Let's start the review of the DT-75 caterpillar tractor with information about its manufacturer. It was the Volgograd Tractor Plant, which launched mass production of DT-75 general-purpose tracked tractors in 1963. This is the most popular tractor in the USSR, which has gained immense popularity due to its excellent traction and performance characteristics. A distinctive feature of this tractor is ease of operation, the possibility of carrying out repair work, the availability of spare parts and components, and an affordable price. A little later, since 1968, serial production of modernized DT-75M tracked tractors was launched at the Pavlodar Tractor Plant in Kazakhstan.

This heavy agricultural machinery has proven its versatility over the entire period of its existence, performing various road, agricultural and construction work with various equipment.

Overview of the range

Technology does not stand still, so the modernization also affected this general-purpose equipment. Manufacturers have released the following improved modifications of the DT-75 tractor:

• DT-75N
• DT-75B
• DT-75M
• DT-75K
• DT-75S
• DT-75D
• DT-75T
• DT-75DE
• DT-75RM
• DT-75ML
• DT-75DM
• TDT-75
• VT-90
• Agromash-90TG

Let us consider in more detail the most popular modifications of the Soviet caterpillar tractor. We offer to compare the technical data of these models.

DT-75B

The photo shows the DT-75B, which received the name "swamp". This swamp tractor is equipped with a SMD-14NG diesel engine.

The productive capacity is 80 liters. With. Design features of the model:

• the caterpillar is expanded;
• there is protection of the power plant;
• protective transmission tray.

The purpose of the model is to work in wetlands, on peat bogs, in conditions of high humidity and with viscous soil.

Characteristics

Tractor type	caterpillar, swamp
	3000
Tractor weight, kg	7130
Specific metal consumption, kg/hp	95
Number of gears, forward/reverse	7/1
Engine brand	SMD-14
engine's type
Rated power, h.p.	75
	195
cylinder diameter, mm	120
Piston stroke, mm	140
Working volume of cylinders, l	6,33
Engine weight, kg	675
Fuel tank capacity, l	245
Engine start	PD-10M-2 with electric starter

DT-75K

These tractors are often used in the mining industry, as they are equipped with a special system that prevents the tractor from tipping over, even when working on slopes with a slope of 20 degrees.

The built-in roll indicator accurately determined and showed the driver the position of the car in space. A diesel engine SMD-14MG is installed on the tractor machine. A special feature of the cabin are its seats, located one opposite the other.

Characteristics

Tractor type	caterpillar, steep slope
Rated pulling force, kgf	3000
Tractor constructive weight, kg	7700
Number of gears: forward / reverse	7/7
Base, mm	2365
Ground clearance, mm	326
Specific pressure on the soil, kgf/cm2	0,41
Engine brand	SMD-14 (later SMD-14NG)
engine's type	4-cylinder, four-stroke
Rated power, h.p.	75
Torque margin, %	15
Specific fuel consumption, g/e. l. With. h.	195
Cylinder diameter, mm	120
Piston stroke, mm	140
Working volume of cylinders, l	6,33
Engine weight, kg	675
Fuel tank capacity, l	245
Engine start	PD-10M with electric starter

DT-75S

This model is equipped with a heavy-duty six-cylinder turbocharged diesel engine SMD-66 with a capacity of 170 hp. With.

The design also contains a built-in resistance torque converter, allowing the tractor to perform heavy agricultural and road work, transforming into a bulldozer.

Characteristics

	125,0 (170)
Rotation frequency, rpm:
- crankshaft	1900
-PTO	504 and 1000
Cylinder diameter, mm	130
Piston stroke, mm	115
	251,6 (185)
	360
Track, mm	1330
Longitudinal base, mm	1700
Ground clearance, mm	335
Shoe width, mm	500
Overall dimensions, mm:
-length	5193
-width	2475
-height	3085
Structural weight, kg	7450

DT-75M

The tractor received a more efficient A-41 power plant with a capacity of 90 hp. with., which required the installation of a more capacious fuel tank of 315 liters.

The cab was enlarged and moved to the right, and the fuel tank was installed on the left. This design is popularly called the "postman". The weight of this model is 6640-7210 kg.

Characteristics

Rated engine power, kW (hp)	66,2 (90)
Rotation frequency, rpm:
- crankshaft	1750
-PTO	540 and 1000
Cylinder diameter, mm	130
Piston stroke, mm	140
Specific fuel consumption, g/kW*h (g/e. hp-h)	251,5 (185)
Fuel tank capacity, l	315
Track, mm	1330
Longitudinal base, mm	1612
Track link width, mm	390
Overall dimensions, mm:
-length	3480
-width	1890
-height	2650
Structural weight, kg	6550

DT-75N

This unit was put into production in 1984. Its weight was 6330-6900kg.

The tractor is equipped with a four-cylinder SMD-18N engine with a capacity of 95 hp. With. Otherwise, this model is completely unified with the previous modification DT-75M.

Characteristics

Rated engine power, kW (hp)	70,0 (95)
Rotation frequency, rpm:
- crankshaft	1800
-PTO	540 and 1000
Cylinder diameter, mm	120
Piston stroke, mm	140
Specific fuel consumption, g/kW*h (g/e. hp-h)	251,6 (185)
Fuel tank capacity, l	315
Track, mm	1330
Longitudinal base, mm	1612
Ground clearancemm	376
Track link width, mm	390
Overall dimensions, mm:
-length	3480
-width	1890
-height	2650
Structural weight, kg	6490

DT-75D

How much does a DT-75D tractor with an A-41I diesel engine weigh? The operating weight of the unit is 6295 kg, of which only the engine weight is 960 kg. The performance of the power plant is 94 liters. With. This is a universal modification suitable for all types of agricultural and other work.

Characteristics

DT-75ML

The production of this model began in 1986 and the tractor was produced at the Pavlodar Tractor Plant.

The cab was again enlarged from 230.4 cm to 292.3 cm. The lining of the engine compartment was also changed. PTZ also conducted experiments on the production of wheeled tractors DT-75 ML.

Characteristics

TDT-75

The TTD model is intended for skidding of tree trunks, their loading and unloading, as well as their dragging (partial or complete) in off-road conditions.

Wide tracks, powerful power plant mounted in the cab, universal chassis, metal underbody protection, 5-speed gearbox forward and reverse.

Characteristics

Tractor type	skidder
Tractor weight, t	11
Number of gears, forward/reverse	5/1
Traction class	3
Track at the edges of the track	1.91 m
Base, m	2,72
Overall dimensions, m	5,50*2,37*2,7
Fuel tank volume, l	315
Refueling, l	110
Specific fuel consumption, hp/h	205
Specific pressure on the soil, kgf	0,42
Engine brand	D-75T-AT
Rated power, h.p.	75
Motor weight	1150kg

Agromash-90TG

This is a modern modernization of the popular caterpillar DT-75. The cab has become more spacious, electric sensors have come to replace the levers.

The car received a more productive power plant:

• A-41SI-02 with a capacity of 95 liters. With. from the Altai TZ;
• Sisu 44-DTA, 94 HP With.;
• D-245.5S2 with a capacity of 110 liters. s from the Minsk Tractor Plant.

The fuel tank is again installed behind the cab, and hydraulic distributors are also installed here. A second door appeared, the hood is made of fiberglass. The cost of the tractor, depending on the modification, varies from 21,000 to 24,000 dollars.

Characteristics

Traction class of the tractor	3,0
Engine model	A-41SI-02
Operating power hp	94+8,2
Rated frequency of rotation of the crankshaft of the engine, rpm	1750
Working volume, l	7,43
Number of cylinders, pcs	4
Specific fuel consumption, g/kW.h (g/hp.h),	245(180)
Number of gears: forward/reverse	7*1
Rear PTO, rpm	540
Rated traction force (on the stubble), kN:	34
Hydraulic system	Separate-aggregate
Load capacity, kg	1800
Maximum fluid pressure kgf/cm2	180-200
Ground clearance, mm, not less	370
Track width, mm	steel, 390
Length, mm	4700 / 4240
Width, mm	1850
Height, mm	2990 (2700)
Weight, kg:	6070-7250
Average pressure on the soil, kPa	50

Device

Universal tracked vehicles DT-75 belong to the third traction class and are characterized by high design reliability. Initially, four-cylinder SMD-14 engines with a capacity of 75 liters were installed on the DT-75. With. A powerful frame structure is welded from spars (2 pcs), united by strong pipes.

The following elements were installed on this heavy-duty structure:

• suspension;
• roller mechanism;
• guide roller blocks;
• blocks of driving rollers;
• caterpillar carts.

Transmission

The transmission of the tracked vehicle includes:

• Gearbox four-way, providing 7 forward speeds and reverse;
• floating brake system of tape type;
• double disc clutch.

To further increase the traction characteristics of the DT-75 tractor and the torque, the following additions were made by the designers:

• creeper;
• gearbox (planetary type) ;
• reverse gear.

These additions made it possible to use a tractor with caterpillars as a bulldozer with an attached blade (shovel).

The tractor is equipped with a power take-off shaft, thanks to which the machine turns into a universal device with various functional target units.

The drive for the PTO can be a planetary gearbox or a speed reducer enclosed in a single transmission housing.

Aggregation with attachments occurs due to the following systems and mechanisms:

• rear hitch;
• trailer mechanism;
• hydraulic system.

In addition, a caterpillar tractor can also be aggregated with target units of a side-mounted semi-mounted type.

Cabin

The pressurized cabin for two places is mounted on springs. The driver's seat is adjustable. Inside the cabin, ventilation and a stove are built in. The cab of the DT-75 tractors of the second generation has been improved. Its dimensions and viewing angle have increased, a slight asymmetry has appeared, which made it possible to install a more capacious and capacious fuel tank outside near the side of the cab.

The people of the tractor DT-75 were called "postmen".

The DT-75M "postman" tractor did not immediately take root, farmers had to get used to its enlarged asymmetric cab, which was not always convenient when plowing waters with tree crowns.

The machine is controlled by lever, directly from the cab. Starting the motor from an electric starter, models designed for operation at low temperatures are additionally equipped with a manual starter.

Attachment

The presence of a PTO and a hitch provides for the possibility of connecting active attachments: milling cutters, cultivators, harrows, blades and many other units that increase the functionality of tractors. So, by attaching a plow, it is possible to effectively plow large land plots of varying complexity.

cutter
snow blower
Rotary mower


Rake
Disc harrow

User manual

To increase the motor resource of the machine, it is necessary:

• Break in the engine properly.
• Timely carry out technical inspection and subsequent maintenance of the unit.
• Examine the possible causes of malfunctions, described in detail in the instructions.
• Conservation.

First run, run-in

This procedure lasts 8-10 hours. The engine warms up and runs without load for the first few hours. All systems, transmissions, etc. are checked. Gradually, the loads increase and are brought up to ¾ of the power of the power plant. At the end of the run-in, the oil must be changed.

Maintenance

The instructions contain a table for a scheduled inspection of a caterpillar tractor (according to the hours worked), which includes an oil change. This procedure begins with warming up the engine. The oil heats up slightly and circulates through the system more easily. When the oil is drained, you need to drain and work out. Then the filters and centrifugal cleaner are cleaned.

The following grades of motor oils are used for DT-75 tractors:

• M-10DM;
• M-10G2k.

Checking the hydraulic system requires checking the oil pressure. Pressure less than 1 kgf/cm3 requires cleaning the filters and adding oil. If it has risen to the level of 2.5 kgf / cm2 or more, it is necessary to wash the filters with the obligatory draining of the oil.

Transmission oil TAP-15V

The hydraulic oils of the following grades are used for the hydraulic system:

• 15W-40;
• TAP-15v.

Main malfunctions and ways to eliminate them

Knowing the causes of malfunctions and ways to eliminate them, the operator of the DT-75 caterpillar tractor can independently repair his unit.

Motor does not start:

• fuel is missing or does not match the quality;
• compression in the cylinder caused by wear of the compression rings;
• the oil has run out or is of poor quality;
• HPFP requires cleaning;
• filters are clogged.

The hydraulic system does not work:

• lack of oil in the hydraulic system;
• the hydraulic pump is turned off;
• the safety valve is clogged.

The brake system does not work:

• brake pad wear;
• brake disc wear;
• bearing or gear adjustment required.

Video review

Overview of the launch of the tractor DT-75

Overview of snow removal by tractor Agromash-90TG

Overview of plowing with a five-furrow plow tractor DT-75

DT75 is produced by a famous tractor plant located in Volgograd. As soon as the tractor was launched into serial production, a large number of various restylings, as well as various upgrades, were quickly developed.

Enterprise professionals constantly working on the overall improvement of the quality of technology, its technical and optimal performance, as well as constantly increasing the comfort of the bulldozer. As a result, the consumer receives a product that is characterized by a large number of advantages.

Among them are the ideal characteristics of the equipment, the ideal operating potential, very high throughput rates, economical fuel consumption, as well as the optimal dimensions of the machine.

Bulldozer of this brand characterized enough wide scope. The equipment is used at numerous construction and repair sites, in the agricultural sector.

Tractor can be used on slopes slight steepness, if the angle of inclination does not exceed the indicator 20 degrees.

Optimal patency of the device allows it to be used in the swamp and off-road. If you install special attachments, you can run the bulldozer on snow removal. Most construction companies purchase equipment for excavation of soil, as well as for the purpose of carrying out the loading and unloading work processes necessary in construction.

The use of a variety of attachments allows the machine to be used in even more areas and areas.

Numerous components and mechanisms of the tractor are mounted on a solid welded frame, which consists of two longitudinal spars. Each of them has a special rectangular section, and everything is connected by cross-links. All this makes the process of plowing, snow retention, sowing and harvesting crops the highest quality.

Specifications
bulldozer dt 75

The bulldozers of this manufacturer are distinguished by ideal technical characteristics, which ensures their unpretentiousness, as well as high rates of maintainability.

How much DT 75 weighs can be found in the table below. The main characteristics also include the following parameters (weight and dimensions of the bulldozer dt 75):

Fuel consumption under normal operating conditions is approx. 195 g/hp.h. The dimensions of the equipment make it as convenient as possible in the process of carrying out all the necessary work.

The modern model, despite the long-standing brand, is distinguished by fundamentally new indicators - DT 75 power reaches 100 hp.

Information about the device of the bulldozer

The bulldozer is characterized by ideal structural data, which makes it possible minimize the total level of produced working pressure, which is in the hydraulic system. Each structural detail of the machine is worth considering in more detail.

Engine DT 75

The equipment is equipped with a reliable four-stroke engine. The level of his nominal power stays on average at about 95 HP The manufacturer purchases all components of the power device in Finland.

A distinctive feature of the engines is Availability special preheating, which greatly facilitates the start-up of all equipment as a whole.

Transmission

The transmission is a multi-speed gearbox that works with 10 different speeds. Thanks to this, you can easily operate the bulldozer in different conditions. Such a high-quality transmission, which works in tandem with the engine, makes it possible to minimize the total amount of fuel consumed.

Cabin

Manufacturers did a great job on the cabin of this equipment. She excels at perfection soundproofing, as it turned out to achieve the optimal tightness numerous connections. The operator inside the cabin is comfortable and convenient to work, and in different seasons. The cabin is equipped with a function of comfortable heating and cooling. All devices and numerous mechanisms are located in full accordance with the established requirements.

Chassis

The running system is characterized by high elasticity. She is unified with the DT-54 model. Various additional springs have been introduced into the suspension of the equipment, which reduce the trim of the machine.

Fuel system

Fuel tank capacity machines are approximately 300 liters. Considering that the bulldozer consumes a lot of fuel during operation due to the high engine power, the tank volume is ideal.

Modifications

The modern and functional bulldozer is offered in four main modifications − C1, C2, C3 and C4. The first differs in that it uses standard hydraulic system units, special remote cylinders, as well as a rear linkage. The functional modification C4 has a complete set similar in composition, but there is no remote cylinder, and the model C2 equipped with a special high-quality distributor, as well as a hydraulic tank.

Attached quality equipment options

A variety of attachments can be installed on this bulldozer. It all depends on the goals set, as well as on the general features of the work.

There are parts that apply to apply in agriculture, for clearing snow. A stationary or a special swivel blade can be used as an attached functional equipment.

The bulldozer of this brand guarantees complete safety and reliability of the used attachments and the running system as a whole.

Repair and maintainability

None problems with the supply of spare parts usually does not exist, respectively, the cost of professional maintenance, as well as repairs will be completely minimized.

Prices for bulldozers DT 75

The price of a new bulldozer fluctuates on average from 1,400 to 1,700 thousand rubles. It all depends on the overall configuration of the equipment. Used cars are a little cheaper, but it's even more profitable to take equipment for rent.

The cost per hour is approximately 3-5 000 rubles. For one-time jobs, this is the best option.

Analogues

Based on this model, the DT-75N tractor is produced. It is equipped with special mounted trailers. The model in agriculture is also used in the implementation of transport operations. Another analogue is the DT-75D model. It is used for high-quality harvesting of various agricultural crops, for sowing and plowing. Such a machine is distinguished by the complete absence of unpleasant slipping, that is, ideal cross-country ability.

Photo bulldozer DT75

Below are photos of the bulldozer in various technical conditions.

Conclusion

Caterpillar tractor category DT-75 is different ideal operational specifications. Users note the ease of operation and the optimal advantageous efficiency of the equipment.

Video about DT 75

In the video you can see the bulldozer in operation, as well as evaluate its maneuverability:

In contact with

The equipment in question first rolled off the assembly line back in 1984. He worked in agriculture and belonged to the equipment of the 3rd traction class. This is the legendary tractor DT 75, which could perform work with mounted or semi-mounted equipment. Plowing, cultivation, sowing, harvesting crops - this is not a complete list of its capabilities.

Get acquainted with the technique in detail and find out what technical characteristics of the DT 75 this article will help.

About power units

There are several types of tractors. Depending on this, power units are installed. Consider the options for installing motors:

1. DT-75N with SMD-18N diesel power unit. This configuration is made to special order.
2. DT-75D with A-41 (D-440-22) power unit.
3. DT-75RM with RM-120 diesel.

Use of DT-75

Today, the DT 75 tractor photo, which you can see in the article below, works not only in agriculture. It is used in road construction. Performs tasks in the field of land reclamation. On its basis, a special version has been created that can work in swamps and peat bogs.

The designers tried to improve the working conditions of the operator as much as possible by equipping the cabin with an air cooler and a heating system for comfortable work in cold weather. They also worked on reducing noise in the cab by sealing it and reducing vibration processes during movement. A sprung adjustable seat was made for the tractor driver. Tractor DT 75 video, which is posted on the Internet, is equipped with a windshield wiper to improve visibility and the ability to work in rainy weather. The washer was placed on the front glass.

Problems, Causes and Troubleshooting

Caterpillar tractor DT 75 reviews, which are mostly positive, like any other technique can hurt. The table shows the main problems that are most often encountered during its operation. Possible causes of problems and solutions are indicated. Of course, the table does not list all the possible causes of the unstable operation of the diesel "assistant", but it is these malfunctions that occur most often.

Traditionally, it is necessary to pay attention to the operation of the power unit and the condition of the hydraulics of the DT 75 bulldozer tractor. Especially when working with attachments, which increase the load on the main components of tracked vehicles.

Repair work to eliminate technical problems

Problem	Cause	Remedy
Power unit does not start	There may be a problem with the cylinder. Little compression. Possibly bad piston rings.	In this situation, they need to be replaced.
Engine not working properly. Interruptions in work	Possibly a stuck injector needle.	It needs replacement. If there is no positive result, you need to check for a high pressure pipe
Little compression in pressure cylinders	A possible cause may be natural wear or the occurrence of rings.	In this case, radical measures are necessary: ​​replacement of worn out piston rings
If the power unit is running and smoke from the exhaust pipe	Most likely a piston ring issue.	Replace
If a strong metallic sound is heard at the bottom of the crankcase	There is a possibility that the connecting rod or main bearings have melted.	To restore the working situation, you need to replace the connecting rod or main bearings
If the pressure gauge shows data below the permissible mark or it is clear that there is no oil pressure at all	The reason may lie in the drain valve spring	In this case, it must be replaced. The problem may be in the oil pressure sensor or gauge
When slipping the clutch	You need to pay attention to the drive	It needs to be checked
Torque booster slip	It could be the brake lever spring.	Verification required
If there are no indicators of the pressure gauge of the lubrication system of the torque increaser or the pressure data is below acceptable standards	You need to check the gauge	May require simple device replacement
When performing work on a flat surface of the soil, the tractor pulls to the side	Cause could be sun gear brake band lining	Check for suitability. Replace if necessary
If the tractor does not turn when the control lever is fully pulled back and the parking brake pedal is depressed	Possible natural wear of the lining of the stop brake bands	Needs to be checked and replaced
Attachment won't lower	Most likely the hydraulic pump has failed.	It is required to check and, if necessary, replace the stuffing box or a special sealing ring in the suction pipe. If that doesn't work, you need to change the pump.
If oil is leaking from the oil tank breather or foam is coming out	Cylinder piston seal check required	The seal of the shank of the drive gear of the hydraulic pump could fail
Generator not working properly	Check alternator and starter	It may be necessary to replace the spring and brush of the generator armature
The starter rotates but does not turn in the crankshaft starting engine	Flywheel problems	It is necessary to replace the crown or drive at the flywheel
No indication of charging current on the ammeter	junk generator	Fan drive belt needs to be replaced
There is a rattling and vibration in the teeth of the drive wheel. Or teeth slip	Check drive wheel	If necessary, replace track pins and drive wheel teeth

The engines mentioned earlier are installed on different versions of the tracked vehicle. They have one thing in common - it is reliability and accessibility when performing repair work. There are no problems with the supply of spare parts, therefore, the cost of maintenance and repair is minimized financially. To carry out repairs in the field, special mobile repair teams are created to service the equipment.

Specifications

All technical characteristics of the DT 75 tractor are summarized in Table 2.

Table 2 - DT 75 bulldozer specifications

Type of	On caterpillar
Purpose	Agriculture
Specificity	general purpose
Rated pulling force, (kgf)	3000
Tractor constructive weight, (kg)	5750
Specific metal content	76.6
Number of forward gears without UKM	7
Number of forward gears with UKM	7
Number of gears back without UKM	1
Number of gears back with UKM,	1
Speed ​​range (km/h) forward without UKM	5.15 — 10.85
Speed ​​range (km/h) forward with UKM	4.12 — 8.68
Speed ​​range (km/h) back without UKM	4.41
Speed ​​range (km/h) reverse with UKM	3.53
Track (mm)	1330
Base (mm)	1612
Clearance (mm)	326
Specific pressure on the soil (kgf / sq.cm)	0.44
Brand of the power unit	SMD-14
DT 75 engine	4 cylinders for 4 cycles. Swirl chamber with mixing system
Power at 1700 rpm (hp)	75
Torque (%)	at least 15
Fuel consumption of the power unit (g / e. l. s. h.),	195
Cylinder diameter (mm)	120
Stroke (mm)	140
Cylinder displacement (l)	6.33
Power unit weight (kg)	675
Fuel tank (liters)	245
Starting the power unit	PD-10M-2 with electric starter
Tractor weight (kg)	6440

If you suspect the unstable operation of the tracked vehicle or a malfunction occurs, you should immediately contact the specialists for troubleshooting!

Question answer

conclusions

I would like to be objective and not sing laudatory odes to domestic technology. BUT the fact that the DT 75 bulldozer has been successfully working in many areas since 1984 speaks in its favor. The technical stuffing cannot be compared with the capabilities of foreign equipment, but as experts note, the category that managed to drive the DT 75 (photo of tractor transportation on the left) claims that the tractor is not inferior to many foreign models in operation. The DT 75 tractor is cheaper than foreign competitors, the tractor is unpretentious in repair, and the replacement of parts is cheaper than imported equipment.

Even small repairs can be carried out in the field. But technology needs maintenance. Therefore, preventive work and especially the preparation of equipment for spring field work should be carried out with special attention. Great importance must be given to attachments, to analyze the causes of failure of a particular unit or assembly. Monitor the hydraulic system and prevent equipment downtime during the hot season of sowing and cultivating the land.

Video

The DT 75 video shows a bulldozer that has recently been released from the assembly line and is undergoing its first operational test.

The caterpillar-type tractor DT-75 has been produced in various modifications since the end of 1963 and differs among its counterparts in the class by its efficiency and ease of operation at a low cost.

Initially, the tractor was designed to perform various agricultural work in combination with semi-mounted, mounted and trailed mechanisms. However, high performance characteristics allowed it to become a universal unit, successfully used in various branches of economic activity.

DT-75 and its modifications were produced at the facilities of the Volgograd Tractor (VgTZ, Russia) and Pavlodar Tractor (PTZ, Kazakhstan) plants. The first of them stopped conveyor assembly in 2009 and transferred the production of DT-75 tractors to the Volgograd Tractor Company (VTK). The second - PTZ, mass-produced models DT-75M (since 1968), DT-75ML (since the mid-80s), DT-90P, DT-75T and DT-75MLK (all three - from the beginning of the 90s .). In 1998, the Kazakh plant declared bankruptcy.

Device DT-75

The basic version of the caterpillar tractor weighing from 5.5 tons and dimensions 4109.5 × 1740 × 2304 mm was driven by a 4-cylinder diesel engine SMD-14 (75 hp) with a service life of 3 thousand hours. Since the end of the 70s, it has been replaced by an improved version of the SMD-14NG (80 hp). Also, on various modifications of the tractor, engines A-41 (90 hp, model DT-75M), SMD-18N (95 hp, DT-75N), SMD-66 (170 hp, DT -75S), A-41I (94 hp, DT-75D and DT-75T), A-41SI (94 hp, DT-75DE), Belarusian D-245 (105 hp, DT -75ML, DT-75DM and DT-75T), RM-120 and RM-80 and (100 hp and 80 hp, DT-75RM).

Photo of the caterpillar model of the tractor DT-75

The power plant is started using a starting engine. In winter, a pre-heater is used to warm up the diesel engine.

Chassis DT-75 consists of a welded frame (two spars of rectangular cross-section connected by transverse round pipes), on which all components and mechanisms are mounted, rollers with rubber tires, guide and drive wheels, 4 suspension carriages and two caterpillar chains.

Clutch - permanently closed type, 2-disk. The rear axle received two single-stage planetary rotary mechanisms. The brakes are tape, floating type.

To increase traction, the transmission may additionally include:

• torque booster (UKM, planetary gearbox with friction and roller clutches; gear ratio 1.25);
• creeper (mechanical gear 4-speed gearbox);
• reverse gear (single-stage mechanical; forward gear ratio - 1.67; reverse gear - 1.35).

In order to expand the range on the DT-75 tractors, a power take-off shaft (PTO) is used, driven from the UKM drive shaft or creeper.

Gearbox - 4-way (7 forward gears and one reverse), is installed in the front compartment of the body common with the rear axle. On the front wall of the gearbox in a separate housing, a UKM mechanism or a creeper is mounted.

The basic model is equipped with a double all-metal pressurized cabin. The seat is adjustable for height and weight of the driver. Since 1978, the DT-75 has been supplied with a new sprung cab, which is shifted to the right from the central axis of the tractor to improve visibility.

To create comfortable working conditions, a ventilation device is used that supplies purified, cooled and humidified air to the cabin. In winter, the optimal air temperature is provided by a heater of a heater type.

Scheme of the tractor DT-75


1 - engine; 2 - cabin; 3 - fuel tank; 4 - hinged device levers; 5 - power take-off shaft; 6 - trailer bracket; 7 - drive wheel; 8 - central gear; 9 - caterpillar; 10 - gearbox; 11 - support wheel; 12 - clutch; 13 - guide wheel.

The tractor is equipped with a tow hitch, a rear linkage and a separate-aggregate hydraulic system. DT-75 can be aggregated with almost any agricultural implements (mounted plows and harrows, potato diggers, seeders), including semi-mounted side implements (concrete pavers, loaders). As well as with bulldozer, drilling and road construction equipment.

Specifications

Technical characteristics of the main modifications of the DT-75 tractor:

Modification	DT-75	DT-75M	DT-75N	DT-75D
Tractor type	tracked, general purpose
Rated pulling force, kgf	3000
Tractor weight, kg*:
- constructive	5550-6050	6170-6740	5830-6400
- operational	5840-6360	6640-7210	6330-6900	6295
Length:
- with hanging system	4573,5	4670	4607
- without hanging system	4109,5	4209	4240
- in transport position		4380	4380
Width	1740	1890	1890
Height	2304	2650	2650
Ground clearance, mm	326	376	290	300
The smallest turning radius, mm	2250
Base (distance between the outer rollers), mm	1612
Track width, mm	1330
Track width, mm	390
Specific ground pressure, kgf/cm2	0,44	0,51	0,49	0,42
Descent and ascent angles, degrees	20
Static lateral stability, degrees	40
Max. slope steepness when the tractor is working across the slope, deg.	15
Number of forward gears:
— basic	7	7	7	7
		16	16	23
- with UKM enabled	7	7
			7	7
Number before reversing:
— basic	1	1	1	1
- with included creeper		4	4	5
- with UKM enabled	1	1
- with included reverse gear			7	1
Speed ​​range, km/h:
- forward	5,15-10,85	5,30-11,18	5,45-11,49
- forward with the included UKM	4,12-8,68	4,24-8,94
- back	4,41	4,54	4,67
- back with the included UKM	3,53	3,63
- with creeper, forward		0,33-4,74	0,337-4,886	0,34-11,49
- with reverse gear forward			3,26-6,88	5,45-9,3
- with reverse gear back			4,05-8,54
Fuel tank capacity, l	245	315	315	315
Engine brand	SMD-14	A-41	SMD-18N	A-41I
Rated operating power, h.p. (kW)	75	90 (66,2)	95 (70,0)	94 (69)
Maximum torque, Nm	60	433	437	433
Rotation frequency, rpm:
- crankshaft	1700	1750	1800	1750
- PTO	536	553	540 and 1000	540 and 1000
Torque reserve correction factor, %	15	15	12	15
Rated pulling forces, kN:
- main	30-11,1	35,4-18,8	36,5-14,3
- with UKM enabled	37,4-33,1	44,3-39,1
- with the included reverse gear (forward / backward)			62,89/49,02-26,43-20,63
Traction force during long-term operation with included UVK, creeper or reverse gear, kgf	no more than 3500
Number of cylinders	4	4	4	4
Engine capacity, l	6,33	7,43	6,33	7,43
Cylinder diameter, mm	120	130	120	130
Piston stroke, mm	140
Compression ratio	17		16	16,5
Specific diesel consumption, g/l. s.h. (g/kWh)	195	185 (251,3)	185 (251,3)	166,9 (226,6)
Operating oil consumption by the engine from fuel consumption,%:	3	1,5	1,5
- general
- on the edge		0,8	0,7	0,4
Engine weight, kg	720		930	960

* - depending on the configuration.

Modifications

Model DT-75M. Produced since 1967 at VgTZ and since 1968 at PTZ. Differed from the base model:

• using the A-41 engine (90 hp);
• a higher cabin, shifted to the right;
• extended fuel tank (315 l) located on the left side of the cab.

Photo of the tractor DT-75M


Model DT-75B. Swamp modification, designed for agricultural work in peat extraction and drained swamps. It has been mass-produced since 1968 at VgTZ. Main differences:

• engine SMD-14NG (80 hp; 1800 rpm);
• cabin similar to DT-75M;
• spars on a welded frame are connected by elongated bars, as a result of which the width of the tractor has increased to 2240 mm, and the track to 1570 mm;
• track width increased to 670 mm, which made it possible to achieve a specific pressure on the ground of 0.24 kgf / cm2 with lowered guide wheels (longitudinal base - 2365 mm) or 0.33 kgf / cm2 with raised guide wheels (longitudinal base - 1612 mm);
• front and rear pallets were added to the design to protect the engine and transmission;
• instead of UKM, a 4-stage speed reducer is used.

Model DT-75K is designed to perform agricultural work on mountain slopes with a steepness of not more than 20 ° at an altitude of up to 2000 m above sea level. The manufacturer is VgTZ (since 1972). This modification was equipped with the SMD-14NG engine and had the following features:

• welded frame and tracks are identical to the DT-75B model;
• a support safety device was used to prevent tipping on slopes;
• the cabin had a visual roll indicator and was equipped with two seats located one opposite the other;
• the reverse gear in combination with the front and rear linkage mechanisms made it possible to perform work in a shuttle way.

The next modification of the DT-75N was produced with an upgraded SMD-18N engine. The specified unit was equipped with a turbocharger and fuel pump adjustment, due to which the power plant's power was 95 hp. (1800 rpm).

The tractor was produced only at VgTZ and was aggregated with the same attachments as the DT-75M.

Photo of the tractor DT-75N

Model DT-75S. It is intended for performance of agricultural, loading and digging and road works. Key Features:

• V-shaped six-cylinder diesel engine SMD-66 (170 hp, 1900 rpm) with gas turbine supercharging;
• 2-speed PTO;
• a torque converter that provides automatic control of the tractor speed depending on the resistance value;
• the fuel tank (360 l) and the hydraulic oil tank are installed on the left side of the cab.

The DT-75D model with A-41 or D-440-22 engines boasts improved fuel efficiency, increased reliability of the transmission, chassis and rear hitch. The traction qualities of the tractor are increased by installing a reverse gear or creeper. For aggregation, the DT-75D uses: a hydraulic control and drive system, a towing device, a rear hitch, a power take-off shaft and removable front ballast weights.

The DT-75ML model has been produced since 1986 only at PTZ. The main differences: the lining of the engine compartment has been changed, the cabin has been increased (height - 2923 mm) and the number of control devices.

Photo of tractor DT-75ML

Since 1991, wheel modifications of the tractor have been manufactured at PTZ - DT-75MLK, DT-75KP, DT-75DK and DT-75KPM. Wheeled versions were produced in small series and were used for light land reclamation, road, construction and agricultural work.

Of the less common, we point out the models DT-75V (engine SMD-14NG), DT-75RM (engines RM-80 or RM-120), DT-75DM (engine D-245.25.) and DT-75MV (engine A-41), produced only at VgTZ.
Further development of the DT-75 was found in the new VTK product under the trade name "AGROMASH 90TG" with the A-41SI-02 engine (94 hp, 1750 rpm), which has been produced since 2009.

The new crawler tractor has a new design and, like its predecessor, is distinguished by an enviable versatility. It can perform the whole range of agricultural operations, as well as road-digging, reclamation, construction and loading works.

Video review of the DT-75 tractor:

DT-75 is a universal Soviet-made tractor, the main advantage of which is a caterpillar chassis that allows you to overcome any obstacles. The machine has a minimum specific pressure on the ground, which also favorably affects the geometric cross-country ability. The equipment is designed for complex and labor-intensive operations in agriculture, industry, and in the cargo field of activity. The car went into production in 1968, and the release of the model was completed only in 1992. The production of the tractor was carried out in the Kazakh USSR, in the city of Pavlodar. The total circulation of equipment for all the years of production exceeded 2 million 700 thousand pieces, which was an achievement for Kazakh engineers. Moreover, it is an unsurpassed result worldwide. After all, the DT-75 model was produced not only for Kazakhstan, but also for other republics of the Soviet Union. Demand at that time was colossal, especially for tracked vehicles. This article presents the key advantages of the DT-75 tractor, its capabilities and characteristics.

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Description and purpose of the tractor DT-75

DT-75 is a multi-purpose tractor that quickly became a legend. He repeatedly flashed in the frames of Soviet films. Moreover, in honor of the DT-75, monuments were erected in many large Soviet cities. The secret of the machine's popularity is its reliability and unpretentiousness, proven technical solutions, ease of use, high functionality and economy, and adaptation to harsh climatic conditions. At the same time, the main purpose of the DT-75 tractor was earthmoving, and everything connected with it. For example, the machine was constantly used for plowing, cultivating, harrowing, hilling, loosening, as well as inter-row cultivation and plowing of hard virgin soil. In addition, the tractor is adapted for transport and repair and installation work, for towing and dragging loads, heavy concrete structures, etc.

Characteristics

• Country of production - Kazakhstan
• The main purpose is agriculture
• Traction category - 3000 kgf
• Tractor weight - 5,750 kg
• Maximum speed - 11 km / h
• Track - 1610 mm
• Ground clearance - 326 mm
• Specific ground pressure - 0.44 kgf / sq. cm
• Engine - diesel four-cylinder
• Power - 75 horsepower
• Torque reserve - 15%
• Fuel consumption - 195 g / e. l. With. h.
• Engine displacement - 6.3 liters
• Motor weight - 675 kg
• Fuel tank capacity - 245 liters
• Electric starter - yes.

Devices and operation

Modifications of the tractor DT-75

The DT-75 tractor received a variety of modifications, each of which had a mass audience of buyers. Let's highlight the most popular versions of the DT-75:

• DT-75B is a machine for operation in marsh conditions. The main difference is an enlarged caterpillar track and a more powerful 80-horsepower SMD-14NG engine. This modification is intended for waterlogged soils, for peat extraction. The design of the machine is reinforced with special pallets for protecting the internal combustion engine and gearbox.
• DT-75K is a specialized tractor for working on steep mountain slopes. For example, such a machine has proven itself well in the mining industry. This version of the tractor received a system that prevents tipping on steep slopes. The cabin seats are located opposite each other.
• DT-75S is a bulldozer tractor equipped with a powerful six-cylinder SMD-66 engine with a capacity of 170 horsepower.
• DT-75N - An updated version of the DT-75M, which entered production in 1984. For the most part, the machine is completely unified with the DT-75M model, with the exception of minimal technical changes.
• DT-75D is a universal caterpillar tractor with a 94-horsepower diesel engine.
• DT-75ML is a tractor with an enlarged and more spacious cab.

Tractor engines DT-75

The DT-75 tractor received an extensive range of engines, consisting of domestically produced engines. So, consider each of the motors:

• SMD-14 is an engine manufactured by engineers of the Kharkov Hammer and Sickle plant in the Ukrainian USSR. The working volume of the engine was 6.3 liters, and the power was 75 horsepower. The maximum revolutions per minute were 1700 rpm. It was one of the most common ICE for the DT-75 tractor.
• SMD-18 is a more powerful 95-horsepower turbocharged diesel unit.
• A-41 and A-41C are time-tested power plants developed to order by the Altai Motor Plant. The power of both engines was 90 horsepower, and the working volume is 7.4 liters.
• SMD-66 is a six-cylinder four-stroke engine manufactured by the Kharkov and Belgorod Motor Plants. This is the most powerful flagship power plant for the DT-75 tractor. A car with such a motor was produced in a limited edition. The working volume of the engine is 9.1 liters. This motor is designed exclusively for the DT-75S bulldozer tractor, which was considered the most powerful modification in the DT-75 model range.

All types of engines have similar auxiliary components. In particular, we are talking about a PD-10U gasoline starting device with a capacity of 10 forces, which ensured the uninterrupted start of the internal combustion engine in the hot or winter season. In addition, this was facilitated by an electric starter. When working in extremely low temperature conditions, the PZHB-200 preheater was of particular importance. All engines are mounted on a special elastic suspension, and are fixed to the frame with four screw connections.

Transmission

The DT-75 tractor is based on a welded frame reinforced with two longitudinal welded spars, which, in turn, are reinforced with transverse pipes. The gearbox and rear axle have unified components that are arranged in a single housing. This made it possible to reduce the length of the tractor and make it more compact. The design of the rear axle is represented by two planetary slewing mechanisms, in which band brakes are built. The planetary mechanism made it possible to reduce the effort on the tractor's swing arms, and thereby lighten the effort when turning the steering wheel.

Power and torque are transmitted through a manual transmission and torque converter. The design of the gearbox is represented by the following components:

• friction clutch that transmits torque to subsequent units, including wheels
• manual transmission, implemented in a compact package, together with rear axle mechanisms. The gearbox has gears responsible for driving forward and reverse.
• main gear, consisting of bevel and driven gears. It is an integral component of the rear axle, located with it in a single housing
• planetary slewing gears
• power take-off shaft that transmits power to attachments.

The chassis of the DT-75 tractor is represented by the following components:

• suspension carriage mounted on trunnions (two carriages on both sides)
• caterpillar links on which there are overlappings of running tracks
• driving wheels
• steering wheel mounted at the front
• rollers with rubber bands that guide the caterpillar with the help of rims.

Cabin DT-75

The cab of the DT-75 tractor is an example of simplicity, functionality and high ergonomic solutions. The cabin is made of high-strength steel sheets reinforced with spot welding. The cab is mounted on spring-loaded springs and has a large glass area. Wide glazing has benefited visibility. In addition, the cabin has a heating and ventilation system, as well as an air purification system that prevents dirty, dusty air from entering the cabin. The system filters the air and purifies it, after which it enters the cabin. It is noteworthy that the system turns on automatically, immediately after closing the doors. The driver's workplace is mounted on an air suspension and is adjustable in height. The steering column can also be customized. In addition, an additional seat can be installed as an option. Windshield wipers are provided for the front and rear windows, which is very convenient when working in slushy weather.

The DT-75 tractor has not lost its relevance, and today is among the most affordable tracked tractors. The machine is relatively simple and maintainable, and does not require large financial costs. For many years of production, an extensive service base has been formed, highly developed throughout the post-Soviet space. Of course, we must admit that now the car is outdated both morally and technically. But despite this, the technique continues to be in demand in the supported market.

A photo