I picked up this Karcher HD3500 and I've discovered the pump surges and the pump leaks oil. I've read about the unloader valve but I've been all over this pump and cannot locate it.
I think the oil leak is a worn O-ring as it's flush or slightly recessed in the housing, but the surging is pretty much, full pressure for a couple seconds, then no pressure for a couple seconds, etc. My well water supply is 6 GPM at the end of the hose, the unit is 4 GPM.
Can you tell by the pic where the unloader valve is? Can I run something through it to loosen everything up that may need it? I opened up the pump and everything looks ok, not a huge amount of build up, barely any.
I think the oil leak is a worn O-ring as it's flush or slightly recessed in the housing, but the surging is pretty much, full pressure for a couple seconds, then no pressure for a couple seconds, etc. My well water supply is 6 GPM at the end of the hose, the unit is 4 GPM.
Can you tell by the pic where the unloader valve is? Can I run something through it to loosen everything up that may need it? I opened up the pump and everything looks ok, not a huge amount of build up, barely any.