Rear bridge reducer

Rear axle reducer is a set of mechanisms designed to transmit the torque of the cardan shaft on the axis of the rear wheels. To understand, it takes a gearbox for him, you need to know how the engine energy is transmitted on the car's wheels.

The rotation of the engine crankshaft during operation is transmitted to the vehicle clutch disc, and then to the primary shaft of the gearbox. The driver chosen by the driver transmits the rotation to the secondary shaft of the gearbox, and then on the casset of the cardan shaft, which stretches under the car to the rear axle gearbox. The rear axle gear distributes the torque from the cardan shaft on the semi-axis, which, in turn, drive the wheel. Thus, the rear axle gear is designed to convert the torque of the cardan shaft into two semi-axles of the rear wheels of the car.

Diagnosis and causes of faults

The fact that the gearbox is in a faulty state, indicates the appearance of characteristic noise (hum) when the car is moving. To accurately define the malfunction of the gearbox, there is the following experiment.

You need to dispersed the car up to 25 kilometers per hour and smoothly dial the speed, starting with this mark. If suspicious guls appear, be sure to fix the speed on which you hear them.

After gaining the desired speed, slowly release the gas pedal and carry out the engine braking. Listen to the flooded noise again and pay attention to the speeds on which they appear or disappear.

Certain noises should appear and disappear at the same speed. If this happens, then the rear axle reducer is in a faulty state. However, to be 100 percent sure, be sure to place the car on the parking brake, turn on the neutral transmission and try to gain momentum if the noise appears again, then it's not in the rear axle gearbox, and if there is no noise, it means you can be sure that it is Rear axle gearbox.

The cause of faults is most often hidden in the use of low-quality oil, loss of its viscosity, as well as its complete absence. In addition, the gearbox may fail due to the outcome of the oil, bearings and special gears. Sometimes, the cause of the rear axle gearbox is a fracture of the semi-axis.

How to repair reducer on VAZ 2107

If you decide to repair work, you need to dismantle the reducer from the car. For this, first of all, drain the oil from the gearbox: unscrew the drain plug at the bottom of the gearbox and substitute an empty container. At the end, the oil will need to replace the new one.

Now you need to unscrew all the screws that fasten the gear shank to the flange of the cardan shaft. Then lift the back of the car and remove both wheels. Remove the brake drums and unscrew the bolts that fasten the semi-axes. Pull the semi-axes, thus fully released the gearbox. There will remain 4 bolts of the reduction of the gearbox, which also need to unscrew. After that, you can safely remove the gearbox.

To repair the gearbox, it needs to be disassembled. To do this, unscrew all the nuts that fasten the shank, pull out the flange, gear with special adjusting rings, rubber gland and the inner ring of the bearing. Then squeeze the outer rings of bearings and then disassemble the differential and drive gear. As soon as the reducer will completely discern, throw the spacer shutter.

As you understand, the spacer must be changed in any case. This part is one-time and reuse is not subject to. Also, if unsatisfactory condition, it is recommended to change the bearings and the main pair. The pair highlights the gear ratio, and the more, the higher the power of the gearbox. A small gear ratio increases the speed characteristics of the gearbox. What to choose is to solve you. Selection of a gear ratio, just and is adjustable gearbox.

After selecting a gear ratio, change all the glands and cuffs and assemble in the reverse order.

If the reducer is in too unsatisfactory condition, it is recommended to completely replace it with a new one. This is a good savings on the work of car service specialists.

Installing a new or subject to repair of the gearbox is performed in the reverse order. First, install the gearbox itself, tighten the mounting bolts and insert the semipes and secure them. After that, install the cardan to the shank and fill the new oil into the gearbox.

Video - Adjusting the rear axle gearbox

This repairs reducer completed. However, this technological process is very difficult and highly recommended to use the services of car service staff, which will fulfill this work professionally, without harm to the gearbox.