The ROSTA tensioning element type SE-FE is designed for front mounting applications on engines such as cooling compressors and fan drives. Steel parts are black painted.Today nearly all busses for passenger transport are equipped with an air-conditioning system. The diesel engine of the bus serves thereby as an energy source of the cooling compressor. The piston or rotation compressors are driven via Polly-V belts from the spur wheel of the main engine. This belt transmission requires a slippage-free power train to ensure the full capacity of the cooling compressors.ROSTA designed this specific application for a heat resistant tensioner - powerfull, compact with a long compensation travel.