Do-it-yourself front gear repair on a Chevrolet field

In detail: do-it-yourself repair of the front gearbox on a Chevrolet field from a real master for the site my.housecope.com.

Dismantling and assembly of the gearbox of the front axle Niva Chevrolet

Before disassembling, we clean the gearbox from dirt, preventing it from getting inside the gearbox.

. remove the cover of the left bearing of the differential box.

To remove the right bearing cover, screw the bolt into the hole for securing the lock plate.

The connection is sealed with a sealant. Checking the technical condition of the parts see the section "Disassembly and assembly of the rear axle reduction gear" (p. 234). In addition, we check the condition of the ball bearings of the housings of the internal hinges of the drives. Bearings should not be damaged on the raceways of the rings, on cages and balls, as well as cracks and chips on the rings. The radial clearance of the bearings must not exceed 0.05 mm. There should be no cracks or signs of wear on the seats of the gearbox housing. We replace the worn out and damaged parts with new ones.

Press in the new outer rings of the pinion gear bearings with a piece of pipe or a tool head of a suitable size.

Assembly and adjustment of the front axle reducer are similar to the operations described in the section "Disassembly and assembly of the rear axle reducer" (p. 234). When installing a new pair of main gears, make sure that their gear ratio (marking on the gears - 2106) is equal to the gear ratio of the main pair of the rear axle reducer.

To set the preload of the differential box bearings, we consistently and evenly tighten both bearing adjusting nuts so that the distance between the covers increases by 0.08-0.11 mm. We clean the mating surfaces

Video (click to play).

cover and gear case from residues of sealant and oil. Replace the gasket of the front cover of the gearbox housing with a new one. We install the lower cover of the gearbox housing with sealant.

Before disassembling, we clean the gearbox from dirt, preventing it from getting inside the gearbox.

Using a 10 spanner spanner, unscrew the eight nuts securing the front cover to the gearbox housing.

Using the "10" head, unscrew the bolt securing the locking plate of the left bearing cover of the differential box and remove the plate.

Remove the right cover lock plate in the same way.

Using the "19" head, unscrew the four nuts securing the differential box bearing caps.

… Remove the cover of the left bearing of the differential box.

To remove the right bearing cover, screw the bolt into the hole for fixing the locking plate and, pulling the bolt, remove the cover.

We take out the adjusting nuts.

Remove the differential box assembly with the driven pinion of the final drive.

Removal of the driven gear and disassembly of the differential of the front axle reducer are similar to the corresponding work described in section "5.7.19 Disassembly and assembly of the rear axle reducer". We remove the oil seal of the drive gear of the main transfer from the housing of the reducer (see "5.6.3 Replacing the oil seal of the drive gear of the front axle reducer").

Remove the oil deflector from the drive gear shank.

We take out the inner ring of the rear bearing of the pinion gear with a cage and rollers.

We take out the drive gear with an inner ring, a cage, a spacer sleeve and front bearing rollers.

Striking the punch with a hammer, knock out the outer ring of the front bearing and take out the ring.

Likewise, dismantle the outer ring of the rear bearing.

If oil is leaking from under the lower cover of the front axle gearbox housing, use the "13" key to unscrew the eight bolts of its fastening ...

The connection is sealed with a sealant.

Checking the technical condition of the parts see section "5.7.20 Checking the technical condition of the gearbox parts", "5.7.26 Checking the contact of the working surface of the teeth of the main drive gears". In addition, we check the condition of the ball bearings of the housings of the internal hinges of the drives. Bearings should not be damaged on the raceways of the rings, on cages and balls, as well as cracks and chips on the rings. The radial clearance of the bearings must not exceed 0.05 mm. There should be no cracks or signs of wear on the seats of the gearbox housing. We replace the worn out and damaged parts with new ones.

Press in the new outer rings of the pinion gear bearings with a piece of pipe or a tool head of a suitable size.

Assembling and adjusting the front axle gearbox are similar to the operations described in "5.7.21 Assembling the gearbox", "5.7.22 Installing and adjusting the drive gear", "5.7.23 Adjusting the bearings of the drive gear", "5.7.25 Preloading the differential box bearings and adjustment of the lateral clearance in the meshing of the main gears ”. When installing a new pair of main gears, make sure that their gear ratio (marking on the gears - 2106) is equal to the gear ratio of the main pair of the rear axle reducer. To set the preload of the differential box bearings, consistently and evenly tighten both bearing adjusting nuts so that the distance between the covers increases by 0.08–0.11 mm. We clean the mating surfaces of the covers and the gearbox housing from the remnants of the sealant and oil. Replace the gasket of the front cover of the gearbox housing with a new one. We install the lower cover of the gearbox housing with sealant.

Adjusting the front axle of the niva is one of the key operations that ensures comfortable and trouble-free travel on roads of any quality.

The need to adjust the elements of the front axle is assessed by the presence of noise and vibrations that occur in various operating modes of the VAZ 21214. So, conditionally acoustic signs can be divided into two groups:
• Registered constantly;
• Fixed when braking with internal combustion engine or acceleration.

By nature, sounds can resemble:
• Howl (wear of the main pair);
• Crunch, "trolleybus" hum (destruction or hauling of the shank bearings, loose nut of the drive shaft, axle shaft bearings, incorrect adjustment of the gears of the main gearbox);
• Intermittent "scuffing" (differential bearing).
The complexity of diagnostics in this case lies in the abundance of extraneous noise emitted by other parts of the car.

To carry out adjustment work on the front axle, the manufacturer provides special pullers, mandrels and devices. However, due to their limited distribution and high cost, their presence is not necessary, although it is desirable to save time and accuracy of tuning.
Since the main parts of the RPM correspond to similar elements of the REM, the correspondence of the technological clearances and the procedure for carrying out repair operations is traced.

The main stage is preceded by preparation, including:
1. Drain the oil from the RPM through the drain hole;

2. Disconnecting the propeller shaft with a key 13

3. Removing the right wheel drive.

4. Dismantling the lower ball joint on the left side.

5. Removal of suspension braces.

6. Removing the gearbox from the brackets on the right and left using the stop.

This is followed by disassembly of the gearbox, thorough cleaning of surfaces from dirt and grease, and troubleshooting of components.

To carry out the operation, the original device A.95690, mandrel A.70184 or an analogue made according to the drawing are used.

The seating plane of the crankcase is positioned so that it takes a horizontal position. Then an absolutely flat metal bar is installed on the bearing bed.The distance from the bar to the mandrel is measured by inserting the adjusting rings from the set in increments of 0.05 into the gap under the bar. The measured value (base of the crankcase) is consistent with the correction applied to the pinion.
When reassembling the assembly, it is recommended that the standard spacer be discarded to prevent re-repair. Instead, a non-deformable steel sleeve with a length of 48 mm is suitable (with a margin, if necessary, shorten it).

During turning, the parts control the force when turning the gear (should be 157-196 N · cm), for bearings with mileage, a torque of 39.2–58.8 N · cm is valid. The use of a proprietary dynamometer 02.7812.9501 is optional.

Acceptable accuracy will be ensured by a household balance wheel. When working with it, wind one end of a 1 m long cord around the flange, and fasten the other to the balance. Lock the torque by pulling the device in a perpendicular direction. So, new bearings should provide 7-9 kg, and with mileage - 2-3 kg.

The process involves replacing the support washers with new ones - thicker than before. A choice of 7 standard sizes with a step of 0.05 mm in the range of 1.8-2.1 mm. Washers material - bronze or steel. In this case, the gears are installed tightly, but with the ability to turn manually.

In accordance with the instructions, the lateral clearance and bearing preload are adjusted using the A.95688 / R tool.

In its absence, a vernier caliper of a suitable size will perform the given role.

To ensure the required preload, the distance relative to the bearing caps is recorded at the beginning of the tightening and at the end of it. The required difference between the values is 0.2 mm.

The side clearance is adjusted by bringing the driven gear to the leading one until it disappears. Initially, one of the nuts is in a free position, the other (working) is tightened. After eliminating the gap, gradually tighten the baited nut until the jaws of the caliper move apart by 0.1 mm.
The backlash adjustment stops when a slight knock of the teeth appears. Then both nuts are evenly tightened to a distance of 0.2 mm. The correctness of the work performed is evidenced by a uniform backlash at any position of the gears.

4WD vehicles make more efficient use of the engine's power output. The presence of all-wheel drive increases the handling of the Chevrolet when driving on slippery surfaces and significantly improves off-road passability.

Torque is supplied to the gearbox (GB) and transfer case of an all-wheel drive vehicle. From there, the force is directed to the front and rear axles. The NIVA cardan transmission provides torque to the axles.

Gearboxes are installed on the axles, which translate the movement of the propeller shaft into rotation of the half-axles of the wheels.Both units of the front and rear axles of Chevrolet have a similar design: the drive and driven gears are located at right angles to each other. The gears of the reducer are equipped with specially shaped teeth, and their design facilitates the maximum transfer of forces between the shafts.

The gearbox itself is covered with a cast aluminum casing, closed with a metal cover. The gears are housed in a sealed space filled with gear oil, which lubricates the interacting parts and dissipates heat.

Reducers installed on NIVA vehicles must be marked with a gear ratio.

Each gearbox for NIVU has a specific marking:

2101, 2102 (not produced);
2103 with a gear ratio Z = 4.1, which means 10 teeth at the drive gear, 41 teeth are located on the driven gear;
2106 with a gear ratio Z = 3.9, i.e. 11 teeth at the drive gear, 43 teeth on the driven gear.

Marking 2103 indicates that these are faster gearboxes, and 2106 - more traction.

When replacing one of the nodes, it is necessary to pay attention to the value of the gear ratios: they must be the same for the front and rear axles.If the gear ratios are different, then the wheel axles rotate at different speeds. One gearbox breaks down quickly.

The markings of the front and rear units of the NIVA vehicle must match and have the same gear ratios. If units marked 2101, 2102 were previously installed, replacing it with a part with a different marking (2103, 2106), then both gearboxes must be replaced.

The need to remove this part of a NIVA car usually arises if there are signs of a malfunction, and the part needs to be repaired or replaced. When disassembling, assembling or repairing a gearbox, you must use specialized equipment. Appropriate skills are also required. If necessary, it is better to contact a car repair shop.

First, the NIVA is driven onto a lift or a viewing hole, you can disassemble and dismantle the gearbox. Filmed:

Anti-roll bar;
Protective plate for the engine crankcase;
Suspension cross members.

The shock absorbers are disconnected from the lower suspension arms;
The flange of the drive gear is disconnected;
The front driveshaft of the Chevrolet is removed;
The suspension spring is compressed, separate the ball joint and the lower arm;
Remove the spring;
Disconnect swivel arms and steering linkages.
Remove the cap;
Unscrew the bearing nut from the wheel hub.

On the other side of the NIVA car suspension, all operations are performed in the same sequence. Then you need to do the following:

The clamp that tightens the joint of the muffler pipe and the front pipe is loosened;
The suspension of the mufflers with pipes on the gearbox is disconnected;
The nuts holding the front exhaust pipe to the exhaust manifold are unscrewed;
Remove the pipe down;
The nuts are unscrewed, with which the cross members of the suspension of the pillows are attached to the brackets;
Unscrew the bolt with which the right bracket is attached to the engine;
The front axle is supported, the nuts securing it are unscrewed;
Chevrolet engine rises 25-30 mm;
The axle and front wheel drives are removed.

Disassembly is carried out in the following sequence:

The front axle is installed and secured on a stand designed for repair work;
The plug opens and oil is drained from the Chevrolet crankcase;
Unscrew the nuts securing the bearing cover at the inner hinge housing;
The hinge is removed very carefully (so as not to damage the sealing gasket);
Remove the retaining ring with a spring washer;
Press the bearing off the inner joint housing;
Remove the oil seal;
The stamped cover and the gasket of the axle housing are removed (the bottom cover cannot be removed);
The front axle gearbox is disassembled.

The assembly of the bridge on the NIVU takes place in the reverse order of removal. During installation, the gearbox is placed in place. Bolts and nuts must be tightened with torque. Transmission oil is poured into the front axle housing through the oil filler hole. The oil must not go over the bottom edge of the hole.

When the rear axle overheats or noises come from it, then the gearbox needs to be repaired. It is not recommended to remove the Chevrolet gearbox on your own in the garage, because it is very difficult to determine the gap between the gears.If it is not possible to repair the gearbox in a car workshop, then it is better to replace this part entirely:

Install the NIVU on a pit or overpass;

Oil is drained from the rear axle;

Disconnect the propeller shaft from the drive pinion flange;

Dismantle the axle shafts on the Chevrolet;

Unscrew the rear axle gearbox bolts at the beam;

Remove the rear axle gearbox.

Image - Do-it-yourself repair of the front gearbox on a Chevrolet field

Unscrew the drain plug of the front gearbox housing and drain the oil into a container, then screw the plug back

Unscrew the filler plug and fill with new gear oil using a syringe to the level of the lower edge of the filler hole and screw in the filler plug. This completes the replacement of the transmission oil on the Chevy.

The oil seal must be replaced with a new one when an oil leak is detected; to replace it, you will need a 13, 24 wrench, a screwdriver, a torque wrench and a hammer. Before replacing the oil seal of the front gearbox shank on the Niva, turn off the gear and stop the engine, drain the oil from the front axle housing and disconnect the Chevy front propeller shaft from the flange of the drive gear of the front axle gearbox. Disengage the housings of the inner hinges of the front wheel drives from mesh with the gears of the axle shafts of the front axle reducer. Determine the moment of resistance to rotation of the pinion flange nut and replace the oil seal. Install the removed assemblies and parts in the reverse order of removal and fill the gearbox with oil.

Prepare a hammer, barb, circlip remover and sealant before starting work. To replace the bearing and the oil seal of the inner hinge housing, it will be necessary to remove the front wheel drive and then

Remove the bearing retaining ring, use a hammer and a wooden spacer to knock down and remove the housing and bearing from the shaft

Using a hammer and a barb, remove the front wheel inner CV joint oil seal

Lubricate the lip of the oil seal with gear oil, and apply a thin layer of sealant to the outer surface

Then, using a hammer, carefully press the oil seal into the body, install the removed parts in the reverse order of removal, if necessary, replace the old Chevrolet Niva CV joint bearing with a new one.

The gearbox of the front axle of a Chevrolet Niva is removed for replacement or repair. However, disassembling, adjusting and assembling the gearbox require the use of special equipment and require the skills of the performer. Repairing a Chevrolet gearbox in a garage almost never leads to the desired result. Therefore, if you need to repair the gearbox, use the services of a specialized workshop. In order to remove the gearbox, prepare a wrench for 13, 17, 27, a hexagon for 12, a ballon, a chisel, a hammer, a syringe for filling transmission oil and a container for oil.

Remove the front wheels and drain the oil from the front axle gear case. Disconnect the front propeller shaft from the front axle gearbox

Unscrew the nut and remove the bolt securing the left bearing cover of the Niva Chevrolet gearbox of the front axle to the front suspension cross member. Remove the right front wheel drive and unscrew the three nuts securing the bearing cover of the left drive inner joint to the front axle gearbox

Unfold the steering knuckle to pull the actuator with it, disconnect the gearbox from the actuator and remove it. Installation of the gearbox of the front axle Niva Chevrolet and the removed parts are performed in the reverse order of removal, then fill the gearbox with oil.

Chevrolet Niva has a front axle, which includes a differential and a main gear, which are installed in one crankcase, which has a cast housing that is closed by a cover and sealed with a gasket, which is exactly the same as the rear axle. According to the regulations, it is necessary to change the oil in the gearbox every forty-five thousand kilometers.

Periodically, you have to remove the front axle gearbox, the Chevrolet Niva requires timely maintenance.

To make a replacement or repair, the gearbox must be removed, and in order to do this you need to have the necessary skills and tools, so if you do this in the garage, then most likely you will not achieve the desired result. Therefore, if it comes to replacement or repair, then the best option would be if you contact a specialist. If, nevertheless, you decide to make the replacement yourself, then you will need a certain set of tools:

Hexagon twelve
Keys 17, 27, and 13
Chisel hammer
Any syringe so that it is convenient to fill in the gear oil, it is also advisable to prepare any container to drain the used oil there.

When the entire tool is at your fingertips, you can start removing:

First of all, we remove from the car 2121 or another, the front wheels
Berm container and there we drain the used oil from the front axle of the gearbox
Then, from the front axle of the gearbox, we disconnect the front propeller shaft
We unscrew the nut and take out the mounting bolts
Remove the drive from the front wheel
At the pepper front suspension, unscrew a few nuts that secure the cover of the inner hinges of the left drive
We unfold the steering knuckle so that we pull the drive along
Disconnect the wires from the gearbox
We take it off
Then we change the oil
When the replacement procedure is completed, everything is installed in the reverse order.

To save fuel, on hard and dry roads, the front axle can be disabled on the Chevrolet Niva. But in order to achieve the greatest savings, the manufacturer recommends that the movement be permanently driven, but at a moderate speed. But if you do decide to disconnect, then make the movement, avoid mud, snow, sand, and try to tow a trailer or towing on steel couplings. By disabling the front axle, you will ensure a reduction in mechanical losses in the transmission, thereby wear of tires and gearbox.

Repair of the front gearbox VAZ 21213 Niva

ABOUT NIVA! Malfunctions in the transmission and backlash in the front drives of the VAZ Niva 21213! Elimination!

Chevrolet Niva Luvt in the front axle

Another year ran off without noise and backlash

Tools:

Spanner straight 13 mm
17 mm straight spanner
19 mm box spanner
Chisel
Small hammer
Collar for end attachment
Extension for end wrench
Driver attachment 13 mm
Wrench attachment 17 mm
Wrench attachment 19 mm
Wrench attachment 27 mm
Gear oil filling syringe
Waste oil container
12mm hexagon wrench
Adjustable stop
Pliers

Parts and consumables:

Sealant
Transmission oil
Internal hinge bearing cap gaskets
Rags
Aerosol grease type WD-40

We carry out the work on a viewing ditch or overpass. Remove the front wheels.

The front axle gearbox can be dismantled in two ways:

- With preliminary removal of front wheel drives or complete with drives:

1. Drain the oil from the front axle gearbox as described.

When dismantling the gearbox in the first way, we remove the front wheel drives, as described.

2. Remove the right front wheel drives.

3. Remove the left front wheel drives.

In this case, the gearbox remains suspended on the adjustable stop.

4. Supporting the gearbox, remove the adjustable stop from under it.

5. We remove the gearbox.

- When removing the front axle gearbox in the second way:

1. It is necessary to carry out the same operations, with the exception of loosening the nuts that secure the bearing caps of the housings of the internal hinges of the drives, to the casing of the front axle gearbox, as described.

2. Disconnect the middle tie rod ball pin from the swingarm or from the steering bipod as described.

3. Remove the front axle reduction gear assembly with drives.

4. Install the gearbox in reverse order.

5. Fill the gearbox with oil.

We wash the outer part of the gearbox, prepare the keys for repairing the gearbox.

1. Having installed the gearbox on the workbench, use a 10 key to unscrew the two bolts securing the locking plates of the differential bearing nuts and remove the plates.

2. With a core, we apply marks on the bed and the corresponding bearing cap in order to install the caps in place during assembly.

3. Using the "17" wrench, unscrew the bearing cap fastening bolts.

4. Remove the outer bearing rings and adjusting nuts from the differential housing.

If we do not change the bearings, then we mark the outer rings so as not to confuse them during installation, because the bearings have been individually worn in and it is undesirable to dismantle them.

5. We check the absence of radial backlash in the gears of the axle shafts.

6. Press the inner rings of the bearings with a puller.

7. Using the "17" wrench, unscrew the eight bolts securing the driven gear to the differential housing and remove it.

8. Knock out the axis of the satellites with a beard.

9. Turn the axle gears and take out the satellite gears.

10. We take out the gears of the axle shafts with the adjusting washers, marking their position.

11. We take out the drive gear and the deformed spacer sleeve from the crankcase. When assembling the gearbox, replace the bushing with a new one.

12. Using a soft metal drift, knock the inner ring of the tapered bearing off the pinion shaft.

13. An adjusting ring is installed under the bearing, which ensures the correct mutual position of the main gears.

14. Use a suitable tool to knock the outer races of the tapered bearings out of the crankcase.

We thoroughly wash the gearbox parts in kerosene and carefully inspect them. If at least one tooth is damaged (chipping, waves, risks, seizure marks on the working surfaces), replace the gears with new ones.

The edges between the tops and working surfaces of the driven gear teeth must be sharp. If the slightest nicks or roundings are visible, replace the main pair with a new one.

Video (click to play).

Minor damages to the satellites axle, semiaxis gear necks and their mounting holes are removed with fine sandpaper, followed by polishing. When assembling, the collar, flange nut and spacer sleeve are replaced with new ones.

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