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Belarus-921
is a gardening wheeled tractor, traction class 1.4 with a 4x4 wheel arrangement, designed to perform a range of work on cultivating gardens and vineyards: working with a cutter and sprayers. It can be used in agricultural production to perform a number of mechanized work in livestock farming, for example, for distributing and storing feed, as well as in industry, construction, utilities and transport.

Design

Engine

The MTZ-921 tractors are equipped with four-cylinder, four-stroke diesel engines of the D-245.5 family produced by the Minsk Motor Plant with a semi-separated combustion chamber made in the piston. Engine displacement is 4750 cm3. Rated power 70 kW (95 hp).[1]

Transmission

• Clutch - dry, single disc
• Clutch control - hydrostatic
• Gearbox - mechanical, step-by-step
• Number of gears: forward/backward - 18/4
• Travel speed, km/h:

1. forward - 1.8-35
2. back - 4.1-11.5

• Rear PTO:

1. independent I, rpm - 540
2. independent II, rpm - 1000
3. synchronous, travel rpm - 3.4

Changing the speed from slow (1.8 km/h) to maximum transport (35 km/h) forward is provided by 16 steps in the gearbox. Accordingly - reverse gear from 4.5 to 7 km/h - in 4 steps. This allows you to select any agrotechnical speed of movement of the units depending on the type of work performed. Speeds are switched easily using synchronizers. Control is carried out by one gear lever.

When the traction of the rear wheels with the soil decreases or the traction force increases, the front drive axle is automatically connected, which allows the full weight of the tractor to be used as a coupling axle, and, therefore, ensures high traction power. Hydrostatic steering ensures ease and simplicity of tractor control when performing any work. The hydraulic lift provides power, positional and mixed methods of automatic adjustment of the rear linkage.

To improve traction and grip qualities, a mechanical differential lock is provided. Rear axle differential lock: with electro-hydraulic control, has three operating modes: lock off; the locking is turned on with automatic shutdown when the front wheels are turned at an angle of more than 13º; blocking is forced. The locking clutch is a dry multi-disc clutch. On request - multi-disc, operating in an oil bath.

For agricultural machines with active drive, a rear power take-off shaft is installed. It has two independent rotation speeds of 540 and 1000 rpm and two synchronous rotation speeds of 2.3 and 4.2 rpm.

Hydraulic suspension system

• Universal, separate-modular, with a hydraulic lift, providing power, combined and height adjustment of the position of the implement.
• Load capacity on the axis of the lower link hinges, kN (kgf) - 40 (4000)
• Maximum pressure, kgf/cm2 — 200
• Pump capacity, l/min — 45
• Oil tank capacity, l - 30

The tractor is equipped with the necessary towing devices designed for aggregation with the entire complex of agricultural machines and implements.

For mounted and semi-mounted machines:

1. rear linkage (NU-2) with quick-connect devices with a lifting capacity of 4000 kgf on the suspension axis, which is provided by two power hydraulic cylinders.
2. front linkage (NU-2), with a lifting capacity of 1500 kgf on the suspension axis of the second category.

For trailed vehicles - towing device (TSU-1) - double crossbar - with permissible vertical load up to 400 kgf. Semi-trailer and trailed vehicles are aggregated through a towing device (TSU-1V) - a traction fork (vertical load - 1200 kgf).

Brakes

The main ones are mechanical disc brakes, the brake drive is hydrostatic separate. The parking brake is combined with the main brakes with an autonomous mechanical drive. The trailer brake drive is pneumatic, two-wire, interlocked with the tractor brake control.

Cabin

Single-seat, low-profile, comfortable, safe (ROPS), with bent frame profiles, meets OECD requirements, with filtration and heating of the air supplied to the cabin, with opening side windows, rear glass and sunroof, with sun visor, with electric windshield wipers and washers front and rear windows.

Equipment

Single-line pneumatic system in accordance with ISO and CEE/EEC standards, three pairs of hydraulic system outputs for additional hydraulic mechanisms, height-adjustable towing device, rear towing fork (TSU-3B).[2]

Tractor Belarus-921.3

Tractor BELARUS 921.3 of traction class 1.4 with a 95 hp engine. made according to the wheel formula (4x4). It is characterized by reduced overall dimensions and ground clearance and is designed to perform various work on fruit plantations, orchards, vineyards, vegetable gardens, as well as in industry, construction, public utilities and transport in combination with mounted, semi-mounted and trailed machines and implements.

Specifications:

Engine:

Diesel with turbocharging and intercooling

Transmission:

Rear axle differential lock: electrohydraulic controlled, has three operating modes:

• blocking is disabled;
• the locking is turned on with automatic shutdown when the front wheels are turned at an angle of more than 13 degrees;
• blocking is forced;

The locking clutch is a dry multi-disc clutch. On request - multi-disc, operating in an oil bath.

Hydraulic suspension system:

Universal, separate-modular, with a hydraulic lift, providing power, combined and height adjustment of the position of the implement.

Dimensions and weight:

Steering:

Hydrostatic, with a metering pump and a cylinder in the steering linkage

Front drive axle:

Portal type, conical, with five studs. Three operating modes: off, always on, turns on automatically when the rear wheels slip

Brakes:

The main ones are mechanical disc brakes, the brake drive is hydrostatic separate. The parking brake is combined with the main brakes with an autonomous mechanical drive. The trailer brake drive is pneumatic, two-wire, interlocked with the tractor brake control.

Electrical equipment:

1150 Watt generator set, starting system with 12 V starter.

Cabin:

Single, low-profile, comfortable, safe (ROPS), with bent frame profiles, meets OECD requirements, with filtration and heating of the air supplied to the cabin, with opening side windows, rear window and sunroof, with sun visor, with electric windshield wipers and washers front and rear windows.

Equipment:

Single-line pneumatic system in accordance with ISO and CEE/EEC standards, three pairs of hydraulic system outputs for additional hydraulic mechanisms, height-adjustable towing device, rear towing fork (TSU-3B)

The lineup

Design Features

The basis of the Belarus MT3-921 tractor is a semi-frame with a diesel engine, a gearbox, a clutch housing, a rear axle, a mechanical multiplier, a rear PTO, a front axle, a hydraulic lifting system, a towing mechanism, and a cabin with controls placed on it.

If the level of adhesion of the rear wheels to the soil decreases, or the traction force increases, then the front drive axle is automatically connected. This allows the full weight of the tractor to be used as a coupling, guaranteeing its high traction power. Hydraulic volume steering ensures ease and simplicity of tractor control while performing any type of work. The hydraulic lift produces power, positional and mixed methods of automatic adjustment of the rear linkage.

The hydraulic attachment system is designed for raising/lowering the hitch under its own weight or automated positioning, forced and combined adjustment of plowing depth, and automatic pump unloading in transport mode. The towing mechanism consists of a single or double cross member, which is combined into one device with the rear linkage.

This tractor is equipped with a single-line pneumatic system, made in full compliance with ISO and CEE/EEC standards; 3 pairs of hydraulic system leads for connecting additional hydraulic mechanisms; height-adjustable towing device; rear towing fork (TSU-ZV).

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Transmission Belarus-921

This model uses a dry, permanently closed, single-disk friction clutch. Clutch control is hydrostatic. The synchronized dual-range gearbox with multiplier has 18 forward speeds and 4 reverse.

Forward speed ranges from 1.8 to 35 km/h; when moving backwards - from 4.1 to 11.5 km/h. A large set of gears helps to optimally select any agrotechnical speed of movement of the tractor with units and additional equipment, depending on the type of work performed. The gears are characterized by easy shifting, which is facilitated by the presence of synchronizers.

The rear power take-off shaft is independent, it has two speeds - 540 rpm and 1000 rpm. Synchronous rotation speeds of the rear PTO are 2.3 and 4.2 rpm.

The mechanical differential lock of the rear axle is designed to improve the traction and traction qualities of the tractor. It has electro-hydraulic control and three main operating modes: locking off; the locking is turned on with automatic shutdown when the front wheels are turned at an angle of more than 13 degrees; or the blocking is enabled in forced mode. The locking clutch is dry, multi-disc. On request, a multi-disc one operating in an oil bath can also be installed.

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Technical specifications in numbers

• Overall dimensions: length 4.5 m, width 1.55 m, height 2.35 m.
• Wheelbase – 2.37 m.
• Total weight – 3.8 tons.
• The maximum permissible weight is 7 tons.
• Tire size: front – 12.4L-16; 265/70R16; rear – 420/70R24; 14.9R30.
• Specific ground pressure – 14О kPa.
• The steering angle of the front wheels is 55 degrees.
• Specific fuel consumption at diesel operating power is 226 g / kW*h.
• Front wheel track width – 1.16÷1.6 m; rear wheels – 1.25÷1.45 m.
• The smallest turning radius is 4 meters.
• Ground clearance – 310 mm.
• Fuel tank capacity – 95 liters of diesel fuel.

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