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Phil (WY) 
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Joined: 12 Sep 2009
Location: Cheyenne, WY
Points: 46
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 Topic: Tire air pressure
Posted: 17 Aug 2019 at 5:48pm |
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I have a D-14 with 14.9-26 tires on it. What's a good air pressure to run in them?
Thanks in advance.
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acd17toy
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Joined: 11 Sep 2009
Location: USA
Points: 706
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Posted: 17 Aug 2019 at 6:14pm |
The owners manual should tell how air pressure you need in the rear tires for any given load or condition.
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 24334
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Posted: 17 Aug 2019 at 6:18pm |
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12-15 ish... I was told to always have 3 ribs on the ground.
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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Dan Hauter
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Joined: 06 Feb 2011
Location: Carlinville, IL
Points: 1249
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Posted: 17 Aug 2019 at 6:22pm |
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If your tire pressure is too low you risk side wall cracking, especially with older tires. If the tire pressure is too high the tire will bounce while on the road, giving you a rough ride, and not put down much of a footprint when in the field, thus cutting down your traction. 18 pounds in the rears and 30 pounds in the front is a good place to start. As already noted, always check your owner's manual.
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200Tom1
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Joined: 03 Jun 2019
Location: Iowa
Points: 1232
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Posted: 17 Aug 2019 at 6:32pm |
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Phil. I spent 22 years in the farm tire business. I Put on many semi loads of farm rears. If I put those tires on your tractor I would have put 14 lbs in them. Do they have fluid in them? If so do you have a fluid gauge? You probably know all this, about the time your tractor was made, the people making inner tubes designed a new valve stem. The new style has male threads. The old style has female threads. If you have fluid in your tires, it is a good idea to figure out which style you have and keep a couple new ones around. It seems over the years calcium will destroy the valve cores and it can be a real pain to change the valve core. Most of the time it is easier to change the cote housing than the valve stem. They do make stainless steel valve cores to use with fluid. If the core is bad I guarentee it will leak when you check the air pressure. Sorry about the long post.
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Jim.ME
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Joined: 19 Nov 2016
Location: Maine
Points: 958
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Posted: 17 Aug 2019 at 6:52pm |
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I run 14 psi in my D14s with 14.9 - 26s. In this case the owners manual doesn't tell that size. When those manuals were printed the tire options are shown as 11.00 - 26 (12 psi) or 12.00 - 26 (14 psi), the old size designation system. According to Miller's site the 12.00 is now called 13.6.
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Phil (WY)
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Joined: 12 Sep 2009
Location: Cheyenne, WY
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Posted: 17 Aug 2019 at 6:59pm |
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Thank you everyone. I had 12# in them and one went flat. The tire shop I took it to to repair it put 20# in it and said that's what I should run. I don't have an owners manual so I wanted your expert advice. I haven't owned this long.
Thanks, Phil.
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Joe(TX)
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Joined: 11 Sep 2009
Location: Weatherford. TX
Points: 1682
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Posted: 17 Aug 2019 at 9:57pm |
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If you are not running weights you do not need the higher pressure. The owners manual has the tire pressure for the amount of weight carried. 20 lbs. will made a bumpy ride.
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1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A
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SteveM C/IL
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8467
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Posted: 17 Aug 2019 at 10:38pm |
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the sticker on the wheel center on dads WD says 12lb
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DSeries4
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Joined: 12 Sep 2009
Location: Ontario, Canada
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Posted: 18 Aug 2019 at 8:13pm |
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I never run more than 15 psi in any rear tires.
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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '61 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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TedBuiskerN.IL.
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Joined: 11 Sep 2009
Location: Davis, IL.
Points: 1959
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Posted: 20 Aug 2019 at 8:24pm |
12 psi in the rear, and 28 in the fronts is what the books call for. If you are running a heavy fully mounted piece of equipment they recommend adding 2 psi making it 14 psi.
Edited by TedBuiskerN.IL. - 20 Aug 2019 at 8:26pm
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Most problems can be solved with the proper application of high explosives.
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