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Check on ebay for a place called outdoor concepts he has diagrams, parts and even replacement pumps. A new pump is often cheaper to buy than fixing old one!
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do you mean it keeps trying to build pressure even when you release the trigger on your wand???that is a problem with your unloader....also checkout your shutter valve and replace the oring on it. You will need the diagram here to know what parts Im talking about Pump Breakdowns and you can order parts here Pressure washer parts catalog quick links Pressure Washers High Pressure...
The Dewalt 3100 came with 2 different pumps. The Blue Cat pump and the oil free pump that was made by DeWalt. You may just have a bad Thermal relief Valve on the unit.
You can find the parts diagram at www.allpartsinc.com
Your unloader valve is not wotking, get a diagram of the pump from cat and it will show what parts you need to replace, or check for blockage in the valve.
If you ran the pressure washer without water running through it on startup you probably got your pump.You are supposed to engage the trigger on start up with water running through it so as to release the pressure off the pump so it will start easier. Hope this might help you.
Do you plan on doing the repair yourself. I need more info, when you supply water to the pressure washer, pull the trigger to purge air from pump, and start the machine. Do you see water coming out from the bottom of the pump? Do you hear the pump working or is it quiet. If you hear a cycling pattern or hear the pump trying to push the water out but it isn't, then you may have a blockage inside the trigger or the spray tip. If the pump isnt building pressure then you may have a pump problem. A stuck check valve, cracked plunger, bad seal, or could be air bound.
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