The device of any car has a clutch. This system produces a smooth gear on and off, transmitting torque from the flywheel to the wheels. This is controlled by the clutch master and slave cylinders. UAZ "Loaf" is also equipped with it. In today's article we will consider what constitutes a work item, how to replace and adjust it.
Design
Unlike front-wheel drive foreign cars, on all-wheel drive UAZ Patriot cars, the clutch slave cylinder (adjusting it at the end of the article) is hydraulic and is controlled by fluid pressure rather than by a cable. The design of this element includes several components. It:
- Body. It is made of plastic or metal.
- Piston (working rod).
- A valve that bleeds air during bleeding of the clutch system (adjustment).
- Snap ring
- O-rings Made of durable rubber.
- Return spring.
- Pusher. It has an effect on the previous element.
Principle of operation
How does the clutch slave cylinder work? UAZ "Patriot" controls it using hydraulics.
When the clutch pedal is depressed, the piston exerts pressure from the metal rod. Further, the fluid, moving through the pipelines, drives the clutch slave cylinder. UAZ "Hunter" has aluminum lines, which at the junction are replaced by rubber. Under high pressure, the stem releases the
release bearing. This stops the transmission of torque from the engine to the gearbox. When releasing the pedal, the clutch slave cylinder (UAZ-469 is no exception) connects the
clutch discs again
. Torque transmission resumes. It is worth noting the convenience of using such a system. Compared to a cable drive, such a pedal is much easier to press. The disc connects softly and smoothly. Pad wear is minimal.
Symptoms
How to understand that a car needs a clutch slave cylinder replacement? UAZ - the car is very reliable, but this part can also fail. There are several ways to identify a breakdown. Firstly, this is a sharp decrease in the liquid level in the tank. If a leak is observed, the cylinder boot may have broken through. Damage may also affect rubber or aluminum tubes. Check their integrity. Secondly, the pedal travel becomes softer. There are "clutch failures." This indicates the presence of air in the system.
He can get only with mechanical damage to the boot or the case itself. In this case, it is necessary to repair the part or completely change the clutch slave cylinder. UAZ with such a malfunction also changes the pedal stroke. The clutch is released and squeezed lower and lower, and the gears shift very tightly. Most often in this case, a return spring malfunction occurs. It is enough to make repairs by buying a repair kit. It includes elements such as cuffs, stem, spring, stopper and o-ring.
DIY replacement
First, drain the remaining fluid in the system. This can be done with a syringe. This operation is necessary in order to flush the hydraulic drive system from dirt. On some models, access may be closed by the expansion tank of the cooling system. For convenience, remove the fastening nuts of the container and remove the hose. It should be unscrewed with a key of 10. Next, dismantle the metal tube, which comes from the clutch master cylinder. It can be copper or aluminum. After that we take out the main cylinder, having previously unscrewed two fixing nuts with a key on 13. Using the 17 head, it is necessary to remove the hose that comes from the working cylinder. Next, we again need the key at 13.
With it, we unscrew the two bolts that secure the clutch slave cylinder. UAZ is in neutral gear. The slave cylinder on this vehicle is mounted on the gearbox housing. In order not to damage other elements, carefully disconnect the pusher from the plug. If the hoses are removed “by weight” (that is, on the removed element), the cylinder can be fixed using an
adjustable wrench on one side, and on the other, unscrew the tube with a cape. But be careful, as rubber may crack under mechanical stress.
DIY repair
So, the part is removed and ready for disassembly. First, unscrew the valve to bleed air and remove the retaining ring. After disassembling the parts, inspect the condition of all elements - springs, pistons, pushers and sealing gums. They should not have traces of mechanical damage. Next, we wash the inside of the element. Doing this with aggressive fluids like gasoline and diesel fuel is not necessary. Fill the medical syringe with hydraulic fluid and, under pressure, clean the dirt inside it.
If the damage is only local, we need a repair kit for restoration. It is worth noting that even with one damaged part, all elements as a whole change, be it an elastic band, anther or spring. This will increase the working life of the working cylinder.
When can not be restored?
In some cases, repairs will not work. Replacement of the working cylinder is carried out in case of damage to the housing (crack), or a large output inside it. The latter may occur due to a faulty or defective stock. With any of these malfunctions, the UAZ clutch slave cylinder changes entirely to a new one. The cost of an element is about five hundred to six hundred rubles. A little more expensive is the clutch master cylinder - 750 rubles. Repair kit can be purchased at a price of 150 to 200 rubles. The amount is not impressive, so with a limited time it is better to immediately replace the item with a new one in the collection. After the clutch slave cylinder is installed, the UAZ needs to be pumped. So we will eliminate all available air jams in the highways and adjust the normal pedal travel.
Leveling
After successful installation and assembly of the element, it is necessary to fill in a new hydraulic fluid. Used the same as for the brake system. After that, we unscrew the air valve of the working cylinder several turns and press the clutch pedal 5-7 times. In order not to run into the salon several times, call an assistant who will pump the system. Be careful - when you press the pedal, hydraulic fluid will flow from the valve. Therefore, pre-prepare the container. It can be a regular bottle of mineral water.
And to avoid smudges, use a rubber hose. Slide one end onto the air valve and lower the other into the neck of the bottle. At first, the liquid will spray - this is normal. Subsequent pressings will decrease the amount of air. Step on the pedal until a clean, bubble-free fluid flows from the hose. This will mean that there is no more air left in the system. Screw the valve back on and put on the protective rubber cap. Due to its location, water, dirt and dust constantly get 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. Keep the level at maximum during operation. At this stage, the pumping of the clutch slave cylinder UAZ is completed. The pedal will acquire its factory operation.
UAZ clutch slave cylinder adjustment
To avoid incomplete switching on or off the gear, it is necessary to adjust the pitch of the cylinder rod. To do this, use the WD-40 to clean the adjusting nuts. On one side of the element weaken the lock nut, and on the other, we fix the bolt with the second key.
Using the 8-horn, we clamp the end of the pusher. When the rod locks, unscrew the lock nut a couple of turns counterclockwise. Next, set the free screw pitch. Ideally, the stem should move fully. After that, we fix the locknut with a key and thus maintain the full stroke of the cylinder. This completes the adjustment process. It is worth noting that this operation is not necessary on new elements. Well, if a repair kit was used, it is advisable to check the stem free play. Now various slippage of the slave and master disk will be excluded. For any action with the clutch elements, do not forget to pump it.
Prevention
For the clutch system to last as long as possible, monitor the level of fluid remaining in the system.
After 2 years or 50 thousand kilometers, it must be drained and a new one filled. After this procedure, be sure to pump the system. Remember that hydraulic fluid absorbs moisture well. When the replacement is delayed, rust forms in the system, which will reduce the service life of the clutch master and slave cylinders. Watch for the tightness of the tubes, especially in places where metal and rubber join.
It happens that the material is cracking or rubbing against the wheel (if we are talking about the front). This is very dangerous, since during depressurization of the system you will be left without a clutch and you can only reach your destination by towing or crushing your gearbox.
Conclusion
So, we found out how the clutch slave cylinder of the UAZ is arranged, how to replace it and pump the system. As you can see, with a minimum set of tools, this operation can be performed on your own. The repair budget will rarely reach 1 thousand rubles.