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Why is oil coming out the side of my pump, I just changed the oil and it started doing this? I own a Porter Cable 4,000 PSI.

Please tell me some things it could be. Can I put a stop leak additive in the pump itself to stop oil from coming out. It leaks when machine is on. I still have good pressure. This leaking just started when I changed oil. Can I put a thicker oil so it won't leak?

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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.

Posted on Jan 23, 2013

  • 1 more comment 
  • Michael Longway Jan 23, 2013

    My model # is PCK4040SP. I have both a dip stick with 2 holes in it and an oil site glass. I think I have too much oil in it. I'm filling it almost to the 2nd eye of the dipstick. I will clean all oil off machine, run it, and then see where it leaks. I need to know how much oil to put in.

  • Repair Ahjoshe Jan 24, 2013

    The manual says to fill it with 18.54 oz of 30W non-detergent oil. Go by the site glass, that's your most accurate measurement. Fill until the oil level is half way up the site glass. If you want a copy of the manual, you can down load it athttp://servicenet.dewalt.com. Just search on your model number in the find parts box.

  • Michael Longway Jan 25, 2013

    Thank ou Very Much!!! I did all that you said concerning oil fill level & IT WORKED

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