Description
The TDT-55 tractor, on caterpillar tracks, is used for transporting and stacking medium and large trees after they have been felled.
The TDT 55 tractor was developed specifically to perform work in highly complex conditions due to its heavy weight and engine power.
The first skidding tractor TDT 55 was produced in 1966 at the Onezhinsky Tractor Plant. And the last representative of this machine was designed in 2003.
Then it was replaced by Onezhenets-300.
Most owners agree on positive reviews of this car. It is easy to operate and has excellent performance properties.
Over the long period of production, the TDT-55 has been improved several times.
Skidding tractor TDT-55. History of creation
For a long time, tractors of earlier versions produced by the Onega Tractor Plant were used to implement a variety of tasks. But at the same time, the TDT-40 and its modifications ceased to meet most of the requirements already in the early 60s of the last century. This was the main impetus for the creation of the TDT-55.
The lead design organization OTZ designed a conceptually new model of this type of equipment - TDT-55. In 1962, the model passed all state tests completely successfully. By 1964, production of the TDT-55 was put on the assembly line. The main task of the tractor was to clear the forest. The volume of the whip for normal transportation should be 0.6 m2.
Basic model of tractor TDT-55
Development of this tractor model began back in 1950. The T-49 machine served as the basis for the development of a new tractor. The main task set for the designer was to maximize the functionality of the new machine. The main distinguishing feature of the TDT-55 from its predecessor, the TDT-40, was its greater performance and reliability. In general, the designers achieved the implementation of the task assigned to them.
Specifications
- Weight and dimensions
- Engine
- Transmission
- Chassis and transmission
- Cabin and controls
The weight of the TDT-55a tractor is 9600 kg. Overall dimensions of the model – 580×235×2560.
This machine belongs to the third traction class.
The technical characteristics of the TDT 55 tractor allow it to be used in dense forest conditions.
The TDT 55 caterpillar tractor is equipped with a four-stroke diesel engine SMB-14B.
Initially it was produced with a power of 100 horsepower, later this figure was increased to 130 hp.
The average diesel consumption on the first SMB-14 was 160 g/hp. h, and in later models - 200 g/hp. h.
The gearbox is connected directly to the engine flywheel. It has 5 steps for moving forward and one backward.
For normal operation of the gearbox, it is necessary to fill in a special oil (ATP). The tank volume is 3.5 liters.
The gearbox locking mechanism will not allow you to change the gear of the TDT 55 tractor when the clutch is engaged or not fully released.
These parts emphasized simplicity and reliability. The TDT 55 tractor is equipped with a dry-type double-disc clutch.
It consists of pins, a spring, a heat-resistant gasket and a casing.
The transmission has a front brake.
The standard equipment includes a hydraulic booster. It significantly reduces the burden on the owner.
During the design of the TDT 55 tracked tractor, special attention was paid to the cabin.
A comfortable seat for the owner was installed, which is height adjustable. The TDT 55 tractor cabin is separated from the engine by a partition, which can be removed if necessary.
To ensure visibility in front and behind, windshield wipers are installed.
To maintain a comfortable temperature inside the cabin throughout the year, a stove and fan were installed.
A winch is installed at the back of the TDT 55 skidder, which pulls downed trees.
Design Features
The basis of the TDT-55 skidder is a welded rigid box-type frame.
To protect engine and transmission elements, special sheets are attached to the bottom of the frame . They are made folding and are bolted to the side members and cross members. For maintenance purposes, it is necessary to periodically clean the frame from dirt and wood residues.
The driver’s cabin is located asymmetrically on the frame, which is also the operator of the attached equipment.
The cabin is well insulated and has a large glass area, allowing you to control the working area around the machine. There is a powerful heater and fan.
Management is deliberately simplified because this special equipment operates in remote wooded areas. Therefore, the design provides a minimum of electrical equipment and control systems.
The movement process is regulated by two levers, with the help of which the machine turns and brakes. There are pedals: clutch and fuel pedal. There are winch control levers.
Next to the cabin is a diesel engine covered with a metal hood. Diesels SMD-18N-01 and SMD-14N are used as the power plant. For starting, a P-10UD starting engine with its own gearbox is mounted.
Transmission; checkpoint; hydraulic, chassis and fuel systems
The transmission includes a dry clutch with two discs, which has a front brake and hydraulic booster.
In addition, there is a five-speed non-synchronized gearbox, equipped with a gear shift lock when the clutch pedal is not pressed.
The transmission for driving the winch has a power take-off shaft. There are also cardan drives and a rear axle with band brakes.
The hydraulic system has one tank and two separate circuits, in which special pumps create pressure.
One GS circuit ensures the movement of the tractor and is served by an NSh-10 pump. The second controls additional equipment and working parts using the NSh-50 pump.
The suspension system consists of: a lever-balance suspension with spring suspension; guide wheels, which have tensioning and shock-absorbing devices; driving wheels and tracks.
The TDT-55 fuel system has its own peculiarities. It consists of a primary and backup system.
The main vehicle is constantly running. The backup system is turned on if it is necessary to add power to the engine or the main system fails.
However, the power of one backup vehicle is only enough to return to base for repairs at the lowest speed.
The working parts of the TDT-55 are a skidding shield, a winch, and a bulldozer pusher.
Maintenance
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.
Engine parameters
When selecting engines for installation on this unpretentious special equipment, manufacturers proceeded from the point of not complicating the overall design and at the same time obtaining the maximum possible effect from the propulsion system.
Initially, the choice was made in favor of the SMD-18N.01 diesel engine:
- four-stroke diesel internal combustion engine with direct injection and turbocharging, water cooling;
- cylinder diameter – 120 mm;
- engine capacity – 6.3 liters;
- Czech-made injection pump;
- power in l. With. - 100;
- nominal speed – 1,800;
- specific diesel fuel consumption – 224 g/kWh;
- The average weight of a diesel engine is 800 kg.
The TDT-55A and LHT-55 configurations included the SMT-14 diesel engine with the following technical characteristics:
- a four-cylinder compressorless internal combustion engine with a vortex chamber formation of the mixture;
- power in l. With. – 75-80;
- nominal speed – 1,800;
- Specific diesel fuel consumption – 218 g/kWh.
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Later versions of the TDT-55A-05 began to be equipped with D-245L engines:
- in-line four-stroke diesel engine with gas turbocharging;
- engine weight – 490 kg;
- power in l. With. – 105;
- maximum torque – 384 Nm;
- nominal speed – 1,400;
- cylinder diameter – 110 mm;
- working volume – 4.5 l;
- Specific diesel fuel consumption – 220 g/kWh.
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.
- Is there fuel and oil?
- Are all bolted connections tight?
- Is the attachment mounted correctly?
If there is excessive vibration coming from your crawler tractor, check the following:
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.
Modifications of the TDT-55 tractor
Over the course of decades of operation, modifications of the equipment of the type in question were produced. Most often today on the secondary market you can find:
- TDT-55-05;
- LHT – 55.
The TDT-55-05 modification is earlier; in fact, it differs little in appearance from the basic version of the tractor in question. But at the same time, the D-245L engine is installed in this modification. Its power is 100 hp. and at the same time it can reach speeds of up to 15 km/h.
The main purpose of this model remains the same – to work directly with loading and skidding of timber. An important feature of the modification is the reduced pressure of the tracks on the ground. On each side it is only 0.4 MPa.
All this together made it easier to operate the tractor on sandy, sticky soils, as well as in winter. Cross-country ability has increased significantly. An electric rear window wiper has also been added.
LHT-55 is much more significantly different from its prototype. And first of all – precisely by its appearance, overall dimensions:
- length, mm – 6,450 mm;
- width, mm – 2,360 mm;
- height, mm – 2,450 mm.
At the same time, the weight remained the same - 9.6 tons.
The main objectives of this modification are as follows:
- clearing of logging areas;
- reforestation work;
- cutting down new sites.
It is for this reason that LHT-55 involves the installation of a special steel dump platform. The rear and front PTO are also mounted. The equipment is equipped with attached lifting equipment.
LHT-55 Forestry crawler tractor in working condition
Onezhets-320. Crawler forestry tractor
The next stage of development of the TDT-55, Onezhets 300, deserves special attention. Much of the design of this model was taken specifically from the TDT-55, although the tractor is positioned as a completely independent model.
Price of used TDT-55
The cost of a used TDT-55 tractor depends on many different factors. The most significant ones include:
- year of issue;
- state;
- presence/absence of nodes.
At the moment, the price distribution for TDT-55 is as follows:
| State | Year of issue | Cost, rub. |
| on the run | 1985 | 350 000 |
| running, after major overhaul | 1990 | 800 000 |
| on the move, with new tracks | 1995 | 450 000 |
The cost is greatly affected by the location of the tractor itself. Typically, in the steppe regions of the country, the cost of this equipment can be several times cheaper.
