We continue to study the design of the car. Today is the rear wheel hub. A hub is a round piece with a hole in the center for connecting to a shaft or axle, and with a keyway or splines for torque transmission.
Hub functions
The main part of the vehicle undercarriage assembly, which experiences the greatest loads, is the hub, both front and rear. Because it is an intermediate part that connects the wheels and suspension of the car. If this important part breaks down, there is a threat to all road users.
Each wheel has its own hub. The wheel is rigidly attached to the hub and rotates around its axis, while the hub is rigidly attached to the suspension of the machine.
Depending on which drive the car has, the functions of the hub are different. If the car has rear-wheel drive wheels, then the rear wheel hubs perform an additional function - this is the redistribution of torque from the crankshaft to the wheel. It turns out that the rear hub of such cars is an element of the transmission, and not just a running gear.
Such parts are attached to the wheel hub - brake discs or drums. Drums are installed on inexpensive machines.
Therefore, another function of the rear wheel hub is to provide braking. In addition, the hub serves as an installation site for various sensors (speed, ABS, control and other technical indicators) that are stuffed with modern cars.
Here are the functions of the rear hub:
- Ensuring rigid reliable fixation of the wheel to the suspension.
- Ensuring the rotation of the wheel around its axis.
- Holds anti-lock and brake systems.
- Serves as a mounting location for various sensors.
Rear hub device
The design of the rear hubs is different whether the car is front wheel drive or rear wheel drive. The hub is a rounded metal part with an outer rim with many small holes and one large inner hole. The outer rim with holes is needed to mount the wheel. Guide bolts and studs are screwed into the holes, on which the wheel axle is fixed. The wheels are mounted, basically, either on 4 bolts, or on 5, but there are also up to 8 bolts.
The inner hole of the hub is designed to fit on the bearing. is installed in the hole in it. Some hubs have multiple locations for electronic sensors for ABS, speed, etc.
All hubs are attached with two bolts and one washer. The hub sits through the bearing on the trunnion. The trunnion is also a very important part in the chassis of a car. Bearings are used rolling roller or conical.
Rear wheel hub failure
To avoid serious breakdowns allows timely diagnosis and, if signs of a malfunction are detected, their quick elimination.
What breaks hubs:
- A sporty driving style, that is, with jerks, with, with turns at high speeds, as well as fast driving over bumps.
- Vehicle overload.
- Getting stuck in the mud and snow when the car sat on the bottom.
During such operation of the car, the hub housing may crack and the bearing may jam.
Symptoms
Options for self-diagnosis:
- When cornering, it is especially audible if the hub bearing begins to fail.
- Push the rubber of the wheel across with your foot to determine if there is any play. If there is play (free play), then it's time to change the hub.
- If there is a rumble in the area of \u200b\u200bthe wheel. In this case, it is necessary to raise the car with a jack and check the wheel for play. In this case, the sounds of a crunch, a creak are possible. When such a hum appears, it is impossible to operate the car further, because the hub or bearing has already worn out to the maximum and at any moment the wheel can jam.
When changing a wheel, check the hub at the same time. If it is replaced, care must be taken not to break the thread when tightening the rear wheel hub bolt.
Rear hub replacement tools
To remove the hub, you will need the following tools:
Hub replacement procedure:
- Loosen wheel nuts.
- Raise the car with a jack. Place supports for insurance. Place recoil devices (shoes).
- Remove the decorative cap (wheel center).
- Unscrew the wheel nuts.
- Remove the brake drum from the hub or remove the disc brake caliper.
- Unscrew the bolts securing the hub to the bracket. The bolt is unscrewed through a special hole in the hub itself. To gain access, turn the flange until the holes line up with the bolts. These nuts are tightened with a high torque, so it is not so easy to unscrew them.
- Unscrew the caliper mounting bolts, the steering knuckle mounting bolts and the brake shoe guides.
- Pull out the hub. The rear hub is removed from the bearing. Need a special puller to press the hub from the bearing.
Video
How to replace a Nissan X-Tail wheel bearing (Nissan Ixtrail).
How to change rear hub.
Replacement of the rear hub for VAZ 2108, 2109, 2110, 2110, 2112, 2113, 2114, 2115, 2170, 2172, KALINA, PRIORA, GRANT.
How to repair a VAZ hub.
Replacing the rear wheel hub on Skoda A5 (Skoda A5).
The axle or axle shaft (call it what you want) of the rear hub on VAZ 2110-2112 cars changes in exceptional cases. This is done either when the thread is damaged, when it can no longer be restored, or after an accident as a result of curvature, which is also extremely rare. If suddenly you had to face a similar problem, then the procedure for replacing the axle shaft will be discussed below.
First, consider the list of tools needed for repair:
- Socket head 17 mm
- Extension
- Ratchet handle
- Vorotok
- Hammer
- Phillips impact screwdriver
- Penetrating lubricant
How to remove the rear hub axle on the VAZ 2110, 2111 and 2112
It is worth noting the fact that before proceeding with this procedure, it is necessary to perform some preparatory work, such as:
- Removing brake pads (read in the article -)
After that, nothing will interfere with us and we can proceed directly to the work itself. The first step is to apply a penetrating lubricant to the axle mounting bolts. And after that we try to pluck them with a powerful wrench, as shown in the photo below:
When the bolts are torn off, you can finally unscrew them with a ratchet to make it faster and more convenient:
When this is done, we try to disconnect the axle along with the brake casing from the rear beam. Usually the axle sticks to such an extent that a hammer is indispensable. In this case, on the reverse side, apply a penetrating lubricant to the junction of the casing and the beam.
Then we wind a little nut onto the axle thread and slowly tap it with a hammer, as is clearly shown in the photo below:
Usually, after a couple of blows, the casing, along with the axle, bounces off the beam. Now you need a Phillips power screwdriver to unscrew the two bolts from the back:
And now you can carefully knock the axle out of the brake casing by hitting it several times with a hammer:
And the final result of the work done is shown in the photo below:
Installation takes place in the reverse order and difficulties should not arise. As for the price of this part, it can vary from 400 to 600 rubles apiece.
The running system performs many functions, the main of which is ensuring the controllability of the car. To make the machine maneuverable and safe, it is equipped with a special steering knuckle and a hub between the axles. In order for them to be as reliable as possible, they include two bearings each. Both parts may differ in size and cost, but their design remains unchanged. Both the front and back are tapered. Although some motorists claim that the rear hub bearing is easier to operate than the front one. To finally find out the answer to this question, in today's article we will consider all the features of this part.
First, let's look at the design of this element. As we have already found out, the rear hub bearing has a conical shape. So - it is attached to the axis with a special thrust nut or washer. The more this part is tightened, the tighter the rollers will be pressed. Thanks to this, the possibility of backlash of the mechanism can be excluded.
So why is a rear hub bearing easier to operate?
The design of the front and rear parts are very similar to each other, but there are some differences. The fact is that the rear hub bearing does not have therefore it is easier to operate. Now several types of these parts are installed on cars:
- deep groove ball bearings (most often for machines with dependent suspension);
- conical (for independent).
The first mechanisms differ from the second ones in that they do not have the ability to adjust the degree of pressing the rollers to the clips. They are much cheaper, and you can buy them absolutely in any town.
Why does a rear wheel bearing fail?
It often happens that this part fails due to road dust that has got into its body. This can be due to leaking oil, but most often it happens due to water getting onto the hub. Well, no one is safe from hitting a puddle. So it turns out that it’s best to have a couple more such details in your trunk so that at one fine moment you don’t have to go home on a tow truck. But having a set of new parts with you is half the battle. You also need to know how to change the rear wheel bearing. Therefore, below we will give a small instruction on the removal and installation of this part.
rear wheel - step by step process
First, remove the protective cap of the hub fastening nut and lower the tightening of the wheel bolts and the mechanism itself. After that, we take a jack and raise the car by 5-10 centimeters. In this case, do not forget about additional supports. Next, turn on the first gear and put the substrate under the front wheels. Then remove the wheel and pads. Next, using a puller, we dismantle the hub from the trunnion and the inner race of the bearing. The next step is to remove the retaining ring and then the bearing itself. All mechanisms are thoroughly washed, and a new part is pressed into the hub. The rear wheel bearing is installed in the reverse order.
It's no secret that any car, whether it's foreign or domestic, over time has a tendency to break down. Only the component parts of the unit fail, as a result of which the car cannot be operated. Such a breakdown as a malfunction of the rear hub bearing on a VAZ-2107 car hides dangerous consequences. After all, if this part malfunctions, the car can theoretically be operated, but at the same time, you can lose the wheel on the way at any time. In the material, we will pay attention to the features and principle of replacing the rear wheel hub bearing on a VAZ-2107 car.
Every detail on a car tends to become unusable. Rear hub bearings are no exception, but any part has characteristic performance features. If the operating conditions are met, then the part can serve for years, which is confirmed by the driving experience of today's older drivers.
The main causes of bearing failure are:
- careless driving;
- improper installation of the product;
- ingress of water and dust into the hub;
- leakage of lubricant;
- long service life.
If the VAZ-2107 car is often operated in aggressive conditions close to off-road, then the need to replace the rear hub bearing will not be long in coming. It is especially important to take into account the fact that the famous "seven" is a rear-wheel drive car. But how to determine that the hub bearing is out of order and needs to be replaced? Let's find out in more detail.
Ways to determine the failure of the wheel bearing
Timely detection of a malfunction helps prevent unpleasant consequences that can provoke an emergency on the road. The part under consideration on the VAZ-2107 car plays an important role, since thanks to this product, the wheel rotates easily. The car has 2 rear wheel bearings, one for each rear wheel.
The main way to determine the malfunction of an important part of the hub on the VAZ-2107 is to carry out the following manipulations:
- raise the rear of the car on a jack;
- shake the outer part of the wheel in different directions;
- if a knock occurs and the wheel dangles, then the VAZ-2107 rear wheel bearing needs to be replaced.
If the car drives while cornering and a creak appears, this also indicates the need for repair work. To replace the wheel bearing, you will need the following tool:
- domktat,
- wrenches and screwdrivers,
- chisel and hammer
- puller,
- Lubricant brand "Litol".
After making sure that you have a complete list of tools and materials for the work, you can start replacing.
Replacement of a failed product
It is necessary to start replacing the product by loosening the wheel bolts. This must be done before the rear of the car is jacked up. When doing this, do not forget to install stops under the front wheels.
Further actions are performed in the reverse order of removal. At the same time, it is important not to forget that when replacing the bearing, the sealing glands must also be replaced.
The rear hub is designed to connect the movable wheel and the suspension element - the beam. The design of the hub can be compared to a small glass made of metal. A specially designed bearing is pressed into its inner part. A very simple device, but it can cause a lot of trouble to the motorist - when worn, the bearings begin to buzz a lot. And if you do not replace it in a timely manner, then the balls can completely jam, which will lead to blocking of the wheel and an abrupt stop of the car - when driving at high speed, this will lead to an accident.
Design features
The rear hub 2108 is very different from the similar mechanism used in cars of the "classic" series - VAZ 2101-2107. The design of the rear suspension on front-wheel drive cars is quite simple. The axle shaft is mounted on the beam, it is somewhat similar to the one mounted on the front axle. But one difference is that this element can move in a vertical plane, but it will not work to make a turn - the fasteners are rigid.
The hub itself is a small metal cylinder, hollow inside. A roller is pressed into it - a special bearing, with the help of which the wheel rotates on the axle shaft. Moreover, the outer diameter of this bearing is the same as the inner diameter of the hub. And the diameter of the inner race is the same as the outer half shaft. Consequently, the landing of the hub on the axle shaft is as tight as possible, there are no gaps. This can be understood by just parsing the element once.
Signs and causes of malfunctions
In the 2108 rear hub mechanism, it is the bearing that most often fails - this is the most vulnerable spot. But sometimes more specific breakdowns occur - cracks on the metal surface of the hub, destruction of the thread for the wheel bolts. In the second case, you can not completely change the hub, just cut a new thread. But this does not always help, it turns out to be easier to purchase and install a new one. Therefore, if, when tightening the bolts, they turn on the thread, you need to start repairing immediately, otherwise it may end up with you losing the wheel.
In the event that the bearing wears out, extraneous sounds appear - a strong hum that grows with speed. There may be several reasons:
- Initially poor quality.
- Insufficient amount of grease inside the bearing.
- Incorrect installation.
- Exceeded allowable resource.
In any case, the element needs to be replaced. After the hum reaches its maximum, vibration will begin to appear - and the stronger the wear, the greater its level will be.
What tools are required
Before you change the rear hub or its bearing, be sure that you have all the necessary tools. Without special pullers, it is unlikely that the bearing will be dismantled. If you plan to install a new hub assembly, then there will be no problems - it already has a new bearing, which is installed in accordance with all the rules.
But if you buy all the elements separately, the presence of a puller is highly desirable. You need to have the following tools on hand:
- Jack - preferably rolling type. And be sure to have solid foundations. If there are none, then wooden bars can be used.
- A balloon wrench for wheel bolts is usually a 19, 17 or hexagon head.
- Pliers.
- Socket head for 30 or ring spanner.
- A piece of solid pipe.
- Hammer, chisel, punch.
- Wooden beam or bronze hammer.
- Mounting blade.
- Any design puller for pressing out the wheel bearing.
- A two-legged puller is required.
That's all, you will also need a new bearing and hub nut. It is not recommended to reuse the old one.
What bearings to buy?
The price of the hub assembly for VAZ-2108 cars and similar models is about 1200 rubles. The bearing will cost about 350-600 rubles (depending on the manufacturer and the greed of the seller). Some foreign manufacturers of bearings show good results, but if you want quality and cheapness, then pay attention to domestic ones - Vologda or Samara. The first ones turn out to be much better, the service life is high. But you need to buy parts only from trusted sellers - there are a lot of Chinese consumer goods on the spare parts market, the quality of which leaves much to be desired.
Preparing to remove the hub
To dismantle the rear hub on the VAZ-2108 or any other car with front-wheel drive, it is necessary to perform preparatory work:
- Place the machine on a level surface. An inspection pit is not needed - all work is performed without it.
- Install shoes under the front wheels, turn on the first speed or reverse - this will provide maximum fixation of the machine. You can not squeeze the handbrake - because you will remove the rear drum.
- Remove the protective cap to get to the hub nut.
- Now you need to straighten the shoulders on the nut using a drift and a hammer.
- Set the wrench to 30 and break the nut. Be sure to use a nozzle - a long pipe.
- Only then can the wheel bolts be loosened.
Now you need to raise the side of the machine being repaired and proceed to dismantle the hub.
How to remove the hub
In order to dismantle the rear hub, you need to perform the following manipulations:
- Remove the brake drum by unscrewing the two guide pins. If the drum does not lend itself, it is necessary to screw these guides into adjacent holes or gently, using a spacer, tap it from behind.
- Completely unscrew the hub nut, do not forget about the washer located under it.
- Using a three-legged puller, dismantle the hub. But you can use a simpler way - put the wheel on the back side and pull it sharply.
- If the inner race of the bearing remains on the axle shaft, it must be removed using a two-legged puller.
That's all, now you can put a new rear hub assembly. But if you only need to replace the bearing, you need to dismantle the old one and put a new one in its place.
Removal and installation of the bearing
In order to remove the bearing, you need:
- Using special pliers, remove the retaining rings.
- Remove old bearing. To do this, you can use any method - using a puller, a hammer and a mandrel.
- Thoroughly clean the internal surfaces - if there are notches, you need to get rid of them.
- Install the new bearing using a puller. Hitting with a hammer can damage the seal. It is advisable to warm up the rear hub, but not more than up to 50-60 degrees.
- Install the retaining rings - be sure to check that they fall into the grooves.
After all these manipulations, assemble the entire assembly. After tightening the hub nut, bend the flanges so that it does not unscrew.
