Check air pressure in a loaded tire???

The other posts are correct about the valve stem should be at the top of the rim when you check the pressure. And I would suggest that you use one of those "sliding" style gauges {used for large trucks} too.....

However, the other fine folks forgot to tell you to use the air chuck to shoot a quick burst of air into the tire (only takes a half-second of air) in order to blow any calcium chloride out of the valve stem. This will "clear" any fluid that is trapped in the valve stem, so that when you put the air gauge on the valvestem, the pressure does not blow the "C-C fluid" into the gauge!!!

We have fluid in all our tractor's rear tires and have used the same air gauge for well over 15 years without it corroding, which is caused by the salt-like properties of the fluid. We don't have to wash the gauge out or anything, because we clear the fluid out of the stem before checking the pressure!!!

BTW, On duals, we always try to put the outside dual wheels on the tractor with the valvestems aligned with the inside wheel valvestems. This saves having to move the tractor 4 times to get each valvestem on top-center.

I too have heard that you should not load the duals with fluid... yet these same people will load them with cast weights! I have run fluid in my duals for a few decades and have not had any adverse affect at all from it. I am still using the radial tires that we bought in the mid'80's and the lugs are fine (I don't do a lot of highway/roading of the tractors). They show weather/sun/age cracks, but no odd/abnormal wear! We run radials on all the larger equipment (those are the ones with duals). We usually load the inside tires to about 2/3rds full of fluid and the outside tires about 1/3rd to 1/2 full! One tractor {IH-1566} we also put about #300 of cast weights on each of the inside tires. That sucker has never run out of power!

As for "T-rails" and lugs... we have never had lug troubles at all. We have all our dual tires mounted on solid rims/hubs {M&W's} that bolt "directly" to the axle shafts. On our IH-1066, we started out {in '76} with bias-style tires mounted on hubless rims (bolted to the inside tire rims with long bolts). There was no fluid in them at that time (and no weights added). It was no time at all (only a few years) before we tore out the keyway and ruined the centers of the original inside hubs!!! I will never mount ANY dual-tire to the rim of the inside tire... ever! It is just too expensive in the long run! Those rear tires just have too much torque/leverage to be held out there that far with a single hub!