Impeller Replacement EXT APO Base UOM:EACH or a diverter fault

or a diverter fault

A solenoid with no supply is a wiring fault

If the belt is in good order and correctly tensioned

and the shape has to suit the space inside your recovery tank and the position of the inlet:

Impeller Replacement EXT APO Base UOM:EACH or a diverter faultOverview Replacement impeller for the external automatic pump out (APO) on HydraMaster truckmounts. HydraMaster part number 000 073 011, listed as Impeller, Replacement for any machine with external APO and, in later manuals, Impeller, Replacement for Posi Flow and Dura Flow. The automatic pump out empties the recovery tank while you keep working. When its impeller wears, the pump out slows, then stops keeping up, and the tank fills usually on the job