Henro
Elite Member
- Joined
- Jul 4, 2003
- Messages
- 4,948
- Location
- Few miles north of Pgh, PA
- Tractor
- Kubota B2910, BX2200, KX41-2V mini EX
Gamemaster,
Everything I have read regarding liquid fill in tires said for maximum level to have the valve stem at 12 O'clock and fill to the level of the valve stem, and no more.
When I filled my rear tires, I put the valve at 12 O'clock and lifted the back of the tractor so the tires were just off the ground, and pumped the liquid in.
I had to stop several times to release air pressure, as the liquid going into the tire displaced air, and the air pressure in the tire increased as the result.
The final step was to let tire pressure go down to zero at the finish. At this time the tire was over filled with fluid, and the fluid was blown out before the air finally started coming out.
When I saw (I used clear plastic hose) that it was all air, with just a bubble of fluid now and then coming out the fill hose, I knew the liquid level was at the prescribed fill level of the valve stem with it was at 12 O'clock.
Here is one caution. Some rims do not have a lip on the inside to hold the tire on if air pressure goes to zero. If you want to lift the tractor wheel off the ground and see if liquid will come out of the valve stem, when it is at 12 O'clock, you may want to be careful, and if necessary, stop and put air pressure back in the tire, then continue to drain fluid out in a drain, repressurize, drain sequence if needed.
As far as when to check tire pressure. I know that some members with far more experience than I have recommend lifting the tractor off the ground before checking pressure in loaded tires. It is hard for me to understand what would be gained in the long run by doing this. I don't do it. I don't see the need myself.
Here is the reason. I prefer to look at my tires, or feel the way they ride and adjust tire pressure accordingly. Now if someone told me I had to fill my tires to a certain pressure, and that pressure was what would be in the tire when the tire was not supporting the tractor, I would have no option but to lift the tire off the ground before measuring what pressure was in it.
But since no one is telling me what my tire pressure has to be, I choose to determine what the pressure in the tire should measure when the tire is on the ground. I think I run about 12 psi normall, but I can tell you last spring, the tires looked a little soft, and measured 4 psi! /forums/images/graemlins/blush.gif Guess I had not checked them for a while! /forums/images/graemlins/blush.gif /forums/images/graemlins/blush.gif /forums/images/graemlins/blush.gif
Now I would be willing to be that once tire pressure is set to some value when the tire is off the ground, that after the tractor was set back on the ground, if the pressure was measured again (probably a little higher now) and recorded, that it would no longer be necessary to check air pressure with the tractor in the air. Simply setting pressure to the higher recorded value would put the "in the air pressure" pretty much dead on.
Boy, that's a lot of words to say, my guess is that your guess is correct. I would as I mentioned above, not let the tire pressure drop to zero though, just incase you have one of those rims that the tire can fall off of. That would make a simple job a real pain, as someone here has posted previously...(Forget who, glad it wasn't me...)
Everything I have read regarding liquid fill in tires said for maximum level to have the valve stem at 12 O'clock and fill to the level of the valve stem, and no more.
When I filled my rear tires, I put the valve at 12 O'clock and lifted the back of the tractor so the tires were just off the ground, and pumped the liquid in.
I had to stop several times to release air pressure, as the liquid going into the tire displaced air, and the air pressure in the tire increased as the result.
The final step was to let tire pressure go down to zero at the finish. At this time the tire was over filled with fluid, and the fluid was blown out before the air finally started coming out.
When I saw (I used clear plastic hose) that it was all air, with just a bubble of fluid now and then coming out the fill hose, I knew the liquid level was at the prescribed fill level of the valve stem with it was at 12 O'clock.
Here is one caution. Some rims do not have a lip on the inside to hold the tire on if air pressure goes to zero. If you want to lift the tractor wheel off the ground and see if liquid will come out of the valve stem, when it is at 12 O'clock, you may want to be careful, and if necessary, stop and put air pressure back in the tire, then continue to drain fluid out in a drain, repressurize, drain sequence if needed.
As far as when to check tire pressure. I know that some members with far more experience than I have recommend lifting the tractor off the ground before checking pressure in loaded tires. It is hard for me to understand what would be gained in the long run by doing this. I don't do it. I don't see the need myself.
Here is the reason. I prefer to look at my tires, or feel the way they ride and adjust tire pressure accordingly. Now if someone told me I had to fill my tires to a certain pressure, and that pressure was what would be in the tire when the tire was not supporting the tractor, I would have no option but to lift the tire off the ground before measuring what pressure was in it.
But since no one is telling me what my tire pressure has to be, I choose to determine what the pressure in the tire should measure when the tire is on the ground. I think I run about 12 psi normall, but I can tell you last spring, the tires looked a little soft, and measured 4 psi! /forums/images/graemlins/blush.gif Guess I had not checked them for a while! /forums/images/graemlins/blush.gif /forums/images/graemlins/blush.gif /forums/images/graemlins/blush.gif
Now I would be willing to be that once tire pressure is set to some value when the tire is off the ground, that after the tractor was set back on the ground, if the pressure was measured again (probably a little higher now) and recorded, that it would no longer be necessary to check air pressure with the tractor in the air. Simply setting pressure to the higher recorded value would put the "in the air pressure" pretty much dead on.
Boy, that's a lot of words to say, my guess is that your guess is correct. I would as I mentioned above, not let the tire pressure drop to zero though, just incase you have one of those rims that the tire can fall off of. That would make a simple job a real pain, as someone here has posted previously...(Forget who, glad it wasn't me...)