We need a manual for our pressure washer 3700 PSI, 13 HP-GX 390. How do we get this?

It has quite allot of hours on it so it has been used extensively. 283 hours on a pressure washer pump is about 27% of it's life expectancy. The good news is that it has a Honda engine. If it runs perfectly, looks like it has been taken care of, and has plenty of pressure, I would pay no more than around $400 for it tops. You are the buyer and the seller is wanting to sell. You have the upper hand in this deal. Offer $300 and then bargain.

Excell pressure washers used a series of numbers such as yours. I believe that that number will be for pump or pressure washer as a whole unit. Check Excell web site for a match. If you are looking for the engine model number check the fan shroud or valve cover or tag on engine itself. Good luck

Could very well be. Did you check the oil level and condition of oil? If its too full or if its light brown milky, then water has entered crankcase. Pressure washer pumps cannot stand to ever let run dry. Even a little. Also excessive idling will overheat pump if it doesn't have a thermostatic relief valve that allows some more cool water to enter pump.If it doesn't have one add one. Find your PUMP mfg and model number. IF it's pumping good now and no leaks, quick replacing the seals will save big future repairs. www.pressure-washer-parts.com has lots of info on many pump manufactures. Or get some seals from dewalt.

Go to this page:

http://www.jackssmallengines.com/help.cfm

You must have your exact engine model number listed on the side of the engine crankcase near the lower mount and oil plug.

Thanks for choosing FiXya.

Kelly

Make sure the engine is not full of paint or dust debris in it's cooling system. If the fuel mixture setting is very lean, it can cause overheating. Make sure the fuel tank vent is open to prevent fuel starvation. Does the engine seem to be running at full operational speed? If not, it will be short on developed horsepower. Make sure the water source is not partially shut off. Hope some of this helps!

inlet .006 exhaust .008

Sometimes you have to lower the air pressure in the tank to allow it to run. The back pressure from the compressed air in the compressor head overcomes the pressure created in the engine at the slow RPMs you are able to pull while attempting to crank it.

http://www.honda-engines.com/Engines_owners_manuals/ownersmanuals/gx390.htm

Hi, this is manual for engine only. maybe of some use.

There are no manuals for Dewalt at either of those sites.

I believe it is either one but if you are not sure, stick a screw driver in an see if it comes out with oil on it. Does one not have an oil level stick attached to the cap?