Tractor K744 "Kirovets" - Technical characteristics

Category: TRACTORS

• History of creation
• Technical characteristics of the K 744 tractor
• Dimensional and mass parameters
• Power unit
• Cabin and steering
• Chassis and transmission
• Brake system
• Tank volume and fuel consumption
• Attachments
• Advantages and disadvantages
• Modifications K744R
• K744R2
• K744R3
• K744R4

To cultivate large volumes of agricultural land, high-power tractors are used. One of them is the domestic tractor K 744. One such tractor cultivates up to 5,000 hectares of land in one season. The machine is used not only in agriculture, but also in other fields of activity. Using the K 744 tractor, you can clear snow from coverings, tow heavy loads, etc.

History of creation

The Kirovets K 744 tractor has been produced at the St. Petersburg Tractor Plant since 1995. Russian and German designers were jointly involved in the development of the machines, and the first models were manufactured exclusively for export. In 2000, the St. Petersburg Tractor Plant began mass production of K 744P machines intended for the domestic market and for sale to allied countries.

Since 2002, the Kirovets K 744 tractor has replaced previous models such as K 701, K700, K703. 2014 was the year of complete modernization of the Kirovets K 744 tractor. Several modifications of this machine are produced at the St. Petersburg Tractor Plant. Starting from 2016, the models are equipped with an automated gearbox of our own production.

Not available:

Dimensional and mass parameters

As standard, the K 744P1 tractor has the following dimensions and weight:

• Machine length – 7100 mm. The total length with the hitch in the raised position is taken into account;
• Tractor width – 2865 millimeters;
• Height from the ground to the top edge of the exhaust pipe – 3845 mm;
• Vehicle clearance at the hinge axis is 460 mm;
• Wheelbase (distance between front and rear wheels) – 3750 mm;
• Tractor track width 2115 mm;
• Turning radius (outer wheel) – 7980 mm;
• Wheel size – 28.1 R26;
• The total weight of the equipped vehicle with single wheels is 14,000 kilograms;
• The weight of the tractor with dual wheels is 15,790 kilograms;
• Front axle weight - with single wheels - 8100 kg, with double wheels - 9000 kg;
• Rear axle weight – with single wheels – 5920 kg, with wheel twinning kit 6790 kg;

Technical and operational parameters of modification “-1”

Units and mechanisms

Diesel produced by JSC Avtodizel with a power of 220 kW at 1,900 rpm with a liquid cooling system:

• 8-cylinder arrangement V-shaped, displacement 14.86;
• direct fuel injection;
• mechanical speed control;
• specific fuel consumption in grams per kilowatt/hour of power 220;
• supercharging according to the “turbine and intercooler” scheme.

Transmission . The mechanical type device ensures changing 4 ranges of torque parameters without interruptions in the power flow. The gearbox gears are structurally reinforced in terms of strength. Cardan shafts of power axles manufactured by GEWES.

Gearbox with hydraulic power drive. In 4 ranges, you can choose one of 16 modes for moving forward and 8 backward.

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Axles are both driven, the rear axle can be switched off. The design of the cross-wheel differential mechanism is a self-locking free-wheel clutch. The final drive is provided by a planetary gearbox.

The sub-engine bridge is on springs, with telescopic hydraulic shock-absorbing devices. The load bridge is suspended rigidly from the frame.

Hydraulic system of working equipment (GRO)

The tractor is equipped with a GRO - LS-system with an axial piston pump unit and two pressure filters , which forms an adjustable flow of working fluid depending on the load and provides:

• flow volume 180 l/min;
• pressure parameter at the quick coupling output coupling is 185 bar;
• maximum pressure in GRO 210 bar;
• 4 pressure outputs for connection to systems of aggregated implements;
• accessible free discharge and drainage of gas distribution equipment, which eliminates the loss of working fluid and its overheating.

To reduce peak loads in the system, a hydraulic accumulator device is installed in the “spool – working equipment” line.

The Bosch-Rexroth hydraulic distributor is controlled by a cable drive from the cab. The output units of the gas distribution unit are routed to the rear semi-frame and are equipped with quick connection breaking devices.

Unit movement control

The steering wheel acts on the DANFOSS hydraulic steering system with a separate pump unit. The steering column is adjustable in angle and height.

The Wabco pneumatically controlled brake system has three circuits: two act on the brake drum pads of the tractor wheels, one on the towed vehicle.

The front axle is equipped with a parking brake with a spring-type energy accumulator.

Operator's cabin

• interior with a safety cage, equipped with ventilation, heating, air conditioning devices;
• pneumatically sprung operator's seat;
• passenger seat;
• cleaners for both glasses;
• two working front and rear headlights, two beacons with flashing light emission;
• reduction of forces on the steering hydraulic wheel by 3 times compared to analogues with standard control;
• switching gearbox modes with the joystick.

Power unit

Depending on the modification, the Kirovets K744R tractor is equipped with power plants of both domestic and foreign production:

• K 744R1 - equipped with the domestic YaMZ 238 (300 horsepower), or the foreign Cummins (306 hp);
• K 744R2 – TMZ (350 hp), or Mercedes (350 hp);
• K 744R3 – TMZ (390 hp), or Mercedes (401 hp);
• For 744R4 - TMZ (420 hp), or Mercedes (428 hp).

Models of the “standard” group are equipped with domestic units. Foreign engines are installed on cars belonging to the “premium” group.

Each of the above engines is a diesel unit with turbocharging power, which is sufficient for multi-purpose use of the machine. The engines are equipped with a combined cooling system (oil - water), this allows the tractor to be used at high ambient temperatures.

To improve starting in winter, pre-heaters are installed on power units. The engine is started using an electric starter. The engines are easy to operate and unpretentious to weather conditions. They have a long service life, low vibration levels, and meet international standards for harmful emissions into the atmosphere. You can also read about the Bison Tractor - Build it yourself.

K-744R2: technical characteristics

In the first modification “Standard”, the K-744R2 tractor is equipped with a V-shaped 8-cylinder turbocharged engine TMZ-8481.10 from the Tutaevsky Motor Plant, with a displacement of 17.24 liters and a power of 350 horsepower. The rated speed is 1900 rpm. Maximum torque – 1570 N.m. Rotation speed at maximum torque – 1300…1500 rpm.

TMZ-8481.10

In the second “Premium” modification, K-744R2 tractors are equipped with 6-cylinder Mercedes OM460LA E3A/5 , which are used on many heavy trucks in the world. This is a 12.8-liter power unit with 354 hp. The rated speed is 1800 rpm. Maximum torque – 1750 N.m. Rotation speed at maximum torque is 1300 rpm. Specific fuel consumption – 151 g/hp.h (205 g/kWh).

In addition to more powerful diesel engines, it differs from the K-744R1 in larger tires (800/65 R32) and greater operating weight (14.79 tons with a Mercedes engine and 15.25 tons with a TMZ engine).

Cabin and steering

To reduce operator fatigue during long-term work, the K 744R tractor is equipped with a comfortable cabin. It is located at a high height, which gives the operator a large viewing angle. Good tightness protects the interior from dust during operation. The air temperature in the tractor interior is regulated using air conditioning and autonomous heating. This makes it possible to use the tractor in any climatic conditions. The cabin design includes specialized protection that minimizes the risk of death of the tractor driver when the machine rolls over.

The cabin has two seats for the tractor driver and the passenger. For convenience, the operator's seat is height adjustable. The machine control levers are located in close proximity to the seat. This creates comfort for the operator while operating a multi-ton machine.

The following controls are located in the cockpit:

• Joystick gear shift;
• Pedals;
• Steering column. The steering wheel is height adjustable;
• Switches for windshield wipers, headlights, air conditioning, horn, etc.;
• Tractor hydraulic control levers.

Behind the steering wheel there is a block of instruments, warning lamps and an on-board computer. The instrument panel allows the operator to control the operation of tractor systems and mechanisms.

Purpose and features of the machine

Wheeled tractor for use in agriculture with a power plant power from 300 to 480 hp. With. It is used in conjunction with trailed agricultural complexes and implements.

The power of the power plant allows you to process wide (8-12 m) strips of agricultural crops at high speed, tow heavy-duty trailers, and efficiently use additional attachments (bulldozer blades, universal loading buckets).

Sufficient cross-country ability and maneuverability parameters, ease of maintenance, reasonable prices for a new vehicle and operating costs make the K-744r an effective traction unit in agriculture, road and industrial construction, and the transport sector.

The tractor is especially effective for use on large land holdings and for large-scale work on construction sites.

The tractor was designed to work in Russian conditions with its heavy soils, low quality fuels and lubricants, and an undeveloped network of rural technical service centers. In these circumstances, the following is important:

• spare parts and consumables are not in short supply and are affordable;
• technological maps for maintenance and repair have been sufficiently studied by service workers;
• simple and reliable design of the machine, allowing the possibility of maintaining the working condition of the equipment by the farms’ own mechanical service;
• the opportunity to participate in federal, regional and municipal financial support programs is provided;
• use of direct communication with the manufacturer.

Important! Powerful and economical power plants produced by YaMZ, TMZ, Mercedes-Benz, Cummins provide a torque reserve of more than 30%.

Turbo engines are equipped with a winter start system and are effectively cooled when operating under load.

A 4-mode mechanical transmission device with hydraulic power switching allows you to select the operating speed of the unit without interrupting the power flow.

Traction drive on all wheels, the design of the differential and final drives of both axles, and high-profile wheels that allow the possibility of doubling ensure cross-country ability on wet soils and high traction parameters.

The structure of the load frame is such that the wheels follow the soil relief, excluding significant longitudinal and transverse movements of the machine body. Power elements are designed for the use of heavy attachments.

Attachment with three-point mounting, equipped with an EHR position control device. The type of tow mechanism is pendulum.

Hydraulic system of working equipment (GRO) with performance control based on load parameters (LS-system).

Braking mechanisms operate separately on the wheels of the tractor axles and the trailed transport equipment. Three-circuit pneumatic drive system.

Modern solutions in the ergonomics of an all-metal cab with a safety frame, selection of the position of the operator’s seat, a good overview of the working area, the presence of heating and ventilation devices.

Brake system

The K744 tractor is equipped with a pneumatic braking system consisting of:

1. Belt driven compressor. Used to inject compressed air pressure into receivers;
2. Air receivers (cylinders). Serve to store a supply of air under pressure sufficient to supply the system;
3. Safety valve. Necessary to protect the system from excessive pressure build-up;
4. Brake valve. Used to control tractor and trailer brakes;
5. Hoses and pipelines;
6. Brake chambers. They act on the wheel braking mechanism under compressed air pressure. The cameras are rigidly attached to the tractor axles.

The operator controls the brake system by pressing the pedal in the cab. The K 744 is equipped with a connection head. It is necessary for connecting the air lines of the tractor and trailer. If the coupling breaks, the connecting head disconnects the lines, preventing air leakage from the tractor brake system.

Attachments

The Kirovets is equipped with a hydraulic system with a five-section distributor. The hydraulic system capacity is 180 l/min. As standard, the K744 is equipped with a three-point hitch with a quick hitch system.

Various equipment can be installed on the canopy:

• Trailers of any type;
• Rotary and fixed plows;
• Soil cultivators;
• Cultivators;
• Seeders and much more.

ATTENTION: The three-point hitch of the Kirovets K 744 tractor meets international standards. This makes it possible to connect equipment not only of domestic, but also foreign production.

Aggregated agricultural machines

1. Equipment for sowing: mechanical seeders, connected into modules with a total length of up to 12 m; pneumatic complexes that perform several agricultural operations per pass.
2. Cultivation equipment for controlling weeds, loosening the soil surface, distributing mulch, leveling and controlled compaction of the surface layer of soil. Connection into modules with a total length of up to 12 m is possible.
3. Various types of harrows for loosening and preparing the soil layer before sowing and killing weeds. Connection into modules with a total length of up to 12 m is possible.
4. Plow devices of various designs for preparing the soil for sowing. The number of plows per body ranges from 8 to 14.

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Advantages and disadvantages

The domestically produced Kirovets K744 tractor has a number of advantages:

• Quality of components. The frame and parts of the tractor are made of high-strength materials. This significantly increases the service life of the machine;
• Power point. The engine installed on the K744 has high power and unpretentiousness to the conditions of use;
• Big tank. The fuel tank allows the tractor to operate for a long time without additional refueling;
• Multifunctionality. Thanks to the universal trailed equipment, you can use the machine in various fields of activity;
• High cross-country ability. The K744 easily overcomes impassable areas of rough terrain, thanks to all-wheel drive and self-locking axle differentials;
• Maneuverability. The composite frame allows the machine to be used on land with limited area;
• Comfort and safety. The updated cabin reduces operator fatigue and makes work comfortable;
• Attractive price. Compared to foreign analogues, Kirovets, while not inferior in technical characteristics, costs much less.

Cabin of tractor K-744

On St. Petersburg energy-rich tractors, a two-seater cabin is installed, with a built-in safety cage, with improved thermal, vibration and noise insulation; equipped as standard with powerful air conditioning and heating systems.

Instead of a flat composite windshield, the K-744R is equipped with a one-piece panoramic glass. Radial roundings on the sides of this glass provide a wide field of view from the operator’s workplace. The rear window also has radius sides, and the side pillars do not limit the view at all. The side glass and cabin door in the K-744R cabin have become virtually completely transparent, equipped with convenient windows for ventilation. However, the increased area of ​​the cabin glazing is combined with an increase in the strength structure of its frame - by 20%, compared to the previous K-744, from the fourth generation of Kirov aircraft.

The interior of the cabin of the main PTZ model has been significantly transformed. A completely new steering column changed the perception of space and significantly improved ergonomics in terms of ease of operating the tractor and monitoring its parameters.

Modifications

K744 is produced by the manufacturer in 4 versions. Each differs in the power of the power unit. Each of the modifications will be briefly described below.

K744R

The model is equipped with a diesel unit with a capacity of 306 horsepower. The number of revolutions of the crankshaft is 2000 rpm. The front axle of the car is mounted on springs.

K744R2

The Kirovets K744R2 tractor is equipped with a German-made power plant. The design of the K744R2 tractor gearboxes is planetary type. This makes it possible to significantly increase the traction characteristics of the machine.

K744R3

Has technical characteristics identical to the previous model. The manufacturer replaced only the power plant with a more powerful one.

K744R4

The K744R4 tractor, the technical characteristics of which have been improved compared to previous modifications, completes the model range. The K744R4 tractor is equipped with a 420 horsepower engine.

REFERENCE: Each modification can be additionally equipped with:

• A set of tires;
• track kit;
• kit for doubling wheels, etc.

K-744R3: technical characteristics

In the first modification “Standard”, the K-744R3 tractor is equipped with a V-shaped 8-cylinder turbocharged engine TMZ-8481.10-02 from the Tutaevsky Motor Plant, with a displacement of 17.24 liters and a power of 390 horsepower. The rated speed is 1900 rpm. Maximum torque – 1864N.m. Rotation speed at maximum torque – 1300…1500 rpm.

Mercedes OM460LA E3A/4

In the second “Premium” modification, K-744R3 tractors are equipped with 6-cylinder Mercedes OM460LA E3A/4 12.8-liter power units, boosted to 401 hp. The rated speed is 1800 rpm. Maximum torque – 1900 N.m. Rotation speed at maximum torque is 1300 rpm. Specific fuel consumption – 151 g/hp.h (205 g/kWh).

The operating weight of the K-744R3 tractor with a TMZ engine is 16.63 tons; with a Mercedes engine - 16.165 tons. The wheels are also equipped with larger tires of size 800/65 R32.

User reviews

Reviews from owners and people who worked on this machine are extremely positive. The power of the power unit is sufficient to operate any attachment. The engine starts easily in any weather conditions and has a long service life.

Spare parts are freely available. This eliminates long-term downtime of equipment while searching for the necessary components. The main part of possible malfunctions are minor breakdowns that can be easily repaired in the field. The price of domestic spare parts is more affordable than their foreign counterparts.

From the above it follows that the Kirovets K744 tractor is a multifunctional machine of traction class 5 - 8. Thanks to its attractive price, it is affordable in comparison with foreign analogues, and is not inferior to them in technical indicators.