Bulldozer Chetra T-11 (technical characteristics)

The Blue Stream gas pipeline, the Sakhalin-2 pipeline and other objects of increased complexity were built using equipment produced by . The production is located in the city of Cheboksary and produces heavy equipment. The main machines are tractors and bulldozers, but the range includes pipe-laying equipment for use in the forestry industry, excavators and rollers. The quality is very high, so these models are rightfully considered the best of their kind.

Tractor Chetra T-11

Navigation

• Features and Benefits
• Technical characteristics and dimensions
• Engine
• Modifications
• Device
• Operator's cabin
• Chassis
• Attachments
• Cost of new and used
• Analogs

The Chetra T-11 bulldozer is very popular among Russian consumers. Only foreign-made vehicles can compete with it, but their cost is much higher than the Chetra T-11. Another advantage is the low cost of machine maintenance.

The scope of activity of the equipment is construction work, namely loading and unloading materials, their transportation over short distances (up to 300 m). This applies to various types of waste - construction or household; bulk materials and soils. In addition to construction, the machine has found its application in oil and gas, hydraulic engineering, urban construction, road and earthmoving work, and in mining.

Features and Benefits

The climatic conditions for using the Chetra T-11 are not important, because When developing the vehicle, all weather conditions typical of Russia were taken into account. The temperature range is from -50 to +50 degrees. The design of the equipment is based on a modular system, which allows you to save on repairs. Another advantage is the fast delivery of the necessary spare parts, because Almost all of its parts are produced on the territory of the Russian Federation. This will save downtime for the Chetra T11 bulldozer.

The main functional features of the machine are its maneuverability under any working site conditions and productivity under any conditions and operating modes. In addition, the machine can easily cope with the task on frozen soils, because adapted to different climatic situations. The machine is certified in accordance with European standards.

DESCRIPTION AND PURPOSE

CHETRA T11 is a heavy crawler bulldozer of traction class 10 (manufacturer: Cheboksary). The series is the basic one in the company’s line, and German engineers took part in its creation. Development of the model started in 1999. The debut copy was shown 2 years later, after which large-scale production of the bulldozer began. In terms of demand, CHETRA T11 is considered the leader of its class on the Russian market.

The bulldozer is used for loading, unloading and moving soil, materials, and various waste over a short distance (up to 300 m). The bulldozer is used in the following areas:

• road and earthmoving works;
• construction;
• oil and gas industry;
• cleaning and removal of household waste;
• mining industry;
• road and earthmoving works of various types;
• forestry.

The series is adapted to Russian operating conditions and can be used in various climatic zones. The efficiency of the bulldozer remains at a high level at temperatures from -50 to +50 degrees.

The basic model of the series is the CHETRA T11 version with a standard ripper and hemispherical blade. The line also includes the following modifications:

• CHETRA T11M is a reclamation variation with low pressure on the surface and a hemispherical blade. Used in swampy areas;
• CHETRA T11T – model with protection and hemispherical blade. Typically used in forestry, road construction and emergency recovery work;
• CHETRA T11S – version with a direct blade and hydrostatic transmission.

All models in the series have a minimum of design differences.

Technical characteristics and dimensions

The maximum speed of movement of heavy class equipment is quite high: 11 km/h when moving forward and 14.4 km/h when moving backward.

Another characteristic of the Chetra T-11 bulldozer is fuel consumption of 278 g/kW per hour of operation, which is 202 g per horsepower per hour. At the same time, the fuel tank capacity is 300 liters.

The engine is installed with a power of 185 horsepower (YaMZ-236ND-2) or 187 (Commins QSB 6.7-C204).

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.

Be sure to read: Komatsu D355a bulldozer

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.

Engine

Three types can be installed:

1. YaMZ-236ND-2 – six-cylinder four-stroke V-shaped power unit. Produced in Yaroslavl. It is liquid cooled and has a right camber angle. This motor model is the most popular, and its cost is less than the others.

In addition, a thermostat and a fan are installed in the engine to adjust the temperature. The fuel pump can also be adjusted to set the injection timing. To cool the engine oil, a liquid-oil heat exchanger and an oil purification complex are installed. The latter can regulate the rotation speed. All these units are configured to automatically start when the temperature of the liquid in the cooling system reaches a certain value. The transmission oil is cooled by another heat exchanger. It is located in the same functional unit with the radiator block. Starting is carried out directly via the 24 V electrical system.

Important parameters of the unit are the volume of 11.15 liters and torque of 883 Nm. Cylinder diameter 13 cm.

2. Commins QSB 6.7-C204 also with four strokes and six cylinders with a diameter of 102 mm. It is turbocharged with cooler and liquid cooled. The name of the unit reflects the name of the American manufacturer.

The main characteristics of this model are:

• anti-rust cooling filter
• oil cleaning system,
• a ventilation system with a belt drive to start it and a separate heat exchanger.

All engine cylinders are arranged in a row; the engine has a volume of 6.7 liters. This is almost two times less than the previous model. Torque 938 Nm. The cost of such an engine is the highest among those installed.

3. Sisu Diesel 74 are extremely rare. Such engines are assembled in accordance with Finnish designs in Vladimir.

Engine, power:

Modifications

Among the modifications of the Chetra T-11, the following models can be distinguished: Chetra T-11T, Chetra T-11S Chetra T-11M.

SPECIFICATIONS

Overall dimensions (CHETRA T11):

• length with basic equipment – ​​6588 mm;
• width – 3260 mm;
• height – 3412 mm;
• track base - 2616 mm;
• ground clearance - 510 mm.

The operating weight of the bulldozer (YaMZ engine/Cummins unit) is 20,785/19,975 kg. The specific ground pressure with standard shoes is 0.78 kg/sq.cm.

Front Attachment Specifications

(hemispherical blade/straight blade):

• length – 3320/4060 mm;
• height – 1625/1155 mm;
• maximum lowering depth – 550/550 mm;
• maximum lifting height – 1100/1000 mm;
• capacity – 5.6/4.3 cubic meters.

Some versions are equipped with a hemispherical blade with a length of 3311 mm and a width of 1462 mm.

Rippers with the following parameters are offered as rear attachments:

• number of teeth – 1/3;
• lifting height – 540/500 mm;
• maximum loosening depth – 630/530 mm.

Device

The gearbox is planetary, which can shift under load. The number of gears is six: three rear and three forward. The functional unit, including the gearbox itself, the main gear and the gearbox, is located in the bore, which in turn is located in the rear axle.

Bulldozer Chetra T-11

Heavy-duty special equipment is manufactured at the Promtractor enterprise. The tractor is actively used to discover new fields, as well as when laying a gas pipeline. In cold and frosty conditions, equipment works at the edge of its capabilities and shows itself from all sides. The advantages include:

1. Pre-heating of the engine, heating in the cabin, imported filters - all these are necessary spare parts and components for the full operation of the unit in northern conditions.
2. YaMZ and Commins are the best diesel engines.
3. Thoughtful conditions for being in the operator's cabin.

Bulldozer with a single cabin, with noise absorption. The use of rubber shock absorbers allows the level of noise and vibration to be reduced to a minimum. Double glazing in the cabin allows you to retain heat from the heating and cold from the air conditioning, depending on weather conditions. With such comfort, doing work will be much more pleasant.

The bulldozer has decent technical characteristics

Ergonomics and accessibility are the main features of bulldozer control. Control is carried out using a pedal, which fixes the intensity of rotation of the crankshaft. To change gear, a lever is used.

Bulldozer device

The production uses a planetary gearbox, which allows the use of three rear and the same number of forward gears.

The productivity of the unit was increased due to better controllability and maneuverability of the equipment. The German company took on the development of the transmission. Main components: 2 high-pressure piston pumps, the same number of piston adjustable hydraulic motors, control unit. This approach allows you to solve several problems at once:

1. Optimize command execution.
2. Synchronize linear movement.
3. Operate the unit in operating braking mode.
4. Select one of the modes: turn, stop, move.

The transmission and engine are in perfect interaction, which can be felt by every tractor operator.

Operator's cabin

T11 bulldozer cabin

The cabin upholstery performs a soundproofing function, and rubber shock absorbers also reduce vibration levels. The seat itself also has a vibration-isolating base. The glazing is double, which expands the operator's viewing angle. In addition, the cabin is equipped with a heating system and air conditioning. There is also an additional heating element.

Chetra T-11. Side view

The pedal for controlling the Chetra T-11 can be fixed in the required position for a certain number of rotation speeds. Gears are changed using a lever. The controls are located in such a way that it is convenient for the driver to operate them.

Chassis

The gearbox includes clutches in an oil environment. They perform a transfer function.

The torque converter is a three-element, single-stage one, which includes a gearbox. The latter, in turn, drives the pumps. Its connection to the gearbox is made through a coupling, and its location is on the rear axle. The connection to the motor occurs through a cardan transmission. The coupling is also involved in this process.

Onboard clutches are used to control braking . They are couplings. They work using hydraulics. The parking brake operates on the same principle. Cooling occurs through oil, and adjustments and adjustments are not necessary for the entire period of operation.

The two stages of the final drive are gears and a planetary type transmission. If repairs are necessary, it can be replaced quite easily due to simple fastening.

High traction forces are provided by installing a semi-rigid suspension. The same applies to coupling with the base, reducing the influence of mechanical and dynamic influences. The rollers are lubricated once at the factory and do not require any further intervention. The guide wheels behave the same way. The seals are installed “double cone”.

The tracks are made up of separate parts and contain sealing elements to maintain lubricant levels. A syringe is used to adjust their tension.

Chetra T-11 tracks

The performance of the Chetra T-11 tractor is influenced by the quality of control and maneuverability of the machine, taking into account its ability to maneuver. A whole set of elements affects the controllability of a vehicle.

The Chetra T-11 transmission consists of several units: a control controller, hydraulic pumps, joysticks and hydraulic motors. It is produced in Germany and supplied directly to the factory. The transmission also includes a gearbox and final drives. Here the fuel supply is adjusted, which allows it to be spent rationally.

The transmission guarantees:

• operating mode control;
• adjusting the engine operating mode when stopping the equipment;
• rational operation of the motor;
• maintaining speed differences without taking into account the vehicle load;
• ensures safety in unexpected situations;
• when moving along one straight line, it corrects it.

CHETRA T11 DEVICE

CHETRA T11 is characterized by a feature inherent in most products of the brand - modular design. Thanks to this, maintenance and repair of equipment is completed faster.

The chassis is based on a 3-point semi-rigid suspension. It uses double cone seals and lifetime lubrication. The idler wheels and rollers are lubricated during assembly at the factory and do not require subsequent maintenance. Prefabricated tracks include several parts and special elements that control the level of lubrication. The tension is adjusted using a syringe.

Chassis parameters:

• number of shoes – 39;
• number of road wheels – 6;
• number of support rollers – 2;
• base shoe width – 510 mm;
• chain link pitch – 203 mm;
• lug height – 65 mm;
• Contact area of ​​the track chain with the ground is 2,668 sq.m.

CHETRA T11 is equipped with a German Sauer Danfoss hydrostatic transmission with 2 hydraulic pumps, 2 hydraulic motors and a control controller. The planetary gearbox shifts under pressure and has 6 speeds. The gearbox, gearbox and main gear are represented by one functional unit mounted in the rear axle bore.

Travel speed range (forward/reverse):

• 1st gear – 0-3.7/0-5 km/h;
• 2nd gear – 0-6.8/0-9 km/h;
• 3rd gear – 0-11/0-14.4 km/h.

The bulldozer is braked using onboard clutches (clutches operating hydraulically). The parking brake has a similar principle of operation. The separate-unit hydraulic system consists of a S1A6097 David Brown gear pump (power - 163 l/min), a safety valve (maximum pressure - 20 MPa), a 4-section Bosch Rexroth distributor and a hydraulic tank (capacity - 85 l).

The CHETRA T11 cabin is installed on rubber shock absorbers, which reduce vibration levels. The cabin has a heater and double glazing, and special upholstery absorbs all noise effects. Air conditioning and additional heating are available as options. The driver's seat with a sprung design has settings taking into account weight and height.