Water Pump 6684225 6653941 for Kubota Engine D1402 Bobcat Loader 643 645 743 751 753 763 773 7753 1600 S150 S160 S175 S185. Replace Part Number:6684225, 6653941, 3974989, 3974989B. Bobcat Skid Steer Loader: 643, 645, 743, 751, 753, 763, 773, 7753, S150, S160, S175, S185.