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  1. #1

    Join Date
    Dec 2004
    Posts
    275
    Location
    Newberg, Oregon, USA
    Tractor
    JD 790

    Default Adding a Hydraulic Pressure Gauge?

    Has anybody added a hydraulic pressure gauge to their tractor? I was thinking it would be kind of nice to have a feel for how hard it is working. Also have thought about eventually adding the JD shim kit to the pressure relief on my 790 and would want to know how high it runs then.

    If you wanted to do this, would you just tee into the high pressure line right out of the hydraulic pump with a narrow gauge line and make real sure to get all the air out? I have seen hydraulic gauges that ran up to 3000 pounds full scale for $10 to $15. Seems like it would be worth it to have a feel for how much load you've got on the hydraulics. I even saw one that was panel mount with the fitting on the back.

  2. #2
    Super Star Member kennyd's Avatar
    Join Date
    Jul 2003
    Posts
    11,470
    Location
    Westminster, MD
    Tractor
    John Deere 4110

    Default Re: Adding a Hydraulic Pressure Gauge?

    I made one that just plugs into a QD, I used it to check the pressure on my tractor.

    Here is a Picture

  3. #3
    Veteran Member
    Join Date
    Feb 2004
    Posts
    1,906
    Location
    Brazos County Texas 77808
    Tractor
    Kubota L3130HST w/LA723 loader

    Default Re: Adding a Hydraulic Pressure Gauge?

    I did the same as Kenny but simply screwed my guage into the male QD. With my setup, it is easy to see from the seat.

    Vernon

  4. #4
    Gold Member ZJ_HR's Avatar
    Join Date
    Oct 2003
    Posts
    411
    Location
    Croatia
    Tractor
    '02 Same Argon70 4WD, '81 Store 402 4WD

    Default Re: Adding a Hydraulic Pressure Gauge?

    If you add one like Kenny showed, you'll just measure relief valve pressure.
    I added one for checking working and relief pressure.
    Range is 250 bar = 3625 psi
    Attached Images Attached Images

  5. #5
    Gold Member ZJ_HR's Avatar
    Join Date
    Oct 2003
    Posts
    411
    Location
    Croatia
    Tractor
    '02 Same Argon70 4WD, '81 Store 402 4WD

    Default Re: Adding a Hydraulic Pressure Gauge?

    And connected in series with cylinder, left from rear working light...
    Attached Images Attached Images

  6. #6

    Join Date
    Dec 2004
    Posts
    275
    Location
    Newberg, Oregon, USA
    Tractor
    JD 790

    Default Re: Adding a Hydraulic Pressure Gauge?

    I would like a gauge that I can easily view at any time from the operator position so that when I pick up a heavy load, I can easily see how close to the limit I am.

    Is there some problem with running a small gauge line from a TEE right out of the Hydraulic pump to the gauge in a more convenient location? Since there is no flow in the line to the gauge, even something like 1/8" line shouldn't cause any appreciable effect on the system or the gauge readings.

    That way I can see hydraulic pressure for any cylinder as I actuate it, even the rockshaft. This would also serve as a "poor man's" scale. You could calibrate a conversion table and know how pressure translated to weight in the bucket lift or bucket tilt, or a load on the rockshaft. The only downside is that it wouldn't show holding pressure, just the pressure when actuating it. The only way a cylinder could see higher pressure than this gauge showed would be if you dropped additional weight into a bucket that was being held in position.

    The biggest nuisance to this is that when you release the SCV, the pressure would drop back to idle. Perhaps you could create a "peak hold" circuit with a check valve that could be released with a pilot input or electrically. Hummm....

  7. #7
    Platinum Member v8dave's Avatar
    Join Date
    May 2004
    Posts
    617
    Location
    Northern, Calif.
    Tractor
    Kubota 7610

    Default Re: Adding a Hydraulic Pressure Gauge?

    Be careful, gauge needs to be hooked up with proper lines and fittings. A high pressure hydraulic fluid leak could penetrate your skin. Use steel lines and fittings intended for the pressure.

  8. #8
    Veteran Member
    Join Date
    Dec 2001
    Posts
    1,054
    Location
    Minnesota
    Tractor
    JD 4100 HST

    Default Re: Adding a Hydraulic Pressure Gauge?

    If you put the gauge between the loader boom lift cylinders and the SCV, it will show the pressure holding the bucket up regardless of the valve being open or closed. The setup with the tap between a male and female quick-connect might be ideal for this, or you could plumb it in on the loader itself and mount it up on the arm or something.

    You can see dynamic pressure spikes that significantly exceed the relief pressure setting when the valve is closed if the load is bouncing up and down or you are ramming the tractor into a heavy pile.

    Think of it this way - what would happen to the loader if you were to suddenly cut the hose going to the lift cylinders? It would fall to the cround. Unless it is resting on the ground or otherwise blocked up, there is pressure in that line holding it up.

    Except when the loader is resting on the ground, you will need to subtract the pressure caused by the empty weight of the loader from all values. Zero payload weight will not be zero pressure.

    Many loaders have a fairly non-linear lift geometry leverage curve. The pressure for a given weight will typically be higher at full height than down near the ground. You will want to calibrate your "scale" at a given lift height - preferably down near the ground.

    - Rick

  9. #9
    Super Member Henro's Avatar
    Join Date
    Jul 2003
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    5,294
    Location
    Few miles north of Pgh, PA
    Tractor
    Kubota B2910, BX2200, Yardman 20HP pos...

    Default Re: Adding a Hydraulic Pressure Gauge?

    <font color="blue"> I would like a gauge that I can easily view at any time from the operator position so that when I pick up a heavy load, I can easily see how close to the limit I am. </font>

    tomrscott,

    I've done a lot of loader work with my tractor over the last couple years. A LOT...

    I grabbed onto that quote above, because I can't think of a reason why I would need to know when I was approaching the limit of the loader. The loader tells me when I have reached its limit, and reaching the limit does no damage, just trips the pressure relief valve and I immediately back off and do what is necessary to lift less and get the load back within the limits of the loader.

    I can understand the desire to have extra information and all that. I just don't see a practical need for such information.

    In the past I considered adding a pressure gage like you are doing. I thought about it and in my case wrote it off as unnecessary. I am sure you can install one simply. One of the long time posters here has done it. I remember the post and want to think it was a blue tractor, but it has been a while and I don't remember who the poster was.

    You certainly can add one and it will work like you think it will. If you are using it to gage weight you may have to also consider the geometry of the loader linkage, at different heights, if you want accuracy.

    If you put the gage on the output side of the loader valve it would show holding pressure, but then would not show system pressure when other implements were operated.

    I think you need to add at least two gages... [img]/forums/images/graemlins/grin.gif[/img]



  10. #10
    Gold Member ZJ_HR's Avatar
    Join Date
    Oct 2003
    Posts
    411
    Location
    Croatia
    Tractor
    '02 Same Argon70 4WD, '81 Store 402 4WD

    Default Re: Adding a Hydraulic Pressure Gauge?

    If you make T connection with hose and manometer just behind pump, you'll see pressure just during lifting.
    If you want to measure "weight" in loader, you need to connect T with manometer in lifting hoses circuit. Just make something like on my first pic, put high pressure hose between T and manometer and install it in fast connectors toward lifting cylinders.
    But, as somebody mentioned, your loader has overload valve anyway, so you don't really need it.
    I made and used this gauge when I had jerking during lifting hopper on my corn picker, and wanted to detect problem.

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