Wheel tractors: Bulldozer TK-25.02

ENGINE

At the request of the customer, this model can be supplied with different engine models.

YaMZ-236ND-2 136 kW (185 hp),

QSB 6.7-C204 137 kW (187 hp)

TRANSMISSION

Planetary power shift transmission with 345 mm diameter oil-fed clutches with high torque transmission capability, providing three forward and three reverse gears. Structurally, it is combined with a matching gearbox and main gear into a single power unit installed in the bore of the rear axle. A three-element, single-stage torque converter with an active diameter of 390 mm, a maximum transformation ratio Ko = 2.539 with a pump drive gearbox, connected to the gearbox with a splined clutch, installed on the front wall of the rear axle. The torque converter is connected to the engine through a cardan transmission and an elastic coupling mounted on the engine

The traction force depends on the weight of the tractor and the traction force.

CHASSIS

Suspension: three-point semi-rigid with a remote swing axis of the bogies provides high traction properties, reduced shock loads on the chassis system, and improved working conditions. Support, support rollers and idler wheels with one-time lubrication for the entire service life with self-clamping “double cone” seals.

Number of support rollers (on each side) - 6 Number of support rollers (on each side) - 2

Caterpillars:

prefabricated with one lug and a seal to hold liquid lubricant in the hinge. Track tension is easily adjusted with a grease gun.

Link pitch - 203 mm Number of shoes (on each side) - 39 Height of lugs - 65 mm Shoe width - 510 mm Base - 2616 mm Support surface area - 2.668 m2 Ground pressure - 0.76 / 0.75 kgf/cm2

Specifications

Technical characteristics of the bulldozer Chetra T-11:

WORKPLACE

The CHETRA T11 tractor has a single-seat, double-glazed cabin that provides maximum visibility of equipment and work areas, regardless of the ambient temperature, equipped with a ventilation system and a dependent-action heater, as well as a vibration-proof seat and noise-absorbing upholstery. Additional heating and air conditioning are available upon request. The controls satisfy ergonomic requirements and are easy to operate and reach. The diesel engine is controlled by a pedal fixed at the selected crankshaft speed. Shifting gears and changing the direction of movement is carried out by one lever, the onboard clutches are controlled by two levers, and an emergency stop is provided by pressing the brake pedal. The bulldozer and ripper are controlled by separate levers. All control is carried out from the driver's seat, which allows him to work without fatigue during the work shift.

Bulldozer Chetra T-11

Bulldozers of the Chetra T-11 brand are produced in (Chuvashia, Cheboksary), which produces pipe layers, tracked and wheeled bulldozers, and loaders. This is the only plant in the territory of the CIS countries, which is one of the four world leading manufacturers of heavy-duty bulldozer-ripper equipment.

The bulldozer marked Chetra T-11 is the full-fledged founder of the Chetra brand, on the basis of which almost all Promtractor model lines are built. The main purposes of this technology are the following areas:

• Transportation work with soil.
• Moving construction materials.
• Cleaning up construction or household waste.

These machines are indispensable in earthmoving work that requires large capacities - in oil and gas construction, road work, mining and hydraulic engineering.

Photo of the Chetra T-11 bulldozer

The great advantage of the Chetra T-11 is the possibility of its operation in any weather and climatic conditions of all latitudes of Russia, since the operating temperature range for it is from -50 to +50 0C. In addition, it has very high maneuverability and the ability to work even with frozen soil.

The history of the creation of the Chetra T-11 bulldozer

The decision to build a new, large tractor plant was made in 1971, and in January 1972 its construction began. Simultaneously with the construction, recruitment was underway for the team of tractor builders of the new enterprise, the Cheboksary Industrial Tractor Plant or ChZTP.

Experienced specialists from such enterprises as ChTZ, PTZ, VgTZ, etc. were invited to lead positions. In the same 1972, recruitment began for ordinary positions, and young people from different parts of the country flocked to the new enterprise.

In December 1974, the first workshop of the plant began operating; components for the first tractor were manufactured on its premises. In 1975, on October 25, the technical control department accepted the first bulldozer of the ChZPT brand, a heavy T-330 with a power of 330 hp. This day is considered to be the birthday of the enterprise. In September 1982, the anniversary, 1000th tractor T-330 was manufactured.

Bulldozer T-330. In 1985, the development of a line of new industrial machines of 50, 35 and 25 tons was ready. The first three T-25.01 bulldozers with a planetary gearbox were built. On its basis, a reclamation machine and a modification for pipe laying were created.

At the end of 1993, ChZPT was privatized and transformed into Promtractor OJSC.

In 1995, the T-35 and T-25 tractors went into production; these machines were equipped with YaMZ diesel engines. Work on bulldozers with a power of 240 and 280 hp, called T-15 and T-20, began in 1996.

We recommend reading: Tractor MTZ-3522 – functional and productive for carrying out work of increased complexity

The T-20 was assembled first in the winter of 1997, and in October 1999 the first production T-15 was assembled. In the same 1999, the design of the T-11 began, it weighed 19 tons and the power reached 180 hp. The first T-11 bulldozer was manufactured in 2001, Sberbank took part in this project as an investor, and its mass production was launched in the same year.

In 2002, at the Tractor Show, where new tractor models were demonstrated, Promtractor OJSC for the first time presented to the public its products under the CHETRA brand. In June 2005, the company became part of the Tractor Plants LLC concern.

Technical characteristics of Chetra T-11

“Chetra” is designed to work in difficult climatic conditions and can withstand any temperature changes from –50 to +50 degrees. Fuel consumption for such massive equipment is 278 g/kW. at one o'clock. In this case, the tank is designed for 300 liters. The maximum possible speed in reverse is 15.1 km/h, forward – 11.6 km/h.

The weight of the tractor is 20.8 tons, with this mass it presses on the ground 0.78 kgf/sq.cm. The technical characteristics of the Chetra T11 bulldozer make it possible to carry out work on frozen soils. The performance and adaptability of the unit is amazing. The model has been certified according to EU requirements.

Engine parameters

Consumers can choose from several engines with which the tractor is equipped: YaMZ-236ND-2, Cummins QSB 6.7-C204 and Sisu Diesel 74.

YaMZ-236ND-2 is manufactured at the engine plant in Yaroslav. The camber angle is 90 degrees and is liquid cooled.

A bulldozer performs work on the extraction of new deposits

Equipment with such a motor will be cheaper and has the following characteristics:

1. A liquid-oil heat exchanger that is used to cool the engine.
2. Fuel pump to control injection timing.
3. Foreign filters for oil purification.

Each element is switched on automatically, taking into account the actual cooling temperature.

Cummins QSB 6.7-C204 with in-line cylinders. This modification will be more expensive. Motor characteristics:

1. Volume 6.7 liters.
2. Power 137.5 kW.

Sisu Diesel 74 is the least common and is assembled using technology from Finland.

Catalog of spare parts for bulldozer Chetra T-11

The modular use of components allows for complete repairs at minimal cost. Each element is easily transported, leaving a multi-ton vehicle on site, it will be possible to transport spare parts and make replacements there.

The catalog allows you to replace any element: transmission, electrical equipment, chassis, attachments, controls. An expanded catalog allows you to select suitable parts and also become familiar with the design, which simplifies the replacement process.

Chetra T-11 outperforms many competitors; even foreign analogues cannot compare in technical components. Domestic manufacturers have finally paid special attention to operator comfort. When creating equipment, modern developments and design solutions are used. There are also minor shortages. The first problems with hydraulics arise after 2-3 thousand hours or with the transmission. Experts are already working to eliminate the shortcomings. Otherwise, you will be pleased with the technical characteristics and performance of the equipment. The cost of such a unit is 4-7 million rubles, depending on the model and year of manufacture; it will be cheaper on the secondary market. The Chetra T-11 is designed for work in difficult conditions, the investment will be worth it.

Chassis of the bulldozer Chetra T-11

Suspension:

Three-point semi-rigid bogies with a remote swing axis provide high traction and grip properties, reduce shock loads on the chassis system, and improve working conditions. Support, support rollers and idler wheels with one-time lubrication for the entire service life with self-clamping “double cone” seals.

• Number of road wheels (on each side) - 6;
• The number of support rollers (on each side) is 2.

Caterpillars:

Prefabricated with one lug and a seal to hold liquid lubricant in the joint. Track tension is easily adjusted with a grease gun.

• Link pitch - 203 mm;
• Number of shoes (on each side) - 39;
• The height of the lugs is 65 mm;
• Shoe width - 510 mm;
• Base - 2616 mm;
• Supporting surface area - 2.668 m2;
• Ground pressure - 0.76 / 0.75 kgf/cm2..

Hydraulics and attachments for the Chetra T-11 bulldozer

The separate-module system of the T-11 bulldozer includes:

• The S1A6097 gear pump produces a capacity of 163 l/min at an engine speed of 1800 rpm. ;
• Four-section distributor from , three working sections, one valve;
• The safety valve operates at pressures above 200 MPa;
• Welded hydraulic tank, capacity 85 l;
• Hydraulic cylinders 5 pcs. 2 for raising and lowering the blade, 1 for turning the blade left and right, 2 for raising and lowering the ripper.

Bulldozer equipment.

A large-capacity hemispherical blade provides the T-11 bulldozer with high performance. The use of diagonal traction when transferring lateral loads from the blade to the left spar of the bulldozer provides the greatest proximity of the blade to the hood and the greatest support force on the blade blade.

We recommend reading: MTZ tractors: model range

Ripper.

Depending on the required productivity, CHETRA bulldozers are equipped with rippers with one tooth, as well as with three or two teeth.

• Type of ripper – multi-shank/non-adjustable;
• Number of teeth – 3/1;
• Depth – 640/530 mm;
• Penetration force – 6.14/5.7 t;
• Pull-out force – 17.15/16 t.

Gearbox of the bulldozer Chetra T-11

Planetary power shift transmission with 345 mm diameter oil-fed clutches with high torque transmission capability, providing three forward and three reverse gears. Structurally, it is combined with a matching gearbox and main gear into a single power unit installed in the bore of the rear axle. A three-element, single-stage torque converter with an active diameter of 390 mm, a maximum transformation ratio Ko = 2.539 with a pump drive gearbox, connected to the gearbox with a splined clutch, installed on the front wall of the rear axle. The torque converter is connected to the engine through a cardan drive and an elastic coupling mounted on the engine.

The traction force depends on the weight of the tractor and the traction force.

Side clutches are multi-plate clutches that are hydraulically actuated. Stopping brakes are multi-disc clutches that are permanently closed by spring force. The side clutches and brakes are cooled by oil under pressure and do not require adjustment during their entire service life.

The final drive is two-stage, the 1st stage is external gears, the 2nd stage is planetary according to the “k+1” scheme (with a stopped ring gear). To facilitate easy replacement in the field, the drive sprocket is made of five sectors, which are secured with bolts.

Technical characteristics of the bulldozer CHETRA T-11 / T-11M

ENGINE

There are 2 power plant options available for CHETRA TK25:

• YaMZ–850.10-01;
• Cummins KTA 19-C510.

YaMZ-850.10-01 is a 4-stroke diesel unit with a liquid cooling system and turbocharging from the Yaroslavl Motor Plant. A liquid-oil heat exchanger is used to cool the oil. Thermal control is carried out using a push-type fan driven through a friction clutch and a thermostat. Oil purification is carried out using a system with a centrifugal filter and 3 replaceable paper elements. The engine has 12 cylinders arranged in a V-shape (camber angle - 90 degrees).

Characteristics of the YaMZ-850.10-01 unit:

• working volume – 25.86 l;
• operating power – 382 (520) kW (hp);
• maximum torque – 2450 Nm;
• specific fuel consumption – 238 (175) g/kW per hour (g/hp per hour);
• cylinder diameter – 140 mm.

The Cummins KTA 19-C510 diesel engine has a smaller volume and longer service life. The fuel system is represented by a direct injection pump. The design of the unit involves 6 in-line cylinders and a turbocharged intercooler.

Characteristics of the Cummins KTA 19-C510 engine:

• working volume – 18.9 l;
• rated power – 353 (480) kW (hp).