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EO-2621A excavator based on YuMZ-6L tractor (technical specifications)

description and specifications

A strapping frame and a bulldozer frame are attached to the tractor, reinforcing the tractor frame. A swivel column is installed on the strapping frame. The turning mechanism consists of an asterisk mounted on a shaft and a chain covering it, which is driven by two hydraulic cylinders. Thus, the column can be rotated with the working equipment around the vertical axis at an angle of 160 hail. To increase the stability of the excavator in operation, outriggers driven by hydraulic cylinders are attached to the strapping frame. The bulldozer blade serves as a counterweight, and when working with excavator equipment, it serves as an additional support. The drive of the working equipment (boom, arm and bucket) is also hydraulic.
The excavator uses two independent hydraulic drives with a common tank for working fluid. The first one drives the hydraulic cylinders of the boom, arm and bucket with the help of gear pumps and a distributor. The second drive is responsible for the hydraulic cylinders of the turning mechanism, as well as for the outriggers and bulldozer equipment. All hydraulic cylinders installed on the excavator are piston type, double-acting.
The working equipment includes front and back shovels with a unified bucket and a bulldozer. The excavator can also be equipped with interchangeable equipment of a grab, a crane, a hydraulic hammer, a bucket with an increased volume and a pitchfork. When converting an excavator from a backhoe to a straight one, the bucket, turned outward with teeth, is rigidly attached with additional rods to the end of the handle, and the hydraulic cylinders of the handle to its lower bracket. The bucket bottom is pivotally connected to the body and opens for unloading by the bucket hydraulic cylinder.

Technical characteristics of EO-2621A

Basic Tractor	UMZ-6L
Engine	D-65N
Power, kW	41,5
movement speed, km/h	1,9 - 19,0
climbable path, hail	10
Base, mm	2450
wheel track, mm:
.. front	1460
.. rear	1550
tire size, inch
.. front	6,5 - 20
.. rear	15 - 30
Tire pressure, MPa	0,17 - 0,18
cab height, mm	2460
Clearance under the bottom cart, mm	450
The highest pressure in the hydraulic system, MPa	7.5 and 10
Backhoe excavator weight, T	5,7

EO-2621 excavator parameters during operation:

	straight shovel	backhoe	hook suspension	pitchfork
bucket capacity, m3	0,25	0,25	---	---
Soil category	I-III	I-III	---	---
dig radius, m	4,7	5	---	---
unloading height, m	3,3	2,2	---	3,3
digging depth m	---	3	---	---
Kinematic dig height, m	4,7	---	---	---
Maximum force on the cutting contour (teeth), kN	25	26	---	---
The duration of the working cycle, With	15	18	---	---
lift height, m	---	---	3,8	---
load capacity, T	---	---	0,5	0,4
Departure at the highest lift height, m	---	---	2,3	---

GRANTEK XX1 LLC presents the EO-2621 excavator. This technique successfully combines reliability, versatility, versatility, mobility and low cost of operation. It is ideal for use in geographically remote facilities for various purposes. The 4x4 all-wheel drive formula makes it suitable for operation in almost all regions of the Russian Federation and neighboring countries.

The EO-2621 single-bucket part-turn excavator is mounted on the chassis of the MTZ-82 "Belarus" or YuMZ-6L wheeled tractors. This is the direct predecessor of the E-2515 model. The most modern version of the EO-2621 excavator has the B-3 index and is distinguished by an expanded cab with increased visibility, a hydraulic drive of the boom column (previously it was a chain one) and cavitation valves that exclude gusts of pressure hoses.

Characteristics of the EO-2621 excavator based on MTZ-82 "Belarus":

• operating weight: 6.3 t;
• length: 7.7 m;
• width: 2.4 m;
• height: 2.78 m;
• engine power: 59.6 kW;
• maximum digging radius: 5.3 m;
• minimum turning radius in transport position with attachments: 6.3 m;
• maximum digging depth: 4.15 m;
• productivity: 40 m3/h;
• angle of rotation of the working tool: 160°;
• loading height: 3.8 m;
• cutting force into the ground: 26 kN with a backhoe and 25 with a straight one;
• cycle time at maximum digging depth: 25 seconds with a backhoe and 18 seconds with a straight shovel;
• pressure in the hydraulic system EO-2621, limited by safety valves: 7.5 MPa (bulldozer) and 10 MPa (excavator);
• gradeability on dry hard ground: 13°.

What does the EO-2621 excavator consist of?

The design of this technique includes:

• tractor chassis;
• dozer blade;
• strapping frame and bulldozer equipment frame;
• fuel tank;
• hydraulic system;
• pump group;
• cabin;
• hydraulic system tank;
• turning mechanism;
• handle;
• ladle;
• arrow;
• distributors;
• connecting pipelines;
• turntable;
• outriggers.

It is possible to install 22 excavator and bulldozer working bodies on the standard suspension of the EO-2621 excavator, including:

• standard bucket;
• backhoe with an offset axis (allows you to dig a ditch close to the walls of buildings);
• narrow trench bucket;
• pitchfork;
• bucket of increased volume;
• capture;
• hydraulic hammer;
• loading bucket;
• ripper tooth;
• crane hook;
• grabber and others.

Scope of excavator EO-2621

This versatile technique is used for the following purposes:

• digging pits, trenches, wells;
• loading bulk materials and other cargo weighing up to 400 kg into transport;
• cleaning and leveling roads, construction sites;
• territory planning;
• falling asleep trenches;
• raking construction debris;
• soil dumping;
• embankment erection;
• face development;
• pole installations;
• laying pipes, cables;
• uprooting small stumps;
• opening of concrete coverings;
• crushing stone, frozen soil;
• snow clearing.

Excavator EO-2621 has increased functionality. Due to this, it is used in the municipal and agricultural sectors, the construction industry, energy, industry and other sectors of human activity.

Features of the excavator EO-2621

The design of this technique provides for 2 independent hydraulic systems with one tank for the working fluid. The first one drives the working equipment from 3 NSH32-3 gear pumps. Fluid is supplied through a distributor to the arm, bucket and boom cylinders. The second hydraulic system is responsible for the operation of the outriggers, the slewing mechanism and the bulldozer. All pumps operate from the engine crankshaft through a reduction gear.

The dozer blade also serves as a counterweight. To increase stability, the EO-2621 excavator is equipped with outriggers. Management is made from a cabin by means of hydrodistributors. The bucket rotates relative to the lower hinge of the arm.

In order to limit the pressure in the piston cavity of the hydraulic cylinder, an unloading valve is provided that bypasses the working fluid into the rod end of the cylinder, and the excess into the tank. Smooth braking is provided by special damping devices.

Operational advantages of the EO-2621 excavator:

• economy, low fuel consumption;
• simplicity and convenience of control (levers are mounted on both sides of the cab and are at arm's length);
• reliability, unpretentiousness, maintainability;
• reinforced strapping frame;
• availability and low cost of spare parts and consumables;
• operation in a wide temperature range (from –40 to +40 °C);
• high power hydraulics;
• modern diesel power unit DT-65N with a 9-speed gearbox;
• productive ventilation system with a heater;
• ergonomic and spacious cab with a wide viewing angle and a swivel operator's seat;
• quick tool change by two people directly at the workplace (the process takes about 20 minutes);
• increased maneuverability and small size.

All these qualities ensure the demand for the EO-2621 excavator.

Model EO-2621 is an excavator with a bulldozer bucket based on the YuMZ-6AL/AM Belarus tractor.

The EO-2621 excavator is made on the principle of a "workhorse" - universal, unpretentious, cheap and economical. It is this special equipment that is required to perform relatively small amounts of work at remote sites in construction, industry or agriculture.

Based on these considerations, the technical characteristics of the EO-2621, which belongs to the 2nd group of excavators, are combined with low fuel consumption. This is important, because such special equipment must constantly move from one object to another. Equally important are good cross-country ability, reliability in operation and simple operation. As well as high maintainability in the field.

The idea to mount attachments on a light YuMZ-6 tractor turned out to be successful. This model, in the presence of a small economical 65-horsepower engine, has a significant grip weight, which has a positive effect on driving performance. True, the tractor, in its standard modification, was not intended to be used as a chassis for special equipment. The problem was solved by an additional strapping frame.

As a result, the coupling weight increased to 6.1 tons, it became possible to use a non-removable dozer blade in the form of a support. The boom of the excavator bucket is fixed on a special column, so its angle of rotation is 160 degrees.

It should be especially noted that the issue of quick and easy replacement of working bodies has been resolved at EO-2621. Thanks to its universal shape, the bucket can be used not only as a backhoe, but also as a straight shovel. The operator with an assistant performs the replacement right at the workplace in 20 minutes. To do this, just put the bucket on the ground, disconnect it and turn it so that the earring turns 180 degrees. After that, the hydraulic cylinder is transferred to additional brackets located on the handle. That's all!

In addition to the bucket supplied as standard, EO-2621 can work with 22 other interchangeable working bodies. The most commonly used include an enlarged bucket, a gripper, a fork, a narrow trench bucket, a crane hook, a reverse offset shovel (with its help they dig trenches near buildings), a ripper tooth, a loading bucket, several different grabs.

But the main assessment of the quality of EO-2621 was given by consumers. In numerous positive reviews, it is noted that this is a reliable and economical bulldozer-excavator, easy to repair and manage, with an easy-to-start engine, inexpensive to buy and operate.

As an illustration, a typical example can be given. A villager, not a tractor driver or an excavator by profession, purchased an EO-2621 made in 1991, that is, to put it mildly, very second-hand. Plus, the car was leaking hydraulics. The man put the special equipment in order on his own (!), to the point that he made new teeth for the bucket from the unusable rods of the hydraulic cylinders, instead of the worn ones. The new hydraulic pump NSh-100 cost 35,000 rubles. (!). This bulldozer-excavator dug several ponds in category III soil, after which it continues to work successfully. For six months, the car fully paid off all the costs!

At EO-2621 the first issues of the hydraulics "tore". Similar complaints were received on the chain drive for turning the boom. After the Italian hydraulic drive and anti-cavitation valves were installed on the equipment, the complaints from the professionals stopped. Not very competent owners, for whom the EO-2621 literally works “for slaughter”, however, are also not going to change it to a similar technique. Instead, they ask how to repair it.

Technical characteristics of the EO-2621 excavator

• Type: universal bulldozer-excavator, on a pneumatic wheeled chassis, 2nd size group.
• Purpose: loading and unloading, incl. semi-liquid or viscous rocks; development of soils of categories I - III (without loosening), category IV and frozen soils (with preliminary loosening), as well as quarries; territory planning; construction and agricultural work.
• Productivity, cu. m. per hour: 40
• Digging depth, m: 3
• Digging radius, m: for a straight shovel - 4.7; for reverse - 5.0
• Loading height, m: backhoe - 2.2; bucket, pitchfork or straight shovel - 3.3
• The volume of a standard bucket, cu. m: 0.25
• Cutting force, kN: backhoe - 26, straight - 25,
• Maximum duration of the working cycle, sec: backhoe - 18, direct - 15
• Lifting capacity (hook), t: 0.5
• Working pressure in a separate hydraulic system, MPa: for an excavator - 10; at the bulldozer - 7.5
• Hook lifting height, m: 3.8
• Boom reach at maximum lifting height, m: 2.3
• Engine (power, hp/kW): DT-65N (65/41.5)
• The highest speed, km / h: 19
• Maximum track width (on rear wheels), mm: 1550
• Clearance, mm: 450
• Maximum slope, hail: 10
• Transport dimensions (DShV), m: 6.48 x 2.2 x 3.8
• Total weight with working bodies, t: 6.1

Conclusion

Reading the above description and performance data, it is easy to draw the following conclusion. EO-2621 does not have any exceptional abilities. Yes, he doesn't need it. The machine is designed for daily routine work. And she does her job well.

Video: Rental of special equipment and cargo transportation services without intermediaries!

In some types of work, it is necessary to use excavator and bulldozer equipment, but due to the rather large dimensions and weight, these machines cannot be operated in hard-to-reach places with different soil structures. Therefore, for doing such work, the excavator-bulldozer EO-2621 was developed. This machine uses the base of the Minsk-made tractor, namely MTZ-82.1 and the YuTZ-6AL tractor. This resulted in a machine endowed with special equipment, which is capable of performing the necessary tasks of agriculture, forestry and construction in various soil and climatic conditions. The excavator-bulldozer EO-2621 is equipped with a diesel engine of the D-243 brand, capable of developing a maximum power of 80 horsepower, but there are also versions with a power unit with a capacity of 60 horsepower. The first models released performed well and received a lot of positive feedback about this machine due to its high flotation, maintainability, low cost, maintenance and capabilities of heavier machines. The excavator-bulldozer EL-2621 itself is a representative of the second dimensional group of special equipment.

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Purpose

Excavator EO 2621 is designed for land and many other works in agriculture, forestry, utilities, as well as in construction. This machine performs the following: digging trenches and backfilling them, loading work, some assembly, demolition (using a hydraulic hammer instead of a bucket), leveling the site, clearing the working area and road sections from snow retention, loading and unloading various vegetation (silo, hay and many others ).

Attachment

The excavator-bulldozer EO 2621 uses both standard (factory) attachments and a variety of other equipment, which allows the machine to expand the range of tasks performed. This technique uses the following attachments:

• Front dump.
• Rear side hydraulic struts, giving the excavator high stability when doing digging work.
• Hydraulic manipulator.
• Ladle. The volume is 250 cubic centimeters.
• Grab forks.
• Hydraulic hammer NM-120, which is installed to the manipulator.

Modifications

For all the years of production, this machine has not received modified versions related to EO-2621. Since all the released versions are a deep refinement, respectively, they are released in the form of new models, namely EO-2626 and others.

Specifications

Excavator EO-2621 has an operating weight of 6300 kilograms. The length of the entire structure, taking into account the front bucket and the manipulator, is 7700 millimeters. The width calculated with the edges of the wheels of the rear axle shafts is 2400 millimeters. The minimum turning radius with attachments installed is no more than 6 meters. The machine can overcome a slope that is at least 13 degrees. The ground clearance of the excavator, taking into account the frame of the front attachments, is 190 millimeters. The nominal pressure in the hydraulic system, limited by the safety valves of the hydraulic distributors, has a value of 16 megapascals. The entire hydraulic system holds about 20 liters of fluid.

The gripping width of the dozer blade is 2290 millimeters. The maximum bucket capacity is 280 cubic centimeters. The bucket has a width of 580 millimeters. The maximum digging depth is 4150 millimeters. The maximum digging radius is 5200 millimeters. The maximum height at which unloading can take place is 3500 millimeters. If necessary, the hydraulic hammer NM-120, which has a frequency of 720 beats per minute, can be installed to the manipulator. Each blow of this hammer has an energy of 500 joules.

The excavator-bulldozer EO-2621 is equipped at the plant with a diesel four-cylinder power unit of the D-243 brand. Its rated power reaches 80 horsepower (60 kilowatts). It also has a torque of 290 Nm.

A manual gearbox is installed, equipped with a special gearbox, thanks to which the number of available gears doubles. The gearbox of the excavator has 18 gears for forward movement and 4 gears for reverse movement of the excavator. On a flat and straight surface, EO 2621 can develop a maximum power of 34 kilometers per hour.
The steering of the machine is of a hydrostatic type, which allows you to make a turn without much effort and delay.

Peculiarities

Excavator bulldozer EO-2621 is able to work in hard-to-reach places for other heavy and large equipment. Since it has a small weight and dimensions for working machines, and at the same time it is able to perform all the necessary work, like other excavators and bulldozers. Also, its long-distance maintenance, in comparison with the above mentioned equipment, will not cause large cash costs. When various malfunctions of the EO-2621 mechanisms appear, thanks to a simple design, you can easily and quickly find the cause, and then fix all the problems, without having to drive the car for lengthy repairs.

The excavator cab is equipped with a heater and a system for filtering and heating the incoming air into the cab, which makes it possible to operate the machine in various weather conditions while maintaining favorable conditions for the operator inside the cab. The large glass area provides a fairly wide view of the surrounding area from all sides, which allows the operator to perform precise actions. The rear window can be opened if necessary.

Video

Engine

The excavator-bulldozer EO-2621 is equipped with a four-cylinder power unit of the D-243 brand, the maximum power of which is 80 horsepower or 60 kilowatts. The maximum torque that this unit can develop is 280 Nm. This engine runs on diesel fuel. The torque margin factor is 15 percent. All cylinders of this unit have a diameter of 110 millimeters. The piston stroke is 125 millimeters. The crankshaft can develop a maximum number of rotations of 2200 rpm. The mass of the assembled engine is 430 kilograms.

But the excavator model based on the YuMZ-6AL and YuMZ-6AM tractors has a slightly weaker engine. Its rated power is 60 horsepower or 44 kilowatts.

Price of new and used

As described earlier, this machine has a fairly low cost, both for a new version and for a used one. On sale, a new car is available at a price of 500 thousand to 800 thousand Russian rubles, when the cost of supported equipment starts from 100 thousand and ends with 450 thousand Russian rubles. The cost for both options may vary depending on the year of production, version (on what basis the EO 2621 was designed) and the general condition of the machine (if this is, of course, a supported version).

The EO-2621 hydraulic earth-moving excavator, commonly known as the Cockerel, is used for loading or excavation work. The design of the single-bucket boom allows you to mount interchangeable equipment (loading buckets, crane suspension, grab, hydraulic hammer, etc.).

Modifications

Excavators differ in the type of base chassis, place of production and features of the column mechanisms:

1. An early version of the excavator had the designation 2621A, was built on the basis of the YuMZ-6 and 6A tractors (late series). The release was carried out in the first half of the 70s by several enterprises. On machines, a bucket with a folding bottom was used. The unlocking and locking was controlled by a hydraulic cylinder.
2. Model EO-2621 V, which uses the YuMZ-6A wheeled tractor as a basis. There is a dozer blade on the front of the machine. The excavator boom is designed to work with a front and back shovel. The bucket volume in the standard version is 0.25 m³. The cars were produced by enterprises located in Zlatoust, Saransk and the village of Borodyanka (Ukraine).
3. The modernized excavator EO-2621 V 2 is distinguished by the installation of a bucket with a reinforced and optimized design. The hinged bottom was removed from the circuit, which made it possible to increase the resource of the node. The modified bucket drive mechanism increased the angle of rotation of the working element. The excavator boom has an increased length, which makes it possible to increase the digging depth to 4.15 m. The YuMZ-6L or ZTM-60L tractor (late releases) is used as a base. The assembly was carried out in Zlatoust, Saransk, Borodianka and Omsk.
4. The EO-2621V 3 excavator is distinguished by the use of a lever mechanism for turning the boom driven by hydraulic power cylinders. Previously, a chain reducer was used for this. The equipment was assembled in Saransk and Borodyanka.

Specifications

Technique parameters:

• weight - 5700-6300 kg (depending on modification);
• productivity - 40 m³ / hour;
• force on the bucket - 25-26 kN;
• soil lifting height with a straight shovel - 3.3 m;
• height of soil lifting with a backhoe - 2.2 m;
• lifting height (with installed hook suspension) - 3.8 m;
• boom load capacity - 500 kg;
• length - 6480 mm;
• width (with raised supports) - 2200 mm;
• height (along the cabin roof) - 2460 mm;
• height (up to the top point of the boom in the transport position) - 3800 mm;
• ground clearance (the lowest point is the support column subframe) - 450 mm.

See » Technical characteristics of the advantages and disadvantages of the single-bucket excavator EO-2101

According to its technical characteristics, the EO-2621 excavator is in demand among small construction organizations that need to dig trenches for communications, build embankments, dig ponds and small pits. The base chassis is equipped with rear-wheel drive. But there are excavators built on the basis of all-wheel drive tractors.

Engine

The excavator chassis is equipped with a diesel atmospheric engine with a power of up to 85 hp. The diesels are equipped with a mechanical transmission and a demultiplier, allowing speeds up to 20 km/h on the highway. The transmission includes a differential equipped with a lock. Due to this, the excavator is able to overcome impassability. The steering, equipped with a hydraulic booster, is identical to the basic chassis of the tractor.

Fuel consumption

Fuel consumption depends on loads, engine condition and ambient temperature. According to the factory documentation, the excavator consumes from 6 to 12 liters of diesel per hour. The standard fuel tank holds 100 liters of liquid, which ensures autonomous operation of the machine during the working shift. A feature of the excavators is the relocation of the fuel tank to the front of the machine, which provided improved conditions for mounting and servicing the boom.

Hydraulic system

The drive of the working body of the excavator is hydraulic, the hydraulic system diagram includes a gear-type pumping station, a distributor, lines and slave cylinders. The fluid supply is located in a tank mounted on the side of the chassis (next to the engine). The early-type pumping unit includes pumps that develop a working pressure of up to 10 MPa. On the late version of EO-2621V3, the pressure was increased to 20 MPa, which improved the performance.

The pumps are powered by a diesel crankshaft, the performance depends on the speed. Hydraulic cylinders piston, 2-sided action. Liquid distribution is performed by spool devices mounted on the rear inner wall of the cab. Hydraulic interlocks are installed in the blade and support drives to prevent fluid from escaping and increase the stability of the excavator.

The hydraulic circuit and control devices of early and late production machines have differences. On late technology, 2-circuit hydraulics are used. The first circuit provides the operation of the boom, and the second - the dozer blade. The second hydraulic system is connected to the regular hydraulics of the tractor chassis. Imported components are used to ensure smooth movement and reduce the risk of fluid leakage.

See » Overview of the model range of YuMZ excavators

Cabin

The operator's workplace is located in a closed-type all-metal cab. The seat is equipped with adjustments for the distance to the pedals, for height and for the angle of the backrest. Seat base provides 180° swivel. Seat reversal is used when driving an excavator.

The windshield and rear window of the cab recline, providing ventilation. The standard equipment includes a heater and electric wipers.

Device

The excavator-bulldozer EO-2621 uses wheeled tractors as a base, the design of which is not designed for high loads. To reduce the risk of breakage of the skeleton, additional elements were installed that increased the weight of the machine. A blade with a hydraulic drive is installed on the front of the frame, which allows you to work with soil of I-II categories. The blade and control mechanisms serve as a counterweight, ensuring the balance of the excavator during operation. Additionally, there are 2 hydraulically controlled outriggers.

Attachments are mounted on separate frames, allowing unloading the tractor frame.

At the rear of the tractor, a rotary column is installed along with drive mechanisms. The rotary drive device depends on the modification of the technique. The excavator bucket is mounted on the axle, the assembly is connected to the control hydraulic cylinder with additional rods. To install the equipment on the boom, an additional crane with a lifting capacity of 250 kg is used. It is allowed to change the equipment manually, by the operator and assistant.

Advantages and disadvantages

The advantages of excavators include:

• small dimensions of equipment, allowing to work in cramped conditions;
• maintainability;
• prevalence of spare parts;
• simplicity of the design of the base chassis;
• universal scheme of work, which allows excavation and loading of soil with one bucket;
• the ability to work on soils of I-III categories.

Technological disadvantages:

• lack of comfort in the cabin;
• breakage of the frame of the base chassis;
• risk of damage to cylinder rods by dirt;
• leakage of hydraulic lines due to destruction of connections;
• machines based on YuMZ are equipped with weak clutch discs.