Item Description Hydro-Gear ZK-GCBH-SBRA-36T3 hydrostatic transaxle assembly. This model belongs to the ZT-2800 series, designed for zero-turn mowers and lawn tractors. Hydrostatic integrated pump & motor. Cooling fan and drive pulley included. No wear, no leaks, no defects. Fits machines requiring a ZK-series / ZT-2800 Hydro-Gear transaxle.