These pumps are designed to run off a power take-off with the correct rotation and RPM. Ensure clearance exists for the pump. Consult the engine manufactureräó»s manual for mounting locations. Alternatively, pumps can be driven off an electric motor. Use 3HP @ 1800 RPM, #182 frame, 'C' face, 'Y' connection. When driving off an electric motor it is best to use a flexible 'Spider' coupling to compensate for misalignments, which may cause premature wear. Pumps are all 4gpm.