I have just bought a Harben pump that needs repairing. But I would like to know the pressure and GPM before I repair it. It has a 6.5 hp single cylinder diesel engine on it with a 4.1 gearbox there are 3x20 mm diaphragms on the pump. I was wondering if you could tell me the pressure and gpm. Someone has said it is 2000 psi at 4 gpm which is not a lot for the size of this unit. I was wondering if you could help me?
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