Your manual is ready for immediate download. 13. Classic 2000 Series Piston Motors MF 2020 Design Series 20 Parts Manual This manual contains the design and parts assembly for Design Series 20; MF-2020 20/21 Fixed Delivery Piston Motors. Please enter the following information. Name* Email* Phone*We cannot respond to your inquiry if the phone number is invalid.* all fields required & information private NameThis field is for validation purposes and should be left unchanged. This iframe contains the logic required to handle Ajax powered Gravity Forms.