Busak+Shamban provides flexible low temperature sealing for hydraulics in ski slope grooming machine

Busak+Shamban provides flexible low temperature sealing for hydraulics in ski slope grooming machine

Busak+Shamban provides flexible low temperature sealing for hydraulics in ski slope grooming machine

Busak+Shamban hydraulic seals in the Kässbohrer PistenBully vehicles resist extremes of temperature and provide assured sealing integrity in demanding applications and environmentally sensitive areas of operation.

‘PistenBully’ is a market-leading range of all-terrain machine for grooming ski slopes and traversing extreme, frozen terrain. Central to the function of the machine is the hydraulic system, which, operating in temperatures as low as -50°C, requires sealing which provides life-time security, since fluid leakage is unacceptable, particularly with operation in such environmentally sensitive regions as the Antarctic and the Alps.

Picture shows Kässbohrer PistenBully with example of Busak+Shamban seal used in its hydraulic system


For this application, worldwide seal developer and manufacturer Busak+Shamban was called upon to provide a system sealing solution. The sealing material was to offer maintenance-free, dynamic sealing, at very low temperatures, with inherent life-time flexibility. Furthermore, the seals needed to be friction and mechanically resistant and provide full life-time service. Busak+Shamban met this challenge with the development of seals based on a low-temperature FKM material that was already proven to Busak+Shamban engineers in other demanding semi-cryogenic applications, including seals within the 'pump nozzle' of liquid hydrogen refuelling systems where sealing flexibility and consequential integrity must be effective at temperatures down to –40 °C.

The sealing solutions provided by Busak+Shamban, within the PistenBully application have helped the German manufacturer, Kässbohrer Geländefahrzeuge AG, move on to launch the POLAR 300, their most advanced machine in the range with integral computer-controlled hydraulics. From a single tiller control, the driver is able to adjust the vehicle’s chassis height, manoeuvre the snow blades and grooming equipment, tension the cable, and control the winch. Sealing performance plays a major role in enabling the advanced hydraulically controlled features of the PitenBully to perform - it’s a true partnership in practice.