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Re: What type of oil do I put in the high pressure pump...
Regular motor oil is incorrect, the pump has a metal tag that clearly states that it uses 75w90 gear oil, and fill up to the middle dot on the sight glass.
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Moisture and oil in small amount is normal with oil type compressors, a by product. If there is no air leak between the pump and tank, suspect worn piston rings, worn out faulty valves, loose pump head.
You didn't state your model number so I don't know exactly which type pump you have. With that; there is no 'oil pressure' in power washer pumps. The internal parts work in an oil bath/splash environment and the pump body is vented, usually at the oil fill cap. Thicker oils and stop leak will only mask the problem and make the pump work harder. Where the oil is coming out is key to the problem. Clean the pump well with something like dish soap to remove all excess oil to find exactly where it's leaking. If it's leaking at a part joint, like the pump body to the valve body or at a bolt, you may have a bad gasket or cracked part. If it's coming out the oil cap a likely cause is there is too much oil in the pump. When oil gets hot it expands and will find a way out. If you have an oil site glass, make sure the site glass is only half full of oil. If it has a dipstick, make sure you have the right dipstick and only fill it to the full mark. Most pressure pumps only need to be half full but that is dependent on your particular pump. If you have it consult your owner's manual. If you don't have the manual you can go to http://servicenet.dewalt.com, search for your model number and see if the manual is still available.
If you need an engine manual, then look up the manual on the engine manufacturer's web site. eg Briggs & Stratton, Honda, Techumseh. Porter Cable manual would just have cart and pump info.
you will have to try the following start up purge up onece with just water then start the powerwasher if that does'nt give u pressure ther is gaskets inside the pumping sometimes 4 to 8 of them these might be to wore down to hold pressure if u can locate the pump and desemable it run it to ur local dealer tell u need new gaskets put into it
check your in take screen make sure its not plugged, look for calciumbuild up. then check your valve there should be six of them. my be damaged or weiring out and or plunged. if all looks good you'll need to check your unload-er valve. check your oil to make sure no water is in there, ok. good luck, let me know.
You should check that the oil reservoir for the pump has oil in it. It sounds like it may be low. Also, if it is a gas model, the engine oil may be low.
Remember the pump oil reservoir should be only 1/3 to 1/2 full of non-detergent oil.
non return valve on syphon injector on high pressure outlet stuck or 'o' ring worn. remove barb should be a spring and ball bearing in there. it may be that the spring has broken too.
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