The working clutch cylinder UAZ: adjustment and replacement

The device of any car provides traction. This system produces a smooth switching on and off of gears, producing torque transmission from the flywheel to the wheels. The master and clutch master cylinder controls this . UAZ "Loaf" is also equipped with them. In today's article we will consider what the working element is, how to make its replacement and adjustment.

Design

In contrast to front-wheel drive cars, on all-wheel drive vehicles UAZ Patriot working clutch cylinder ( its adjustment - at the end of the article) is hydraulic and controlled by the pressure of the liquid, and not by a cable. The design of this element includes several components. It:

• Housing. It is made of plastic or metal.
• Piston (working rod).
• A valve that releases air when bleeding the clutch system (adjustment).
• Locking ring.
• Sealing rings. Made of strong rubber.
• Return spring.
• Pusher. It affects the previous element.

Principle of operation

How does the clutch slave cylinder work? UAZ "Patriot" manages it with the help of hydraulics. When you press the clutch pedal on the piston is the pressure from the metal rod. Further, the liquid, moving through the pipelines, drives the clutch slave cylinder. UAZ "Hunter" has aluminum mains, which are replaced at the connection points by rubber. Under the influence of high pressure, the rod releases the release bearing. Thus, the transfer of torque from the engine to the transmission is stopped. When the pedal is released, the clutch slave cylinder (UAZ-469 is no exception) reconnects the clutch discs. The torque transmission resumes. It is worth noting the convenience of using such a system. In comparison with the cable-driven drive, this pedal is pressed much easier. The disc connects gently and smoothly. Depreciation of the lining is minimal.

Symptoms of malfunctions

How to understand that the car requires the replacement of the clutch slave cylinder? UAZ - the car is very reliable, but this part can fail. Identify the breakdown by several features. First, it is a sharp decrease in the level of liquid in the tank. If there is a leak, the cylinder boot may have broken through. Also, damages can touch rubber or aluminum tubes. Check their integrity. Secondly, the pedal stroke becomes softer. There are "clutch failures". This indicates the presence of air in the system. It can only enter when the anther or the body itself is mechanically damaged. In this case, it is necessary to repair the part or change the clutch slave cylinder entirely. With this fault, the UAZ also changes the course of the pedal. The clutch is released and squeezed all the way down, and the gears switch very tightly. Most often in this case, there is a malfunction of the return spring. It is enough to make repairs by buying a repair kit. It includes elements such as a cuff, stem, spring, stopper and o-ring.

Self-replacement

First you need to drain the remaining liquid in the system. This can be done with a syringe. This operation is necessary in order to rinse the mud from the hydraulic drive system. On some models, access can be closed by the expansion tank of the cooling system. For convenience, remove the fixing nuts of the tank and remove the hose. To unscrew it is necessary a key on 10. Further we disassemble a metal tube which goes from the main cylinder of coupling. It can be copper or aluminum. After that, take out the master cylinder, having previously unscrewed the two fixing nuts with a wrench. With the help of a head on 17 it is necessary to remove the hose that goes from the working cylinder. Next, we again need a key to 13. Using it, we unscrew the two bolts that secure the clutch slave cylinder. At that, UAZ is on neutral transfer. The working cylinder on this car is attached to the transmission housing. In order not to damage other elements, carefully disconnect the push rod from the fork. If the hoses are removed "on the weight" (i.e., on the removed element), the cylinder can be secured with a wrench on one side, and on the other hand - with a cape to unscrew the tube. But be careful, as with mechanical action rubber can crack.

Self-repair

So, the part is removed and ready for disassembly. First, unscrew the air vent valve and remove the circlip. After disassembling the parts, we inspect the condition of all elements - spring, piston, pusher and sealing rubber. They should not have any signs of mechanical damage. Then we wash the inside of the element. Do this with aggressive liquids like gasoline and diesel fuel is not necessary. Fill the medical syringe with hydraulic fluid and clean the dirt inside it with pressure. If the damage is only local, we need a repair kit to restore it. It should be noted that even with one damaged part all the elements change, be it an elastic band, anther or spring. This will increase the service life of the working cylinder.

When can not I restore?

In some cases, repairs will not work. Replacement of the working cylinder is made in case of damage to the casing (the presence of a crack), or a large production inside it. The latter may occur due to a defective or defective rod. For any of these faults, the UAZ clutch slave cylinder changes entirely to a new one. The cost of the element is about five hundred to six hundred rubles. Slightly more expensive is the master cylinder of the clutch - 750 rubles. The repair kit can be purchased at a price of 150 to 200 rubles. The amount is not impressive, so for a limited time it is better to replace the element with a new one at once. After the clutch slave cylinder is installed, UAZ needs to be "pumped". So we eliminate all the existing air jams in the trunks and adjust the normal course of the pedal.

Prorolling

After the successful installation and assembly of the element, it is necessary to fill a new hydraulic fluid. Used the same as for the braking system. After that, unscrew the air valve of the working cylinder by several turns and press 5-7 times on the clutch pedal. To several times not to run into the salon, call an assistant who will pump the system. Be careful - when you press the pedal from the valve will drain hydraulic fluid. Therefore, pre-prepare the container. It can be an ordinary bottle of mineral water. And that there was no staining, use a rubber hose. Put one end on the air valve, and the other end into the neck of the bottle. Initially, the liquid will spray - this is normal. At subsequent pressures, the amount of air will decrease. Press the pedal until a clean, bubble-free liquid comes from the hose. This will mean that there is no more air in the system. Tighten the valve back and fit the protective rubber cap. Due to its location, water, dirt and dust are constantly falling on the part. To protect the valve from clogging, this rubber cap is provided. Check the level under the hood. If necessary, top up to the maximum mark. During operation, keep the level at maximum. At this stage the pumping of the UAZ clutch slave cylinder is completed. The pedal will acquire its factory stroke.

Adjustment of the UAZ clutch slave cylinder

To avoid incomplete switching on or off of the transmission, it is necessary to adjust the stroke of the cylinder rod. For this, we clean the adjusting nuts with the WD-40. On one side of the element we loosen the locknut, and on the other - we fix the bolt with the second key. Using the horn on 8, press the end of the pusher. When the rod is locked, unscrew the locknut for a couple of turns counter-clockwise. Next, set the step of the free screw. Ideally, the rod should move completely. Then fix the lock nut with a wrench and thus keep the full stroke of the cylinder. This completes the adjustment process. It is worth noting that it is not necessary to perform this operation on new elements. Well, if a repair kit was used, it is advisable to check the free stroke of the rod. Now various slips of the slave and the master disc will be excluded. At any action with elements of coupling do not forget to pump it.

Prevention

To maintain the clutch system as long as possible, monitor the level of fluid remaining in the system. After 2 years or 50 thousand kilometers of run it must be drained and filled with a new one. After this procedure, be sure to pump the system. Remember that the hydraulic fluid absorbs moisture well. When the replacement is delayed, rust will form in the system, which will shorten the life of the main and working clutch cylinder. Watch for the tightness of the tubes, especially in places where the metal is connected with rubber. It happens that the material is cracked or rubbed against the wheel (if it comes to the front). This is very dangerous, because when you depressurize the system you will remain without clutch and you can reach the destination only by towing or grabbing your gearbox.

Conclusion

So, we found out how the UAZ clutch slave cylinder works, how to replace it and pump the system. As you can see, with a minimal set of tools, this operation can be performed on its own. The repair budget will rarely reach 1 thousand rubles.