Airing down tires

[RoyJackson]

I assume those rear tires aren't filled with liquid?

The intent of lowering pressure is to get more tire patch on the ground. More tire patch means less weight per square inch of patch...also means more surface area (of the tire patch) for traction.
It can't hurt to try this and see how it works...like other's wrote, remove the loader first and make sure you increase pressure before you re-install the loader.
Also...don't go overboard on reducing the pressure. You could break the bead if the tires slip on the rims.
My suggestion is to wait until that ground dries up before you mow.

BTW, lowering tire pressure also works well to increase traction in snowy conditions...and not just for tractors. If you do this with a road vehicle, just be advised lower pressures increase heat...not a problem with a low speed tractor, but can definitely be a problem with a road vehicle.

 

[Mark Page]

I used to fish the surf on Maryland's coastal beaches. 15 psi used to work well. Always reinflated when I got back on the road. Some guys went down to 10 psi but that always seemed a little risky.

 

[MHarryE]

Not sure what size tires your tractor has. My Kubota L5740 with loader and rear wheel weights weighs 6900 pounds. The rear tires are 17.5L-24s 6 ply rating. At 20 psi the load rating per tire is 4400 pounds. My fronts are 10-16.5 with load rating 3500 pounds at 45 psi. My manual says to run at the maximum inflation pressure so I have 15,800 pounds of load capacity. The Tire and Rim Association lists that as the minimum inflation pressure for the R-4 tire but for a 17.5L x 24 ag tire (I haven't seen that size in anything but R-4) the T&R Assn says it can go down to 12 psi and will then have a 2500 pound capacity per tire. It looks like you should not have a problem dropping to 12 psi as long as you don't exceed 5,000 pounds on the rear axle, but the book has a caveat for that. The load limit can be exceeded by 33% if you don't exceed 10 mph and 22% if you don't exceed 15 mph. My understanding is the tractor companies use the maximum because they have no control over the implement you hang on back or how much you put in the bucket of your loader - up to hydraulic capacity.

 

[Dougw133]

I checked my pressure and they are at 35psi. Max per the tire is 44psi. I removed the loader and mowed my field. Small ruts but no damage to soil or grass. No, they are not filled