Hydro Pump When ordering and replacing a hydro pump, always replace the wheel motor and lines, flush the tanks and install a new oil filter. Not doing so could cause the hydro pump to fail due to contamination in the system., Proven performance using patented technology, World leader in lawn and garden industry, Guaranteed quality for less, For proper ordering, reference Hydro Gear part number stamped on hydro pump. Fits Models: Exmark Lazer Z Serial No. 370,000 and newer; 52", 60" and 72" decks; Hydro Gear BDP-10A Series; Toro Z 250's Z Master 742XX Series, 52", 62" and 72" decks; Z 500's Z Master, 2004 and Newer Hydraulic Group, 60" and 72" decks Replaces Part Numbers: Hydro Gear BDP-10A-427, Hydro Gear PG-1GAB-DY1X-XXXX, Ariens 02964400, Exmark 103-2675, Toro 103-1943 Stens Part Number: 025-007