Main main gear malfunctions:
- The bearings of the rear axle gearbox are worn out, their preload is broken, the landing is weakened (uniform noise from the rear axle)
- The teeth of the gears of the main gear are worn out, the lateral clearance in the engagement is broken, the scuffs on the teeth are a howl from the side of the rear axle, which decreases or disappears when the load is reduced (the gas pedal is released)
Rear axle dismantling
It is more convenient to work on the inspection ditch together.
Drain the oil (see How to change the oil in the gazelle rear axle gearbox)
Disconnect the driveline from the rear axle (see How to remove the Gazelle driveshaft).
We clean the main gear housing from dirt.
We take out the axle shafts on both sides of the car (see How to remove the rear wheels and axle shafts of the Gazelle car ).
With a key or a “14” head, we unscrew ten bolts securing the gearbox to the rear axle beam.
We remove the gearbox from the beam, while trying not to damage the gasket.
For the convenience of work, we install the gearbox on the stand.
Remove the drive gear flange with the cuff.
With a punch, we mark the relative position of the differential bearing caps and their nuts, as well as the caps themselves relative to the crankcase.
Remove the drive gear flange with the cuff. Using the “12” key, we unscrew the bolts of the locking plates
Remove the locking plates
Using a key or a “17” head, unscrew the bearing cap bolts
Remove the cover. Remove the second cover in the same way.
Using a special wrench or a large screwdriver, unscrew the adjusting nuts of the bearings
Remove the adjusting nuts
Remove the box of satellites with the driven gear.
If the bearings are not replaced, we mark their outer rings in order to install them in their original places during assembly.
The driven gear is mounted on the pinion box in only one position, therefore, to simplify assembly, we mark the relative position of the gear and the housing.
With a key or a “17” head, we unscrew 10 gear mounting bolts.
With light hammer blows through a soft metal drift, knock the gear off the satellite box and remove it.
Special recesses are provided for the puller legs on the satellite box.
Installing a special puller
Remove the inner bearing rings with a puller.
Similarly, remove the second bearing.
In the absence of a puller, insert a chisel between the end of the inner ring of the bearing and the differential box.
By striking the chisel, we move the inner ring of the bearing.
Insert two powerful screwdrivers (or mounting blades) into the resulting gap
We press the inner ring of the bearing with the cage and rollers.
With a center punch we mark the relative position of the parts of the differential box and the axes of the satellites.
Using the “13” key, we unscrew the eight bolts connecting the parts of the differential box
Carefully tapping the soft drift with a hammer
disconnect the box.
We take out the side gear from the removed half of the box
Remove the support washer.
We take out the axles together with the satellites and their washers
Remove satellites and washers from axles
Remove the second side gear
Remove the support washer.
We take out the drive gear from the gearbox housing (it can be knocked out with hammer blows through a soft metal spacer on the end of the shaft) and the inner ring of the front bearing.
Remove the spacer ring.
Compress the inner ring of the rear bearing from the gear shank
Remove the drive gear adjusting ring
With a drift we knock out the outer ring of the front bearing
Take out the ring.
Similarly, we knock out the outer ring of the rear bearing
Before assembly, we wash all parts in kerosene or diesel fuel and inspect them
Any cracks are unacceptable on the parts. Gear teeth should be free of scuffing, chipping and heavy wear.
The bearings should rotate easily without clicking or binding. On rollers and rings, chipping, chips and heavy wear are unacceptable.
Bearing cages must not be torn or deformed.
We replace damaged and worn parts. In any case, after a run of more than 100 thousand km, we recommend replacing the bearings, regardless of their condition.
When disassembling the axle, be sure to mark the parts, especially the outer races of the bearings. And when assembling, be guided by the article on adjusting the tightness and contact patch of the gears. Article - GAZ-2705 axle gearbox adjustment
Some drivers complain that it quickly breaks the bearings or the gears of the gear pair quickly fail. In everything, as usual, inattentive assembly and fitting of parts are to blame.
And also the correct running-in of parts. It is imperative that after assembly it is necessary to run in the parts of the axle gearbox. Do not give excessive load in the first 2 thousand kilometers after assembly.