Eo 4321 specifications - 4321, Kovrovets, 5124, 5122, 3223, 4111, 4112, KrAZ-260 EOV-4422, 2626, 4421, 4224, 5111B, 2202, 4124, 4125, 3523, 3122, prices , reviews

working equipment, specifications, modifications

For carrying out various earthworks, it is necessary to have specialized equipment. This includes the legend of Soviet production - the excavator EO 4321.

Features of the EO 4321 excavator

This model was first made back in 1972 at the Kiev Machine Building. Eo 4321 had all the necessary parameters and mechanisms for carrying out work in the field of agriculture, construction of buildings and transport facilities. This model belongs to the fourth group of specialized equipment.

A distinctive feature of the eo 4321 wheeled excavator model is that this excavator was the first pneumatic wheeled machine with a hydraulic boom. It was he who became the ancestor of subsequent modifications. The unique combination of efficiency and economy in use has contributed to the spread of eo 4321 throughout the union.

This excavator was in service with the engineering troops and worked on almost all construction sites.

The positive qualities of the model include:

• Large bucket capacity;
• Availability of own supporting parts with hydraulic drive;
• Increased productivity by changing the mechanical drive to hydraulic;
• Use of an excavator blade to increase stability;
• Easy access to all elements of the engine and attachments can reduce the cost of maintenance personnel and reduce repair time.

Photo excavator EO 4321

Also, the advantages of the excavator eo 4321 include its versatility. Depending on the work performed, it is possible to attach various equipment to the hydraulic boom. Possibilities include excavation and trenching, well digging, site leveling, and loosening and crushing of hard rock.

Working equipment

The main working body of the excavator is a backhoe, the capacity of which is 0.65 m3. If necessary, you can change the equipment to a straight shovel to excavate the soil above the level of the machine. For the device of deep pits and wells, it is possible to install a grab on the handle. For loading bulk materials, a back or straight shovel bucket is used, and for piece cargo, a special crane installation is used.

The turntable is located on a pneumatic wheeled chassis. Here is the power equipment, driver's cab, tanks for working fluid and fuel, counterweight, hydraulic mechanism and its control system.

Features of the EO 4321 excavator

This model was first made back in 1972 at the Kiev Machine Building. Eo 4321 had all the necessary parameters and mechanisms for carrying out work in the field of agriculture, construction of buildings and transport facilities. This model belongs to the fourth group of specialized equipment.

A distinctive feature of the eo 4321 wheeled excavator model is that this excavator was the first pneumatic wheeled machine with a hydraulic boom. It was he who became the ancestor of subsequent modifications. The unique combination of efficiency and economy in use has contributed to the spread of eo 4321 throughout the union.

This excavator was in service with the engineering troops and worked on almost all construction sites.

The positive qualities of the model include:

• Large bucket capacity;
• Availability of own supporting parts with hydraulic drive;
• Increased productivity by changing the mechanical drive to hydraulic;
• Use of an excavator blade to increase stability;
• Easy access to all elements of the engine and attachments can reduce the cost of maintenance personnel and reduce repair time.

Photo excavator EO 4321

Also, the advantages of the excavator eo 4321 include its versatility. Depending on the work performed, it is possible to attach various equipment to the hydraulic boom. Possibilities include excavation and trenching, well digging, site leveling, and loosening and crushing of hard rock.

EO-4322 hydraulic excavator (technical specifications)

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Technical characteristics of the excavator EO-4322

The main advantage of the hydraulic system of the EO-4322 excavator compared to the hydraulic system of the EO-4321B excavator is the summation of the working fluid flows from both sections of the pump behind the hydraulic distributors using new assembly units (two additional single-spool hydraulic distributors, make-up valves, inlet hydraulic locks, a central manifold). Working conditions for the excavator operator are improved by reducing the maximum noise level through the installation of additional insulation in the cab, as well as by better positioning of controls and the installation of a tipping steering column. In addition, the car has a new efficient and safe heater using the heat of the diesel coolant and a more convenient power window. Along with this, the conditions for starting the engine at low temperatures have been significantly improved by installing a clutch between the pump and the diesel engine. On this excavator, the designs of the running and swivel frames, as well as outriggers, are more rationally made, which increased the support contour, and also reduced the size in the transport position. The bucket capacity of the EO-4322 excavator increased by 20-25%, the depth of digging with a backhoe increased by 7-15%, and the specific fuel consumption decreased by 7%. Backhoe productivity increased by 17%. In addition to forward and reverse shovels, the EO-4322 excavator has the following types of working equipment: a grab with a bucket of 0.63 m3; hydraulic hammer; ripper tooth; hook suspension; attachment drilling equipment; buckets narrow (0.5 m3) and cleaning (1 m3), as well as two profiled (0.63 m3 each).

Excavator EOV-4421 on the chassis of the KrAZ-255B car (technical specifications)

The EOV-4421 excavator is designed for mechanization of excavation and loading and unloading operations when equipping troop positions and command posts. The excavator is used for excavating trenches and pits in soils of categories I-IV without loosening, in frozen soils after their preliminary loosening. The presence of a hook suspension allows lifting, lowering and moving various loads.

Reviews

Experienced excavators who have worked at a construction site for many years speak positively about this machine. You can do a lot with this excavator. Dig trenches. Dig a well with a grapple. Lay pipes instead of a pipelayer. Drive piles with a hammer. Load crushed stone with a grab. With a ripper tooth, break up hard and frozen soil into pieces. Lay concrete slabs with a hook. These machines, fortunately, were made at one time quite a lot.

These machines are remembered, respected, and still work for them.

Be sure to read: Specifications of the EKG 5a excavator

Excavator eo 4321 technical specifications

Universal hydraulic excavator EO-4321B description and specifications

Kyiv in 1988 mastered the serial production of the modernized single-bucket universal hydraulic excavator EO-4321B on pneumatic wheels. The EO-4321B excavator is designed for excavation and loading and unloading operations in urban, industrial, rural and transport construction. The excavator can develop non-frozen soils of categories I-IV, loosen frozen soils, destroy asphalt concrete pavements, load bulk materials and previously loosened rocks into vehicles, as well as perform planning and other work. The main tasks in the modernization of the base excavator are to further increase the productivity of the machine, reduce the specific material and energy consumption, increase the resource and improve the design of assembly units, and improve the working conditions of the driver. For this purpose, the following main design improvements were made on the EO-4321B excavator (compared to the EO-4321A excavator): the SMD-17N engine with a power of 74 kW was used instead of the SMD-15N engine with a power of 59 kW; a backhoe bucket with a nominal capacity of 1 m3 was installed, which has crescent-shaped side cutting edges and an additional hole for attaching a rod in order to increase the cutting force of the soil and improve the conditions for filling the bucket when working at maximum digging depth. This bucket can be used on heavy soils up to category IV inclusive; a bucket hydraulic cylinder with a piston of increased diameter was used to increase the cutting force from 120 to 150 kN; a reinforced boom, stick and backhoe bucket were installed in order to increase the reliability and durability of the basic elements of the working equipment; a new undercarriage with a modified frame (A. S. 1229274 USSR) was introduced to improve the reliability and stability of the excavator, as well as to reduce its overall width from 3.1 to 2.84 m; effective changes were made to the design of the central manifold of the hydraulic system and to the safety valve equipment; to increase the service life of the hydraulic system assembly units, a new filter with paper filter elements of the Regotmas type was installed; to ensure safety conditions, changes were made to the pneumatic system, which increased its speed: the braking distance was reduced from 9 to 6 - 7 m; the design of the cab and service platforms were changed, which significantly improved the working conditions of the driver. As a result of modernization, the technical performance of the EO-4321B excavator has significantly increased. The composition of the replaceable working equipment and working bodies of the EO-4321B excavator includes a backhoe with four buckets, a straight shovel with two buckets, a grab with an extension and narrow jaws, gripping jaws, narrow buckets with a capacity of 0.5 m3 and a cleaning bucket (1 m3), two profile buckets (1 m3 each) with a slope angle of 30 and 45°, hydraulic hammer, ripper tooth, hook suspension. To change the operating parameters, two booms and two sticks of various lengths have been developed.

EO-4321 hydraulic excavator (rarity)

The first serial EO-4321 left the gates of Kyiv in 1972 and, along with the Leningrad and Kalinin (Tver) EO-3322, joined the ranks of the first Soviet hydraulic full-revolving pneumatic wheel excavators. The new Kiev excavator (and its subsequent upgraded versions) belonged to the 4th dimensional group of machines, and the bucket could hold 1-1.2 cubic meters of soil. EO-4321 was intended for excavation and loading and unloading operations in urban, industrial, rural and transport construction. The excavator can develop non-frozen soils of categories I-IV, loosen frozen soils, destroy asphalt concrete pavements, load bulk materials and previously loosened rocks into vehicles, as well as perform planning and other work. The composition of the replaceable working equipment and working bodies of the excavator included several shovels, a grab with an extension and narrow jaws, jaws, grabs, several different buckets, a hydraulic hammer, a ripper tooth and a hook suspension.

In 1983, the Krasny Excavator launched the production of EO-4321A, a modernized version of the excavator, which received a new boom, handle, and a more advanced hydraulic system. This car was awarded the Gold Medal of VDNKh of the USSR. The next upgrade was carried out in 1987, and now the excavator, which received a new engine, became known as EO-4321B. The performance of this machine was 16% more than that of its predecessor with the "A" index. In 1989, the production of a more technically advanced model EO-4322 began, which outwardly was very similar to its predecessor. However, if its serial production took place, then in a very limited batch.

Excavators EO-4321 worked in all the republics of the USSR, at construction sites and in the ranks of the engineering and construction troops of the Soviet Army. Below I want to quote from the article “Atek. Dawn”, found in LiveJournal by user simplyman100500: “in Dzhankoy, a man sat in our compartment, who was going to Kyiv to work, to build a cottage town. The man, unfortunately, did not remember his name, about 50 years old. As it turned out, he was an excavator. Of course, it was a sin not to ask what he thinks about the products of the Red Excavator. After this question, he changed his face, and proudly said: “OOOOO! We grew up on these excavators! ”, After which a long laudatory monologue about the EO-4321 model followed. According to him, in the 70s it was the best excavator in the world (although, it seems to me that he said this rather because of patriotism). True, he had 3 weak points: I don’t remember the first, the second was in the hydraulic hoses, but it was solved quite simply, and the 3rd is the frame. Over time, due to loads, it burst in front of the ring on which the turntable was attached. This was solved by welding the rail into the base of the frame. Otherwise, EO-4321 was virtually indestructible. Also, our casual acquaintance claimed that this excavator can still compete even with modern models in terms of performance and reliability. Especially in extreme conditions."

Excavator EO-4321

The EO-4321 was one of the most sought after construction machines in the 1970s and 1980s.
At that time, up to 35% of all excavators assembled in the Soviet Union were products of Kyiv, and the EO-4321 model was considered the most popular, "indestructible" and durable among them. At the same time, the equipment was the first representative of a new family of hydraulic excavators with the ability to rotate the body around its own axis by 360 degrees and pneumatic wheels. Due to its versatility, this model quickly spread throughout the regions of the USSR. Almost in all republics of the country they worked on EO-4321.

The debut copy of the car rolled off the assembly line in 1972. The technique turned out to be universal and convenient, but it also had certain disadvantages. Hydraulic hoses began to leak after a short period of use, and the frame at the base of the turntable was rather weak and could not always withstand heavy loads.

Video

The model was used to work with non-iced soils belonging to categories 1-4 (unloading, moving, dispersal and development). The excavator worked well with icy soils of category 5 and above and stony rocks. However, they first had to be crushed into pieces 40 cm long. EO-4321 felt great under temperature conditions from -40 to +40 degrees.

The excavator belonged to the 4th dimensional group of machines and was widely used in transport, industrial, urban and rural construction, as well as in loading and unloading and earthworks.

In 1983, the basic version of the EO-4321 underwent a major upgrade. began to produce a modification of the EO-4321A with an old engine and an increased volume of a backhoe. The upgraded version has a more reliable hydraulic system. The production of EO-4321A lasted three years. In 1986, the excavator received an improved engine. The model was soon discontinued. It was replaced by the EO-4321B version, the technical parameters of which were changed almost beyond recognition. However, even the updated version was noticeably inferior to the best foreign analogues. As a result, in 1989, the production of EO-4321B ceased. "Red Excavator" started production of modification EO-4322.

Specifications

The debut EO-4321 had a mass of 19.8 tons and an 80-horsepower engine. The excavator was equipped with a frontal bucket with a capacity of 0.63 cubic meters and a 0.5 cubic meter backhoe. The digging radius was 8900 mm, the maximum digging depth was 5500 mm. The model was designed to work with soil and unload it at a radius of 7160 mm and a height of 5600 mm.

The dimensions of the EO-4321 were quite large.

• The length of the equipment was 9900 mm,
• Width - 2840 mm,
• Height - 3990 mm.
• The digging force for this modification was 150 kN,
• Load capacity at the maximum reach - 2000 kg.
• The excavator could move at speeds up to 20 km / h, which significantly increased its maneuverability.
• The turning radius of the model is 7300 mm.

In the EO-4321B modification, the frame was reinforced and the design of the backhoe and boom was strengthened. At the same time, the length of the excavator became smaller.

Fuel consumption

The specific fuel consumption of EO-4321 is no more than 210 (155) g / kW per hour (g / hp per hour), and the fuel tank holds up to 320 liters.

Working equipment

The main working body of the excavator is a backhoe, the capacity of which is 0.65 m3. If necessary, you can change the equipment to a straight shovel to excavate the soil above the level of the machine. For the device of deep pits and wells, it is possible to install a grab on the handle. For loading bulk materials, a back or straight shovel bucket is used, and for piece cargo, a special crane installation is used.

The turntable is located on a pneumatic wheeled chassis. Here is the power equipment, driver's cab, tanks for working fluid and fuel, counterweight, hydraulic mechanism and its control system.

Excavator device EO 4321

The running structure consists of a solid frame and pneumatic wheels. Special supports and bulldozer-type equipment are installed on the frame. Management is carried out by turning the front axle.

Engine

The EO-4321 excavator is equipped with a 4-stroke 4-cylinder diesel engine of the SMD-17N model with liquid cooling and direct fuel injection. These units were manufactured at the Kharkov enterprise "Hammer and Sickle". The engine is started by means of an electric starter.

Engine parameters "SMD-17N":

• working volume - 6.3 l;
• rated power - 58.8 (80) kW (hp);
• rotational speed - 1950 rpm;
• motor weight - 680-735 kg;
• cylinder diameter - 120 mm.

Design features

All-wheel drive excavator EO-4321, the elements of which are made of high-strength steel and materials, gave tangible results in improving power qualities. Its durability is characterized by distinctive features:

• rigid welded frame structure, with installed hydraulic outriggers and bulldozer-type equipment;
• the use of a controlled pneumatic wheel running gear with wide-profile wheels and a front-wheel drive axle;
• installation of a hydraulic unit with a tank of 320 liters on the turntable of the excavator and the use of a double axial piston pump;
• safety system with safety valves that maintain pressure in working cavities up to 320 MPa.

Technical data

In terms of operational capabilities, the EO-4321 excavator whose technical characteristics remain at the level of modern analogues of bulldozer equipment, and now occupies a worthy niche in the consumer market. The power reserve of the excavator diesel power unit of 80 hp provided sufficient performance indicators:

• the mass of the unit is 20 tons and 4 hydraulic supports make the excavator stable at a digging depth of 5.5 and a radius of 8.9 meters;
• movement to the place of work is carried out at a maximum speed of 20 km / h with a turning radius of 7.3 meters;
• the width of the EO-4321 bucket, depending on the type of installed handle, is 0.8 meters, 1 or 1.2 meters;
• depending on the width of the excavation and the type of bucket used, the operational performance of the excavator ranges from 29.4 to 43.4 cubic meters / hour;
• the liquid cooling system of the engine of the unit and the design of the hydraulic system make it possible to operate it in critical climatic conditions.

The base model of the excavator is equipped with a bucket of 0.65 cubic meters. m and a bulldozer device.

Auxiliary equipment

The versatility of the excavator lies in the ability to supplement the main elements of the excavator EO with two dozen types of additional equipment. To develop various types of soil, the excavator is equipped with a stick of a normal and extended type or with an offset of the upper part of the boom.

For breaking hard or frozen ground, backhoe equipment with a normal handle can be equipped with a ripper tooth and a hydraulic hammer. The productivity of the excavator when loosening is 50 cubic meters. m/hour. The excavator is also quite effective with attachments for drilling equipment. For digging pits, clamshell equipment with two jaw buckets with a capacity of 0.65 cubic meters is installed on the unit. m with a change in the angle of inclination to the surface.

The expansion of the range of interchangeable working equipment used is due to the presence of a reliable hydraulic drive.

It expands the efficiency of the device by 1.5-2 times and increases the productivity of the machine by 30-35 percent.

Device

EO-4321 is equipped with a profile bent chassis frame. On the rear beam there are special outriggers operating from a hydraulic drive, which greatly facilitates the work of equipment in difficult conditions. The front axle of the excavator, which is the leading one, is suspended in front of the frame on special hinges. The front wheels are steerable and are 3-5 closer than the rear ones. The equipment is equipped with a non-mechanical transmission with a main gear in the form of bevel planetary gearboxes. Due to the fact that the force on the wheels is supplied directly from the hydraulic motor, the process is noticeably accelerated. In addition, this solution helps to effectively control the traction force and the speed of the equipment.

Supercharging and braking system EO-4321 operate from a pneumatic actuator. The excavator is equipped with wide-profile pneumatic tires (1300 mm). The hydraulic system of the equipment is mounted on a turntable and includes a dual axial piston pump, safety and distribution valve equipment, a hydraulic slewing drive and a tank. The pressure in the hydraulic system is maintained at 320 MPa. A long-stroke piston is installed in the hydraulic cylinder, which made it possible to increase the cutting force.

Excavator device

There is a cabin for the operator, in which there is everything for control. The undercarriage is equipped with a frame with a turntable. There are outriggers. Before work, they are strengthened and pumped up through hydraulics. For the stability of the machine during operation. The transmission is not mechanical. Transmission is carried out through planetary gearboxes. Drive axle - front. He's on the balls. Steering wheels - front. Tires wide profile: 1300 mm. Hydraulics is located on the platform, consists of a pump, valve equipment, a tank and mechanisms that drive the hydraulics. Moreover, the hydraulic system has its own distributor.

The hydraulic cylinder has a piston that helps to make an effort on the ground during operation. The boom has its own hydraulic system. The bucket, too. There is a bulldozer blade with its own hydraulic system. The bucket hydraulic cylinder has a relief valve. The platform, along with the boom and operator's cab, can rotate on the turntable in any direction, depending on what the operator needs. In small faces, it is good to work with a straight shovel. It is better to load large fragments with a ladle in the form of a lattice. For example, large rubble stones.

The most popular Soviet excavator EO 4321

There are things in the life of any person on which he grew up, which he associates with childhood, with his native city and native country. In the life of Soviet boys in the 60-80s, there were MAZ trucks, Sitro, Orlyonok and EO 4321 excavators.

Do you think it's an exaggeration? See for yourself. Every third excavator in the Soviet Union was produced on the once super-popular Red Excavator. In turn, the factory workers themselves have repeatedly admitted that it was EO 4321 that was the most durable, most passable and most “indestructible”, it was not for nothing that at one time it was he who was depicted on the layout in front of the gates of this Kiev plant. But most importantly, he was the first of his kind. The first hydraulic excavator with pneumatic wheels and the ability to rotate 360 ​​degrees around its own axis.

Operating characteristics of the excavator

The first excavator EO 4321, with a total weight of 19.8 tons, rolled off the factory assembly line in 1972. It was equipped with an SMD-15N engine with a power of only 80 horsepower (at a crankshaft rotation speed of 1800 rpm), a backhoe with a capacity of 0.5 cubic meters, and a frontal bucket with a capacity of 0.63 cubic meters. The maximum digging depth of the excavator was 5.5 meters with a digging radius of 8.9 meters.

The EO was designed to work with non-icy soils of categories 1-4, their development, movement, dispersal and unloading at a height of 5.6 m. and at a radius of 7.16 m. The excavator worked quite well with rocky rocks, icy soils of category 5 and above - by crushing them into segments up to 40 cm wide. The operation of the excavator was possible in conditions from +40 to -40 degrees Celsius.

If necessary, instead of a backhoe, it was possible to install a straight shovel with a capacity of 0.8 cubic meters with a digging radius of 7.5 meters, a height and an unloading radius of 5.67 m, respectively. and 4.9 m. In addition to the straight shovel, there are 20 more types of additional equipment for EO 4321. Among them are narrow buckets, profile 90 and 120 degrees, cleaning, general purpose buckets with a capacity of 0.8 m3, 1 m3 and 1.25 m3, as well as hydraulic hammer, hook suspension, ripper tooth, hard, narrow grabs, with extension, with jaws-grabs, attachment drilling equipment, etc.

The hydraulic system of the excavator is located on a turntable. It consists of a tank with a capacity of 320 liters, a double axial piston pump, distribution and safety valve equipment, as well as a hydraulic rotation drive. The pressure in the hydraulic system is maintained at 320 MPa.

The chassis frame of the EO 4321 excavator is bent, profiled. On the rear beam there were special outriggers powered by a hydraulic drive. This makes it easier for the excavator to work in difficult conditions. The front axle is suspended in front of the frame on hinges. Front axle wheels are 3-5 mm. closer than the rear wheels. The front axle is leading, and the wheels are steerable.

The transmission of EO 4321 is non-mechanical, the main gear is in the form of bevel planetary gears. The wheels are driven directly from the hydraulic motor to the wheel, which significantly speeds up the process, allows you to more accurately control the speed and traction. The maximum transport speed of the excavator is 19.5 km/h, and the turning radius is 7.3 meters. The brake system and pressurization work from a pneumatic actuator. Pneumowheel tires - wide profile, 1300 (530-533) mm.

In general, the excavator was so versatile and convenient that it spread throughout the USSR in a very short time. True, they had their drawbacks, which include a weak frame at the base of the turntable and leaking hydraulic hoses. If the hoses were easily changed, then the frame had to sweat, although this was also solved by welding an additional beam or rail to the main profile. At the end of the 70s, 4321 was put on a caterpillar to simplify work in quarries and received the index 4123. The model was successfully tested, but it entered the assembly line only at the end of the 80s due to the unsuitability of the Red Excavator's production facilities for the production of caterpillar tractor-type carts.

Universal hydraulic excavator EO-4321B (technical specifications)

zinref.ru

The model had several modifications

Simultaneously with the caterpillar variation, engineers began to improve the base model, so in 1983 the EO 4321A appeared, still working on the old SMD-15N, but with an increased backhoe volume - 0.63 versus 0.5 m3, an increased handle length of 3.15 m instead of 2.93 m on the base model. The digging depth has also increased: 6m. with a turning radius of 9.3 m. The unloading height also increased by 10 cm. Similarly, the parameters have changed for all types of spare parts EO 4321A. Among other things, the hydraulic system has become more reliable due to the installation of working hoses with a long service life.

The excavator model EO 4321A was produced for three years and during this time it was awarded the first place at the VDNKh competition of the USSR. Closer to 1986, the excavator was equipped with a more powerful 99.25 strong SMD-17N. The removal of the model from production was due to the release of a new upgraded version with the index 4321B.

Unlike version A, the technical characteristics of the EO 4321 have been changed almost beyond recognition. Here is the new SMD-17N engine, and a large operating weight (20.4 tons), and an increase in the volume of the backhoe right up to 1 cubic meter. In addition, the backhoe received a sickle-shaped cutting edge on each edge, a hole for placing the load.

In the hydraulic cylinder, the piston was replaced with a longer stroke one, which made it possible to increase the cutting force by 30 kN. The design of the boom and backhoe has been further strengthened, and the frame has become more durable. The length of the excavator became 26 cm shorter. Filters were replaced in the hydraulic system, and the pneumatic system was made faster, which reduced the stopping distance of the machine by 2-3 meters. In general, the 4321B model has become more productive and more comfortable than previous versions.

The production of the 4321B excavator continued until 1989, until it was replaced by the more progressive model 4322, but that's a completely different story.

Advantages and disadvantages

The versatility of the machine was that it was possible to attach the necessary equipment for work to the hydraulic hinged system, and then remove it. The backhoe can be changed. There are several of them, with different sizes. In addition, this main working tool could be detached, replaced with a grab, jaw-grabs, a slotting hammer, a ripper tooth. The machine works in 40% frost (with non-icy soils), and in 40% heat. It should be noted the efficiency, efficiency of the excavator. Despite numerous advantages, this machine had disadvantages . Hydraulic hoses leak when serviced for a long time. When working excessively with great effort, the swivel frame could burst.

Excavator EO 4321 in operation

The model of the fourth group of specialized equipment worked (and continues to work) in agriculture, transport, and construction. In the army, the machine was previously used in the technical troops. But the technical characteristics of the EO 4321 were inferior to Western machines of this type. Therefore, in 1983, the car was modernized, model "A" began to be produced. The engine was left the same, and the volume of the backhoe was increased. Improved hydraulics. 3 years after the start of production, in 1986, the model "A" was discontinued. The production of EO 4321B, an even more improved machine, began. It differed greatly in its characteristics from the previous two models. The motor was replaced, the shovels were improved, the swivel frame was made stronger so that it would not break when overloaded.

Be sure to read: Excavators EO 3323 and EO 3323a

But, since even an improved machine was inferior to Western similar technology, in 1989 EO-4322 began to be produced. After the collapse of the Union, the Kiev one was renamed into Atek CJSC. Model EO-4322 was modernized. Atek 4321 began to be produced, according to the nomenclature classification of the renamed plant, and so it is considered as model 4321B, because it absolutely repeats all the characteristics of the machine of the 80s. The only difference from the previous model is that they made a different diesel engine, and the hydraulic motor is installed at the top of the platform, and not at the bottom. This excavator was produced throughout the 90s. It can be recognized by the characteristic yellow and red color of the coating. Now the release of this machine is in question. The bankrupt plant has not been operating for several years. And the famous excavators of the 70s and 80s can be bought used. They are still successfully working throughout the territory of the former Soviet Union, including in Russia. Now the analogue of this machine is the Russian EK-18.