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  1. #1
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    Pulsing while pulling trigger

    My pressure pro 5.6 gpm 2500 psi cold portable is pulsing when I pull the trigger. I noticed this last week when I was not hooked up to a supply tank and figured it was a supply issue. I hooked up to a 65 gallon supply and still getting the pulsing when I pull the trigger. I have looked at the check valves and they appear fine, so do the o-rings. The oil is not milky but I am changing it because it needs to be done anyway. I am also replacing the air filter. Any suggestions? Russ Johnson, I know you gave me a couple of possibilities on Friday but I have had a lot on my plate and was not able to get to fixing my pressure washer till now. Unfortunately I failed to write anything you said down and I have forgotten what you told me.
    Keenan Gilligan
    Monarch Pressure Washing LLC
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  • #2
    Member Associate Professor Pat Norman's Avatar
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    Did you check the water intake filter?

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  • #3
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    The water intake filter is clean. One possible cause I found while researching is clogged nozzles. I changed guns, and nozzles and it is still pulsing.
    Keenan Gilligan
    Monarch Pressure Washing LLC
    Knoxville, TN
    (757) 339-0738
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  • #4
    Member Junior Undergraduate Dirt Fighter's Avatar
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    It looks like you are not getting enough water to feed your machine.Try to remove the filter (I know you checked already but sometimes "looks clean" is not enough). Check your hose or put a new one and try without any nozzles.I hope this helps....
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  • #5
    Member Associate Professor Steven Rowlett's Avatar
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    Sounds like you have an air leak going to the machine. Check all of your connections.
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  • #6
    Member 7000 PLUS POSTER Scott Stone's Avatar
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    Air leak, or a really trashed seal on one plunger. Tighten the fittings, or you can run a hose over the fittings as the machine is running, and make sure it is not one of them.
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  • #7
    Equipment Expert 3000 PLUS POSTER Russ Johnson's Avatar
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    I'd say torn high pressure seal, especially if it behaves the same whether suction or pressure fed.

  • #8
    Member Junior Undergraduate
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    Quote Originally Posted by Scott Stone View Post
    Air leak, or a really trashed seal on one plunger. Tighten the fittings, or you can run a hose over the fittings as the machine is running, and make sure it is not one of them.
    Run a hose over the fittings? Can you explain that a little more?
    Keenan Gilligan
    Monarch Pressure Washing LLC
    Knoxville, TN
    (757) 339-0738
    http://www.facebook.com/#!/pages/Mon...68449173277370

  • #9
    Member Junior Undergraduate
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    Quote Originally Posted by Russ Johnson View Post
    I'd say torn high pressure seal, especially if it behaves the same whether suction or pressure fed.
    Russ, do you mean the high pressure seals for the packing? If so, can they be purchased separate or do I need to buy a whole new packing?
    Keenan Gilligan
    Monarch Pressure Washing LLC
    Knoxville, TN
    (757) 339-0738
    http://www.facebook.com/#!/pages/Mon...68449173277370

  • #10
    Member Honorary Professor Sirocco Jerry's Avatar
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    a great "quick test" you can do..
    Pressureize the inlet side of th pump, with a garden hose..
    you're looking for water coming out from under the head, if its your seals.
    ..but if you see no leak elsewhere, and the pressure pulsation doesn't go away..
    a high-pressure seal, or an o-ring under a check valve could be the cause.

    This is a reminder..
    People who plumb their tank-fed system to EASILY be "pressure-fed" for quick testing,
    can troubleshoot "rings around" their competition.

    ..another exerpt in my TroubleShooting and BulletProofing class.
    Last edited by Sirocco Jerry; 04-28-2013 at 08:59 PM. Reason: sp.
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  • #11
    Equipment Expert 3000 PLUS POSTER Russ Johnson's Avatar
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    Quote Originally Posted by KGILL View Post
    Russ, do you mean the high pressure seals for the packing? If so, can they be purchased separate or do I need to buy a whole new packing?
    Yes, the high pressure seal is the brown packing. I'd replace them as a set if one needs replacing.

  • #12
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    Also to all the above check to make sure your belts are tight and in good shape, one of our machines was doing this caused by the belt being worn and it was slipping causing it to loose pressure for a second!
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  • #13
    Exterior Restoration Specialist 21000 PLUS POSTER Ron Musgraves's Avatar
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    What do you do when pressure washer Pulsating
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  • #14
    Exterior Restoration Specialist 21000 PLUS POSTER Ron Musgraves's Avatar
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    Why is my Pressure Washer Pulsating
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