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  1. #1
    Platinum Member
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    Jan 2009
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    939
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    upstate South Carolina, Greenville
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    Kubota M6800, Massey Ferguson 240

    Default pressure washer not generating pressure

    My Northern pressure (6hp honda engine) is not generating any pressure. Last winter I had an accident and was out of commission for 6 months, so this washer sat outside all winter at my farm because I was not able to put things away. I did not winterize it and since I used it in the Fall and did not expect to leave it out. Weather here gets below freezing some but not much below 25 degrees occasionally.

    Surprisingly, it started right up so I was hopeful. But it does not develop pressure, or at least not normal pressure. I realize I can just buy a new pump for a couple hundred bucks, but before I do that, should I try to break it down and see if it can be repaired? I assume the pump is all it could be causing this. Thanks for any advice.

  2. #2
    Platinum Member
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    Nov 2008
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    870
    Location
    Covington, GA
    Tractor
    JD 870

    Default Re: pressure washer not generating pressure

    Take out relief valve to see if it is gunked up. Some pumps are relatively simple. Three rods wobbling about acting as pistons, some check valves and the pressure regulator. That said I messed with my old pump that was not working well. Blew out a seal when the pressure relief valve was not relieving. I got a new pump that actually has a warranty and parts from a local pressure washer repair shop. It works great. I did get some good money at the recycle center for all that brass from the old pump. Enough to pay for my fuel to get to and from the repair center.

  3. #3
    Veteran Member David_Kb7uns's Avatar
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    Aug 2005
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    1,089
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    Willamette Valley Oregon
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    Kubota X 4

    Default Re: pressure washer not generating pressure

    Not a good thing if it froze with water in the pump.

    David Kb7uns
    Grand L3130GST LA723 Loader, ATI grapple, ATI grapple bucket, WR Long front remote, Kubota rear remotes, Bradco 408 Backhoe with thumb, 60"KK brush hog, 60" RM Finish Mower, Speeco Post Auger, 72" KK rear blade, 60" box blade
    BX2230 LA211, RCK60, GCK60 Bagger,42"Land Pride Tiller, XB BB, XB RB, rake, Fimco 3PT sprayer
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  4. #4
    Platinum Member
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    Dec 2008
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    898
    Location
    Buffalo, New York
    Tractor
    318 John Deere, 4200 John Deere, 1947 John Deere "M"

    Default Re: pressure washer not generating pressure

    Check the parts list for what I believe they call an 'unloader-valve'. They are plastic, and I really think they're the 'freeze-protection'. I've froze/broke a couple in my Craftsman over the years. I was not happy, but it was a relitively reasonable fix........~Scotty

  5. #5
    Gold Member
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    Oct 2009
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    288
    Location
    Fleming Island,FL
    Tractor
    John Deere 2006 4320 CUT, 1970 Power King 2416

    Default Re: pressure washer not generating pressure

    Quote Originally Posted by Scotty370 View Post
    Check the parts list for what I believe they call an 'unloader-valve'. They are plastic, and I really think they're the 'freeze-protection'. I've froze/broke a couple in my Craftsman over the years. I was not happy, but it was a relitively reasonable fix........~Scotty
    Unloader valves are frequently the problem when the pump has no/ or low pressure. Another problem could be debris in any of the pump's intake or exhaust valves. Seldom does the pump completely fail unless it is one of the homeowner El-cheapo models.

    Jim

  6. #6
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
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    17,101
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    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: pressure washer not generating pressure

    What kind of pump is it. I would at least attempt to break it down, but you need a parts manual to order parts and put it back together correctly.

    These are some pressure washer pump break downs, not necessarily your pump.

    Item 28, ceramic plunger is usually the probably cause for no or little pressure.

    Inspect suction and delivery valves.

    http://www.etscompany.com/cometpump/Pump_Breakdowns.pdf

    http://www.shopetsonline.com/Replace...mps-s/1168.htm
    Last edited by J_J; 12-27-2011 at 08:46 AM.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  7. #7
    Elite Member
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    adirondacks

    Default Re: pressure washer not generating pressure

    Some things I have found when mine would not work. Some seals were bad, cost less then 25cents to fix. Air in the main hose going to the pump. Kinked line, main hose again. If you have mechanical skills you should atleast be able to find the issue, it may be simple and cheap or expensive?? I think it would be atleast worth checking into before kicking it to the curb.

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