Regularly check the tightening of the bolts securing the final drive to the axle housing. Loosening the bolts causes the crankcase to bend
When adjusting the final drive, adjust the preload of the tapered bearings and check the contact patch in the engagement of the bevel gear pair of the final drive.
Perform adjustment work on the final drive removed from the vehicle.
Control the amount of interference with the moment necessary to rotate the shaft. Determine the moment of resistance to cranking with a dynamometer.
It is necessary to measure the moment on the shaft when turning it smoothly in one direction and after at least five full turns.
It should be borne in mind that incorrect adjustment of the bearings can lead to the destruction of not only the bearings themselves, but also the final drive gears.
Adjust the final drive in the following sequence:
Install final drive in tool, remove differential and flanges.
Remove the pinion gear bearing cup bolts. Remove the pinion shaft with cup and pinion.
Install the drive gear in a vise, holding it by the ring gear.
Remove the bolts securing the cover and remove it.
Unlock the lock nut and unscrew it.
Remove the lock washer and lockwasher. Tighten the nut to a torque of 450-500 Nm (45-50 kgf/m).
Install an indicator tool and determine the bearing clearance.
If there is no gap after tightening the nut, adjusting the cup bearings is not required.
Calculate the reduction in the thickness of the shim 24 (see Fig. 1) (gap value plus 0.03-0.05 mm preload).
Remove the nut, remove the bearing and shim.
Grind (or match) the washer to size, install the washer, and assemble the drive bevel gear bearing assembly. The tightening torque of the nuts is 450 - 500 Nm - (45-50 kgf / m). Lock the locknut by bending the washer on one of the faces.
The torque required to rotate the drive bevel gear in the bearings should be 0.6 - 1.4 Nm (0.06 - 0.14 kgf / m). The force on the dynamometer when unwinding the cord from the surface of the glass is 7.5–17.5 N (0.75–1.75 kgf) (Fig. 2).
Adjust the intermediate shaft bearing preload. Adjust the bearings by selecting a package of gaskets 8 (see Fig. 1) under the cover 9 of the glass 5. The torque required to rotate the intermediate shaft should be 0.9-1.5 N.m (0.09-0.15 kgf / m).
When measuring torque with a dynamometer, wind the cord around the crown of the spur gear, the dynamometer reading should be in the range of 18.7-31.2 N (1.87-3.12 kgf).
It should be borne in mind that with the removal of the gaskets from under the cover of the glass, when adjusting the bearings, the driven bevel gear shifts in the direction of reducing the side clearance, therefore, to maintain the clearance under the glass of 5 bearings, install additional gaskets.
Install the cup with the drive bevel gear into the final drive housing.
Tighten the glass fastening bolts with a torque of 60-80 N (6-8 kgf).
Check that the bevel gears mesh properly with the paint. The length of the imprint must be at least 60% of the length of the tooth (table).
The imprint should be no closer than 5 mm to the edges of the tooth. In this case, the lateral clearance in the teeth (near the wide part) should be 0.1-0.4 mm.
To change the backlash of the bevel gears without distorting the contact, move both gears a distance proportional to the number of teeth on each gear, i.e. move the driven bevel gear 2.2 times (24:11) further than the drive gear.
Install the differential and adjust the differential bearings. Tighten the bolts of the differential bearing caps with a torque of 250 - 320 Nm (25 - 32 kgf / m).
Adjust differential bearings with nuts 37 (see Fig. 1). After tightening the nuts, the distance between the differential bearing caps should increase by 004-0.14 mm.
While adjusting, rotate the differential to install the rollers in the bearings. The crown of the driven spur gear must be located symmetrically relative to the crown of the drive gear.
To determine the contact patch on the working surfaces of the three teeth of the drive bevel gear, apply a thinlayer of oil paint.
Then, rotating the drive bevel gear shaft by the splined end in both directions, achieve a clear imprint of the contact patch on the forward and reverse sides of the three to five teeth of the driven bevel gear.
The contact patch on the tooth of the driven bevel gear should be located closer to the narrow end of the tooth and not reach the edge by 1.5 - 8 mm (Fig. 3).
In this case, the side gap between the teeth (near the wide part) should be 0.1-0.4 mm. Check the clearance value for at least three teeth of the driven bevel gear located at equal distances along the circumference.
See the table for ways to correct the contact patch and achieve proper gear engagement. According to the recommendations given in the table, the correct engagement is achieved by axial movement of the driven and driving bevel gears.
Move the drive bevel gear by changing the thickness of the shim pack. The set of shims produced by the plant consists of three standard sizes with a thickness of 0.22; 0.1 and 0.05 mm.
Move the driven bevel gear by changing the thickness of the package of shims 4 installed between the flange of the cup 5 of the bearings and the gearbox housing.
After completing the adjustment, install the bearing caps with gaskets and secure them with bolts.
Using a mandrel, press the flanges onto the splined ends of the drive bevel gear shaft, tighten and cotter the flange fastening nuts.
The cotter pin installed in the hole of the rear end of the drive bevel gear shaft must be located in the direction of the straight edge of the flange (i.e. when installing the flange, it is necessary to orient it relative to the shaft hole for the cotter pin).
The orientation of the flange on the shaft is provided to prevent contact between the cotter pin and the yoke of the cardan shaft being installed.
|
Position of the contact patch on the wheel |
How to achieve proper gear engagement |
Move direction toothed rings |
|
|---|---|---|---|
|
Forward travel |
Reverse |
||
|
|
|
Correct contact |
|
|
|
|
Move the gear to the pinion. If this results in too small a bokovy backlash between teeth, move gear |
|
|
|
|
Move the cogwheel away from the pinion. If this results in too much backlash between the teeth, move gear |
|
|
|
|
Move the gear to the wheel. If the backlash is too small, move the gear back |
|
|
|
|
Move gear away from wheel. If the side clearance is too large, move the cogwheel. |
|
1
1
1
2
2
2
3
3
3
4
4
4
5
5
5In connection with the improvement of the manufacturing technology of differential gears, the tooth profile of the satellite side gear has changed.
Changed gears are not interchangeable with previously manufactured gears and should only be replaced as a complete set. For distinction marks were introduced on the side of the small module: a groove with a diameter of 90 mm on the gear of the axle shaft and a stepped end on the satellite.
Adjust the bearings of the steering knuckles during the sixth maintenance -2 (after 96,000 km) in the following order:
- - remove the wheels and place the stops under the lower covers of the steering knuckles;
- - remove the steering knuckle levers;
- - remove two gaskets from the package of gaskets under the levers: one 0.05 mm thick, the other 0.1 mm thick; put 50 g of lubricant Litol-24 GOST 21150-87 into the cavity of the levers and install the levers in place; tighten the nuts to a torque of 110–140 Nm (11–14 kgf/m);
- - remove the stops and remove the covers;
- - remove a 0.15 mm thick [(0.05+0.1) mm] gasket pack from under each cover;
- —install the covers and tighten the nuts to a torque of 110—140 Nm (11—14 kgf/m);
- - install the wheels.
Wheel bearing adjustment:
- - jack up the axle from the side of the adjustable wheel;
- - remove the lid;
- - use a puller to disengage the splines of the axle shaft from engagement with the hub and remove the axle shaft;
- - unscrew the outer nut and remove the lock and lock washers;
- - rotating the wheel by hand, make sure that there is no friction of the brake drum on the pads;
- - tighten the nut to a torque of 200-250 Nm (20-25 kgf / m), when tightening the nut, turn the hub to self-align the rollers in the bearings, then loosen the nut by about 1/5 - 1/6 of a turn. Install the lock washer.
If the pin of the nut does not match the slots of the lock washer, it is allowed to loosen the nut by an amount not exceeding the distance between two adjacent slots.
Install the lock washer, tighten the locknut to 400-500 Nm (40-50 kgf/m) and lock it.
To ensure the connection of the wheel inflation hose to the wheel valve, install the axle shaft with the hub cover so that the inflation hose is located in the direction of the wheel valve symmetrically between the wheel studs.
After completing assembly, check the wheel bearing adjustment during a run of 10 - 20 km.
When properly adjusted, the hub should be cold or slightly warm. If the hub feels warm to the touch, check the bearing adjustment.
On domestic vehicles, wheel hub bearings 2007124A can be installed, which are not interchangeable with bearings 2007124M.
The wheel hub with the outer races of bearings 2007124A pressed into it is marked with an annular groove on a diameter of 220 mm, 2 - 4 mm wide, at a distance of 38 mm from the end face under the hub cover.
The assembly of the hub with the outer races of bearings 2007124A and inner races of bearings 2007124M pressed into it (and vice versa) is not allowed.
Cup for bearing 2007124M cannot be used with bearing 2007124A.
Cuff holder for bearing 2007124A can be used with bearing 2007124M.
The collar used with bearing 2007124А has an enlarged groove for the cage (175 mm instead of 172 mm in diameter).
It is not allowed to assemble cuff cages with bearings that do not match them. Wheel hubs complete with bearings are interchangeable.