearbox housing; 38 - bolt; 39 - locking plate
Gear type differential. The differential box consists of two parts, which are bolted together.
A driven gear is bolted to it. The differential box contains two semi-axial gears and four satellites that are in constant engagement.
Thrust washers are installed between the differential box and the ends of the side gears and satellites.
The satellites rotate around the axles, which fix each other in the differential box with the help of recesses in the central part.
Conical roller bearings are pressed onto the trunnions of the differential box.
In the crankcase of the beam there are seats for differential bearings and adjusting nuts for differential bearings.
The differential assembly with the driven gear and bearings is attached to the gearbox housing with two bolted covers.
The crankcase housings and bearing caps are machined as an assembly at the factory, so the caps are not interchangeable.
Adjusting nuts provide the necessary side clearance between the final drive gears and the preload of the differential box bearings.
The adjusting nuts are secured against movement by locking plates that are bolted to the bearing caps.
The main gear is hypoid, the axis of the drive gear is shifted down relative to the axis of the driven gear by 42 mm.
The final drive ratio is 5.125
The outer part of the axle shaft, made in the form of a flange, is attached to the rear wheel hub with nuts or bolts
Studs for fastening wheels and brake drums are pressed into the hub.
The bearings are also adjusted and fixed in the axial direction with an adjusting nut with a locknut.
An oil seal is pressed into the hub behind the inner bearing.
The axle shaft is splined into the side gear.
Possible malfunctions of the rear axle
- Cause of malfunction
Remedy
The noise (hum) of the high-volume bridge:
- Loosening the pinion flange nut
Tighten the nut
- Wear or play of the working surfaces of the bearings of the drive gear or differential
Check the running surfaces of the bearings and, if necessary, replace them. Adjust bearing preload
Pulsating bridge noise (binding)
- Loosening of the fastening bolts of the driven gear or it is installed skewed
Tighten the bolts of the driven gear and check the runout of its "nape"
High tone bridge "howl" noise:
- Insufficient or excessive oil level
Restore oil level to normal
- Non-recommended oil used
Change the oil
- Incorrectly adjusted contact between the teeth of the new final drive gears
Check the contact patch and adjust it
- Seizures on the working surface main gear kill
Replace gears
Strong knocking in the axle when the accelerator pedal is pressed hard after coasting or cornering:
- Excessive wear of differential parts
Check total play in final drive and differential
Replace worn parts
Continuous thumping and crunching in the bridge:
- Wear of teeth or bearings
Replace worn parts
Oil leak through the cuffs of the drive gear, the hub, as well as along the plane of the crankcase connector and the cover:
- Wear of the cuffs of the drive gear and the hubs of the rear wheels, the flange of the drive gear, the crankcase pin
Replace worn parts
- Clogged breather
Clean breather
- Loosening the crankcase cover bolts
Tighten the bolts
- - Crankcase cover deformation
- - Cover gasket damage
Replace cover
Replace gasket