What is good about the DZ-42 bulldozer and what engine power does it have?

The D3-42 bulldozer is a self-propelled special equipment on crawler tracks of the earth-moving type, which was in demand back in the days of the Soviet Union. The most significant and labor-intensive process in any construction is earthmoving work, where in the modern race for time and quality of work, manual labor has practically become obsolete.

Appearance of bulldozer D3-42

History of creation

The first machines of this model were released from the assembly line by the Volgograd Tractor Plant. The event took place back in 1963. The tractor replaced the popular, although long-outdated, DT-75 unit. New equipment has a chance to replace old equipment on construction sites, shaping the horizon and performing all kinds of earthmoving activities. Now the former VgTZ has turned into a tractor company of a concern called “Tractor Plants”.

The multifunctionality of the bulldozer is due to the presence of a universal blade, from which the driver was able to change the working tilt angle. Over a period of more than half a century, the plant has produced many modifications of the basic model, although demand for it still remains.

Classification of bulldozers. Bulldozer classes by traction force

No one could have imagined that inventor James Otis's simple experiments in 1929 with a "mechanical blade" - a wooden shovel-shaped shield mounted on the front of a steam tractor - would become the prototype for the first bulldozer.

From a “mechanical shovel” to a high-tech unit

By the way, the word “bulldozer”, which appeared in everyday use at the same time, did not characterize any specific mechanism, but the force that had to be applied in order to move any mass.

The first progenitor of this unit, referred to only as a “mechanical shovel,” looked very impressive, was clumsy, noisy and had only 15-30 hp. With. power. But still, in the middle of the 19th century it was a certain success.

And after just a short period of time, the power units of these machines acquired the necessary power to carry out the entire range of work.

Go to the bulldozer catalog

A modern, familiar bulldozer is a complex engineering machine or a separate attachment that operates in a cyclic manner. The main working unit of a bulldozer is the blade. A separate drive of the working part (hydraulic or mechanical) is capable of raising, turning, tilting and lowering the blade.

Thanks to this, the cost of such high-power equipment when moving soil is minimized. After all, engine power is not wasted on this.

A modern bulldozer is a self-propelled machine, most often built on a tractor chassis (tracked or wheeled) and equipped with a blade of various designs.

However, both a self-propelled excavator and a pipe layer can have a bulldozer blade, which greatly increases their performance and versatility.

Bulldozers: their types and classes

This type of equipment is classified not only according to the power of the power unit, the type of blade control, the chassis or the weight of the machine itself, but also according to their operational purpose. In addition, there is such a type of mechanism as extracurricular. But first things first.

Types of bulldozer undercarriage

The most popular are tracked vehicles. Thanks to the tracks, they have increased traction and grip properties and provide minimal pressure on the ground. But wheel-driven bulldozers differ from tracked ones in their mobility. They are most often used for work within the city.

Power classification

Naturally, the high performance of a bulldozer directly depends on its power and weight. We can say the following: a light and high-power bulldozer will work just as poorly as a low-power, but heavy one. Finding the golden mean in relation to these values ​​for a bulldozer, and thereby ensuring high performance of the machine, is the main task of the designer.

Bulldozers are distributed according to traction force:

• for small-sized ones, with a tractive effort of up to 0.6 tons. Used in gardening to move small volumes of loose materials.
• light, with a capacity of 0.6 to 3 tons.
  The main tractor for city utilities. Used for clearing snow, removing debris, moving light construction materials (dry sand, small crushed stone, etc.). An example is: tractors produced by MTZ (Belarus), YuMZ-6KM.
• medium, from 3 to 9 tons. Used for developing soils of category 1-2. Cleaning and planning of the territory. An example is the DT-75, T-4, T-8 tracked tractors.
• heavy, from 9 to 35 tons. They represent the main fleet of bulldozer equipment.
  They are used in the construction of roads, the construction of embankments, dams, the development of open-pit natural resources, the preparation of construction sites, backfilling and planning of large production sites in terms of volume and area. Allows aggregation with a ripper for the development of frozen and rocky soils of categories 3-5.

  Previous classes of machines do not allow the installation of a ripper. An example is the bulldozer T 170, bulldozer B10, bulldozer B12, DET 250.

• super heavy, more than 35 tons. Used for the development of rocks and rocks. Construction of especially large facilities such as the Sayano-Shushenskaya hydroelectric power station. Example: T 35, T 800.

Traction force is the force that the bulldozer develops on the hook, which is usually located at the rear. In accordance with Newton's 3rd law, the mass of the tractor is always greater than the traction force.

Peculiarities

DZ-42 is a vehicle that belongs to the third category of traction class. When it was created, this was a worthy indicator. The tractor differed from its predecessor (DT-75) in that it had a reversible gearbox. This innovation made it possible to use all the technological advantages of technology.

Although, in comparison with its predecessor, the DZ-42 somewhat lost its speed advantages, it acquired a different quality - it began to cultivate difficult soils. The equipment is actively used by housing and communal services workers (it digs pits for laying utility lines for any purpose), agriculture, and construction workers.

Dimensions of bulldozer DZ-42

The most popular modifications of the unit were models 42G and 42T. If the first was developed specifically for organizing land reclamation, the second made it possible to cultivate difficult-to-pass rocks and work directly in wetlands.

The components for all bulldozers of any modification, blades, have two design options: rotating or non-rotating. Both options are adapted for their specific purposes, so the customer has the right to demand the installation of exactly the attachment that he needs.

Bulldozer equipment on DT-75

Standard, classic non-rotating straight blade. Thanks to the slightly modified geometry of the frontal sheet in combination with enlarged sidewalls, productivity when separating soil / digging / and more stable retention of the drawing prism when it is moved by a bulldozer has significantly increased.

In terms of application, little has changed. The main purpose is for excavating soil by bulldozing and moving it.

Clearing the road of snow, leveling the construction site, planning the territory or filling the silo, all this can be easily done by the DT-75 tractor equipped with the DZ-42 bulldozer blade.

Technical characteristics of bulldozer equipment DZ-42

Bulldozer equipment DZ-42P

A rotary blade is a more functional and technologically advanced bulldozer equipment.

Due to additional quickly reinstalled fasteners, it is three-position. Depending on the work being performed, it can be installed in the position of a straight blade or a rotary blade, with a rotation of 25 degrees relative to the tractor to the left or right.

A rotary blade is more effective when cleaning roads and grading work. With its help, it is easier to remove rock from planned areas, fill trenches, and so on.

Used on soil categories I and II.

Technical characteristics of bulldozer equipment DZ-42P

Bulldozer equipment DZ-42U

Due to the additional third hydraulic cylinder, the scope of use of the DT-75 tractor has expanded significantly.

In fact, this blade is 3 in 1:

— can be used as a direct blade DZ-42

- like a rotary blade DZ-42P, with a change in the blade angle by 25 degrees. left or right

— transverse misalignment up to 8 degrees. carried out by a mechanic from the cabin, allows planning at an angle to the horizon.

Technical characteristics of bulldozer equipment DZ-42U

Bulldozer equipment DZ-42T

Straight fixed blade for the DT-75 peat tractor /with an extended tracked base/. The main difference from the usual DZ-42 is the increased distance between the blade drawbars and the increased shovel width up to 2800 mm.

Technical characteristics of bulldozer equipment DZ-42T

Specifications

The powerful power unit of the bulldozer is diesel, equipped with turbocharging and a liquid cooling system. Thanks to these improvements, the machine is able to work longer in difficult conditions.

The element of the DZ-42 that allowed the vehicle to be called a bulldozer is the blade. The device is attached to the cross beam using trunnions, as well as box-shaped bars pushing it. The position of the blade during operation is stabilized by a rigid screw-type brace and a hydraulic stop.

The device of the bulldozer DZ-42

The blade maintains its horizontal state due to the presence of a compensation mechanism. It does not allow the attachment to warp, since it distributes the load that appears during operation evenly.

The lower edge of the hitch has cutting knives. They are replaceable and equipped with a pair of blades. A special canopy is fixed in the center, which counteracts the soil tending to spill over. Two hydraulic cylinders are mounted on brackets welded to the transverse beam to ensure the movement of attachments. They are controlled by hydraulic pressure. It is created by a gear pump with a hydraulic distributor in three sections.

Model specifications:

Bulldozer DZ-42

Bulldozer DZ-42 (VgTZ DZ-42) is a self-propelled earth-moving and transport device moving on caterpillar tracks. This model became widespread in the USSR.

The equipment was intended for developing soils of the second and first categories.

The DZ-42 could carry out leveling work and move bulk material; using this powerful machine in the USSR, earthen embankments were erected and layers of soil were removed.

The bulldozer was produced at the Volgograd Tractor Plant. It is based on the most popular model DT-75. The developers did a great job when creating the DZ-42, endowing it with a lot of additional capabilities and unique characteristics.

These included the ability to move bulk cargo. Specialized equipment allowed the DZ-42 to dig ditches, trenches, and clear roads of dirt and snow.

The earth-moving and transport device on bulldozers of this model has found application in the areas of public utilities, industry and agriculture.

The basic version of the DZ-42 industrial modification was equipped with various types of blades: fixed and rotary blades.

The bulldozer itself, in fact, turned out to be a DT-75 tractor with bulldozer mechanisms installed on it.

Depending on the category of the blade, there were two modifications of this machine: DZ-42P had a full-rotating blade mechanism, DZ-42 had a fixed mechanism.

Photo and video

The first model made it possible to change the inclination of the moldboard equipment in relation to the axial support. The maneuver made it possible to significantly increase the performance of the bulldozer when performing work operations. Upon additional request, the DZ-42 was equipped with a universal rotary blade with a hydraulic skew function or a rotary type mechanism.

Another version of the DZ-42, the DZ-42T, was also produced. It was intended for excavation operations on unstable and weak soil (swampy area with wet soils). The model was called “peat modification”.

Subsequently, several more derivative variants of the DZ-42 appeared.

The bulldozer developers made the modifications of this equipment almost universal, so the buyer could choose the right model according to his needs, soil conditions and climatic conditions.

Technical characteristics of bulldozer DZ-42

• The DZ-42 model received a diesel engine with a rated power of 90 (95) kW (hp).
• The bulldozer's fuel consumption was 8.4 liters during hourly operation.
• The model's engine provided a speed range of 0.33-11.1 km/h.
• Ground pressure indicator – 0.47 kg/sq.cm.
• Overall dimensions of the equipment - 4980x2520x2650, weight - 7.39 tons.
• The traction force of the DZ-42 was 36.5 kN.
• Ground clearance was 380 millimeters,
• track - 1330 millimeters.

Device

The DZ-42 was equipped with a four-cylinder, four-stroke diesel engine. The transverse beam in the model was attached to the side member brackets very rigidly.

The latter were part of the tractor and were located between the rollers, which supported the emphasis. The hydraulic system belonging to the tractor brought the hydraulic cylinders into working position.

Its design included a distributor of three sections and a hydraulic pump.

The layout of the DZ-42 was thought out quite well. The developers took into account previous experience and successfully arranged all the parts, so operating the machine was convenient and simple. The equipment and design turned out to be well organized.

From the cabin, the bulldozer operator had an excellent view of the movement of the equipment. The driver controlled the work area, observing the operation.

The DZ-42 was distinguished by its reliable and durable design, allowing it to cope with increased loads.

The speed of this model can hardly be called high. However, its disadvantage is fully compensated by performance and power indicators. At the same time, the most important quality of earthmoving and transport equipment has always been the possibility of uninterrupted operation and reliability in operation.

The DZ-42 fully possessed these qualities. With proper technical inspections, a model in modern conditions can last many times longer than the warranty and operational periods.

If any part or mechanism of the bulldozer breaks down, replacing it will not be so difficult, after which the equipment will be ready for hard work again.

Cost of bulldozer DZ-42

The average price of a new DZ-42 is 1.2-1.6 million rubles. At the same time, there are quite a lot of offers on the market with supported bulldozers of this model. They will cost slightly less - 0.7-0.9 million rubles. Options “not running” or with serious defects are offered for 150,000-250,000 rubles.

Engine

The machine is equipped with one of five engine options. All of them are diesel, four-stroke, equipped with liquid cooling and direct fuel injection. The cardinal difference is engine power. Two motors provide a value of 80 hp. s., one - 90 l. s., the rest (installed more often) have an indicator of 95 liters. With.

The engine is started by rotating the starter. The rotational force is transmitted through a friction clutch to the mechanical gearbox of the PP. The engine lubrication system is forced-oil.

Flaws

The only drawback of the D3-42 bulldozer was and remains its low speed, but its power, traction, productivity and reliable uninterrupted functionality more than compensate for this disadvantage. In addition, the advantage of the D3-42 is its maintainability, i.e., if any element fails, it is quite easy to replace it.

Modifications

Thanks to the modernization work, the same DT-75 tractors came off the assembly line, but already equipped with rotary and fixed-type blades.

Crawler tractor DT-75

Based on the type of blade, two versions of this special equipment were distinguished:

1. D3-42P is a unit with a full-rotary blade, which has the ability to change the tilt of the blade mechanism. Its distinctive characteristics were the presence of a hydraulic transfer function and, in fact, a rotating mechanism. Improved maneuverability indicators made it possible to significantly increase productivity in carrying out work manipulations.
2. D3-42 - had a fixed blade mechanism.
3. D3-42T is a special model capable of carrying out excavation work on wet and swampy soils, for which it received its second name “peat modification”.

Bulldozer DZ-42T

Today, the manufacturer VgTZ continues to produce various modifications of the D3-42, which are in high demand.

Technical specifications

The D3-42 bulldozer is characterized by traction class 3, and the main difference between the D3-42 and the basic version DT-75 is the use of a reverse gearbox and a blade mechanism. This makes it possible to operate it in difficult climatic conditions and on difficult soils belonging to categories 1 - 2.

The turbocharged diesel engine is equipped with a liquid-based cooling system, which allows the bulldozer operator to operate the equipment for a long time without interruption for cooling breaks.

In addition to the D3-42, D3-42P and D3-42T models, another modification was created, namely, the D3-42G bulldozer, designed to provide reclamation services in agriculture, for operation in mountainous areas and other locations where the soil is moderately heavy. .

This model of special earthmoving equipment has a powerful (up to 90 l/s) power plant and larger dimensions. And a double-acting hydraulic cylinder allows the blade to penetrate the ground to a depth of 30 cm and rise to a height of up to 63 cm.

So that you can visualize the differences between the D3-42G bulldozer and the basic D3-42 model in terms of technical characteristics, you should be guided by this table:

Device

The multifunctional unit D3-42 is widely used due to its well-designed design and layout, namely:

Design of bulldozer DZ-42

• The engine runs on diesel fuel, is started by an electric starter and has 5 models, which are four-stroke power plants.
• The models differ only in power: RM-80 and SMD-14NG - 80 l/s; A-41 - 90 l/s; SMD-18N, D245.5S2, D440-22 - 95 l/s.
• All models of this special equipment have a tracked undercarriage system. A solid metal frame and spring-type suspension are used. In the space between the caterpillar tracks there are side spars, firmly connected to the transverse beam, which helps to withstand heavy loads and not damage the top layer of soil, which is especially important during agricultural manipulations.
• The size of the track depends on the model and can vary from 390 to 470 mm.
• The hydraulic system consists of a pump, a distributor with a hydraulic lock, a hydraulic power cylinder and a safety valve that controls the hinged mechanism. The hydraulics receive oil through an oil tank and filter.
• The manual transmission is seven-speed. Installed near the rear axle. To start the movement, a dry clutch is used - a closed double-disc part.
• This unit is braked by band brakes.

The modern cabin was designed taking into account past mistakes, which increased the productivity of the bulldozer operator, namely:

1. good visibility gives the driver the opportunity to observe all work areas;
2. reinforced with a frame for safety;
3. comfortable double seat with the ability to adjust to specific driver parameters;
4. availability of heating, air conditioning and air purification systems.

Comfortable driver's cabin

Separately, I would like to pay attention to attachments, which have 4 types:

1. BNDT-10 is a non-rotating version, weighing almost 830 kg, a rotation angle of 25 degrees and a width of 2 m 52 cm. It is used for snow removal work and on construction sites.
2. BNDT-20 is an analogue of the first option, but with a width of 2 m 80 cm and a weight of 874 kg.
3. BPDT is a rotary version with a rotation angle of 25 degrees relative to the axis of the unit, weighing 1 ton 70 kg and width 2 m 80 cm.
4. BUDT - technical characteristics are the same as BPDT, but has a skew of 8 degrees along the transverse plane, which makes this type a universal rotary mechanism.

When moving forward, the blade deepens into the ground, which facilitates soil cutting. The resulting soil prism is moved by a drag in front of the bulldozer to the unloading site. Then the blade mechanism rises and in this position the equipment returns to the point of soil collection.

The D3-42 bulldozer gains the maximum volume of the drag prism on a piece of soil 6 to 8 m long. The expedient length of soil movement does not go beyond 60 m.

If you have an urgent need to rent special equipment of this type, then pay attention to the main operational parameters, namely, hourly productivity and traction data.

Transmission with hydraulics

The car is equipped with a seven-speed manual transmission. It is located near the rear axle of the unit. To propel the vehicle, the rotating force of the engine is transmitted through a dry, double-plate, permanently closed clutch.

The brake mechanism of the bulldozer is of the belt type. To reduce the loads created when the car turns, a pair of planetary gearboxes are provided on the rear axle.

The installation hydraulics are built-in. It has a power hydraulic cylinder, the pressure in which is provided by a hydraulic pump, safety valve, and distributor. This entire system controls the movement of attachments. Oil is supplied to the hydraulic pump through a filter from the oil tank.

Cabin

The increased strength of the driver's cabin is ensured by its all-metal construction. Additionally, the body is reinforced with a safety cage, which is guaranteed to protect a person even when the bulldozer overturns.

The interior is sealed, so the operator is reliably protected from dust particles that rise around during operation. A ventilation system with a powerful heater is installed inside the cabin. They provide a comfortable environment in all weather conditions.

When an operational need arises, the cabin can move relative to the base of the machine, thereby providing the driver with a convenient view of the site where excavation work is being carried out.

The operator sits on a comfortable double seat. It is spring-loaded, its position can be easily adjusted to the specific anthropometric parameters of a person. The ergonomic layout of the instrument panel and the thoughtful layout of the control levers - all this eliminates driver fatigue during hard work.

Attachments

For DZ-42, the following attachment can be installed at the customer’s request:

1. BNDT-10 is a fixed blade with a size of 2.52 m and a weight of 0.83 tons. It allows you to change its position relative to the bulldozer chassis within 25°. The device is used for clearing snow on roads and planning construction sites.
2. BNDT-20 is a blade almost identical to the previous version, but has a slightly larger width and weight.
3. The BPDT blade allows you to rotate it relative to the axis of movement of the bulldozer by 25°. The width of the device is 2.8 m, weight is 1 ton.
4. BUDT is the most universal device, since it allows you to change not only the angle of rotation relative to the axis of movement, but also in the cross section. The remaining parameters are similar to the previous model.

All blades provide an equal lifting height of 0.65 m with a maximum depth permitted by the passport of 0.41 m and an effective cutting angle of about 55°. When driving, the machine can be tilted by 20°. Each attachment is controlled by a pair of hydraulic cylinders, and the BUDT requires the installation of three devices.

LLC “Mercator-Service ST” – Bulldozers

Tractor DT - 75 equipped with bulldozer equipment DZ - 42 - with a fixed blade is designed for developing and moving soils of categories 1 and 2, digging and filling trenches, constructing embankments, moving crushed stone and other road construction materials, clearing roads from snow, as well as for performing planning work.

A distinctive feature of bulldozer equipment with a rotating blade is the ability to change the angle of installation of the blade relative to the longitudinal axis of the tractor by ±25°, which allows the unit to be used more productively for clearing roads of snow, backfilling soil, and other earthworks.

The tractor, depending on the configuration, can be equipped with engines: · D - 440 - 22, with a power of 70 kW (95 hp) - Altaidiesel OJSC, Russia; SMD - 18N, with a power of 70 kW (95 hp) - Serp i OJSC hammer", Ukraine; · RM - 80, power 60 kW (80 hp) - Rybinsk Motors OJSC, Russia.

At the customer's request, the tractor can be equipped with a rear linkage, traction coupling devices and a power take-off shaft and can be used, in addition to bulldozers, also for general-purpose agricultural work.

Technical characteristics of the bulldozer DZ-42

Advantages

High-quality maintenance of equipment during long-term operation ensures reliable operation of a bulldozer of any modification. This is a productive unit that, despite its low speed, is able to successfully adapt to the constantly changing situation on a construction site. The machine is constantly subject to critical loads, but successfully withstands them thanks to its robust design.

A significant safety margin allows the DZ-42 to be used even after the specified period has expired, if timely maintenance is carried out. Since most of the mechanism components are unified, they can be quickly replaced. The bulldozer digs ditches well, lays drainage channels, and ensures the construction of embankments.

Thanks to the use of this technology, construction or storage sites can quickly be planned, embankments can be arranged, and excavated soil can be moved to the desired location. After equipping the bulldozer with a mounted ripper, the mechanism is capable of loosening hard rocks.

The main disadvantage is the low speed and obsolescence of this design. Although versatility with sufficient reliability ensures the popularity of the DZ-42 even now.

Pros, cons

The first thing I want to say when describing the positive aspects of the model is its reliability and maintainability. At first glance, these things are incompatible: a solid structure is always complex, and it is more difficult to repair.

The DZ42 bulldozer organically combines simplicity and unification. With proper maintenance, all components will last beyond the standard period, and in case of failure they can be easily replaced, because the machine is suitable for parts from other equipment, which are not difficult to obtain.

Among the shortcomings, machine operators point out low speed, obsolescence of the design and an insufficiently comfortable cabin.

Modifications

After creating the basic model, the plant produced several modifications. They are in undoubted demand even now, differing from the prototype in design and attachment option:

• The DZ-42P modification is equipped with a full-rotary suspension mechanism. This device, using universal joints, is mounted on bars. In the push bar, its rear part is connected to the crossbar by harness joints, which eliminate the risk of loss of performance due to misalignment. At the same time, the design allows the operator to adjust the inclination of the suspension relative to the ground. The modification is available in two types of suspensions: straight or universal bucket.
• The DZ-42T modification has a larger support surface, wider tracks and greater ground clearance. The peat modification freely overcomes tree debris, deep ruts, and other obstacles. The caterpillar has 42 links equipped with special hooks that improve cross-country ability and resist failures in unstable soil.
• The DZ-42G modification is equipped with a hydraulic cylinder operating in two directions. The machines are used for reclamation activities, mining, and where the soil is of medium severity. This variation is equipped with a diesel engine with a power of 90 hp. With. The overall dimensions of the bulldozer are slightly increased.

The main differences of the DZ-42G are presented below:

The lineup

The bulldozer developers have created several modifications that can significantly increase the performance of the unit and expand the scope of its application. The buyer can choose a machine for specific operating conditions.

• Model DZ-42P, equipped with a full-rotary blade mechanism. The rotary blade is fixed on the beams with universal joints. The rear ends of each push bar are attached to a special beam using harness hinges. Thanks to the hinges, the push bar, when a misalignment of the blade occurs, turns, maintaining the functionality of the bulldozer. This allows you to change the angle of the blade relative to the horizontal support axis, which is convenient when clearing areas of snow and performing other specific work. By prior agreement with the customer, the model is supplied in one of two options:
• with a universal rotary mechanism with a hydraulic skew function;
• with a straight rotating mechanism.

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Summary

The DZ-42 model crawler bulldozer perfectly performs its functions in any domestic region. The unit is completely unpretentious in terms of maintenance and is undemanding in terms of fuel parameters.

If there are good technical and operational parameters, the price of the DZ-42 is significantly lower than that of models of a similar class. It is not for nothing that popular wisdom insists that everything new is forgotten old. So the machine, which has long celebrated its half-century anniversary since the production of the first copy, continues to work hard in the vastness of our state.