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Massimiliano Casini-Cherici +49 (0) 7303 - 92874 - 26

Forsttechnik ttv GmbH Dichtungen und Gleitlager

Forestry engineering

The forestry engineering sector is experiencing dynamic development, with the challenges of the future increasingly lying in the fields of semi-autonomous and autonomous driving technology.

In hard-to-access forest areas or on steep terrain, the autonomous driving systems with state-of-the-art on-board hydraulics provide first-rate support for drivers.

tv has specialised in significantly increasing the service lives and temperature resistance of cutting-edge drive units and functional components in the field of forestry engineering, with its development of customer-specific seals and slide bushings. According to a statement from Managing Director Harald Nitzschke, ttv is also offering drawing-based production parts from CNC processing in any defined quality.


Entire market in slight decline

According to surveys by the Kuratorium für Waldarbeit und Forsttechnik e.V. (German Center for Forest Work and Technology - KWF), 2016 saw a decline in the purchase of new machines in almost all machine classes in Germany, Austria and Switzerland.
In Germany, for example, around 9% fewer heavy machines were purchased for professional forestry applications than the previous year, and the same applied in the Austrian market, which suffered an even steeper decline.

The reasons for this are complex, and it appears that there is a trend for increased automation.

Maximum productivity is required

The requirements in the field of forestry engineering are clear: Increased productivity, more output increasingly intelligent solutions with assistance systems for the operators of forestry machinery. There is no magic solution here though, as it is also important to ensure a very good price-to-performance ratio in an extremely competitive world market.

ttv GmbH Dichtungen und Gleitlager Forst Wald

Product diversity in forestry engineering

The variety of products used in forestry engineering is huge, and these range from harvesters, forwarders and combi-tractors right through to special forestry tractors.

This wide variety of products and the high strains put on the technology call for maximum quality and individual solutions, both from the machine manufacturers and from the suppliers of components and assemblies on the market. These high demands also mean that the number of engineers employed in agricultural and forestry engineering has almost doubled over the last 5 years, making it an increasingly interesting profession with excellent career opportunities, including the chance to work abroad.

Best examples of development competence 

Despite only being small components, seals and slide bushings are often crucial for the service life and functionality of today's machines and vehicles. In recent years, ttv has designed a wide range of different solutions that have lead to significant increases in service life and temperature resistance.

ttv mechanical face seals

Inspired by the excellent results in other industries, our technicians have developed new mechanical face seals that have increased service life by over 32%. Installed in a split housing, the ttv mechanical face seals are pressed together with lapped running surfaces. An O-ring (NBR/FPM etc.) is usually used as a preload element, which fixes and aligns the seal inside the housing. Aggressive and abrasive media are prevented from getting into the seal, making it possible to guarantee increased wear resistance and service life.

Facts and figures

  • Service life increased by over 32 %
  • Entry of aggressive media prevented
  • Option of individual adaptation of material, shape and load capacity depending on the particular application

ttv cassette seals

It's a similar story with the customer-specific cassette seals.
Self-contained, pre-lubricated and with multiple sealing lips, these seals form a kind of labyrinth of seals. The actual sealing lip runs around a processed running surface in the inside of the seal, meaning that there are fewer demands placed on the shaft seat. The use of different materials for the component has increased the temperature load by 26% to 108°C, which has impacted on the service life in equal measure.

Facts and figures

  • 26 % increase in temperature stability
  • Labyrinth of seals for high levels of leak-tightness
  • All sizes and specifications are possible
  • Low demands in terms of the rotor shafts
  • Good, simple handling for replacement and repair

ttv special slide bushings

Our engineers have also been able to meet the increasing requirements in the area of slide bearing technology, in collaboration with our customers' development and design teams. This related to the improved application of the ttv-090/ttv092 or CuSn8 slide bushings. The desired results were achieved by the introduction of special oil grooves, modified clamping dimensions and design improvements.

Facts and figures

  • 16 % increase in pressure load
  • Improved primary lubrication and interval lubrication
  • Inclusion in the standard process in accordance with the drawing

Engineering Solutions

Anyone looking for innovative and noticeably better product solutions in order to stand out in the highly competitive agricultural engineering market would do well to come to ttv. We can find a solution to any problem. Give us a try!

A solution for every current requirement..

Project forestry




Seized drive unit on the forestry tractor.


To re-design the sealing solution in the further development of drive unit parts.


Drive unit on the feed, transmission gear unit and connection gear unit.


Developing a sealing solution to improve service life. The huge external impact caused by wood and plant residues combined with water and sand leads to the premature failure of common standard shaft sealing rings. Even additional radial and axial dust lips were only able to achieve the desired service lives to a limited extent in the initial series of tests.


Comparative simulations followed by initial sample test runs of different radial seals (WDR AS, WDR AS9, combi-WDR, cassette, mechanical face seal). The on-site evaluation and assessment of the results of these test runs and decision-making together with Technical Purchasing.


A ttv 24 cassette with adapted material is used, which in addition to the advantage of quick and easy assembly and replacement in the event of a revision, has also achieved a service life improvement of over 28% when being used directly by the operator.


Service life improvement of 28.9 %.