The 500 series floor drive gearbox is fitted to all models with the exception of the Lowlander 60, 80 and 150 (fitted with 350 series and 800 series respectively).  It is hydraulically driven to ensure an even feed of material to the spreading mechanism at all times. With a reverse feature, any foreign object too large to pass through the beaters can be easily removed. An adjustable crossline relief valve also delivers additional protection