Koller was founded fifty years ago with
the initial development of the carriage SKA2.5, which has become legendary
in the meantime. The simple and tough design led to high popularity
of the carriage, not only in the Austrian forests. Shortly the market
had shown the demand of a tower yarder just as simple and tough as the
carriage. The idea of the tractor mounted tower yarder K300 was born
and implemented in record time. The K300 / SKA1 system was quickly launched
worldwide in the major forest regions. It is still the worldwide widely-used
tower yarder |
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| In the nineties the forest markets have started to differentiate. Overseas, for example in South America, there was a trend of mechanically driven tower yarders: simple, tough and inexpensive. In Central Europe, especially in Austria the forest sector was faced with manpower shortage, demand of rationalisation and demands in ergonomics. This was the beginning of full hydrostatic drives of tower yarders: line programming and radio control became possible. Shortly tower yarders were mounted on to trucks with loading cranes. |   |
| The K501 was the first machine covering both markets.
Equipped with automatic transmissions it was exported as mechanically
driven tower yarder. In Europe it was driven hydrostatically with pumps
and motors. Nowadays the K501 is replaced in the overseas markets by dozens of K601 and K701 Power Yarders. |
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The K507 tower yarder sets technological
levels in Austria. |
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