Combine harvester "Niva SK 5": description, features and reviews.

"Niva SK 5" is practically a legend of domestic engineering. This very compact harvester appeared more than 40 years ago. At that time it was the most popular model, massively used in the fields of the USSR. The company "Rostselmash" continued the release of this version, only now it is a modernized and high-tech unit. New machines are distinguished by excellent technical data, and are able to compete with eminent foreign analogs.

Typically, these machines are used by farmers who have small areas for crops. These are farms where the use of high-performance equipment is unprofitable, and in almost all cases - it is inappropriate. The combine "Niva SK 5" is practically indispensable in small areas, thanks to this the demand for this equipment does not fade from year to year.

History of appearance

Plant "Rostselmash", known throughout the country and far beyond its borders, began the production of agricultural machinery as early as the beginning of the last century. The first copies came off the assembly line.

Combine harvesters "Niva SK 5" appeared in 1973. This model served as a kind of base for the further creation of highly specialized machines, for example, such as:

• Aggregates for working on slopes, the size of which reached 30 degrees;
• Rice harvesters, and others.

In the future, the fifth model has not been upgraded once. In the modern market, the car was named "Niva-effect".

Technical data

The letters in the title are deciphered as a "self-propelled combine", and the figure indicates its performance, in this case it is 5 kg / s. Other characteristics of the combine "Niva SK 5":

• Dimensions: length - 7607 mm; Width - 3930 mm; Height - 4100 mm.
• Weight - 7,4 tons.
• Rotational speed of the threshing mechanism, represented as a drum, is 2900 rpm.
• A bunker with a capacity of 3000 liters.
• 64 knives are installed.
• The header width is 5 meters.

Power unit

The buyer is presented with five different engines, which can be equipped with a combine "Niva SK 5":

• SMD-17K and SMD-18K, the power of which is 100 liters. from.
• SMD-19K; SMD-20K; SMD-21K, their strength is 120 units of power.

All five models are 4-stroke, with 4 cylinders, in-line design, working on diesel fuel material. 120-strong versions come with supercharged. Before coming directly to the turbine, the air is forced to cool. This allows you to eventually increase power. Modern machines "Niva-Effect" are equipped with 155-strong "heart" with marking D-260. This engine has a lower fuel consumption level. A large reserve of torque ensures stable and reliable operation even under heavy loads.

Transmission

All versions of the combine are equipped with a V-belt drive. This indicates that the moment from the power unit to the transmission shaft is transmitted using a V-belt transmission, the so-called variator. This allowed to improve the possibility of adjusting the combine "SK-5 Niva".

Variator is used for the possibility of changing the gear ratio. The working process is carried out due to axial displacement of the element from the master unit. Depending on the position of the discs, the width of the stream varies, depending on this parameter, the radius of the belt's bending changes.

The control is carried out from the cockpit. In the maximum extended position of the slide valve - set the maximum speed, and when it is set to the "back" - the minimum.

Working Equipment

The header "Niva SK 5" is designed for cutting and subsequent transportation of grain mass for further processing in a threshing machine. Additionally, a pick-up can be installed, used to select the previously mown stems, which were stacked in rolls. The size of the header can vary, depending on the tasks assigned, but the design remains unchanged, and consists of:

• Shell with special shoes;
• Reel;
• Cutting apparatus;
• Auger;
• Conveyor of floating type;
• Pick-up.

Advantages

Specialists with extensive experience in harvesting machines almost unanimously assert that the main advantage of a combine is its efficiency, and at the same time a relatively low price. The technique is simple in design, and easy to maintain. Spare parts for the combine "Niva SK 5" can be purchased without any problems, at an affordable price. Such a machine is an excellent choice for working in modern climatic conditions of the country, with specific soils characteristic for individual regions.

disadvantages

Against the backdrop of all positive qualities, there are also disadvantages, which greatly complicate the use of the combine harvester. The main disadvantage is the variator's working part. Belt drive does not allow a smooth run on relatively soft ground, with a full bunker. A special reliability can not boast of a system of attachments header.

In all other respects, it is a good harvester for those farmers who want to purchase inexpensive, but proven technology with simple maintenance.

Modern models and their improvements

After a number of upgrades and improvements, Niva SK 5 received new fluorine rubber seals instead of the old rubber ones, which are characterized by a small resource. The reliability of the hydraulic system is ensured by the cleanliness of the oil due to tight connections that prevent air from entering the interior. The oil should be changed every 50 hours. After modernization and improvement, the life of the lubricant increased to 240 hours.

All modern harvesters from the Rostselmash enterprise use reinforced German-made drive belts. The reliability of these elements is proved by a number of tests. This allowed to increase the working time of the variator, thus increasing the efficiency of the grain harvesting machine.

Availability

In the modern market, the combine "Niva SK 5" is considered to be almost the most affordable option among all presented. The cost varies from 160 thousand rubles (for this money you can get a car that will be on the move, but it will be necessary to carry out a number of repair measures to restore the working condition) and up to 600 thousand (the condition will be good and as close to the ideal as possible, otherwise it is inappropriate for Such a sum to buy a car, and then carry out repairs).