The clutch is an integral element of the transmission, the task of which is to transmit the torque received by the crankshaft to the gearbox and disconnect the gearbox from the engine when changing the speed of the walk-behind tractor. It is thanks to the presence of this mechanism that the agricultural machine moves off smoothly and can stop without completely turning off the engine.
Clutch for walk-behind tractor - design and principle of operation
The clutch of absolutely any agricultural machine consists of a number of elements. The design of the mechanism includes:
- Constant control device;
- Master node;
- Driven components.
The design of the control mechanism includes a release lever connected to the pressure disk via a pedal lift and rods. When the clutch device of the unit is blocked, a signal is generated that is received by the release levers. They, in turn, disconnect the driven disk from the pressure housing, as a result of which the mechanism is turned off.
The bearing in the clutch assembly of a modern walk-behind tractor serves to reduce friction, while eliminating contact between the levers rotating around their axis and the completely stationary linkage. The spring is responsible for returning the control mechanisms to their original position. At the same time, the branch is pushed away from the levers to the distance required for final shutdown.
Types and description of clutch mechanisms for walk-behind tractors
Depending on the design features of walk-behind tractors, agricultural units can be equipped with the following types of clutch:
According to their type of friction, clutch mechanisms are divided into dry ones, as well as devices operating in air or in a bath of motor oil. Depending on the initial launch mode, there are non-permanently open and permanently closed clutches on sale.
Do-it-yourself clutch for a walk-behind tractor
Regular operation of the clutch system involves constant friction of its parts, which is why even the most reliable mechanism sooner or later it becomes unusable. After this, you can buy a new device, or try to make a homemade clutch for an agricultural machine.
Before making a clutch for a walk-behind tractor, you will need to prepare certain parts. To work you will need:
- Flywheel and input shaft taken from a gearbox from a Soviet Moskvich;
- Steering knuckle and serviceable hub from Tavria car;
- Driven pulley equipped with two handles;
- Crankshaft from a GAZ-69 car;
- B-profile.
- First, grind the crankshaft you are using so that it does not touch other internal elements devices;
- Next, place the standard hub of your walk-behind tractor on the shaft;
- Make a hole in the surface of the shaft to install the bearing. As a result, the hub should be installed without the slightest gap, and the pulley itself should rotate freely around its axis;
- After this, turn the crankshaft over and do the above steps on the reverse side;
- Then make 6 holes in the pulley using a drill with a 5mm bit. There should be the same distance between the holes. Please note that 10mm bolts will be screwed into the holes, so reverse side the pulley also needs to be drilled;
- Place the pulley on top of the flywheel and bolt the two parts together. Next, mark the places where you need to drill holes. Please note that they must line up with the holes previously drilled in the pulley;
- Pull out the pulley and drill small holes in the flywheel;
- Grind the surface inside the flywheel and shaft so that the parts do not touch each other;
- The mechanism should include the clutch handle on the walk-behind tractor. To make it, take a pipe 30 mm long and about 10 mm in diameter, and fasten it to the pulley;
- The walk-behind tractor clutch cable can be taken from old chainsaw, or buy a new cord and wind it on a reel.
The self-made clutch is suitable for installation on Agro, Neva MB-2 walk-behind tractors and other brands of agricultural machines.
Currently in agriculture and gardening, special equipment is often used. Here, equipment such as a walk-behind tractor stands out separately. These devices allow you to quickly and efficiently process the soil. However, like any type of equipment, such equipment can also fail. The important components of this device are the motor and transmission. These two components work together, and the coupling is carried out through the clutch disc for an Agro walk-behind tractor or other type of equipment. IN in this case It is necessary to consider in detail how the clutch is replaced and repaired on an Agro walk-behind tractor.
You can repair the clutch in this walk-behind tractor yourself
Design and principle of operation of the element
This mechanism, which, at first glance, has complex design, in practice consists of only a few elements, namely:
- Release bearing.
- The basket where the disks are installed.
- Directly a disk, which, under pressure, diverges into several separate components.
You can also note the presence of couplings and traditional bolt clamps, due to which the structure is mounted on the working plane. The clutch assembly is mounted above the transmission. This device allows the engine main gear to align smoothly with the transmission gear.
If the clutch is missing or damaged, switching becomes difficult, and a metallic crackle is heard at the moment of switching on, since during operation it is difficult for the gears to align at different rotation speeds. In this case, smooth shifting is ensured by a handle from which a cable goes to the mechanism itself. This handle is released when switching.
In this video you will learn how to repair a clutch:
Important! Despite the simplicity of the mechanism, it cannot be said that the element can be easily replaced or repaired; in order to restore or replace a structural component, some skills and experience are required.
DIY repair
To repair the clutch of an Agro walk-behind tractor with your own hands, first of all, you should understand what kind of malfunction we are talking about, since a number of damages cannot be repaired at all and require replacement of the consumable element. Let's look at the main types of faults:
- the release cable has come off (to eliminate this breakdown, you need to check the device for integrity, and then fix it in the same place; you do not need to disassemble the mechanism for this);
- the basket is damaged (these products are made of steel or cast iron, so in case of minor deformations, straightening can be done; this requires completely removing the structural element);
- the release bearing is jammed (here you need to squeeze out the tension cable and try to return the device to its place, but there is no need to dismantle the entire mechanism).
If the ceramic disc is damaged, the basket is burst or severely deformed, and the release bearing is worn out, then repairing the part is unwise, as replacement is required structural element, while there is no need to completely change the clutch of the Agro walk-behind tractor.
Important! To replace any consumable item, you need to completely dismantle the device from the walk-behind tractor.
Adjustment
In progress long service life This mechanism gradually wears out, which requires adjustment. Let's take a closer look at how this procedure is performed:
- first of all, you should choose a comfortable and spacious place;
- it is necessary to disconnect the clamps;
- it is necessary to release the tension cable;
- Next, you need to lubricate everything with a special substance;
- after this, the cable is tightened and the spring is shortened;
- the bearing needs to be turned to a more suitable position.
During the adjustment process, it is necessary to adjust the length of the cable so that squeezing the handle does not require much effort.
Important! When adjusting (adjusting) the clutch of a walk-behind tractor, it is necessary to lubricate the elements, otherwise there is a risk that the tensioner will break or will not be pressed out again well.
Product replacement
Changing this device is the most expensive process by financial standards. Although it is not necessary to change all components, experts recommend doing this at the same time. Let's look at how the procedure is performed:
- First of all, parts are purchased.
- Next, you need to completely dismantle the old product.
- All clamps are completely removed and the tension cable is removed.
- After this, you need to clean the landing site.
- Next, the new parts are assembled into a single mechanism.
- The device is mounted on the seat.
- The tensioner is connected to the release bearing through a spring.
- The entire structure is fixed using fasteners.
At first glance, there is nothing complicated about this, but the process is complicated by the fact that it is necessary to remove the clamps, which also partially hold the transmission.
Important! Experts recommend replacing the entire device based on practice, since over time the parts wear in and grind down, which makes it difficult to combine a new disk and old basket, or vice versa, is quite difficult.
The clutch of a walk-behind tractor is an important element of the transmission, through which the engine crankshaft transmits torque to the gearbox mechanisms. Using this part, the engine and gearbox are disconnected when changing gears. It is due to the participation of the clutch that the walk-behind tractor moves smoothly and also stops without completely shutting off the engine.
Clutch functions in the design of a walk-behind tractor
Clutch operation is based on the action of a friction clutch. This transmission element performs several important functions, among which stand out:
- Uninterrupted transmission of torque;
- Suppression of torsional vibrations;
- Smooth gear shifting;
- Impact-free gear connection;
- Connecting and disconnecting a gearbox with an internal combustion engine;
- Disconnecting the transmission from the flywheel device.
The clutch device makes it possible to briefly disconnect the engine crankshaft and the power transmission of the machine. Thanks to the clutch, the vehicle starts and stops movement smoothly and without jerking.
Centrifugal clutch - design and advantages
This kind of element is worth highlighting among other designs due to its reliability and durability. It is used in automatic transmissions. Its design consists of the following elements:
- Flywheel;
- Pulley;
- Hubs with locking groove and key;
- Flange;
- Bushings;
- casing;
- Bearing;
- Retaining ring.
One of critical roles plays the differential device associated with the centrifugal clutch. It helps improve vehicle maneuverability and ensure smooth cornering.
Together with the clutch, the differential regulates the rotation of the walk-behind tractor wheels at different speeds. Moreover, the mechanisms that transmit power together act as wheel lockers. In some models of equipment, instead of a differential, a special device is installed that blocks one of the wheels of the walk-behind tractor at the command of the driver.
More modern models equipment is equipped with a friction clutch. It is mounted between the engine and gearbox. In this design, the driven parts are closely connected to the gearbox input shaft, and the driving parts are closely connected to the engine crankshaft. In most cases, both the driving and driven elements are made in the form of flat round disks, or in the form of a cone. Just like a centrifugal clutch, a friction clutch is activated by manipulating a separate handle.
Clutch operating principle
The clutch for a walk-behind tractor consists of several important elements:
- Control devices;
- Leading element;
- Driven parts.
The leading part consists of end side engine flywheel and pressure plate. The disk rotates together with the attached flywheel. At the same time, the disk can also move axially in relation to the flywheel. Between these two elements there is a driven disk, which is located on the driven shaft. Along the perimeter of the pressure plate there are spring elements in the shape of cylinders.
The function of springs is based on the compression of the disk they support. 
In this case, the other end of the springs is in contact with the casing. Thus, the springs maintain the clutch for the walk-behind tractor in a constantly engaged state.
The control mechanism is made of spin levers connected to the pressure plate housing via rods with a tap and a pedal. When disengaging the clutch, the owner of the walk-behind tractor engages the clutch cable, which transmits force to the release levers. When the springs are compressed, the levers move the driven disk away from the pressure disk, which leads to the clutch disengaging.
The bearing reduces friction by preventing the fixed link from touching the rotation arms. Most walk-behind tractor models are equipped with three levers located at an angle of 120 degrees relative to each other. With the help of a spring, each clutch lever returns to its original position. In this case, the layer moves to the distance required to turn off the levers. If this distance is not reached, the clutch begins to slip.
How to make a clutch mechanism with your own hands?
The clutch on a walk-behind tractor works on the principle that provides for increased friction of the components, so rapid wear cannot be avoided. In this case, you should try to make the mechanism yourself. The design of a homemade clutch will be composed of:
- input shaft of the gearbox and flywheel of the Moskvich car;
- hub and steering knuckle from Tavria;
- B-profile;
- Double groove driven pulley;
- Crankshaft from GAZ-69.
Subsequent work on assembling the mechanism looks like this:
- First, you will need to grind the crankshaft so that it does not interfere with other elements of the walk-behind tractor;
- We place the standard walk-behind tractor hub on the shaft;
- Next, you need to machine a place on the shaft for the bearing. This operation should be performed as accurately as possible so that the bearing fits perfectly on the shaft. As a result, the hub should fit without any gaps, and the pulley should rotate;
- Then turn the crankshaft over and do the same on the other side;
- Next, use a drill with a 5mm drill bit to make 6 holes in the pulley. The distance between them should be the same. Since 10mm bolts will be used, holes will also need to be drilled on the back of the wheel that drives the drive belt;
- Next, install the pulley on the flywheel and tighten both parts with a bolt. After this, mark the drill spots on the flywheel so that they coincide with the 6 holes in the pulley;
- Remove the pulley and drill holes in the flywheel;
- After this, put the pulley back on and securely tighten the structure with bolts;
- Grind the inner surface of the crankshaft and flywheel so that they do not hit each other.
The finished structure can be installed in a regular place in the walk-behind tractor. Do not forget to connect the cables, leading them as far as possible from the friction elements.
If the design of your walk-behind tractor does not have a clutch, then you can make a clutch frame for the walk-behind tractor with your own hands. This system must transmit torque from the engine crankshaft to the gearbox. The process is based on the effect of the clutch on the walk-behind tractor. In this case, the motor and gearbox are disconnected. Due to this system, the cultivator begins to move smoothly and stops without turning off the motor.
What tasks does the clutch for a walk-behind tractor perform?
The clutch for a walk-behind tractor performs the following functions:
- transmits torque;
- dampens rotational vibrations;
- shifts gears smoothly;
- connects gears;
- connects and disconnects the connection between the engine and the gearbox;
- disconnects the transmission from the flywheel.
Depending on the design of the cultivator, there are different types of clutch.
The centrifugal system uses a clutch cable on a walk-behind tractor, a flywheel, a shaft, a handle, a disk, and a washer. Under heavy loads the system slips, so it is not widely used.
The hydraulic clutch of the walk-behind tractor transmits movement to the piston when pressing on the pedal through a connecting rod, which directs the working fluid through the channel using a squeezing method. The piston acts on the lever through the connecting rod, the handle returns back using a spring.
Automatic clutch on the walk-behind tractor is installed on motor cultivators with high power engine. Single-disc and multi-disc systems ensure smooth switching on of the unit and the start of its movement.
How to make a clutch frame for a walk-behind tractor with your own hands
Let's look at how to make a clutch frame for a walk-behind tractor with your own hands. The belt clutch, which is installed on most cultivators, wears out quickly, the V-belt system does not have high strength and reliability, has low efficiency, and is not used for cultivators with a powerful engine. Therefore, many owners remodel and modernize such a system.
Let's look at how to make homemade mechanism clutch.
You need to take as a basis:
- flywheel and gearbox shaft from a Moskvich car;
- hub and swivel mechanism from the Tavria car;
- metallic profile;
- pulley;
- a steel billet from a GAZ-69 car, which can be used as a crankshaft.
The homemade product is made by sharpening a steel blank on lathe. This is necessary to put a hub on the manufactured shaft.
Modification of the walk-behind tractor clutch is carried out as follows. After installing the pulley on the shaft, you need to sharpen it seat according to the diameter of the pulley ring for the support bearing.
It is necessary that the hub fits on without gaps and that the pulley rotates well.
After this, you need to turn the device over and perform the same steps on the other side. Then, using a drill with a 5 mm drill, 6 holes are made in the pulley, located at the same distance from each other.
Since 10 mm bolts will be used, holes for the wheel, which is designed to drive the belt, are drilled on the reverse side using a drill with a diameter of 12 mm.
Then a pulley is mounted on the flywheel and holes are made with the same drill, and then the parts are tightened using a bolt.
While the pulley is located on the flywheel, make marks on the flywheel through the holes made in it. Then remove the pulley and drill these 6 holes.
After this, using 10 mm bolts, you need to tighten the structure. In this case, the thread of the bolt without a head should be 60 mm. The inside of the crankshaft should be sharpened using a blank. To ensure that the flywheel does not make impacts and moves smoothly, its surface must be sharpened and centered along the mounting hole.
The walk-behind tractor clutch is an important transmission element. It ensures the separation of the engine and gearbox during the gear shift process. Due to this, the walk-behind tractor begins to move smoothly from a standstill, and also ensures its stopping without completely shutting off the motor. How to properly adjust the clutch on a walk-behind tractor is shown below. If it is easier for you to perceive information visually, then you can refer to the YouTube channel of the AgroMotoCentre company, where video reviews of products are posted, as well as advice on how to use them. correct use. To watch the video, go to link.
Clutch operating principle
The clutch design for a walk-behind tractor includes several important elements, such as control devices, a drive element and driven parts.
The design of the driving part includes driven and friction discs. Springs are located around the perimeter of the pressure plate cylindrical. With their help, the disk they pick up is compressed. In this case, the other end of the spring is in contact with the casing. The control mechanism is made from spin levers, which are connected to the pressure plate housing using a tap and a lever.
Clutch adjustment
The clutch is the connecting link between the gearbox and the control lever, so you need to know how to adjust the clutch on a walk-behind tractor.
When the clutch fails, its failures are immediately visible:
- in this case, the clutch is fully depressed, and the walk-behind tractor breaks away. To eliminate these problems, tighten the adjustment screw;
- if the clutch is in the released state, but the walk-behind tractor still does not release desired speed or stands still, you need to loosen the screw.
If you hear a strange sound from the gearbox during use, promptly stop all work. The most common problem is insufficient oil or poor quality. It is necessary to check the oil level every time before starting work. If the oil is changed, but the noise does not stop, then you need to contact service center for diagnostics.
If problems with gear shifting are detected, the causes must be sought in the correct settings of the clutch, worn gearbox parts or worn shaft splines.
Knowledge about correct adjustment clutches on the walk-behind tractor will ensure your safety and efficiency of the work process. To purchase new products, you can go to!