A “Direct Drive” pump has a hollow shaft, which simply slides onto the drive shaft of a motor or engine. The flange on the pump is mounted to the face of the engine or shaft end of the motor. Normal gasoline engine speed is about 3450 RPM. Since the pump is connected directly to the engine shaft, the pump RPM is the same as the engine RPM. Direct drive pumps allow for a more compact designed pressure washer. With fewer moving parts it is therefore less expensive , but additional wear and tear on bearings and other parts can reduce the life span of the pump.
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