A commercial-grade Karcher pressure washer pump is a primary component of electric and gas-fueled Karcher models. As with any pressure washer, the pump compresses incoming water, without which the water pressure would be no greater than in a garden hose. Due to the considerable force exerted upon a pump, it must be durably built. Pumps are rated to work at a certain pressure and water flow. Provided the specifications match, Karcher pumps may be installed on other pressure washers.
A pressure washer pump consists essentially of a manifold, commonly constructed out of brass which contains several cylinders. The cylinders are bored out to a particular diameter. Ceramic plungers are used in conjunction with stainless steel valves to build up the pressure of the incoming water. The water flow rate is affected by the RPM of the pump motor, the cylinder bore and the stroke. Karcher electric and gas-fueled pressure washers range from 1400 to 4000 PSI with a flow rate ranging from 1.3 to 3.6 GPM, so Karcher pumps will be designed within those specifications.
A Karcher pressure washer pump can cost anywhere from $150 to $900 depending on the model it is designed for. Karcher pumps are one of the most durable components on all Karcher pressure washers, and with proper maintenance it should last for years.