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  1. #1
    Gold Member
    Join Date
    Sep 2004
    Posts
    329
    Location
    PA
    Tractor
    2011 JD 110TLB, 2000 John Deere 4300, 1946 Ford 2N, 1979 Cat D3 and 1966 John Deere 450 Dozer

    Default Pressure Washer - Low Pressure

    I have a 2.5GPM pressure washer with Honda 5Hp motor and DeVillbiss pump. I turned it on to use and it worked for 1 min then the pressure quit and only sprays mist. I took everything off that I could to check for something clogging it and found nothing. Im not sure how i would tell if the pistions in the pump are bad but they looked fine to me. The rubber seals around the pistons are fine too. i checked the pressure adjustment and was never fiddled with. I am thinking about buying a new gun/wand and trying that.

  2. #2
    Member
    Join Date
    Feb 2004
    Posts
    38
    Location
    Connecticut
    Tractor
    Challenger MT295

    Default Re: Pressure Washer - Low Pressure

    As a guess, it sounds as if the pressure washer's suction is starved or a suction check valve is leaking.

    With the engine off and the wand hooked up, try supplying water hose pressure to the pressure washer. Press the wand trigger and you should see a small solid stream of water. This verifies that there are no clogs that are limiting flow.

    With hose pressure still applied, start the engine up and press the wand trigger. If you get a low volume spray, this indicates the suction check valve(s) are leaking or the piston seals are worn. Since you checked the piston seals, I'd clean the suction check valves and try again.

    Your pressure washer worked OK for a while, so it is probable that junk is keeping one suction valve partially open. Hopefully this will be an easy fix!

    Lou Braun

  3. #3
    Gold Member
    Join Date
    Sep 2004
    Posts
    329
    Location
    PA
    Tractor
    2011 JD 110TLB, 2000 John Deere 4300, 1946 Ford 2N, 1979 Cat D3 and 1966 John Deere 450 Dozer

    Default Re: Pressure Washer - Low Pressure

    Where are the suction valves and what do they look like?

  4. #4

    Join Date
    Jan 2005
    Posts
    175
    Location
    South Central, PA.
    Tractor
    Various: J.D. 110TLB, 320S.S., 4010, 445, 757

    Default Re: Pressure Washer - Low Pressure

    Just a thought, I have a similar unit. Occasionally I will get in too much of a rush and either forget to purge the lines ( feed hose and wand hose) by allowing some water to run through the system under feed pressure only. When I do this I will get only a fine mist. I have to shut the unit down, and run feed water through until all the air is purged.

  5. #5
    Silver Member
    Join Date
    Jun 2004
    Posts
    192
    Location
    Where VA, WV, and MD meet
    Tractor
    John Deere 4110

    Default Re: Pressure Washer - Low Pressure

    I have a similar problem that I was going to ask about. Here's what mine does...

    When I start it, it works for a short time (less than a minute) and then only squirts water at regular hose pressure. I can only get it to "catch" by dropping the engine RPMs really low (almost to cut-off) while holding the trigger. At that point, the pressure aspect starts up again and I can raise the RPMs some. If I let go of the trigger and try to spray again, I have to repeat the steps. Also, I cannot use tips that allow a lot of water flow (above 25 degrees) as I can never get the pump to catch...

    Test yours and see if the problem is similar. Anyone have ideas on solutions?

  6. #6
    Silver Member
    Join Date
    Dec 2003
    Posts
    107
    Location
    Finger Lakes, NY
    Tractor
    Kubota B3200HSD, JD 318

    Default Re: Pressure Washer - Low Pressure

    I think I have the same unit that I bought new at Lowe's. Same thing here. It'll work fine for a while then loss of pressure. I'll wait a minute, press trigger a few times, and it works fine again. Only happens once in a while, and not every time I use it. Weird stuff.

  7. #7
    Gold Member
    Join Date
    Sep 2004
    Posts
    329
    Location
    PA
    Tractor
    2011 JD 110TLB, 2000 John Deere 4300, 1946 Ford 2N, 1979 Cat D3 and 1966 John Deere 450 Dozer

    Default Re: Pressure Washer - Low Pressure

    I did buy my pressure washer at Lowes too. I cannot get mine to build up pressure at all.

  8. #8
    New Member
    Join Date
    Nov 2004
    Posts
    11

    Default Re: Pressure Washer - Low Pressure

    It could be your water supply at your house. I have lived at two different places that the water supply could not keep up. Both places had well water. Those problems actually left a bad taste in mouth regarding pressure washers, and I was reluctant to buy one for myself (I borrowed the others). My new washer is great so far. It is the next model up from yours (I think), the Excel 2750psi 6HP Honda with the fancy "water broom" (actually pretty handy) I got it at Home Depot.
    If there is any air in the lines anywhere, that will cause it to act as you describe. If that's the case, the o-rings will blow out of the wand soon.
    If you have public water, then my input probably is not valid because you can be pretty sure that supply will keep up.

  9. #9
    Super Member
    Rest in Peace
    frank_f15's Avatar
    Join Date
    Mar 2001
    Posts
    6,033
    Location
    BUFFALO ,NEW YORK AREA
    Tractor
    kubota b2400- R4 tires

    Default Re: Pressure Washer - Low Pressure

    1st of all check the inlet screen to the washer(where the hose hooks up) AND THEN TAKE THE WAND NOZZEL APART. i had the same problem last year and seems the nozzel plugged up.

  10. #10
    Gold Member
    Join Date
    Sep 2004
    Posts
    329
    Location
    PA
    Tractor
    2011 JD 110TLB, 2000 John Deere 4300, 1946 Ford 2N, 1979 Cat D3 and 1966 John Deere 450 Dozer

    Default Re: Pressure Washer - Low Pressure

    I made sure that the filter screen at the hose connection is clean. I took the wand apart twice and didnt find anything wrong. I took the brass valve body off the pump and didnt find anything that would cause a problem. If I connect the water supply hose to the valve and disconnect the wand hose from the valve, with motor OFF I get a fine stream of water shooting out (couple feet) like I did when I did not have a problem. I am not sure that means anything though.

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