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Sudden high rpm

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Fritobandito
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2023/09/30 22:24:35 (permalink)
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Sudden high rpm

I have a craftsman 580.752520 pressure washer. I was using it today and suddenly the rpm jumped very high. Not surging, it stayed at the same high rpm. Sounds like it's gonna fly apart. I let it cool down and looked at all the springs and linkage on the carb. Nothing seems out of place. Full of oil and half full of good gas. What should I look for?
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    SRTsFZ6
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    Re: Sudden high rpm 2023/10/01 08:13:28 (permalink)
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    Sounds like the internal governor let loose..  They do wear out.
    It's usually a plastic gear and uses RPMs to keep the engine at 3,600 RPMs.
     
    The sump cover needs to come off and the governor should be right there.
     
    The model # you posted is for the entire machine, not the engine. 
    If you post the engine model #, we can look up the actual engine on a parts diagram.
     
    .
     
    .There should be some #'s stamped in the engine shroud.  In any event, this U Tube shows the governor replacement:
     
    https://video.search.yahoo.com/search/video?fr=mcafee&ei=UTF-8&p=briggs+7+hp+ohv+governor+assembly&type=E211US1498G0#id=1&vid=74aa435937519cdf6fdd73836ac36c75&action=click 
    post edited by SRTsFZ6 - 2023/10/01 13:33:02

    Scott
    Quote  #2
    Fritobandito
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    Re: Sudden high rpm 2023/10/01 12:20:51 (permalink)
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    All I see is engine family ABSXS.1901VB
    27969. 175 CC
    Owners manual doesn't really say a model number either
    Quote  #3
    SRTsFZ6
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    Re: Sudden high rpm 2023/10/01 13:33:58 (permalink)
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    See above added link, ^^^^^^ and click on it..
     
     
    .

    Scott
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    Fritobandito
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    Re: Sudden high rpm 2023/10/01 15:49:00 (permalink)
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    Thanks
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    Fritobandito
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    Re: Sudden high rpm 2023/10/02 12:09:51 (permalink)
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    Trying to attach a picture, may not work. It's model # is 11p902. The governor is definitely messed up. The metal pieces are twisted and one is cutting into the plastic shaft. Is this how they break or maybe something else let go and bent the metal.
    post edited by Fritobandito - 2023/10/02 12:11:09
    Quote  #6
    SRTsFZ6
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    Re: Sudden high rpm 2023/10/02 12:27:09 (permalink)
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    They don't break that often but it does happen..
     
    With the 3,600 RPMs when it lets loose, any/all parts are damaged-So, what your seeing is not unusual.
     
    Just make sure you get all bits and pieces out, and inspect everything around there..
     
    .

    Scott
    Quote  #7
    SRTsFZ6
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    Re: Sudden high rpm 2023/10/02 12:33:16 (permalink)
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    Also, here's a link on where to find the model # and help track down your engine and part:
     
    https://www.briggsandstratton.com/na/en_us/support/need-help.html 
     
     
     
    .

    Scott
    Quote  #8
    Fritobandito
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    Re: Sudden high rpm 2023/10/02 18:40:23 (permalink)
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    Got one ordered. Thanks for the help
    Quote  #9
    SRTsFZ6
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    Re: Sudden high rpm 2023/10/02 18:59:31 (permalink)
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    Yepper, post back how it goes...
     
     
    .

    Scott
    Quote  #10
    Fritobandito
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    Re: Sudden high rpm 2023/10/07 17:33:34 (permalink)
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    Tried to re assemble the motor but it doesn't seem right. When you push on the lever that the governor rides against, it's really hard to push. Then it goes all of the sudden. I'm guessing it should be a smooth easy movement, correct?
    I took all the linkage apart. It's like the plastic pieces on the carb all have wear on them and they are binding up.
    Quote  #11
    SRTsFZ6
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    Re: Sudden high rpm 2023/10/08 07:35:02 (permalink)
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    Engine off, moving the linkage between the carb and the governor "arm" should be very light (if you have a moveable throttle control) which is set to idle..
     
    Engine still off, moving the linkage between the carb and the governor "arm" should be stiffer if the throttle is set to fast
     
    Did you re-adjust the governor arm that attaches to the shaft that comes out of the block?
    (There's many You-tubes on setting it). 
     
    .

    Scott
    Quote  #12
    Fritobandito
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    Re: Sudden high rpm 2023/10/08 14:01:16 (permalink)
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    This engine has no throttle control. I didn't adjust the governor arm. When I detach the linkage that goes to the carb off the governor arm, it moves easily and smoothly. When it's all hooked up, it takes a lot of force to move it. Then it kind of goes all at once. I ordered a carb with all the plastic parts on it. Hoping that's where the binding is happening.
    Quote  #13
    SRTsFZ6
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    Re: Sudden high rpm 2023/10/08 19:35:07 (permalink)
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    There's many u tubes on setting the governor.  
     
    Just to make sure that isn't the problem, to set it:
        -Push and hold the throttle wide op(maybe have a helper).
         -Loosen the bolt at the base of the governor arm. 
          -Turn the shaft (that goes into the engine), in the same direction as if it 
                   were pushing the throttle wide open.  Lock it down. 
     
    If set backwards, and locked down, the throttle will be locked up and have no
    back and forth movement (engine not running)..
     
    .
     

    Scott
    Quote  #14
    Fritobandito
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    Re: Sudden high rpm 2023/10/08 20:48:56 (permalink)
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    No throttle, it's a pressure washer. It was fine until the last time I used it. It just revved up too high as soon as I started it. I'll see how things move when the new carb comes in
    Quote  #15
    SRTsFZ6
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    Re: Sudden high rpm 2023/10/09 07:31:17 (permalink)
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    Just an FYI,
    The governor is set the exact same way, whether you have an adjustable throttle or not. 
     
    I'd suggest re-setting it in any event..
     
    .
     

    Scott
    Quote  #16
    Fritobandito
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    Re: Sudden high rpm 2023/10/10 14:13:11 (permalink)
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    Well, good news. It runs right again. The old carb linkage had enough play in it that it wouldn't turn in a smooth arc. It would push upward and bind. About 50 bucks in parts. Thanks for your help.
    Quote  #17
    SRTsFZ6
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    Re: Sudden high rpm 2023/10/11 08:40:59 (permalink)
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    Glad you found it!  And your welcome.
     
    .

    Scott
    Quote  #18
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