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  1. #1
    Bronze Member
    Join Date
    Oct 2006
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    56
    Location
    south MS
    Tractor
    Kubota L4400, Cat 303.5 excavator, John Deere 870

    Default Tire pressure?

    What is the proper tire air pressure for my John Deere 870 tractor tires? They are ag tires and the rear's have water. Currently the rears look squatty and are evidently low on air pressure. Is there a general pressure that applies to most tractor tires or are they all different? What about ag vs. commercial?
    Eddie.
    Kubota 4400DL, FEL, toothbar, Speeco quick hitch, 5'disk, 5'rear mower, 5'rake, 5'harrow, turn plow, 5'box blade, middle buster, subsoiler, 4'finish mower, boompole, Dehner grapple w WR Long 3rd valve.

  2. #2
    art
    art is online now
    Super Member
    Join Date
    Apr 2000
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    6,130
    Location
    central New York
    Tractor
    all makes and models

    Default Re: Tire pressure?

    Go for a flat bar on the ground. Depending on loads and make of tire it does change.

  3. #3
    Platinum Member adirondackmtnman's Avatar
    Join Date
    Jul 2012
    Posts
    761
    Location
    Black Brook, NY
    Tractor
    JD 5045D

    Default

    Quote Originally Posted by art View Post
    Go for a flat bar on the ground. Depending on loads and make of tire it does change.
    X2, I always inflate until the outside of the tread begins to rise, then deflate until the outside just touches. Works best on a concrete floor, as Art stated, you will need to compensate some for weight on the front or back...be careful going too low. I did that on my first tractor, spun the rim inside the tire, and tore the valve stem out of the tube spilling my ballast all over the yard. Needless to say, $200 bucks later, I had learned my lesson...

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  4. #4
    Platinum Member oosik's Avatar
    Join Date
    Aug 2012
    Posts
    649
    Location
    AMBER, WA
    Tractor
    Kubota M6040

    Default Re: Tire pressure?

    I have specific pressures for front & rear tires (from owners manual) but generally follow what adirondac says for the rear. Probably best for you to find an owners manual. That will tell the pressures by tire size - and yes, the pressure does vary by size. I run max allowed in the front tires - I have a FEL and do move heavy loads with it.

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