Features and characteristics of the TDT-55 skidder and its modifications

The TDT-55 skidder is a specialized tractor produced at the Onega Tractor Plant (OTZ) in 1966 and designed for moving and stacking fallen trees, logs, logs from the felling site to the loading point, logging road and other temporary storage areas.

The unit was created to eliminate heavy manual labor in logging. Increases productivity and improves working conditions.

Device and technical characteristics

The basis of the TDT-55 caterpillar tractor is a rigid frame of a welded box-shaped structure. To protect the engine compartment and transmission, special folding plates are located in the lower part, attached by fasteners to the side members and cross members.

The operator's cabin is in an asymmetrical position relative to the frame. It is made of moisture-proof and heat-insulating materials. Most of it is glazed, which allows you to increase the viewing angle during operation and control the working area.

Inside the driver's cabin there is a convenient dashboard with measuring instruments, a soft seat, a powerful heater and a ventilation system.

The design provides a minimum amount of electrics: 2 front and 2 rear lights for operation at night.

The TDT-55 tractor was first equipped with 4-cylinder diesel units SMD-14BN and SMD-18N with and without turbocharging. To launch them, a P-10UD starting mechanism with a gearbox was mounted.

Engine power reached 95 hp. With. Difficult to maintain, SMD-18N engines with a short overhaul life were converted into SMD-14, while the cylinder-piston group and high-pressure fuel pump were changed, and the turbine compressor was removed due to low-quality fuels and lubricants. Later, a powerful 4-cylinder diesel engine D-245, designed for 122 hp, was installed on the unit. With. at 1200 rpm. Fuel consumption - 17 liters per 100 km.

The skidder transmission is a dry clutch with 2 discs, including a front brake and hydraulic booster to protect against driver fatigue.

The gearbox is not synchronized, 5 forward speeds and 1 reverse.

The hydraulic system consists of 2 separate circuits and a tank. One circuit is responsible for the movement of the skidder and is controlled by the NSh-10 pump, the second serves the mounted mechanisms through the NSh-50 pump.

The fuel system is a constantly operating main and backup system.

Working bodies:

• bulldozer attachment;
• skidding shield;
• reversible winch.

For the TDT-55 tractor, the technical characteristics are as follows:

• overall dimensions - 5850x2357x2560 mm;
• operating weight - 9.6 tons;
• ground clearance - 555 mm;
• track width - 440 mm;
• ground pressure - up to 0.45 MPa;
• travel speed - 13 km/h;
• traction force - 3000 kgf;
• fuel tank volume - 140 l.

Weight characteristics

Before purchasing a skidder, buyers have a question: how much does the tractor and its individual parts weigh?

Operating weight when fully equipped is 9.6 tons.

The weight of the skidder track (one link) is 9.5 kg. 140 links – full set of tracks – 1526 kg.

Frame weight is about 1.5 tons (depending on modification).

There is also a popular question about the weight of the shield (blade) - it can vary due to the overall dimensions and modification of the tractor. The weight of the TDT 55 knife is 200-300 kg.

Features of using a winch

The winch is a skidding equipment. A reversible winch with one drum is installed on the tractor. The device is suitable for correct control of the tractor.

The winch has a band brake. A lever is provided for control, characterized by reliability and simplicity of design.

Usually a cable with a diameter of 19-21 millimeters is used. The drum holds 40 meters of cable. Be sure to take into account the force of the winch for proper and safe operation of the vehicle.

Advice! The equipment requires regular maintenance to ensure continued use and maintain its original properties. Be sure to use special lubricants for the units and carry out cleaning work for the structure.

For long-term operation of the winch, take into account the main aspects of the operating instructions.

TDT-40

In 1956, TDT-40 skidding tractors were first produced at the Minsk Tractor Plant (MTZ); from 1957 until the end of the 60s, they were produced at OTZ. Then they were replaced by the TDT-55 model.

A distinctive feature of the equipment is the 4-cylinder diesel engine D-40T with a power of 40 hp. With. The working volume is 4.5 liters.

The TDT-40 tractor of traction class 2 is small in size, despite its high performance. It is 4500 mm long, 1830 mm wide and 2430 mm high, making it easy to maintain and store. Total weight - 6.5 tons.

The following additional equipment can be installed on the equipment:

• winch;
• loading shield;
• hydraulic drive

Thanks to proper operation and maintenance, the TDT-40 unit is still found in logging sites in Siberia.

Design of the driver's workplace

When developing the TDT-55, special attention was paid to increasing the comfort of the cabin and the driver’s workplace. Taking into account the shortcomings inherent in its predecessors, first of all, the cabin was separated from the engine. If necessary, access to the engine was provided by an opening partition.

Cabin TDT-55

The height-adjustable chair provided particular convenience. This feature was implemented to facilitate the driver’s work, regardless of his height. The all-round glazing provided an excellent view. In earlier versions of the tractor, visibility was impaired by the towering instrument panel.

Safe operation of the tractor in any weather was ensured by a front windshield wiper equipped with an electric drive. The rear wiper drive remains manual.

To work in hot weather, the tractor is equipped with a ventilation system. During the cold season, a comfortable temperature in the cabin is maintained by a built-in stove. There were also places in the cabin where you could put a thermos, a first aid kit and a box for the operator’s personal belongings.

TDT-55A

The TDT-55A skidder is a modification of the TDT-55 tractor with more advanced functionality.

The TDT-55A vehicle is equipped with a 4-cylinder uncompressor diesel engine SMT-14 with vortex-chamber mixture formation or SMD-18N-01 with a P-10UD launcher and gearbox. Engine power - 75-80 and 95 hp. With. respectively. The crankshaft rotation speed is 1800 rpm. Fuel consumption is 218 g/kW*h.

The late model TDT-55A-05 is equipped with a D-245L engine - a 4-stroke turbocharged diesel engine with a power of 105 hp. With.

The power units and transmission are located so that the frame pan protects the units from stones, stumps and small bushes, and the cab hood protects the fuel tank and hydraulic tank from external mechanical damage.

Overall dimensions of skidder 55A - 5800x2357x2560 mm.

The operating weight of the TDT-55A tractor is 9600 kg, the structural weight is 9200 kg.

Design features of TDT-55

At its core, the TDT-55 skidder contains a strong welded box-shaped frame. In order to preserve the components of the transmission and engine below, specialized hinge sheets are attached to the beams and side members of the frame using bolts. During technological maintenance, it is necessary to periodically clear the frame of debris and wood fragments. The driver's cabin is located asymmetrically on the frame. The driver also plays the role of an attachment operator.

The carefully insulated cabin has a large glass area, which allows you to observe the working area around the skidder. For operator convenience, there is a fan and a strong heater. Management is meaningfully simplified, since the presented equipment is specialized for performing work in hard-to-reach forest areas. For the same reason, the device is designed with as little electrical equipment as possible. The process is controlled using two levers, with the help of which turns are made and the unit is braked. Pedals are used: clutch activation and fuel supply. Right next to the cabin there is a diesel engine, covered with a metal hood.

Diesel engines SMD-14N and SMD-18N-01 are used as the power plant. For starting there is a P-10UD unit with a personal gearbox.

TDT-60

The TDT-60 machines were developed by MTZ together with NATI and were produced by the Altai Tractor Plant from 1957 to 1962. They had high traction characteristics and good maneuverability.

In one trip the unit can transport the following amount of wood:

• sticks loaded with their tops forward - 12-15 m³;
• trees located with their butts forward - 8-9 m³.

The vehicle is equipped with a D-54 diesel engine with a capacity of 60 hp. With. with increased rotation speed - 1500 rpm.

Transmission - manual step.

The hydraulic drive contains a pump NSh 60/75 with a high productivity of 70 l/min, a 4-position spool valve and double-acting hydraulic cylinders.

To expand functionality, the following mechanisms are mounted on the tractor:

• bulldozer blades;
• uprooter-gatherers;
• snow blowers;
• winch.

The TDT-60 skidder has the following parameters:

• weight - 11 t;
• travel speed - 2.1-7.6 km/h;
• overall dimensions - 5500x2400x2700 mm.

Hydraulic system TDT 55

The hydraulic system began to operate on the basis of a dual-circuit device with a tank. The system includes: a motion control system, which operates using an NSh-10 pump (with 3-section amplifiers), as well as pipelines. With the help of the first section, the effort when engaging the clutch is reduced, and with the help of the second and third, turns are made easier. Due to the high efficiency of this system, all of the above actions can be performed with the fingers of one hand. Using the NSh-50 pump, pipelines, hydraulic distributor and hydraulic cylinders, the working parts of the system are controlled. The first section is responsible for controlling the bulldozer, and the second for the skidding shield.

Advantages and disadvantages

Skidders TDT-55 have a number of advantages, including:

• high maneuverability and maneuverability in difficult forest conditions;
• low fuel consumption;
• increased ground clearance;
• softness and smoothness;
• stability on steep slopes.

The disadvantages include the following factors:

• complexity of repair and maintenance;
• high cost of the chassis during repairs;
• frequent clutch failure;
• low engine overhaul time.

Basic faults and repairs

Many owners note the maintainability of these machines and the interchangeability of parts. There are a large number of photos on the forums about their conversion.

The sequence of basic repair work is given in the operating instructions.

If the engine does not start, here is what could cause this:
• Lack of diesel or motor oil;
• There is dirt in the fuel or air filter;
• The ignition system has failed;
• The carburetor is not mixing fuel and air correctly.

If there is excessive vibration coming from your crawler tractor, check the following:

• Is there fuel and oil?
• Are all bolted connections tight?
• Is the attachment mounted correctly?

Particular attention must be paid to the caterpillars. They are responsible for the movement of the TDT 74 tractor and are subject to heavy loads./p>

Therefore, they should be serviced once every 3 months.

Analogs

"Onezhsky Tractor" produces many popular and reliable models of forestry tracked tractors, including TDT-40, TDT-55, TLT-100 and machines called "Onezhets" (300, 310, 320 and others).

The Onezhets series machines differ from TDT and TLT in that they are used to extinguish forest fires, as well as to lay firebreaks.

Onezhets-310 is equipped with a plow, winch, tank and pump. Onezhets-320 is used for logging work; its advantage lies in the increased width of the tracks, which causes minimal damage to the soil. Has high cross-country ability.

The universal models of Onezhets are 310 and 380, because they are used for firefighting and most logging operations. Onezhets-392 has a dump body, which allows it to transport bulk cargo (crushed stone, sand).

Forestry equipment from is also of high quality. The MSN-10 skidder allows you to pick up and transport bundles of trees with a volume of up to 10 cubic meters.

The K-703MA skidder produced by the Kirov plant is capable of transporting bundles of trees with a volume of 7 m³, the productivity of such a machine is 45 m³ per hour.

The difference between the models lies in performance and load capacity, as well as the presence of additional functions. It is impossible to say which skidder is better, because they are created for different operating conditions.

Operator's cabin TDT 55

Taking into account the problems that were present in previous models, the manufacturer has simplified the design of the operator's cabin to the maximum and implemented some additional functions:

• the ventilation system was updated for use in the summer;

• it became possible to adjust the operator’s workplace by height and weight, which makes the work process more convenient;

• they began to install a special stove in the cabin, which provides heating in winter;

• allocated space for a first aid kit, thermos and coat hooks.

Gearbox TDT 55

The gearbox is located on the engine flywheel and has the following gears:

• 5 steps: to move forward;
• 1st degree – for moving backwards.

For this unit to function, it must have a sufficient amount of lubricant. The filling volume in this case is 3.5 liters. A distinctive feature of the tractor gearbox is the special mechanism in its design that prevents gear shifting when the clutch is engaged or not fully engaged.

Tractor purpose

The TDT 55 forest skidder is designed for the removal and collection of cut trees at logging sites; it can also cut branches and drag (skid) processed tree trunks over long distances off-road. Stack logs. It can clear forest areas of cut down stumps with roots and uproot them. With its help you can load logs into wagons. He doesn’t care about taiga wilds, steep slopes, or swampy terrain. It doesn’t get stuck almost anywhere, since the gap between the bottom and the soil is quite large. Performs the most difficult work in logging. Works reliably in 40 degrees of frost and 40 degrees of heat. An unpretentious, reliable, powerful machine.

The tractor has found application in geology. Oil workers and gas industry workers use its power for their needs. In demand in road construction.

Characteristics of skidding tractor Onezhets TDT-55

Maintenance

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The TDT 55 tractor belongs to heavy professional skidding equipment. To operate it correctly, you should read the user manual.

It, in the form of a photo, illustrates the purpose of all the levers, the rules for setting up the machine, and the features of its maintenance and use.

The TDT 55a tractor has gained great popularity due to the fact that it combines high technical characteristics and ease of maintenance.

In order for all tractor parts to get used to, it is necessary to run in at partial speeds. During this period, it is recommended to carry out all work, avoiding increased loads. Upon completion of the break-in, you need to change the engine and transmission oil. You should regularly clean the body of the TDT 55 tractor from dust and oil stains, and also adjust the clutch and brake pedals every 50-100 hours of operation;

If you do not plan to use the tractor for a long time, it is necessary to preserve it, namely: clean it from dirt, dry it, drain the oil and fuel, lubricate the parts to prevent corrosion from forming, cover it and put it in a dry place. The oil in the engine crankcase must be changed after 100 operating hours. GOST M-10G2k should be poured. TAP-15v is best suited for transmission. The transmission oil should be changed after 1000 hours of operation. To refuel TDT 55 tractors, you must use clean and fresh diesel. The presence of sediment or foreign impurities in it is not allowed.

Scope of application of TDT-55

The basic machine TDT-55 and its 2 modifications are used as working machines for a wide range of applications in various fields:

• skidding operations when felling timber;
• packaging during logging operations;
• delimbing work;
• excavation, loading or road construction work associated with difficult soil or terrain overgrown with vegetation.

Due to its unique properties, this tractor is very often used in geological exploration work. The great popularity of the TDT-55 is due to its ease of use, the ability to perform repairs in difficult conditions, and most importantly, the high performance of units and components. Spare parts for the tractor are available and relatively inexpensive. Manufacturers managed to achieve such durability of the structure through the use of the most reliable and high-strength materials and constant work to simplify the mechanisms.