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Hydraulic testing

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Perchie15, Feb 15, 2025.

  1. Feb 15, 2025 #1
    Perchie15

    Perchie15 Light Load Member

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    Aug 16, 2021
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    Hey fellow mechanics what is your go to hydraulic testing equipment for diagnostic of any sort of issues I found some on Amazon but that’s some small lines compared to what our units have lol.

    But in the mean time can you help me on an issue we have a combo vac truck with a blower actuation issue. It’s on a 2020 kenworh T800 the set up is a west tech vac not for hydravacing. Anyways the issue is it takes forever for the blower to get working specially when it is cold out. Today it took the blower 30mins to kick in. We had switched out the control valve off the side of the Dan foss pump but didn’t do anything. As we were told it has little orifices that could be preventing oil to get through. So would the issue be in the drive motor for the blower or possibly the relief valve which is the lever operator this Brannon hydraulics company is calling it.
     
    Perchie15, Feb 15, 2025
    Perchie15, Feb 15, 2025
    #1
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  3. Feb 15, 2025 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Test equipment is expensive: I use a 3/4" flow valve. Found one like it at Northern Tool item 20480. Installed a 1/2 inch needle valve in the outlet side ( that was all I could find in a bind ). Have a tee on the inlet side with a gauge. There is no relief valve in this deal and requires extra precautions. Have pegged the gauge out at 34 GPM with larger pump at engine idle. When the needle is closing, pressure and flow both fall off the pump is bad. That is with no relief valves and such in the equation.
    I see larger ones available like Summit SKU: LFC - 12 N and stuff from Hydra Check. Or buy the real deal with a relief valve for about $4,000.00.
    Do not thank it is your pump because when the oil gets hotter, thinner, a bypassing "worn pump" gets worse not better.
    Sounds more like your pump is getting an air lock or a electric controlled dump valve is a problem.
     
    BoxCarKidd, Feb 15, 2025
    BoxCarKidd, Feb 15, 2025
    #2
    W923 and Heavyd Thank this.
  4. Feb 18, 2025 #3
    W923

    W923 Road Train Member

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    I would make an educated guess to say you have to much intake restriction when the oil is cold and thick and things are cavitating
    My flow/pressure tester is made by otc
    I believe it’s good for 75 gpm and 5000 psi
    I don’t know the model without looking sorry
     
    W923, Feb 18, 2025
    W923, Feb 18, 2025
    #3
    BoxCarKidd Thanks this.
  5. Feb 18, 2025 #4
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Saw a Moffit forklift do just that when it had the wrong oil put in it. It would kind of growl when cold also.
     
    BoxCarKidd, Feb 18, 2025
    BoxCarKidd, Feb 18, 2025
    #4
    W923 Thanks this.
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