Tractor clutch failures may be caused by a variety of factors, including normal wear, improper use or maintenance, and component defects. The common failure modes are mainly as follows.

Slipping clutch: This is one of the most common problems with tractor clutches, where the clutch slips and does not engage properly. This can be caused by a worn clutch plate, a weak pressure plate, or oil or grease on the clutch plate.

Hard clutch pedal: A hard clutch pedal can be caused by a number of factors, including a worn or damaged release bearing, a misadjusted clutch pedal, or a damaged clutch fork.

Noisy clutch: A noisy clutch can be caused by a damaged or worn release bearing, a damaged clutch fork, or a worn pilot bearing.

Clutch chatter: Clutch chatter is a vibration or shaking that occurs when the clutch engages. This can be caused by a damaged or worn clutch plate, a damaged pressure plate, or worn out pilot bearings.

Sticking clutch: A sticking clutch can be caused by a variety of factors, including a misadjusted clutch pedal, a worn or damaged release bearing, or a damaged clutch fork.

Complete failure: A complete clutch failure can occur due to a number of reasons, including a broken or worn-out clutch plate, a damaged pressure plate, or a failed release bearing.

Regular maintenance and inspection of the tractor’s clutch system can help prevent these issues and ensure the clutch operates smoothly and efficiently.

To prevent tractor clutch failure, it’s important to follow the manufacturer’s recommended maintenance schedule and properly use and operate the tractor. Regular inspections and maintenance can help identify and address issues before they cause major failures.

An clutch is a type of mechanical component that is used in farming machinery to engage and disengage power transmission between the engine and the drivetrain of the vehicle. Agricultural clutches are designed to withstand heavy loads and high torque while providing reliable performance and durability in harsh agricultural environments.

A clutch kit, on the other hand, is a collection of parts that are used to replace or repair a damaged or worn-out clutch system. A typical clutch kit includes a clutch disc, pressure plate, and release bearing. The clutch disc is the part that connects the engine to the transmission and is responsible for transferring power between the two. The pressure plate applies pressure to the clutch disc, causing it to engage with the flywheel and transmit power to the transmission. The release bearing helps to disengage the clutch when the pedal is depressed, allowing for smooth gear changes.

The primary difference between a clutch and a clutch kit is that a clutch is a single component that is part of the vehicle’s drivetrain, while a clutch kit is a set of parts used to repair or replace a worn-out or damaged clutch. A clutch kit includes all the components necessary to replace the entire clutch system, while a clutch alone is just one part of that system. When a vehicle’s clutch begins to wear out or fail, a clutch kit is typically needed to replace the entire system and restore proper function.

Some common types of agricultural clutches include:

PTO clutches: Power Take-Off (PTO) clutches are used to transfer power from the engine to the drivetrain of the vehicle or a connected agricultural implement. PTO clutches are typically used in tractors and other agricultural machinery that require high torque and reliable power transmission.

Friction clutches: Friction clutches are used in agricultural machinery to engage and disengage power transmission between the engine and the drivetrain. Friction clutches typically use a system of plates and springs to engage and disengage the clutch.

Hydraulic clutches: Hydraulic clutches use fluid pressure to engage and disengage the clutch. Hydraulic clutches are commonly used in larger agricultural machinery, such as combines and harvesters, where they provide reliable and smooth power transmission.

Overall, clutches play a critical role in the reliable and efficient operation of farming machinery. They are designed to provide reliable power transmission, withstand heavy loads and high torque, and withstand the harsh environmental conditions commonly encountered in agricultural settings.

Tractor clutches play a crucial role in the smooth operation of tractors. They are responsible for connecting and disconnecting the engine from the transmission, allowing the tractor to change gears and control its speed and power. In this article, we will discuss the various types of tractor clutches and their applications.

Single Plate Clutch:

A single plate clutch is the most basic type of tractor clutch and is commonly found in small tractors. It consists of a single plate, a flywheel, and a pressure plate. When the clutch pedal is depressed, the pressure plate moves away from the flywheel, disconnecting the engine from the transmission.

Dual Plate Clutch:

A dual plate clutch is a more advanced type of tractor clutch and is commonly found in larger tractors. It consists of two plates, a flywheel, and a pressure plate. When the clutch pedal is depressed, the two plates separate, disconnecting the engine from the transmission. The dual plate clutch is designed for more demanding applications and provides greater power transmission compared to a single plate clutch.

Multi-Plate Clutch:

A multi-plate clutch is the most advanced type of tractor clutch and is commonly found in high-performance tractors. It consists of multiple plates, a flywheel, and a pressure plate. When the clutch pedal is depressed, the multiple plates separate, disconnecting the engine from the transmission. The multi-plate clutch is designed for the most demanding applications and provides the highest level of power transmission.

Dry Clutch:

A dry clutch is a type of tractor clutch that operates without the use of oil or lubricants. It consists of multiple plates, a flywheel, and a pressure plate. The dry clutch is designed for use in environments where oil or lubricants may be unavailable or inappropriate, such as in dusty or dirty conditions.

Wet Clutch:

A wet clutch is a type of tractor clutch that operates with the use of oil or lubricants. It consists of multiple plates, a flywheel, and a pressure plate. The wet clutch is designed for use in environments where oil or lubricants are readily available, such as in normal operating conditions.

In conclusion, tractor clutches play a crucial role in the smooth operation of tractors. There are several types of tractor clutches, including single plate, dual plate, multi-plate, dry, and wet clutches, each designed for specific applications and operating conditions. It is important to choose the right type of clutch for your tractor to ensure efficient and reliable performance.

The clutch is a major assembly in the tractor drive train. When the tractor starts, the high-speed rotating engine is smoothly connected with the stationary drive train through the friction between the active part and the driven part of the clutch to ensure the vehicle starts smoothly. In the long-term use of tractor clutches, the wear and tear of parts is unavoidable, and the replacement of parts has become the main work of clutch repair. The quality of assembly and adjustment technology after parts replacement determines the service life of the clutch after repair. Next, we will mainly take a certain brand of 25 type tractor clutch as an example to introduce the assembly and adjustment points of single-plate dry clutch.

Tractor clutch assembly

1. Assembly of release bearing assembly

The clutch release bearing is installed between the clutch and the transmission, and the release bearing seat is installed on the tubular extension of the first shaft bearing cover of the transmission. The shoulder of the release bearing always touches the release fork through the return spring and retreats to the final position. Keep a clearance of 2.5 mm from the release lever. There should be an interference of 0.03 mm when the separation bearing seat is installed. During installation, the inner cavity of the bearing and bearing seat should be filled with butter, and there is no place for oiling the bearing at ordinary times.

2. Assembly of clutch pressure plate assembly

The assembly of the clutch pressure plate assembly is to assemble the pressure plate, spring, clutch cover and separation mechanism together, and the spring must be compressed before proceeding. The spring can be pressurized by means of mechanical pressurization or hydraulic pressurization by self-made simple support, and also can be pressurized on a radial drilling machine.

(1) Put the pressure plate on the platform, and place a circular backing plate with a thickness of 10 mm and an outer diameter slightly smaller than the diameter of the pressure plate under the pressure plate, or place three small nuts of the same thickness on it.

(2) Place the swing block, release lever, release lever adjustment screw and pin on the inner side of the boss of the pressure plate in sequence, put the spring on the boss of the cross-shaped spring seat, and align the clutch cover with the transmission plate in place Put it on the spring, make the 4 adjusting screws pass through the corresponding holes on the clutch cover, and straighten the transmission plate so that the unriveted end is aligned with the screw hole on the pressure plate.

(3) Pressurize the spring on the clutch cover, and compress the spring by more than 10 mm. At this time, screw on the adjusting nuts one by one, and then fix the transmission disc bolts together with the transmission disc bolt seats in the screw holes of the pressure plate, and punch riveting Bolt seat.

3. Installation of driven plate assembly and pressure plate assembly on the flywheel

This installation is mainly about the centering of the driven disc assembly, so during installation, the clutch shaft (namely the first shaft) can be used as the mandrel, or an optical shaft can be used instead. Insert the center of the driven disc with the optical shaft, insert it into the flywheel bearing hole, then install the pressure plate assembly to the plane of the flywheel, and tighten it diagonally with six M8×20 bolts. With the optical shaft pulled out, the center of the driven disc is correctly fixed on the flywheel.

Post-installation adjustment of tractor clutch

1. Adjustment of separation lever

The heights of the working surfaces at the inner ends of each separation lever of the clutch must be consistent, that is, the working surfaces at the inner ends of each separation lever must be in the same plane parallel to the end surface of the flywheel. At the same time, the height of the working surface at the inner end of the release lever should also comply with the original manufacturer’s regulations, otherwise, during the process of clutch separation and engagement, the pressure plate will be skewed and the separation distance will be insufficient, resulting in incomplete separation and vibration when the vehicle starts . The structure of the clutch is different, and the adjustment of the release lever is also different.

There are currently 3 common types:

① Rotate the adjusting nut at the outer end of the separation lever;

② Rotate the adjustment nut in the middle (fulcrum) of the separation lever;

③Turn the adjusting screw at the inner end of the separation lever. When the adjusting nut is screwed in, the inner end of the separation lever is adjusted up, otherwise it is lowered. Adjusting screws are mainly used to make the end faces of each adjusting screw in the same plane. When the screws are screwed in, the end faces are adjusted down, otherwise they are adjusted up. When the adjustment meets the requirements, the adjustment screw (or nut) must be locked.

2. Adjustment of clutch pedal free travel

After the parts of the clutch control mechanism are assembled, adjust the spherical adjustment nut to change the length of the release rod, so that the release bearing can move back and forth on the release sleeve. The distance between the end face of the release bearing and the working face of the end of the release lever is reflected on the clutch pedal as the free travel, and the free travel of the pedal is required to be 30×40 mm. If it is too large, screw in the spherical adjusting nut; otherwise, screw out the spherical adjusting nut, and then tighten the lock nut.

(1) When adjusting the free travel, generally the distance between the release bearing and the release lever should be about 1.5 mm, and a pedal free travel of 30-40 mm can be obtained, which can be checked with a thickness gauge or a special plug.

(2) After the separation lever height (35.4±0.20) mm is adjusted, the height cannot be lowered arbitrarily to adapt to the free stroke of the pedal. journey.

(3) If you feel that the free travel of the pedal is too small during use, it is generally caused by the increase in the height of the separation lever end after the friction plate is worn thin. If the clutch is working normally at this time, you can adjust the free travel of the pedal through the spherical adjustment nut . If the clutch does not work normally and the free stroke decreases, the small flywheel housing can be removed, and the release lever adjustment nuts can be adjusted one by one to make the gap between the end face of the release lever and the release bearing the same, and the normal pedal free travel can be restored.

Note that when checking the free stroke of the pedal, first check whether the pedal returns to its position. If the pedal return spring is too soft, the pedal cannot be reliably returned, and the return spring should be replaced.

The above is all about the clutch assembly and adjustment methods, aiming to improve the repair quality of tractor clutches, and hope to help everyone better.

The so-called clutch is to use “off” and “on” to transmit the right amount of power. The agricultural machinery clutch consists of friction plates, spring plates (disc springs are used for tractors, and diaphragm springs are used for harvesters), a pressure plate and a power output shaft. It is transmitted to the gearbox to ensure that the agricultural machinery transmits the appropriate amount of driving force and torque to the driving wheels under different working conditions.

The clutch is a device that connects the agricultural machinery engine and the transmission, and the clutch pedal is the clutch control device. When the clutch pedal is stepped on or lifted, the engine and the transmission will be temporarily separated or smoothly combined to cut off or transmit power to realize changes in the agricultural machine’s starting, shifting, parking and other motion states. Slowly lift the clutch until it is fully lifted. If the engine stalls when the clutch is lifted, it proves that the clutch is not slipping. If the engine does not stall when the clutch is lifted, it may be a problem with the clutch.

Tractor clutch

The tractor clutch generally uses a double-acting clutch, that is, one road is responsible for walking, and the other road is responsible for power output. Due to structural reasons, the gap between the flange of the clutch pressure plate and the housing is relatively small, especially in the south of the Huaihe River in my country, where there is abundant rainfall and high air humidity, and the tractor is not used every day (sometimes it is not used for several months) , In this way, it is bound to be prone to rust, which will cause adhesion between the pressure plate bracket and the flange, resulting in incomplete separation of the clutch.

Suggestion: before using the tractor parked for a long time, the tractor operator should first open the clutch inspection port, use a flat screwdriver to turn the clutch assembly, and spray a little rust remover on the three flanges of the clutch pressure plate, and then step on the A few clutch pedals make it move back and forth, and then the tractor can be used normally for various tasks.

Combine Harvester Clutch

Because the working environment of the combine harvester is very bad, there is a lot of dust in the air, and the clutch is an open structure. When the harvester is working, the dust in the air is brought into the clutch chamber from the gap between the clutch pulley and the clutch housing support, and is captured. The rotating clutch is driven by the centrifugal force to the inner space of the pressure plate, gradually forming the phenomenon of clutch slippage (the combine harvester will appear weak when walking). In addition, the clutch drive belt of the combine harvester should not be too tight and should not be started at high speed, otherwise, serious faults such as bending of the clutch shaft will easily occur.

Suggestion:

1. The designer of the Technology Center Research Institute should design grooves on the inner wall of the clutch housing (corresponding to the clutch pulley), and stick felt strips of uniform thickness to prevent large dust particles from entering the clutch chamber. Note: rubber seals cannot be used. ring, because the clutch pulley is at the end of a shaft, there will be a large jump).

2. The operator of the combine harvester does not regularly maintain the clutch.

Operation and use of the clutch

First of all, the pedal should be pressed firmly with the sole of the left foot, and the clutch pedal should be stepped down or lifted with the flexion and extension of the knee joint and hip joint. Do not use the toe, sole or heel to step on the clutch pedal to prevent insufficient pedaling force or slipping off. pedal. The action of depressing the clutch pedal should be fast, and all the way to the end, so that the clutch can be completely disengaged, when the clutch pedal is lifted. It should be determined according to the operating situation. Generally, when the working gear is changed to neutral, the clutch pedal can be lifted quickly. When the agricultural machine starts or shifts, the free travel before the off-table device is not engaged can be slightly faster. When the clutch starts to engage Then stop for a while, then slowly lift the clutch pedal (and gradually increase the throttle), and after the clutch is fully engaged, you should quickly remove your foot from the pedal and place it under the pedal. When the clutch is not used during agricultural machinery work , do not put your foot on the clutch pedal! ! ! In order to avoid the half-linkage phenomenon of the clutch, which will affect the transmission torque and increase the wear of the parts.

1. Starting and shifting of agricultural machinery:

When starting, depress the clutch to completely disengage; when lifting the clutch pedal, operate according to the essentials of “one fast, two slow, three linkage”. That is, the process of pedal lifting is divided into three stages, starting to lift quickly; when the clutch appears half-linked (the engine sound changes at this time), the speed of pedal lifting is slightly slower; from half-linked to fully combined, the pedal is slowly lifted. Lift slowly. While the clutch pedal is lifted, gradually depress the accelerator pedal according to the engine resistance to make the agricultural machine start smoothly. The operation of the throttle should be smooth and appropriate. The clutch pedal operation method of one fast, two slow and three fast should be followed, and strive to engage smoothly.

2. Reduce clutch usage:

If the temperature is too high, the friction lining will be worn or cracked rapidly. Therefore, minimize the number of clutch disengagement and engagement, and the number of semi-linkages.

3. During emergency braking or approaching a stop:

During the driving of agricultural machinery, do not depress the clutch pedal under any other circumstances except that the clutch pedal must be depressed for braking at low speed (above 10km/h). Depress the clutch and let the agricultural machine coast to slow down to reduce the impact on the engine and drive train.

4. For your safety:

It is strictly forbidden to go uphill and disengage gear, go downhill and step on the clutch to slide in neutral gear, put in gear and lift the clutch pedal to start the engine; it is strictly forbidden to use the method of suddenly accelerating the accelerator and suddenly lifting the clutch pedal to drive the wheels to slip on soft roads, muddy roads, and ice and snow roads. road section.

5. Don’t step on the clutch if you have nothing to do:

When the clutch on the agricultural machinery is working normally, it is in a tightly engaged state, and the clutch should not slip. The separation of the clutch is controlled by stepping on the clutch pedal. When driving, do not step on the clutch pedal at any other time, except that the clutch pedal needs to be stepped on when the agricultural machinery starts, shifts gears and brakes at low speed.

Step on the clutch at work or put your foot on the clutch pedal for a long time, so that the clutch is often in the state of engagement, separation or half-slip, which accelerates the wear of the clutch friction plate and pressure plate, and makes the power of the engine unable to be fully transmitted. To drive the wheels, resulting in traffic costs oil, waste cars, increase traffic costs.
If you put your foot on the clutch pedal for a long time during work, it is easy to cause clutch slippage, clutch disc ablation, etc., and in severe cases, it may even cause ablation and strain on the clutch pressure plate and flywheel end surface, and annealing of the clutch compression spring.

6. Correct operation when shifting gears:

The gearboxes of agricultural machinery generally adopt the shifting structure of meshing sleeves. In order to make the shifting smooth and reduce the wear of the shifting mechanism and clutch of the transmission, the “two-leg clutch shifting method” is advocated. That is, when upshifting, press the clutch pedal while shifting the shift lever to a higher gear; when downshifting, step down the clutch pedal while shifting the shift lever to neutral, lift the clutch pedal and accelerate appropriately according to the vehicle speed. Kick off the gas, then depress the clutch pedal again while shifting the gear lever to a low gear.

7. The correct use of the clutch when braking:

During the driving of agricultural machinery, do not depress the clutch pedal under any other circumstances except that the clutch pedal must be depressed for braking at low speed (above 10km/h). Because when the agricultural machinery is braking at medium and high speeds, depressing the clutch pedal will not help at all to improve the braking ability of the agricultural machinery, and will also bring danger to driving safety.

When braking and parking at low speeds, the purpose of depressing the clutch pedal is only to prevent the engine from stalling. At this time, the correct control method is to depress the brake pedal first, and then depress the clutch pedal to make the agricultural machine stop smoothly.

The use of agricultural machinery clutches is introduced here. In order to enable everyone to correctly use combine harvesters, tractors, etc. to drive agricultural machinery, operate and maintain clutches correctly, so that agricultural machinery can be used for a longer period of time and cost less maintenance costs, integrated for decades. The technical guidance listed in the experience of using, operating and maintaining agricultural machinery, I hope it can be helpful to everyone.