Technical characteristics, design, photos and videos of the DT-75 tractor and its modifications

Tractor DT-75

Introduction 1 Description of the tractor 2 Purpose 3 Equipment and production 4 Technical characteristics 5 Tractor DT-75 with bulldozer equipment Conclusion Bibliography
INTRODUCTION

DT-75 (75M,RV,N,D,E) is a general-purpose tracked agricultural tractor. The most popular caterpillar tractor in the USSR. In 2008, the Volgograd Tractor Plant celebrated the 45th anniversary of the launch of the DT-75. The tractor has gained a good reputation due to its successful combination of good performance properties (simplicity, efficiency, maintainability) and low cost compared to other tractors of a similar class. Over such a long period of time, the DT-75 was modernized several times: it was modified externally and internally, usually for the better. As of 2009, more than 2,741,000 units of tractors were manufactured. In August 2009, another modernization of the tractor rolled off the plant assembly line. The restyled tractor is equipped with a new cabin and a plastic hood, a new economical and environmentally friendly Finnish Sisu engine, the production of which was launched at the Vladimir Tractor and Motor Plant. It has a new index VT-90V (Trade name “Agromash 90 TG”). The signature color of the tractor has changed from red to blue-gray with orange color inserts. The production of the previous obsolete design DT-75DE is still ongoing. An industrial modification of the DT-75 tractor is the T-90 tractor, which differs from the base model in the presence of support hinges for hanging the front blade and front hydraulic cylinders for controlling it. In addition, the T-90 has different transmission ratios.

Tractor attachments

As the operating instructions for the unit indicate, it can be used with almost all types of attachments.

The structures aggregated to the model include:

• three-furrow plow for deep plowing of hard soils and virgin lands;
• rotary mower for mowing large weeds up to 1 m high;
• potato planter and potato digger for planting and harvesting tuber crops;
• sprayer for spreading fertilizer over a planted area;
• trailer with a total weight including cargo of up to 2 tons.

To work with the DT-75 agricultural machine, you can also use a seeder, harrow, baler and other types of attachments. The video will tell you about the use of different designs together with the unit.

Reviews from owners indicate the high endurance of DT-75 tractors, their maneuverability, maneuverability and long service life.

Table 1 Technical data

Machine type	DT - 75
Traction class	3
Engine	D-440-22(A-41)
Operating Power(HP)	95
Crankshaft speed at operating power (rpm)	1750
Specific fuel consumption at operating power (g/hp.h.)	175
Torque reserve coefficient in traction mode (%)	35
Number of forward gears (with speed reducer, with reverse gear) and reverse gears (with speed reducer, with reverse gear)	7 (23,14) 1 (5,7)
Forward speed range (km/h) main with speed reducer with reverse gear	5,3…11,2 0,33…11,2 3,17…11,2
Longitudinal base (mm)	1612
Track (mm)	1330
Ground clearance (mm)	380
Track width (mm)	390 or 470
Length (with attachment in transport position) (mm)	4400
Width (mm)	1850
Height (mm)	2710
Operating weight (kg)	6950
Average soil pressure (kPa)	41,5

The tractor is equipped with a four-cylinder, four-stroke diesel engine SMD-18N, liquid-cooled and turbocharged. The main engine is started from the driver's seat using a starting engine with an electric starter. To heat the engine before starting it, the tractor is equipped with a pre-start heater PZHB-200. The tractor components and mechanisms are mounted on a welded frame, which consists of two longitudinal welded spars of a closed rectangular cross-section, interconnected by transverse links. The clutch is dry, double-disc, permanently closed. The gearbox and rear axle are mounted in one housing. The rear axle has two single-stage planetary rotation mechanisms with band brakes, providing braking of the tractor both in forward and reverse. The planetary mechanism allows you to reduce the effort on the tractor turning control levers.

The tractor transmission, chassis, PTO, and rear linkage mechanism are completely unified with similar parts and assemblies of the DT-75 and DT-75M tractors. The chassis consists of drive and guide wheels, support rollers with rubber bands, four balance suspension carriages and two track chains. To work with beet harvesters, a unified narrow caterpillar track is installed on the tractor. The tractor is equipped with a separate-unit hydraulic system, a rear linkage mechanism with an automatic coupler, which allows you to connect machines and implements using two-point and three-point schemes, and a tow hitch. The hydraulic system and attachment are unified with the DT-75 and DT-75M tractors. The cabin is a closed type, all-metal, two-seater, sealed and sprung, equipped with an air cooler and a heater. The seat is adjustable according to the weight and height of the driver. To improve visibility, the cabin is shifted to the right of the tractor axis, and the fuel tank is located on the left side of the cabin. Served by a tractor driver.

Tractor TDT-75: description and technical characteristics

The TDT-75 tractor is a tracked vehicle of the third traction class. Produced by Altai Tractor OJSC, it served as the basis for the creation of modern skidding mechanisms TT-4 and TT-4M.

The machine has sufficient power to transport large and medium-sized wood from felling sites to storage sites in the absence of equipped roads.

Used for loading and unloading packaged wood. The chassis can be used together with trailed and mounted equipment for various purposes.

TDT-75 effectively performs:

• skidding processing of trunks and whip fragments;
• moving the trunks with the top back and forth;
• dragging of cargo, with incomplete and full loading or suspension.

Unit features

1. Low specific pressure on the soil. Wide caterpillar tracks ensure movement on uneven forest roads, snowy areas, and swampy areas.
2. A diesel engine, in its time, is quite economical in terms of fuel and lubricant consumption.
3. The chassis of the machine is universal - special devices used in logging and primary wood processing in off-road conditions are mounted on the platform.
4. Ground clearance provides sufficient maneuverability on rough terrain.
5. Increased traction force of the power transmission, high reliability of the chassis.
6. Metal protection mounted underneath the frame.
7. The motor installed in the cab does not provide comfortable conditions for the driver.
8. Compared to the TDT-55 skidder, the maneuverability of the unit in forest conditions is reduced due to its large weight and dimensions.

Technical and operational parameters

An industrial crawler tractor of traction class 75 with bulldozer and loosening equipment is designed for the development of particularly heavy frozen and rocky soils in the mining industry, for performing large volumes of earthmoving work in road construction and in other industries under various climatic conditions. Eliminates drilling and blasting operations during stripping operations. Technical characteristics of T-75.01 (T-800)	6DM-21T
Manufacturer	pipe engine plant Ekaterinburg
Type	4-stroke with direct fuel injection, liquid cooled with gas turbine supercharging and intercooling of charge air
Operating power, kW (hp)	603 (820)
Rated crankshaft rotation speed, rpm	1 500
Number of cylinders	6
Working volume, l	43,64
Cylinder diameter, mm	210
Piston stroke, mm	210
Cooling system	liquid
Lubrication system	forced with dry sump
Transmission
Hydromechanical, consisting of a single-stage three-wheel torque converter, cardan transmission and a module consisting of a planetary three-shaft gearbox and rotation, stopping brakes, bevel gear; two-stage onboard gearboxes with a pair of spur gears and a planetary gearset and hydraulic transmission systems. The gearbox provides four forward gears and two reverse gears.
Chassis
The tractor is equipped with an elastic torsion bar suspension with individual suspension of the road wheels. Closed-joint track with lifetime lubrication.
Number of road wheels on each side	8
Number of support rollers on each side	2
Tension and release mechanism	hydropneumatic, telescopic type
Track shoe width, mm	700 (850)
Pitch, mm	290
Number of shoes per track	79
Grouser height, mm	100
Electrical equipment
The automatic control system (ACS) allows the driver to monitor the condition of components and systems both when preparing the tractor for work and during operation.
Rated power, V	17,.0
Generator power, kW	3,5
Number of batteries	4
Cabin
Metal, double, volume 3.5 m3, with double glazing and heat and sound insulating lining. It is isolated from the tractor frame by rubber shock absorbers. Has a protective fence installed on the tractor support legs.
Hydraulic system
Two-stage, separate-unit with gear-type pumps, unloaded when the attachment control lever is in the neutral position. The selector regulators for ripper and bulldozer equipment are separate, a full-flow filter is installed on the drain pipeline in the hydraulic tank.
Nominal pressure in the system, MPa	17.0
Safety valve setting pressure, MPa	17.5
Pressure in cascade I (control), MPa	2.5
Capacities
Fuel tank, l	2050
Cooling system, l	383
Engine lubrication system, l	225
Gearbox and rear axle, l	200
Torque converter, l	200
Final drive (each), l	75
Hydraulic system of attachments, l	580
Air conditioning, l	2
Bulldozer equipment
Hemispherical, fixed blade with hydraulic skew
Dump capacity, m3	26,2
Blade width, mm	6 000
Blade height, mm	2 600
Maximum blade depth, mm	800
Main cutting angle, degrees	55
Change in cutting angle, degrees	50-60
Blade lateral angle in each direction, degrees	8
Blade hydraulic cylinders
Lifting	2
Skew	1
Weight of bulldozer equipment, kg	16 295
Ripping equipment
Single-tooth ripper with adjustable ripping angle
Maximum depth, mm	1 800
Change in loosening angle, degrees (at a normal angle of 45 degrees)	37 — 62
Number of hydraulic cylinders
Lifting and lowering	4
Removing and installing the ripper pin	1
Weight of loosening equipment, kg	11 200
Ground pressure with shoe width 700 mm, MPa
Tractors	0,0937
Tractors with bulldozer and ripper equipment	0,158
dimensions
Length, mm	7 945
Width, mm	4 185
Height, mm	4 775
Track, mm	2 880
Base, mm	6 220
Overall dimensions of the tractor with bulldozer and ripper equipment
Length, mm	12 400
Width, mm	6 000
Height, mm	4 775
Operating weight
Tractor, kg	76 500
Tractors with bulldozer and loosening equipment, kg	106 000

Optional equipment:

Cabin protective frame Air conditioning Chassis protection Final drive protection Pre-heater Cabin heater Fire fighting equipment

Transitional shelves, handrails, footrests

Special offer

Exchange rates of the Central Bank of the Russian Federation

Indicator Unit of measurement Quantity Designation of the machine TDT-75 Traction class 3 Chassis design Crawler version Purpose Skidder Traction force kgf 3,000 Weight of the machine ready for operation 11.0 Gear ratio of the gearbox modes: forward movement reverse movement 5 1 Rate of movement in operating mode: forward movement reverse movement km/h 7.64 2.57 Track along the edges of the gu hay belts 1.91 Base axes of the head rollers and drive sprocket 2.72 Clearance cm 0.55 Load of the caterpillar belt on the soil (specific) kgf/cm 20.42 Dimensions LxWxHm 5.505x2.37x2.70 Designation of the power plant D-75T-AT Power parameters at 1,500 crankshaft revolutions per minute l. p.75Specific consumption of fuel grams per liter. With. per hour 205 Parameters of the cylinder group: cylinder diameter piston stroke ignition order mm 125 152 1 * 3 * 4 * 2 Engine weight kg 1150 Refilling fuel 110 Starting the power plant Starting motor PD-10M

Power point

The skidder is equipped with a D-75T-AT diesel engine, a modification of the D-60T engine.

The engine is a 4-stroke engine with an in-line arrangement of 4 cylinders in a cast-iron block, the fuel mixture is formed by a vortex chamber method. The power unit has a power rating of 75 hp. With. at 1,500 crankshaft revolutions per minute.

Changes have been made to:

• fuel supply system. The fuel pump provides fuel supply with a capacity of 18.0 kg/h;
• the shape of the combustion chambers and the bottom of the aluminum cylinder. The injectors and cylinder head sockets are placed at an angle of 55° to the horizontal;
• cylinder air filling system;
• suction manifold;
• gasoline engine starting systems.

Power transmission

The clutch is a mechanism with two permanently closed disks, dry type.

The drive shafts ensure the transmission of motor rotational torque to the winch and transmission mechanisms. A small cardan-type shaft provides connection between the clutch and the transfer box. A large shaft connects the gearboxes and transfers.

The gearbox shafts rotate on bearings pressed into the gearbox housing.

Important! The box provides 5 torque transmission modes for forward movement and 1 for reverse direction. The locking device does not allow changing modes when the clutch is engaged.

The gearbox is controlled from the driver's cabin through a shaft with a cardan unit.

Chassis

The welded frame is made of 2 steel spars connected by three transverse pipes, a protective sheet and a front sheet.

The suspension design uses spring and balancer units.

Table 4 Technical characteristics of the DT-75 Tractor with bulldozer equipment

Bulldozer equipment	DZ - 42	DZ - 42P
Bulldozer blade dimensions, mm:
- width	2560	2800
— height (with visor)	800 (950)
Speed ​​of raising and lowering the blade, m/s, not less	0,15
Blade lift height, mm	635
Lowering the blade below the supporting surface of the tracks, mm	300
Blade rotation angle in plan, degrees.	—	+25°
Entry angle, degrees	20
Cutting angle, deg.	55
Maximum permissible slopes during bulldozer operation (longitudinal and transverse), degrees.	20
Blade control	hydraulic
Blade lift hydraulic cylinder type	2 way action
Number of hydraulic cylinders	2
Weight of bulldozer equipment, kg	800	900
Overall dimensions of the tractor with bulldozer equipment, mm:
- length	4650	5200
- width	2560	2800
- height	2710	2710

Engine of Tractor DT-75 with bulldozer equipment:

Four-stroke liquid-cooled diesel engine with turbocharging. Instead of a starting engine, it can be equipped with an electric starting system.

Table 5

Model	D-440-22 (A-41)	RM-80
Operating power, kW (hp)	70(95)	59(80)
Cylinder diameter/piston stroke, mm	130/140	110/130
Crankshaft rotation speed at operating power, rpm	1750	1800
Number of cylinders, pcs	4	4
Working volume, l	7,43	4,94
Specific fuel consumption at operating power, g/kW*h (g/l.s.h)	238(175)	231(170)
Torque reserve factor, %	35	25

Transmission of the DT-75 Tractor with bulldozer equipment:

Mechanical, ensures minimal power loss and high reliability.

Table 6

Transmission	seven-speed, with moving gears
Clutch	dry, double disc
Reverse gearbox	mechanical, three-stage
Number of gears — forward / reverse	14/7
Speed ​​range, km/h	DT-75D	DT-75R
- forward drive	3,17…11,2	3.2b…11.5
- reverse	3,94…8,3	4,05…8,5
Rotation mechanism	single stage, planetary

Design and operation of the planetary mechanism (PMP) DT-75M

The planetary turning mechanism of the DT-75M tractor consists of two symmetrically located identical planetary devices for controlling the right and left track chains.
To turn the tractor, the tracks are turned off separately using planetary mechanisms, which, in combination with brakes, can act as friction clutches, i.e. disconnect and smoothly connect transmission shafts. The driving elements in the planetary turning mechanisms are ring gears 8 inside a common drum 4, and the driven elements are carriers 14, which are connected by shafts (half shafts) 1 to the drive gears of the final drives. On axes 13, fixed in the carriers, satellites 12 rotate, which connect the sun gears 11 to the ring gears.

Rice. Components of the turning mechanism: 1 - shafts (half shafts); 2 — stopping brakes; 3 — sun gear brakes; 4 - drum; 5 and 6 - driven and driven bevel gears; 7 — secondary shaft of the gearbox; 8 — ring gears; 9 — final drive gears; 10 — driving sprockets; 11 — sun gears; 12 — satellites; 13 — satellite axes; 14 - drove.

When the tractor moves in a straight line, both sun gears are braked. The torque from the secondary shaft 7 of the gearbox is transmitted through the bevel gears 5 and 6 to the ring gears. The satellites they rotate roll along the sun gears and drag the carrier along with them through the axles. From the carriers through the axle shafts and final drive gears, the torque is transmitted to the drive sprockets 10, and they, rotating, rewind the tracks at equal speeds.

To make a smooth turn of the tractor, for example to the left, you need to move the left lever towards you. When this happens, the brake band releases the brake pulley and the sun gear is released. When one of the sun gears is released, the satellites stop rolling over it, as it itself begins to rotate in the opposite direction. Therefore, the transmission of torque to the carrier stops, i.e., the caterpillar is disconnected from the transmission. However, due to the pushing force transmitted through the frame from another caterpillar, the disconnected caterpillar still continues to rewind, although at a lower speed. Therefore, the tractor will turn smoothly, especially when the resistance of the towed vehicles is low. In this case, the carrier, although disconnected from the ring gear, still continues to turn in the same direction, since it receives rotation from the lagging track through the sprocket and final drive.

To turn the tractor sharply, after turning off the sun gear brake, press pedal 17 of the driver brake. Then the brake band 12 stops the brake pulley 1 and brakes the shaft 2. The tractor makes a sharp turn. If you stop it with the brake, the sprocket and caterpillar will stop - the tractor will turn sharply in place.

When both sun gears are released simultaneously, the transmission of torque to the tracks stops and the tractor stops.

Planetary gears serve not only for turning, but also as additional gearboxes, which reduces the load on the gearbox parts and on the bevel gears of the rear axle.

The axle housing 1 is cast together with the gearbox housing. The middle compartment, where the planetary rotation mechanisms are located, and the cavity of the gearbox form a common oil bath. The side compartments are dry (the brakes are located here).

The driving bevel gear is manufactured together with the secondary shaft of the gearbox, and the driven one 26 is bolted to the flange of the ring gear drum 27, which rotates on ball bearings. The inner rings of these bearings rest on cups 24, pressed into the bores of the partitions. At the junction of the driven bevel gear and the flange of the ring gear drum, shims 25 are installed to adjust the engagement of the bevel gears.

In the drum 27 there are two internal ring gears, each of which is connected by three satellites 29 with its own sun gear 31. The teeth of the sun gears are cut at the ends of long hubs, which are inserted into cups 24 and rest on bronze bushings pressed into them.

The satellites rotate in needle bearings on axes 30, fixed in carriers 28, which are triangular-shaped steel castings. The inner ends of the shafts (half shafts) 37 are inserted into the splined hubs of the carriers. Their outer splined ends are connected to the drive gears 36 of the final drives.

Rice. Drive axle of the DT-75MV tractor: 1 - body; 2 and 3 — brake bands; 4 — sun gear brake pulley; 5 — stopping brake pulley; 6, 21 and 32 - covers; 7 and 8 — adjusting nuts; 9, 12 and 18 - earrings; 10 - fingers; 11 and 13 — levers of the stopping brake mechanism; 14, 19, 20 and 22 - thrust; 15 and 16 — levers of the sun gear brake mechanism; 17 — lever axis; 23, 34 and 40 - springs; 24 - glass; 25 — adjusting shims; 26 — driven bevel gear; 27 — ring gear drum; 28 — drove; 29 — satellite; 30 — satellite axis; 31 — sun gear; 33 — oil seal; 35 and 39 — locking strips; 36 — final drive drive gear; 37 — shaft (axle shaft); 38 - seal; 41 — oil damping casing; 42 and 44 - plugs; 43 - support adjusting screws.

Bevel gears and planetary mechanisms are lubricated with transmission oil, which is poured into the middle compartment to the top mark on the rod fixed in the filler plug.

Dimensions and weight of the DT-75 Tractor with bulldozer equipment:

Longitudinal base, mm	1612
Track, mm	1330
Ground clearance, mm	370
Track width, mm	390
Length (with attachment in transport position) from bulldozer. equipment VDZ-42(VDZ-42P), mm	DT-75D 4890 (5310)	DT-75R 4650(5070)
Width, mm	2560	2560
Height, mm	2710	2710
Operating weight with bulldozer. equipment VDZ-42, kg
- with rear linkage	7530	—
- without rear linkage	7170	6900
Operating weight with bulldozer. equipment VDZ-42P, kg
- with rear linkage	7700	—
- without rear linkage	7340	7070