An ice making machine has a mechanical compartment and a water compartment that houses a water system, and a pump assembly. The pump assembly includes a motor and a pump housing connected to the motor. The pump assembly is mounted to a base between the machine compartment and the water compartment so that the pump motor is located in the mechanical compartment, but can still be removed through the water compartment. A mounting flange attached to the pump assembly extends radially beyond the circumference of the pump motor. In one embodiment, a pump opening in the base has a collar integrally formed with the base. The collar includes a sealing section and a latching section. When the pump is inserted through the pump opening, snap latches in the latching section engage the mounting flange to hold the pump in place and the sealing flange seals against an inner surface of the sealing section.