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  1. #21
    Super Star Member Diamondpilot's Avatar
    Join Date
    Jan 2007
    Posts
    13,834
    Location
    Daleville, IN
    Tractor
    Jinma 254/284 Ford 861 Powermaster at work

    Default Re: Air Pressure in Loaded tires.

    I agree with most here. I bring mine up to the normal pressure. Just pull the tractor with the valve stem at 12 o'clock and check them.

    Chris

  2. #22
    New Member
    Join Date
    Feb 2005
    Posts
    11
    Location
    Virginia
    Tractor
    Kubota B3200 HSTw/R4s

    Default Re: Air Pressure in Loaded tires.

    I may be making a stupid point but here goes! What about the extra weight exerted on the tires when you have something on the 3PH? I'm thinking along the lines of say a 400 pound implement whose center of gravity is say 5 feet behind the axil of the tractor. If my memory serves me, the torque on the axil/tires would now increase by 2000 pounds. Wouldn't that cause some bulging of the sidewalls and thus wear on the outsides of the tire. I imagine that it's not much of a problem when the implement is engaged with the ground but when you are transporting or say moving 600 pound hay bales on a bale spear for some distance, wouldn't you want the tire pressure more in line with a load and not so much an empty tractor. And not to put too fine a point on it, the torque with any load increases a great deal when bouncing around during transport. Could that cause problems if the pressure is too low? Please tell me if I'm over-thinking this!
    2010 B3200 with FEL
    Farm Force Post hole digger
    60 inch landscape rake

  3. #23
    Elite Member Mace Canute's Avatar
    Join Date
    Nov 2006
    Posts
    4,201
    Location
    Saskatoon, Saskatchewan

    Default Re: Air Pressure in Loaded tires.

    Movintgt, that's correct. Tire pressures need to vary with the weight they support. This is easily evident when you think of the front tires on a tractor with a FEL compared to the ones on a tractor with a 3PH mounted implement. What's correct for one is totally inappropriate for the other. It holds true for rear tires as well, of course.

    I posted this before in this thread, post#16 to be exact...

    "Tires are designed to operate at maximum efficiency when they are at their Rated Deflection. With the tractor on a hard surface, deflection is the distance from the axle center to the ground surface divided by the distance from the axle center to the top of the tire. In technical terms, deflection is the value of the loaded radius of the tire compared to the unloaded radius. Rated deflection is the amount of deflection when the tire is deformed to its optimum or design footprint. Rated deflection for radial tires is about 85%, for bias tires it is about 90%. The correct pressure to achieve rated deflection depends on the load the tire is carrying. A correctly inflated radial tire will have a significant sidewall bulge or "cheek'. It may look low or flat but it is not. If you inflate a radial tire by "eyeball" until the sidewall bulge looks like that of a bias ply tire, you lose most of the performance advantages of the radial tire."

  4. #24
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    46,360
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Air Pressure in Loaded tires.

    wow.. and to think all these years I've just looked at the tire on the ground and aired it up till it looked good and went about my work.

    no micrometer.. no tricorder.. no crystal ball.. and not nearly as much thought about it as going on here ???

    soundguy

  5. #25
    Super Member RickB's Avatar
    Join Date
    Sep 2000
    Posts
    7,038
    Location
    Eastern NY
    Tractor
    Case 885, JD 730D, Ford 4000

    Default Re: Air Pressure in Loaded tires.

    Quote Originally Posted by Soundguy View Post
    wow.. and to think all these years I've just looked at the tire on the ground and aired it up till it looked good and went about my work.

    no micrometer.. no tricorder.. no crystal ball.. and not nearly as much thought about it as going on here ???

    soundguy
    You & me, Sounder. You'd think our tires wouldn't last a week.
    We have too much gun control.
    What we need is more idiot control.

  6. #26
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    46,360
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Air Pressure in Loaded tires.

    After reading this thread, I'm expecting to go home and find all my tractor tires flat.. especially the loaded ones..

    soundguy

  7. #27
    New Member
    Join Date
    Feb 2005
    Posts
    11
    Location
    Virginia
    Tractor
    Kubota B3200 HSTw/R4s

    Default Re: Air Pressure in Loaded tires.

    Mace
    Thanks for reminding me to read posts closer, or at least when I'm not on the phone.
    2010 B3200 with FEL
    Farm Force Post hole digger
    60 inch landscape rake

  8. #28
    Super Member
    Join Date
    Feb 2006
    Posts
    7,682
    Location
    VA
    Tractor
    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: Air Pressure in Loaded tires.

    Quote Originally Posted by RickB View Post
    You & me, Sounder. You'd think our tires wouldn't last a week.
    Bet your valves last longer tho.
    larry
    This side of 40
    JD2010, Kubota L3450/FEL w SK QC, L2550 w FEL
    Mahindra 7520 [Pinky] /FEL w Skid Steer QC/w Tilt Tatch & BH, BX1500 [Mighty Mouse]
    IH37 Baler, CCM165 Drum Mower, JD Rake
    JD 127 bushog, Flail, SK Tilt Tatch , KK tiller, Rhino rear blade, Post driver, post auger, chipper, pallet fork, Grapple/Loader Buddy, Homemade Splitter/DC Welder

  9. #29
    Elite Member Don87's Avatar
    Join Date
    May 2010
    Posts
    4,226
    Location
    SW Pa.
    Tractor
    Massey Ferguson GC2400

    Default Re: Air Pressure in Loaded tires.

    Quote Originally Posted by Mace Canute View Post
    Movintgt, that's correct. Tire pressures need to vary with the weight they support. This is easily evident when you think of the front tires on a tractor with a FEL compared to the ones on a tractor with a 3PH mounted implement. What's correct for one is totally inappropriate for the other. It holds true for rear tires as well, of course.

    I posted this before in this thread, post#16 to be exact...

    "Tires are designed to operate at maximum efficiency when they are at their Rated Deflection. With the tractor on a hard surface, deflection is the distance from the axle center to the ground surface divided by the distance from the axle center to the top of the tire. In technical terms, deflection is the value of the loaded radius of the tire compared to the unloaded radius. Rated deflection is the amount of deflection when the tire is deformed to its optimum or design footprint. Rated deflection for radial tires is about 85%, for bias tires it is about 90%. The correct pressure to achieve rated deflection depends on the load the tire is carrying. A correctly inflated radial tire will have a significant sidewall bulge or "cheek'. It may look low or flat but it is not. If you inflate a radial tire by "eyeball" until the sidewall bulge looks like that of a bias ply tire, you lose most of the performance advantages of the radial tire."
    My point exactly.
    Don

    MF GC2400, FEL, 60in.MMM, 5ft. Cultivator, Single Bottom Plow, Bush Hog RTC48 tiller, MF 2360 front mount snowblower, 5ft backblade. BXpanded Piranha toothbar.

  10. #30
    Veteran Member
    Join Date
    Jul 2004
    Posts
    1,621
    Location
    Bancroft, Ontario
    Tractor
    JD4300

    Default Re: Air Pressure in Loaded tires.

    When I got my JD new, some kid(?) at the dealership had inflated the tires to the pressure rating on the sidewall. That lasted about 100yds when the seat switch kept shutting things down everytime I hit a bump.....Since then (4000hrs) they have been inflated to where they "look right", (except for a few times when they got flat on the bottom due to various foreign items.)

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