Water coming out at pressure ajustment - Northstar Pressure Washer 3000 PSI

Water pressure from city side should be. (Minimum 20 psi ) Maximum (80 psi ) If sump tray is filling up and water valve is cutting off then water supply is ok. If you are not getting enough water over the evaporator plate then you need to make sure the distribution tube is not stopped up with. if it is clear then replace the water pump.

Adjustments- if any- are for the throw out bearing
to pressure plate clearance

No adjustment will fix slipping

You may need the flywheel machined & a new
clutch disc & pressure plate

hi have you tried bleeding the rads this should solve the problem somewhat ,you will need to ajust the overflow in the water tank also but make sure to bleed the rads goodluck

The tanks useally come with the pressure set in them, if you messed with yours call a place where they sell em and give you size and model and they will tell you,,,,also if the little tag that comes on the tank is still there it says right on the tag,,,Another thing that pump has a control to ajust the water pressure all water pressure to a home should be at 50lb,s look at you gage and see if it is going off at 50lb if not it might be the proplem,the little box with adjusting spring in it.I have seen these go bad.

The water inlet level setting could be faulty and thus "overfills" the washer with water. The water level is senced via a plastic tube feeding an ajustable switch. Sometimes the plastic pressur sence pipe gets clogged and water level is then not correct. The switch can have burnt contacts and might need replacing.

If your machine is recent it is a v3 which comes with an adhustable over pressure valve. It is possible to test the pressure (without the expense of a gauge) be using the balnking disc and measuring flow with a measuring jug (or scales) and a watch. check the make of pump and google for it - the Rancilio site also has the data flow rates for the pumps used. If you get the correct flow rate - the machine is fine and it comes down to grind and tamp... the stuff of alt.coffee and countless forums. Also have your freind use his coffee in your machine and see if he gets different results to you.

check to make sure the water level in your tank is sufficient, if not you'll need to ajust your float. otherwise your flapper is shutting too soon, you'll need to shut the water valve off and flush untill the water in the tank is gone, letting air back under the flapper slowing it's desent when submerged. then turn the water back on. if the problem continues repace the flapper.

CLR
BUY SOME CLEAN OUT THE HEAD REINSTALL HEAD USE AS PREFERED
also check you are ajusting the head right
failing that buy a new head

Usually happens when the stops and not ballanced(hot and cold pressures going to the faucet). Try ajusting the stops; open more on the hot or close more on the cold. 

replace the water pressure switch it is non ajustable for insurance purposes