Pump, Water. PART NO: A-74008840. This water pump with gasket is completely new, from the seal to the housing. It has a 0.75" NPT threaded hole and fits multiple Allis-Chalmers Tractor models. (NOTE: Replaces 71370786, 71370786-R, 74008840-R, 4029129, 4035757N) Replaces 4035757N, 71370786, 4029129 casting # Dim A (1).750" NPT Threaded Hole. . MODELS: Allis-Chalmers TRACTOR: 200 Allis-Chalmers TRACTOR: 210 Allis-Chalmers TRACTOR: 220 Allis-Chalmers TRACTOR: 7000.