Excavator EO 2621: technical characteristics, device features, analogues

The Chelyabinsk Tractor Plant, which produces a wide range of specialized equipment, as well as units for their assembly, offers for sale a line of excavators, modified and improved according to international standards. This category includes the compact mini excavator EO 2621 in the basic configuration, the main task of which is to mechanize excavation work.

The advantage of the equipment is the optimal balance between cost, power, fuel and fuel consumption and maneuverability, which has a positive effect on the cost of the work performed.

Purpose

The technical characteristics of the EO 2621 allow the tractor to be used by municipal and agricultural farms, as well as industrial and construction enterprises:

for earthworks - digging pits, trenches;
as a front loader – loading bulk materials into trucks;
for leveling surfaces - backfilling trenches and holes;
construction of embankments - raking of loose or viscous material, garbage, development of faces.

Work is carried out on grade 1-4 soils.

EO 2621

Engine, gearbox, control systems

The advanced sectional hydraulic distributor of the latest model EO-2621V-3 has anti-cavitation valves Hydrocontrol and built-in fuses, which allows for smooth combination of operations and increases the accuracy of operation. Delivery of the EO-2621-B3 excavator-bulldozer ZLATEKS based on the MTZ 82 tractor can be carried out either directly from the manufacturer or from sites in Moscow and other regions of the Russian Federation.

Specifications

The description of the EO 26 21 tractor can be divided into 3 components:

technical – design, dimensions, engine, transmission, chassis;
working conditions and, as a consequence, productivity and elimination of the human factor during work - organization of the workspace, ergonomics of the cabin and control panel;
economic component - performance and payback, mobility, ratio of work performed to cost.

In general, the EO 2621 in 2 trim levels is a medium-power, compact tractor with dimensions of 2200x3800x6480 mm, weighing 6100 kg and developing a speed of 2.1-19 km/h. For high maneuverability, it is mounted on a wheelbase with a width of 2450 mm, ground clearance of 400 mm and wheel tracks:

front drives and guides – 1460 mm;
rear drive – 1550 mm.

Depending on the modification, a motor is installed on the equipment:

D-65N 40 hp (option A);
D-245 65 hp (option B).

Be sure to read: Excavator EK 14

Parameters of attachments. The working units consist of:

of two buckets (replaceable as needed) with a volume of 0.15 and 0.5 m³;
backhoe with a volume of 0.25 m³.

Maximum productivity for bucket operation is 40 m³/hour, with the ability to:

the lowest digging point is 3000 (in the later version 3500 mm);
loading height with a loader in the range of 2200-3300 mm;
with a cutting force of 25-26 Kn.

Engine characteristics

The initial modification was equipped with a less powerful D-65 engine (41 hp), so the technical characteristics of the EO 2621A differed from the later one - EO 2621B 2 in which the power of the D-243 engine was 65 hp. This made it possible to increase the digging depth to 3500 mm and the soil cutting force.

Engine D-245 is a 4-stroke engine with water cooling (forced circulation of liquid), cranks. shaft 2200 rpm and V engine 4.75 l.

Cabin

The cabin of a modern excavator is maximally glazed, meets domestic standards, and reduces the influence of negative factors: noise and vibration. A heater is installed, and the exterior is equipped with a washer and electric wipers. An ergonomic panel with access to the sensors is located at a distance of 50 cm without creating inconvenience.

Excavator EO 2621

Fuel consumption

Diesel fuel consumption increases depending on the effort applied to the engine. Approximate flow range:

minimum consumption 5.5 l/h, consumed when transporting cargo up to 300 kg at an average speed of 10 km/h;
maximum 12 l/hour at low speeds and working with a full load, i.e. cutting soil and building embankments, shoveling viscous soil, etc.

In any case, the tank volume of 100 liters allows you to operate the EO 2621 tractor full time without refueling.

Fuel consumption

Technical productivity, m3 h 60 80 Base chassis pneumatic Excavator working equipment with a bucket capacity of 0.32 m3 Maximum digging depth, m 4.0 Maximum unloading height, m 5.9 Overall dimensions in transport position, mm length width height Maximum travel speed , km h Weight, t 8.0 Calculation, people Manufacturer OJSC Tver Excavator Plant, An indicator of the high need of the Soviet Union for this equipment at that time is that entire enterprises were converted into excavator factories to produce exclusively the above-mentioned models.

Device

The tractor acquired the second name “YUMZ EO 2621” due to the fact that it was made on the basis of the YUMZ-6AL (6AM), a light and mobile model with an economical engine and good grip weight. The original model was not intended for such work, but thanks to the design solution - strapping with an additional frame, which increased the weight of the excavator to 6.1 tons, it made it possible to create a very ergonomic and inexpensive machine.

Be sure to read: Volvo BL71b excavator

What innovations did the EO 2621 excavator receive on the YuMZ basis and what are its significant parameters?

Hydraulics. Double-circuit separate hydraulics: 7.5 MPa for the bucket and 10 MPa for the bulldozer blade, provided by 6 NSh32-3 gear pumps. Oil is drawn from one tank. A modern system of anti-cavitation control valves and fuses has been installed for ergonomic use of the small and smooth movements of the bucket (and other devices) with a load.

Chassis. Worm steering is complemented by a hydraulic booster. 9-speed manual synchronized gearbox with reduction gearbox, operating in 3 ranges (4 rear speeds). The running gear of the EO 2621 excavator is designed on a beam-type bridge with a built-in hydraulic travel reducer.

Cabin equipment

The EO-2621 cabin is equipped with efficient ventilation and heating systems. The seat rotation angle is 1800. The working space provides convenient placement of control handles and panels in the front and rear of the cab. They are divided into groups for managing excavator and bulldozer equipment. The panoramic window of the EO-2621 cabin allows you to control the progress of work.

Advantages and disadvantages

In the photo, the EO 2621 looks like a typical Soviet tractor, but unlike many models of this class, the EO 2621 single-bucket excavator has advantages that are effectively used by small and large farms and enterprises.

First of all, this is a combination of capabilities and price that pays off in a maximum of 2 years, to this you can add a service life that rises above that specified in the regulatory and technical documentation;
High maintainability and availability of spare parts;
Prompt change of working parts on site using duty tools (without the need to drive to the garage);
Economical engine and high grip weight;
Starts well at sub-zero temperatures.

The disadvantages include:

Unsightly appearance in comparison with modern special equipment;
The workplace is not equipped with a hydraulic lifting device and shock absorption.

Reviews

Feedback from one of the metallurgical enterprises: We have an impressive fleet of special equipment, including EO2621A. For 10 years it has been operated by a management site and a construction team. In addition to working with the main units, the tractor (depending on the season) works with a trailer, a brush, a hydraulic hammer, and also includes a backhoe. The work he does is extensive; if you compare it with equipment maintenance and cost, then this is perhaps one of the most optimal options. When purchasing equipment, this is what was calculated: minimum costs, high payback and duration of work.

Be sure to read: Excavator EO 4121: technical specifications

Price

This machine is a completely affordable version of multifunctional special equipment for everyone. The cost of a new bulldozer excavator EO-2621 varies from 150 thousand rubles to 450 thousand Russian rubles. Newer modified versions have a much higher cost - from 900 thousand rubles to one million Russian rubles. To a large extent, the final cost of the machine is influenced by the year of production, equipment and installed attachments.

Used equipment currently costs from 90 thousand rubles to 400 thousand Russian rubles. Here the price depends on the year of production, installed attachments, general technical condition and the number of engine hours worked.

What can be included with

The basic equipment installed on all modifications consists of 2 dumps for various purposes:

excavator bucket 0.5 m³ installed on a turntable;
bulldozer blade.

If necessary, the following are installed on hydraulic equipment:

grabs of various modifications and permissible load capacity;
profile (narrow or wide) buckets 0.15 and 0.25 m³;
hammers;
lifts;
ripper teeth;
backhoe;
crane hooks. — A total of 22 types of attachments.

The semi-rotary excavator EO-2621V-3, belonging to the 2nd size group, is designed for mechanization of small-volume excavation and loading work. It is mounted on a pneumatic wheeled tractor YuMZ-6KL. This machine is designed for developing soils of groups I...IV and loading bulk and finely crushed materials. The machine is equipped with two types of working equipment: excavator and bulldozer. In total, the machine can be equipped with 22 types of replaceable working equipment and working parts. The main working part of excavator equipment is a 0.25 m3 bucket of a forward and backhoe. In addition, the excavator can be equipped with a 0.5 m3 loading bucket, a crane suspension, forks, a telescopic handle, a grab, a backhoe with a mixed digging axis, a hydraulic hammer, a ripper tooth, a gripper, drilling equipment, profile and special buckets.
Excavator EO-2621V-3: 1 - fuel tank; 2 — working fluid tank; 3 — driver’s cabin; 4 — control lever; 5 - hydraulic distributor; 6 — boom hydraulic cylinder; 7 — hydraulic cylinder of the handle; 8 - boom; 9 — handle; 10 — bucket hydraulic cylinder; 11 - ladle; 12 — lever; 13 — outrigger; 14 — support hydraulic cylinder; 15 — rotary column; 16 - pumping unit; 17, 18 — frames; 19 — hydraulic cylinder of the bulldozer blade; 20 — blade frame; 21 — bulldozer blade

Using a backhoe, small pits, holes with steep walls, trenches for underground utilities, and shallow channels are removed. Reclamation canals are cleaned with a profile bucket. Using a straight shovel, they excavate shallow faces located above the machine parking level, carry out cleaning work in pits, and load bulk and small-sized materials. Large lump materials are loaded with a lattice bucket. Using a grab bucket, wells are dug out, trenches and channels are cleaned, and various materials and rocks are loaded. The loading bucket is used for light clearing work and loading of debris, snow and other materials. The crane suspension is used for loading and unloading piece goods, laying pipelines and installing poles. Forks are used when loading. Bulldozer equipment is installed in the front of the tractor, which is used for filling trenches, clearing roads, and raking construction waste. It can be used to work with soils up to group II inclusive. A hydraulic hammer and ripper tooth are used to open up the asphalt surface. In addition, the ripper tooth can be used to break up a crust of frozen soil up to 300 mm thick. A hydraulic hammer is also used to open concrete coatings and crush rubble stones and frozen soil. A hydraulic hammer equipped with a tamping plate is used to compact bulk soils. A backhoe with an offset digging axis is used to dig trenches near buildings and structures. Narrow trenches for laying cables are torn off with a special bucket. Using a grabber, logs and other piece materials are loaded. Drilling equipment is used to dig holes of various diameters to a depth of up to 2 m. Unlike previous models, the EO-2621V-3 excavator is equipped with a new unified bucket of 0.25 m3 of forward and reverse shovels, which has a more rational design. This bucket is of a more rigid design; its bottom does not open; durability is significantly increased. The rotation angle of the bucket is increased due to the use of a six-link mechanism. To improve the operating parameters of the machine, especially with the main equipment “backhoe”, an elongated handle was used, which made it possible to increase such an important indicator as the digging depth from 3.5 to 4.15 m. In order to increase the service life of the working equipment on the bucket hydraulic cylinder unloading valve installed. The stability of the excavator during operation has increased due to the introduction of hydraulic locks into the design of the hydraulic cylinders of the outriggers and the bulldozer blade. To ensure reliable operation, the metal structure of the bulldozer equipment has been strengthened.

Technical characteristics of the EO-2621V-3 excavator

Basic car	Tractor YuMZ-6KL
Capacity, m3:
..main backhoe bucket	0,25
..changeable buckets	0,15 — 0,5
Engine	D-65
Engine power, kW	44
Travel speed, km/h	until 19
Maximum angle of elevation, degrees	13
Control of main mechanisms	1.7 and 2.4
Conveyor:	hydraulic
Operating weight with working equipment “backhoe”, t	6,1

The working equipment is mounted on frames, the fastening of which is made in such a way as to relieve the load on the tractor frame. The bulldozer blade can be installed at different heights using a hydraulic cylinder. In addition to its main purpose, the blade also serves as a counterweight. To increase the stability of the excavator during operation, outriggers are attached to the frame. With the help of two hydraulic cylinders, the supports are lowered to the ground or raised up while the machine is moving. A rotating column and a rotating mechanism for excavation working equipment, consisting of a boom, a handle and a bucket, are also mounted on the frame. Each of these assembly units is controlled by one (boom and bucket) or two hydraulic cylinders (arm). Liquid is supplied to these hydraulic cylinders under pressure from a pumping unit. The supply of working fluid for the hydraulic system is in the tank. The machine is controlled by moving the hydraulic valve spools. The driver's seat can be rotated 180°. In one position, the driver controls the tractor while moving, and in the other, the operation of the excavator. For ease of maintenance, the fuel tank is located in the front part of the tractor. The operator replaces the working equipment within an hour using a crane with a lifting capacity of up to 0.25 tons. In the absence of lifting equipment, the participation of a second worker is necessary for reinstallation. The drive system completely determines the performance of the machine, the quality of excavation work, the rational combination of work operations, and the maximum use of the power of the power plant.

Backhoe: 1 — bucket hydraulic cylinder; 2 - thrust; 3 - axis; 4 - unified backhoe and forward shovel bucket; 5 - narrow bucket; 6 - profile bucket; 7 - special bucket; 8 — ripper tooth; 9, 10 — bolts; 11 - fork

The working equipment is installed on the rotating column body. Bucket 4 is mounted on axis 3 and connected to hydraulic cylinder 7 through rods 2. Buckets 5, b and 7 and ripper tooth 8 are also mounted on the handle. When installing the fork, the forks are fixedly mounted on the handle with bolts, and the grab is pivotally mounted on axis 3 handles

Forward shovel: 4 - unified bucket of reverse and forward shovels; 12 — hydraulic cylinder of the handle; 13 — loading bucket; 14 — lattice ladle; 15 - grain bucket

When converting to a straight shovel, bucket 4 is positioned with its teeth outward and secured to the lower fork of the handle with rods. The hydraulic cylinder rods 12 are fixed in the lower hole of the handle. Buckets 13, 14 and 15 are mounted in the same way.

Grab 16, 21 - fingers; 17- handle; 18 - pipeline; 19, 20 — sleeves; 22 — grab head; 23 — hydraulic cylinder of the grab bucket; 24 — grab bucket jaw; 25 — grab forks; 26 - bucket without teeth

Before installing the grab, disconnect the sleeves of the hydraulic cylinder 7 of the bucket, the rods of the hydraulic cylinders 12 and the handle itself. Remove the handle along with the bucket and hydraulic cylinder of the bucket. The grab handle 17 is connected to the boom with a finger 16. The handle cylinder rods are secured to the handle eye. The head 22 is attached to the handle with a finger 21. Two jaws 24 are installed on the head, moved by two hydraulic cylinders 23. The working fluid is supplied through pipelines 18 and hoses 19 and 20. Instead of a grab bucket with teeth, you can mount grab forks 25 or a bucket 26 without teeth on the handle.