Pump, Water. PART NO: A-79003713. This water pump is completely new, from the seal to the housing. It has no bypass hole and fits multiple Allis-Chalmers Tractor models. (NOTE: Replaces 79003713-R) Dim A (1)No Bypass Hole. . MODELS: Allis-Chalmers TRACTOR: A Allis-Chalmers TRACTOR: B Allis-Chalmers TRACTOR: C Allis-Chalmers TRACTOR: CA.