How to change gears on Zubr power tillers

Features of transmissions in power tillers

A gearbox for any class of power tiller is a must. Even for such small-sized machines controlled by hands the possibility to change speed is not a whim but a vital necessity. Such transmission also provides a reverse gear (reverse), but many manufacturers put on the market models without reverse gear. this makes the technique cheaper and safer.

change, gears, zubr, power, tillers

There are different ways to transmit the rotational motion of the motor crankshaft to the axle of the motor block:

  • The belt transmission is structurally the easiest and cheapest to produce. Such a mechanism usually consists of several pulleys connected by a belt. Repair of such a transmission is also not difficult, but the reliability of belt transmission is not high. the belt over time stretches, slips, wears out and breaks. Heavy loads are not for him, so the belt transmission is used on low-power models of low weight;
  • The chain drive is a step up. It is the most popular box on motor blocks: not very expensive, quite reliable, copes well with heavy loads. The chain drive is installed on mid-range motor blocks, and is found on some heavy-duty models;
  • the most reliable type of transmission for small machinery is considered to be the gear type. It consists of several pinions of different shapes, cylindrical or cone-shaped. This gearbox has many times the number of gears. The typical value for heavy power harvesters is six front and a couple of rear. Of course, this box is the most expensive, a breakdown usually requires replacing one or more gears.

Many manufacturers combine these methods in their products, trying to bring the advantages of some transmissions and avoid the disadvantages of others. Thus, it is quite common to see units that have a gearbox of the gear type (or chain), and the transmission is implemented by a belt drive. The good thing about this method is that the belt is very likely to be damaged by overloading, but the gearbox is unharmed.

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Quite often there is a gear-chained transmission, whose main advantage. a decent endurance.

As for the rear gear itself, there is a completely different policy of manufacturers. Some offer reversing even for cheap models, while others try to avoid using reverse gears.

In general, the logic can be traced. Small motor blocks equipped with two-stroke engines and weighing no more than 30 kg., can be unfolded on the spot without considerable effort. So the presence of reverse gear here is a redundancy, given that such a design is more complex, it increases the weight and size of the product and creates additional complexity in the service and repair of power tillers.

Heavy-duty power tillers, designed for working large areas and heavy soils, are another matter. It is difficult to maneuver such a machine without reverse gear, so such models usually have reverse. And the most popular and widespread models of the middle class. here God willing. Even the same model in different generations may or may not have a reverse gear.

Also makes a difference with the gearbox type: pinion and chain drives allow you to reverse with the motor off. And if you use a worm gear, you won’t be able to reverse without a reverse, you’ll just have to pull the single axle tractor back if you need to. You’ll need a lot of strength and stamina for a 50- to 80-pound beast. Fortunately, worm gears are mostly installed on lightweight models, which can easily be lifted and moved or unfolded, even if the motor is off or the gear is blocked.

Power tiller gear box repair/arm shaft uninstall,repair and install very easy.

But it’s a distinct advantage to have reverse. Its absence sharply reduces the functionality of the power tiller, so many owners decide to modify the gearbox with the only purpose. to provide reversible motion of the power tiller.

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Suitable for conversion models of MTZ

If you have made the decision that it is time to convert a single-axle MTZ tractor into a mini-tractor, no doubt, you may be puzzled by the question: “And what exactly is the best model of MTZ to convert”. The answer is obvious. any, up to 05 models of Belarus, which are in good condition and also serve their owners faithfully.

change, gears, zubr, power, tillers

The advantage of Belarus models over other manufacturers is that they are all powerful and heavy, which means they will be stable on the ground as a tractor.

The last models MTZ 09H and MTZ 12, which have excellent technical characteristics, are best suited for conversion. However, success can only be achieved by clearly following the drawings and diagrams. Because otherwise, the mini-tractor will not stand the test of work. The most popular model is considered the MTZ 09H, but it is best to make it a four-wheeled design, since a three-wheeled one will be unstable.

Accessories

After reading the general data of the model, let’s learn more about its major components and set of attachments. This is what you look for when choosing such equipment.

Transmission

The transmission has a range reduction, which is convenient when working at low rpm. The mechanism itself is closed by a solid body, so the oil is less clogged. Torque transmission shafts are docked to the drive and gearbox. In these places there are sturdy gaskets.

Let us mention another useful option. You can put a second gearbox under the engine, which increases the power when connected. It is suitable for leisurely hauling a heavy trailer or cultivating tough soils, where speed is not much of an issue. with the features of using the “Neva MB 2” power tiller.

Read also: Overview of hillers and ploughs for MTZ power tillers

Such a single-axle tractor “Zubr“, as we already know, has a diesel engine capacity of 12 liters. с. It is mounted horizontally, which makes it easy to service. Everybody knows about economy of diesels. a injector (it is the same as a mono-injector) is much “thriftier” than carburetors.

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For the stable operation in different modes liquid cooling system is used (“airman” would not cope with such loads). The heat from the motor’s red-hot parts is absorbed by the grease supplied by the gear pump. It is aided by a special condenser that runs on the output.

It is important! To protect the motor, some owners don’t give it a full load. But it is necessary to make such procedures for diesels (at least for some hours). long idling is also harmful.

The electronic ignition module can be replaced by the usual mechanical one, which is used in the cold season (when fuel is poorly ignited).

The “engine” itself with all systems is quite heavy.115 kg. But this is offset by the good traction and long service life of all components.

Attached and auxiliary equipment

Basic set includes plough and tiller. The list of extras is much more extensive and includes:

  • ploughshare;
  • various riders;
  • plow (standard or reversible);
  • harrow with a wider grip;
  • mouldboard;
  • potato planter;
  • potato harvester (as a screen, and standard);
  • mower;
  • wheel extensions;
  • weights.

For installation of such superstructures the body of the power tiller is equipped with brackets and fixing “ears”. For extensions and axles provide special niches. But it is not enough for some devices. you have to install adapters, too. Learn how to make attachments for your power tiller with your own hands.

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