Sinotruk az9111340040 manual gap regulator original

Detailed product information

type

A manual brake adjustment lever: the gap between the brake block and the brake drum or brake disk must be regularly corrected manually in order to ensure the efficiency of braking. The design is relatively simple and is inexpensive, but requires regular maintenance and adjustment.

Automatic brake adjustment lever: it can automatically adjust the gap between the brake block and the brake drum or brake disk in accordance with the wear of the brake pad during braking, maintain the gap constant and make braking safe and reliable. This releases labor, reduces the number of repairs and increases the interval between the maintenance of vehicles.

The principle of operation: the automatic brake adjustment lever usually uses the movement of the air chamber pusher during braking. Through the inner gears, rails, worms, worm wheels and other gear ratio the linear movement of the pusher is converted into rotation of the cam shaft, thereby adjusting the gap between the brake blocks and the brake drum. The manual lever of the brake adjustment provides adjustment of the clearance by manual rotation of the adjusting nut or bolt to change the length of the pusher or angle of inclination of the camshaft.

Material and design: mainly consists of a case, a gearboard, a control lever, a locking pin, etc. The case is usually made of multiple cast iron or cast steel, which has high strength and wear resistance. Gears, rails, worms, worm wheels, etc. The transfer mechanism, as a rule, are made of high -quality steel and subjected to heat treatment and surface treatment to increase their hardness and wear resistance. Components such as control levers and stop pins are also made of appropriate metal materials to guarantee that they will not be deformed or damaged during prolonged use.

Installation

Preparation: Make sure that all the accessories in the kit, including the brake adjustment lever, the stoppack, holding the spring, adjusting gasket, cylindrical pin, cod, etc. Prepare the necessary tools, such as warden, screwdrivers, standards, dynamometric keys, etc. D. Clean the installation site and remove the oil Dust and rust from the surface of the camshaft, bracket, etc.

Stages of installation

Install on the camshaft: first insert a stopped pin into the hole on the side of the camshaft bracket, install a self -regulating lever on the distribution shaft and simultaneously adjust the control lever so that the flat part of the stopping pin enters the hole on the control lever. Use locking rings, adjusting washers and gaskets for fixing a self -regulating lever on the camshaft. Select the appropriate adjusting washers to provide an axial gap of a self-regulating lever within 0.5-1.0 mm. Please note that when installing a self -regulating lever, the direction of the arrow must correspond to the direction in which the air chamber pusher is advanced, and the handle of the self -regulating lever should be as far away from the air chamber bracket so as not to interfere with the subsequent installation of the air chamber.

Fix the stopped pin: Use the locking nut to fix the stopped pin on the crochet of the camshaft so that the control lever is installed and reliably pulled. The plastic sleeve should not fall and make sure that the central line of the control lever does not go beyond the gap in the lid to prevent interference during braking.

Connect the air chamber: make sure that the air chamber brake is released, and with the help of a wrench manually, turn the hexagonal head of the worm screw clockwise to combine the hole on the handle with the opening on the U-shaped fork of the air chamber. Apply a lubricant to a cylindrical pin, connect and fix the holes on the P-shaped fork and the handle of a self-regulating lever with a cylindrical pin, fix it with a slap.

Adjust the gap: with the help of a dynamometric key M12 (torque of a dynamometric key 12–18 N · m), manually adjust the hexagonal head of the worm clockwise until the brake’s friction lining and the brake drum will be barely touching each other (the gap is 0) and then turn the hexagonal head of the worm in The opposite direction is approximately 3/4 of the turn (270 °). Make sure that the pressure in the brake system of the vehicle meets the requirements (≥0.6 MPa), and press the brake pedal several times to the maximum stroke in place until the brake gap is adjusted to the normal range (0.6–1.1 mm ).

Common errors

The adjusting lever does not move

Reasons: gears and rails inside the adjusting lever are very worn out, which leads to the impossibility of normal transmission; engine or electromagnetic valve are faulty and cannot provide power; The sensor is faulty and cannot accurately determine the gap signal; The control line is open, is closed adherently or has poor contact, which affects the signal transmission and commands.

Exposure: The gap between the brake block and the brake drum cannot be adjusted automatically. As the brake pad is worn, the gap will gradually increase, as a result of which the brakes will become softer and the braking distance will increase.

Inaccurate adjustment

Reasons: the accuracy of the sensor decreases, and the measured value of the clearance becomes inaccurate; There are problems such as seizing and weakening of the internal gear mechanism, which leads to errors during adjustment; The adjusting lever is installed incorrectly, for example, the axial gap is too large or too small, which affects the adjustment effect.

Exposure: it can lead to the gap between the brake block and the brake drum will become too large or too small. If the gap is too large, the braking distance will increase; If the gap is too small, there will be friction between the brake block and the brake drum, which will increase the fuel consumption and brake pad wear, and can also lead to overheating of the brake drum, which will affect the efficiency of braking.

Abnormal sound

Reasons: wear and weakening of internal details. For example, poor engagement of worn gears and racks will lead to the appearance of friction or shock sounds; lack of oil or poor lubricant will lead to dry friction between the details and the abnormal noise; Loose installation will lead to a collision or friction of the adjusting lever about other parts during operation.

Influence: it produces an abnormal noise that affects the experience of driving and can also be an early sign of a malfunction. If you do not fix the problem on time, this can lead to more serious problems.

Sinotruk brakes adjustment levers are divided into two types: manual and automatic. Adjustment methods are as follows:

Manual brake lever adjustment method

Preparation: Parke the car on a flat, solid surface, turn on the manual brake, install anti -slip devices, such as triangular wooden bars, and make sure that the car is in a safe and motionless state. Use a jack and a safety stand to raise the part of the wheel that must be adjusted so that the wheel is at a certain distance from the ground for ease of work. Prepare the appropriate tools, such as wrenches, screwdrivers, calipers, etc.

Find the adjusting lever: it is usually located between the axis and the brake chamber, connecting the brake chamber pusher and the distribution shaft. In some models, it may be necessary to remove the wheel or related details in order to clearly see the adjusting lever.

The release of the locking device: for the adjusting lever with the design of the locking sleeve, the locking sleeve should be pressed into the housing. If there is a stop nut on the adjusting lever, weaken it with a wrench to facilitate the subsequent adjustment of the worm shaft.

Adjust the brake gap: Use a wrench or screwdriver to slowly rotate a worm shaft. As a rule, the rotation of the worm shaft to the right reduces the gap between the brake block and the brake drum, and the rotation to the left increases the gap. When adjusting, rotate the worm shaft, simultaneously measuring the gap between the brake block and the brake drum with a caliper or other measuring tools until it reaches the specified value, which usually is 0.6–1.1 mm.

Return blocking: after adjusting in the desired position, slowly turn the worm shaft to make sure that the locking sleeve has returned and blocked the worm shaft. If the design has a locking nut, tighten the locking nut to prevent a weakening of the adjustment lever.

Inspection and verification: lower the car, start the engine, let the air pressure reach a normal working range, then check the brakes to check the sensitivity of the brakes, whether the car has any abnormal states, such as deviations.

The method of adjusting the lever automatic brake adjustment

Daily inspection: with daily use and maintenance of the vehicle, the main thing is to check whether the automatic adjustment lever is working normally. Check if the adjusting lever is damaged or deformed, whether the connection is weakened, whether the air chamber pusher can be properly advanced and retracted, etc.

Functional test: start the car, bring the air pressure to the normal working range, perform several braking and check if the automatic adjustment lever can automatically adjust the brake gap after braking. About whether the adjusting lever is correctly working, you can judge by observing the change in the course of the air chamber pusher. Under normal conditions, as the brake pads wear, the stroke of the air chamber pusher will gradually increase, but the automatic adjusting lever will control it in a certain range.

Manual thin settings (special circumstances): if you find that the effect of adjusting the automatic adjustment lever is not perfect, for example, the brake gap is too large or too small, first check if other parts of the brake system are working, for example, the brakes are not worn out and not damaged pads, brake drums, air chambers, etc. If it is established that the problem is related to the automatic adjustment lever, You can try to perform manual accurate settings. After stopping the car and taking safety measures, find the adjusting screw or the adjustment mechanism on the automatic adjustment lever. As a rule, thin tuning can be performed by rotating the adjusting screw. However, the amplitude of the exact settings should be small, and after each adjustment, the brake test should be carried out to observe the adjustment effect until the brake gap returns to the normal range.