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 clutch assembly consists of three sets of tractor clutch disc, clutch pressure plate and release bearing. The tractor clutch disc is a composite material with friction as the main function and structural performance requirements. Friction materials are mainly used to manufacture brake friction plates and tractor clutch discs.

The inner end of each release lever of the tractor clutch and the release bearing must be in contact together, so that the vehicle can start smoothly. If the height of the inner end of the disengaged lever is different, the tractor clutch will vibrate when it is tightly connected.

Therefore, during assembly and maintenance, it is necessary to check the contact between the inner ends of each separated lever and the release bearing. It is required that the inner ends of each separated lever be located on the same plane, and the deviation should comply with the original regulations, generally not exceeding 0.25 mm. If it does not meet the requirements, it should be adjusted by adjusting the position of the adjustment screw at the inner end of the separated lever or the toe.

For the pulsation damper spring clutch, if the pulsation damper spring is separated, it means that the load on the pulsation damper spring is uneven or reduced due to damage, corrosion, cracking, etc., it must be upgraded. The spring separation means of the pulse damper must be evenly arranged on the center of the circle, and the deviation should not exceed 0.5mm.

At the same time, the heights of the separated springs should be on the same level, and the deviation should not exceed 0.5mm. If the springs are separated, the fingers are uneven, which will make the vehicle start unstable and trembling, and the tractor clutch cannot be completely separated. .

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.

13-Inch-16-Spline-with-Spring

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.

40-Type-18-Spline

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.

In current agricultural production, the tractor is an irreplaceable power machine. The tractor clutch is installed between the engine and the gearbox. It works smoothly when in gear; limits the maximum torque that the drive train can withstand, and prevents the drive train from being overloaded.

Since the clutch is often used in the use of the tractor, how to operate the clutch correctly is particularly important. The tractor clutch manufacturer took the Kubota tractor clutch as an example to introduce the correct operation and use of the tractor clutch as follows:

1. When using the clutch to disengage, it must be quickly and thoroughly, and the pedal should be pressed to the bottom at one time, so as not to cause drag and linkage;

MF series

When the tractor is started, the clutch pedal is lifted violently, which will cause the clutch to be unsteady and produce an impact load, which will cause the friction lining to warp or even break due to the huge impact force; at the same time, it will also damage other working parts of the transmission system; If it is too slow, it will cause shock, vibration and even flameout.

When you start, you must master the essentials of “fast, pause, and slow”. The first is fast. After the tractor is put into low gear, quickly lift the clutch pedal to find the contact point. At this time, the tractor shakes and has a tendency to drive; and then “pause”, that is, after finding the contact point, the clutch should stop at this position. , to make the clutch friction plate engage smoothly; the last is “slow”, at this time, step on the accelerator gradually, and slowly lift the clutch pedal to ensure the tractor starts smoothly. The tractor should not be started with a load in a high gear. It should be in a low gear first, and then shifted into a high gear after starting.

13-Inch-(2)

The separation should be quick and thorough. If the separation is in a “semi-linkage” state, a large amount of heat will be generated between the friction plates, and the friction coefficient will decrease. Excessive heat will cause the friction plates to burn or peel off. If the separation is not complete, use the “semi-linkage” for 1 hour continuously or use it for 1 minute each time, and use it for 4 hours in total, the clutch friction plate, separation pressure claw or other parts will be scrapped.

2. The operator should not put his foot on the clutch pedal while the tractor is running, so as not to cause the release bearing to be in a rotating state and shorten its service life; use the semi-linkage as much as possible to control the clutch, because the semi-linkage can make the gap between the friction plate and the pressure plate The high temperature will cause the pressure plate spring to lose its proper elasticity when heated, and in severe cases, the friction plate will be ablated, causing the clutch to slip.

K series

3. When the car is trapped or over obstacles, do not use the method of violently lifting the clutch to impact, so as not to damage the transmission parts; try to start with the first gear, and do not use the clutch to change the speed of the car; try not to use the method of half separation to reduce the speed of the car; Always check whether there is oil on the active plate, pressure plate, and driven friction plate. If there is oil, clean it with gasoline; if the friction plate wears too much, replace the friction plate; if the spring is not strong enough, replace it with a new spring; The gap between the lever and the release bearing is not suitable, the gap should be adjusted.

The above is timely about the correct use method of Kubota tractor clutch. If you have any questions during use, you can contact the manufacturer at any time.

With the increase in the number of times of use or improper use of the tractor clutch, the friction plates and transmission mechanism of the clutch will inevitably wear out, causing the clutch to slip, incomplete separation, and shaking during work, affecting the normal use of the vehicle. Therefore, timely inspection and adjustment of the clutch in use is essential. The following introduces the inspection and adjustment techniques of clutches used on several common models.

Adjustment of the clutch of Benno 350, 480 tractor

Benno 350, 480 tractor clutches are single acting clutches. In order to ensure reliable transmission of power, the active part must be pressed against the driven part so that the clutch does not slip. There should be a gap of 2.5 ±0.5 mm between the release bearing and the end faces of the three release levers. When the clutch is released, a little force is applied to the clutch pedal to eliminate this gap. The pedal stroke is called “free stroke”, which is converted to the separation The rocker arm is about 5 to 8 mm.

From this point on, continue to exert force on the clutch pedal, so that the separation rocker arm continues to swing forward until it hits the limit screw. 35mm. In the process of use, due to the wear of the driven plate, the pressure plate moves forward, and the free stroke is gradually reduced accordingly. Therefore, it must be checked and adjusted regularly. The methods are as follows:

(1) Adjustment of free stroke. It can be solved by turning the adjusting fork to shorten or lengthen the push rod, and the adjustment of the working stroke can be solved by screwing in or out the limit screw. After the adjustment is completed, the nuts on the push rod and limit screw should be tightened.

(2) Adjustment when the clutch is not completely disengaged. First adjust the working stroke to the maximum value, if it is invalid, open the peep window on the right side of the rear axle housing, first loosen the lock nut and tighten the three adjusting nuts at the same time, the rotation angles must be equal, and the operation of the separation clutch should be used. The test confirms whether the adjustment is effective. After the adjustment is completed, tighten the lock nut.

(3) Adjustment when the clutch slips. When the clutch slips, first check whether the free stroke is within the specified range. If the free stroke disappears or the 3 release levers have been compressed, the free stroke must be adjusted to the specified range. If the free stroke is within the specified range and the clutch slips, the three adjusting nuts must be adjusted, and the same rotation angle must be rotated outwards. After adjustment, tighten the nut again.

40-Type-18-Spline

Adjustment of clutch of SH-500 tractor

The SH-500/504/650/654 tractor clutch is a single-plate, dry-type, double-acting clutch. The adjustment method is as follows:

(1) Adjustment of the free stroke of the clutch pedal. Remove the pin on the control rod, rotate the connecting fork, change the length of the rod, and adjust the free stroke of the clutch pedal to 25-35 mm.

(2) Adjustment of the main clutch release stroke. Loosen the locking nut on the main pressure plate, and turn the adjusting screw, so that the gap between the adjusting screw on the main pressure plate and the three lugs of the auxiliary friction plate pressure plate is 1. 8 mm.

(3) Another adjustment method for the separation stroke of the main clutch. Open the observation hole cover on the left side of the transmission, turn the clutch, align the adjusting screw on the main pressure plate and the three lugs of the auxiliary friction plate pressure plate with the observation hole, and then adjust one by one.

(4) Adjustment of the distance between the head of the three separation levers and the end face of the rear cylinder block of the diesel engine. Separate the diesel engine from the transmission, loosen the nut, and turn the adjusting screw on the release lever with a screwdriver, so that the distance between the heads of the three release levers and the end face of the rear cylinder block of the diesel engine is (158.5 ± 0.15) mm.

Adjustment of Dongfeng-504 Tractor Clutch

Dongfeng-504 tractor is a double-acting clutch, the adjustment method is as follows:

(1) Adjustment of the position of the clutch release lever. This adjustment is made when the clutch is installed. The adjustment method is: Loosen the lock nut on the release lever, and rotate the adjusting screw with an Allen wrench, so that the distance between the end face of the ball head of the release lever and the outer end face of the flywheel is 89-90 mm, and the adjustment values ​​of the three release levers should be the same. Must not exceed 0.2 mm. After meeting the requirements, tighten the adjusting screw.

(2) Inspection and adjustment of the main clutch release stroke. During inspection, remove the clutch inspection port cover and measure with a feeler gauge. The clearance between the end faces of the three limit nuts and the main clutch pressure plate should be within the range of 2 to 2.05 mm. If it does not meet the requirements, it should be adjusted. The method is: loosen the lock nut, turn the adjustment nut, and tighten the lock nut after meeting the requirements.

(3) Adjustment of the free stroke of the clutch pedal. The adjustment method of the free stroke of the clutch pedal: Loosen the lock nut on the clutch lever, turn the lever, and change its length, so that the free stroke of the pedal is between 22 and 24 mm (equivalent to a clearance between the release lever and the release bearing of 2 mm).

JDT724, JDT7501 tractor

JDT724, JDT7501 tractors are normally engaged, single-plate, dry-type, double-acting clutches. The adjustment methods are as follows:

(1) Adjustment of the free stroke of the clutch pedal. Loosen the lock nut on the clutch lever, remove the connecting pin, and unscrew (or screw in) the adjusting fork to adjust the free stroke of the pedal to 20-30 mm. Finally reassemble the parts and tighten the lock nut. For models JDT7501, JDT754l and JDT8241, the free stroke of the pedal should be 30-50 mm.

(2) Adjustment of the clearance between the release lever and the end face of the release bearing. Remove the cotter pin on the adjusting nut from the front inspection hole on the left side of the clutch housing, and unscrew (or screw in) the adjusting nut so that the clearance between the end of the release lever and the end face of the release sleeve thrust bearing reaches (2.5 ± 0.5) mm, then insert a new cotter pin and lock it.

(3) Adjustment of the main clutch release stroke. When adjusting, screw the three support bolts until they stand against the end faces of the corresponding three stop pins, and then return the support bolts to 9 slots (you can hear 9 sounds), so that the end faces of the three stop pins The gap between it and the end faces of the three support bolts is (2.25±0.5)mm.

(4) Adjustment of the distance between the head of the three separation levers and the rear surface of the rear driven disc. When repairing, replacing parts and reinstalling the clutch assembly, the adjustment nut should be unscrewed (or screwed in) so that the distance between the three separating lever heads and the rear face of the rear driven plate meets the requirements. The total length of the clutch equipped with the coil spring is 39.7-40 mm; the total length of the clutch equipped with the disc spring is 42.5 mm.

The above is about the adjustment methods of different types of clutches, but it is worth noting that when adjusting the clutches of various models, please refer to the instruction manual provided with the car by the manufacturer.

As an important part of the tractor, the clutch must be reasonably matched to fully satisfy the use of the tractor clutch. It needs to be lubricated in the process of use. Then in the process of selecting lubricating oil, what should we do? to operate it?

We want to make high-quality lubricating greases from base oils, thickeners and additives. The performance of different types of greases with different grades of the same type is very different, and the allowable rotation limits are also different. Therefore, the tractor clutch must be clear when choosing!

1. The choice of diesel

Diesel is divided into light and heavy diesel, and agricultural tractors generally use light diesel. Light diesel oil is generally divided into No. 10, No. 0, -10, -20, -35 and other grades according to its freezing point. In order to save money, in many areas, apart from those who are engaged in transportation in the cold winter, they need to prepare -35 oil. Generally, they only need to prepare two kinds of diesel oil, 0 and -20, for agricultural production. Use No. 0 diesel in summer and No. 11 in winter. In other areas, the appropriate number of diesel can be selected according to the specific local temperature.

2. The choice of oil

Diesel engine oil is required for agricultural diesel engines. Diesel engine oil is divided into three types: No. 8, No. 11 and No. 14. Generally, use No. 8 oil in summer and No. 11 oil in winter.

3. Selection of gear oil

Gear oil is divided into 20th and 309th. 30 in summer; 20 in winter. Here to remind the owners of the machine, it is strictly forbidden to use engine oil instead of gear oil, or to mix diesel and kerosene in the gear oil, so as not to reduce its viscosity, weaken the lubricating performance, and accelerate gear wear.

4. The choice of butter

The selection of butter for diesel engines cannot be “one size fits all”, and must be selected according to the various components of the diesel engine:

(1) For parts that are in direct contact with water or moisture and have a lower working temperature, calcium-based grease or synthetic calcium-based grease can be selected.

(2) For parts with high working temperature, composite calcium-based grease can be selected to synthesize calcium-based grease.

(3) For parts with high temperature that are not in contact with water or moisture, sodium-based grease or synthetic sodium-based grease can be used.

(4) When the temperature is high, the working temperature is high and the load is large, the grease with a higher grade should be used.

(5) Under normal circumstances, use high-grade butter in summer; use low-grade butter in winter.

The above is all about the selection of tractor clutch lubricating oil. In fact, when making selections, you should fully understand the performance of lubricating oil paper. You should ask the manufacturer for relevant suggestions. You must know that the performance of lubricating grease is determined by the base oil. A reasonable understanding of its water resistance can further improve the use effect of the tractor.

Tractor clutch friction discs are divided into inner friction discs and outer friction discs, which are usually installed inside the tractor clutch. The clutch of the tractor is mainly composed of clutch piston, end plate, drum, disc drum, outer friction plate, inner friction plate, pressure plate and spring, etc. There are three wet shift clutches in total (two for shifting, one for for reversing), which are hydraulically engaged.

Tractor clutch friction plate

1. Transmission of rotational torque. The tractor engine flywheel is the driving part of the clutch, and the driven disc and driven hub with friction discs are connected with the driven shaft (ie, the driving shaft of the transmission) by sliding splines. The compression spring presses the driven disc against the end face of the flywheel.

2. The torque of the tractor engine is transmitted to the driven disc by the friction between the flywheel and the contact surface of the driven disc, and then transmitted to the driving wheel through the driven shaft and a series of components in the drive train. The greater the compression force of the compression spring, the greater the torque that the clutch can transmit.

Precautions for the replacement of tractor clutch friction discs

1. The driven disc assembly should be kept clean, and the tractor clutch friction plate must be dust-proof, anti-fouling and oil-proof. Before assembling on the engine, the surface of the pressure plate and flywheel should be wiped clean to remove oil stains to prevent the clutch from slipping.

2. The tractor clutch has been adjusted before leaving the factory under normal circumstances, and it does not need to be adjusted during installation.

3. In order to ensure the smooth operation of the clutch, the clutch pressure plate assembly and the driven plate assembly have been balanced before leaving the factory. Do not replace the spare parts at will during use. When the tractor clutch must be disassembled for repair, mark it first, then assemble and rebalance according to the original mark after repair.

4. When assembling or disassembling the clutch on the tractor engine, you must alternately tighten or loosen the bolts or nuts that fix the clutch on the flywheel.

5. When installing the clutch, lubricate the spline of the driven disc and the spline of the first shaft of the gearbox with temperature-resistant and pressure-resistant grease properly to ensure that the driven disc can move freely on the spline of the first shaft of the gearbox. It should be noted that excessive lubrication will cause the tractor clutch friction plate to slip.

6. Great care must be taken during installation, not to damage the splines of the driven disc, and to prevent the axial movement of the driven disc from being stuck and unable to separate due to burrs.

7. It must be ensured that the tractor clutch release stroke meets the requirements. If the separation stroke is too large, it is easy for the release lever to hit the driven disc, which will bring danger; if the separation stroke is too small, the tractor clutch will not be completely separated.

8. When the clutch is in the engaged state, there should be a gap of 2-3mm between the release bearing and the release ring, so as to prevent the pressure plate from pressing the friction plate when the tractor clutch friction plate is worn, so as to ensure reliable transmission. engine torque.

9. The release bearing must be able to slide freely on the first shaft sleeve of the gearbox, so the sliding surface should be kept fully lubricated, and the sleeve must be positioned correctly.

10. When the tractor clutch friction plate is worn to the specified wear limit, the driven disc assembly should be replaced in time. To prevent the clutch from slipping and scratching the surface of the pressure plate and flywheel.

11. Be careful when handling the tractor clutch, do not drop it. During transportation, do not lift the separation ring to avoid deformation of the torsion spring.

12. Use it correctly to avoid slippage of the tractor clutch caused by improper operation. The tractor driver is strictly prohibited from stepping on the clutch pedal all the time. In principle, it is required that the clutch should be opened quickly, and the pedal should be pressed to the bottom. occur for a long time.

It is not allowed to start with a large accelerator and a high gear; when shifting from a low gear to a high gear, the accelerator is engaged before the vehicle speed is high enough; starting on a steep slope several times in a row; the vehicle slips or the wheels sag on a muddy road Under such circumstances, the driver uses the method of increasing the accelerator and half-clutch to force the rush, etc. In this way, the clutch will generate high temperature due to continuous severe friction, resulting in burnout of the friction plate, deformation of the pressure plate and even thermal cracking, resulting in serious consequences.

13. In the daily maintenance of the tractor, attention should be paid to the inspection of the clutch release operating mechanism of the tractor, and the leakage of the pump and pipeline should be eliminated in time to ensure the normal operation of the tractor clutch.

The above is all the introduction to the precautions for tractor clutch friction plate replacement. I hope that through our sharing this time, everyone will have a deeper understanding of its replacement, which can effectively improve the work efficiency of the tractor.

The clutch is an important part of the tractor. Only by mastering the correct installation skills can the working efficiency of the tractor be improved. At present, small four-wheeled tractors and three-wheeled transport vehicles mostly use double-plate dry friction clutches, which are easy to disassemble but troublesome to install. For this kind of tractor, the tractor clutch manufacturer has summarized some installation skills, let’s learn about it together!

(1) When installing the driven friction plate assembly, the shorter ends of the two driven disc hubs should face each other. If two long hubs or one long hub end is opposite to one short hub end by mistake, the moving plate will be suspended in the middle of the two driven discs, and the torque cannot be transmitted, causing the clutch to slip.

K series

(2) The inner and outer bearings of the clutch (60206 and 602024 bearings respectively) are single five-pointed star concentric ball bearings with an oil-proof cover on one side. When working, the grease in the bearing is thrown into the surface of the friction plate, causing the clutch to slip.

(3) When there is no special tool for assembly, the three small springs can be compressed by 20-22 mm and tied symmetrically with cotton threads, and then the bundled small spring dustproof rings can be placed on the three separate mechanical rods respectively; After the clutch is installed, remove the cotton thread.

(4) When tightening the 6 nuts on the cover of the casing, tighten them diagonally several times. After tightening, the end must not protrude from the side of the V-belt groove to avoid rubbing the belt.

13-Inch

(5) When installing the release bearing, the side with the thrust ring should face the release lever, otherwise it will aggravate the wear of the release lever.

(6) When installing the clutch release claw seat, care should be taken to make the oil collecting tank directly below to prevent the lubricating oil from being thrown into the clutch shell and causing the transmission belt to slip.

(7) After the clutch is installed, push the clutch housing along the axial direction by hand. At this time, there should be no obvious shaft problem, otherwise it should be disassembled for inspection.

I will share so much with you about the installation of small tractor clutches. I hope it can help you better. If you have any questions during the installation process, please feel free to contact us.

During the use of the tractor, as the workload increases, the technical conditions of the tractor will gradually deteriorate. Over time, the tractor assembly, mechanism, system and other parts and components will partially or completely lose their working ability, which will eventually make the tractor work. The power of the tractor is reduced, the economy is deteriorated, the reliability is reduced, and various appearance symptoms will appear one after another, and the clutch is one of the most frequently faulty components. Being able to grasp the common failure phenomena of tractor clutches and analyze the causes of failures is of great significance for the correct maintenance and use of tractors.

Common symptoms of tractor failure

40-Type-18-Spline

Clutch slip

1. If there is oil stain on the friction plate and pressure plate, clean it with gasoline to remove the fault;

2. If the friction plate is too worn or burned, the clutch plate should be replaced in time;

3. The pressure of the disc spring is reduced, and the disc spring should be replaced;

4. The free stroke of the pedal is too small, or there is no free stroke, re-adjust the free stroke of the pedal as required;

5. The clutch driven plate is seriously deformed, replace the clutch driven plate.

The clutch is not completely separated, and there is a noise in the gear shift

1. The free stroke of the pedal is too large and the working stroke is too small. Adjust the free stroke of the springboard to 25-30mm;

2. The clutch driven disc is seriously warped, and the driven disc should be replaced immediately;

3. There is oil on the friction plate and the driven disc, and the friction plate and the driven disc should be cleaned;

4. The heads of the three separation levers are not in the same plane and should be adjusted to the same plane as required.

 The tractor shakes when starting

1. The heads of the three separation levers are not in the same plane, adjust as required;

2. There is oil on the friction plate and the driven disc, and the friction plate and the driven disc should be cleaned;

3. The clutch driven disc is seriously warped, and the driven disc should be replaced immediately;

4. If the fixing screws of the flywheel and the clutch housing are loose, stop the machine immediately to check and troubleshoot.

Common causes of clutch damage

1Z4A4280

1. User problems. The main reasons are the bad habit of half-stepping the clutch pedal or using the half-step clutch to control the speed of the vehicle; the free travel of the clutch pedal is too small, disappears and cannot be adjusted in time; the agricultural tools are too large and the ploughing depth is too deep and the load is too heavy.

2. Design problems. The maximum torque capacity transmitted by the clutch is insufficient, causing the clutch to slip and burn. Especially in the popular small chassis and high-horsepower tractors, the engine horsepower has increased, and some models have the original clutch, such as 1604 and 1804 tractors still use 13-inch tractors. The clutch is very prone to burning chips during use. The reason for the insufficient capacity of the clutch to transmit the maximum torque is that the compression force of the disc spring is insufficient, the size of the friction surface is small, and the friction coefficient of the friction plate cannot be reached.

3. Parts quality problems. It is mainly caused by the quality problem of the clutch itself. The tractor clutches produced in the early days were too heavy. In order to reduce the clutch pedal force, the method of reducing the pressing force of the disc spring and increasing the friction coefficient of the friction plate was adopted. The original intention was that the ability of the clutch to transmit the maximum torque remained unchanged. The compression force of the disc spring of the clutch manufacturer has been reduced, but the friction coefficient of the friction plate has not been effectively improved, resulting in a large number of clutches burned on the tractors sold on the market as soon as they work in autumn farming, which has a very bad impact.

4. Improper assembly adjustment and backward production process. The clutch assembly and adjustment technical requirements of high-horsepower tractors are relatively high. Some tractors have the situation that the clutch assembly is not in place and the factory technical state adjustment is not in place, which causes the clutch to burn out as soon as the user goes to work in the field after purchasing the machine.

By analyzing the failure phenomenon of the tractor, the driver can easily find out whether the tractor has a failure during the operation process, analyze the cause of the failure, and lay a good foundation for further repair and maintenance, which can reduce the damage of the tractor and reduce accidents. occurrence has a positive effect.

In modern agricultural production, tractor is a very important machine, and no other machine can replace the work of tractor. Therefore, tractor is widely used in agricultural production at home and abroad.

The use of the tractor clutch can ensure the smooth shifting and shifting of the tractor, and is one of the important accessories to ensure the normal operation of the tractor. With the development of society and the advancement of science and technology, knowledge such as electricity, heat, and information technology has been gradually applied to the machinery manufacturing industry, and the manufacturing technology of tractors has also improved, and has begun to gradually develop towards informatization, which has a great impact on the quality and performance of tractor clutches. Requirements have been further improved. Therefore, the research on the working principle of tractor clutch, how to use it and its maintenance and repair is also the work that tractor manufacturers and users have been doing all the time. Today, I will simply share with you how the tractor clutch works, precautions for use and how to overhaul.

How the tractor clutch works can be understood from its structure and working principle.

The composition and working principle of the tractor clutch

The tractor clutch is mainly composed of four parts, namely: the active part, the driven part, the pressing device and the operating mechanism. The clutch is mainly composed of a flywheel and a pressure plate of the clutch. The flywheel is directly connected to the crankshaft of the engine and is controlled by the crankshaft; the clutch pressure plate is connected to the gearbox, and the transmission force is transmitted to the gearbox through the combination of the flywheel and the clutch pressure plate. The gearbox performs shifting work. In the process of using the clutch, there are two states, namely the combined state and the disengaged state. When the clutch is in the engaged state, the pedal of the clutch is at the highest position, at this time, there is no contact between the release lever in the clutch and the release bearing, and the clutch pressure plate presses the driven plate, thereby transmitting the transmission force to the transmission; while in the disengaged state When the clutch pedal is stepped on, the gap between the release lever and the release bearing is eliminated. At this time, the pressure plate and the release lever move downward under pressure, causing the pressure on both sides of the driven plate to decrease and disappear. The transmission force is transmitted to the transmission, that is, the disengagement state of the clutch.

tractor clutch

Precautions for the use of tractor clutches

1. When starting, the clutch pedal should be lifted correctly

When the tractor is just starting, the clutch pedal should be stepped on correctly, and the clutch plate should not be lifted violently, which will make the clutch combination not stable enough and cause great damage to the friction plates. The correct starting method should be “fast, slow, slow”. When the tractor starts, quickly make it in a low gear, and pause to find the contact point at this time, and then change to a high gear to protect the safety of the tractor clutch. , to avoid unnecessary safety accidents caused by clutch damage when the tractor starts.

2. Be quick and thorough when separating

The disengagement speed during the disengagement process of the tractor clutch is generally in the opposite state to that during the combination process. When disengaging the clutch, care should be taken to do it quickly and thoroughly to avoid slow disengagement, which will cause a lot of heat due to friction, which will cause serious burn damage to the friction plates, seriously affect the life of the clutch, and be extremely harmful to the clutch. big. Therefore, when disengaging the clutch pedal, attention should be paid to the speed and degree of disengagement to protect the clutch from damage.

Tractor clutch overhaul

For the tractor used for farming, there will be a situation of not using it for a long time. If there is no good machine maintenance habits, it is likely to cause some small parts of the clutch to fail.

For example, the clutch will rust due to long-term non-use. At this time, the clutch should be removed in time and the rust should be cleaned up.

Or there will be clutch slippage, and this kind of failure is mainly caused by the following factors: such as oil on the surface of the friction plate; too small or no free clearance of the clutch; wear of the friction plate; broken or weakened elastic force of the pressure spring; driven disc Warping and deformation, the unevenness of the flywheel and the pressure plate plane is too large; the return spring is loose or broken, etc. At this time, we should take an appropriate maintenance plan according to the cause of the clutch failure.

I believe that through this article, you have a better understanding of the working principle, use precautions and maintenance of tractor clutches. As a manufacturer and trader specializing in the research and development and production of tractor clutch assemblies and clutch plates, our products are all It meets international quality standards and is well-received in a variety of different markets around the world.