Ford TW, 30 Series TW15, 8630, TW20, 8530 Dual Power Shaft D8NN7017BA. Description for the Item. Dual Power Shaft Part Number: D8NN7017BA. Tractor & Plant Breaker. With Over 250 Tractors & Plant for breaking. Many parts available second hand for Ford, New Holland, John Deere, Massey Ferguson, Case, David Brown, Fiat, International, Zetor, JCB, Manitou, …