Is it common to completely fill a tire with ballast?

2busy2work

New member

Equipment
L2501
May 11, 2026
4
0
1
Jackson, Georgia
Apparently, the rear tires on my tractor were completely filled with ballast when I bought it. This is how I found out.

I am new to liquid filled tractor tires. I recently bought a 2023 L2501 HST and loader with only 200 hours on it. I was using it for the first time this past weekend to plow food plots when the left rear tire slid back off the rim enough to lose all the liquid ballast. I was driving the tractor in medium gear to the next plot when this happened.

Apparently the pressure in the tire was not adequate to hold the tire to the rim. Getting it back on the rim is a long story but I did manage to air fill it and get the tractor back home. The liquid that came out appeared to be water. It was clear and not salty. I confirmed the tire had only water in it by calling the dealer in South Georgia who sold it new 3 years ago. They never have a hard freeze, So, I decided to refill the tire with water and address any freezing concern later if the weather here in Middle Georgia requires it.

To get started, I jacked up both tires on level concrete. Then I checked the air pressure in the right side rear tire to see if it was also about to spring a leak. With the valve at 12 o'clock, it barely registered any pressure and kept squirting water out when the valve was opened. (I used a good dial type pressure gauge.) Since I have recently learned to only fill them to 75% full, I decided that it must have been slightly over-filled. I started draining what I assumed would be a little extra water by pushing the valve center. All I got was more water.

20260829_142912 (Medium).jpg

30 minutes later, I just removed the valve center and let water squirt out for 15 more minutes and then drip out for another 15 minutes.

20260829_144039 (Medium).jpg

20260829_144651 (Medium).jpg

I did not measure the water removed but it was enough in my opinion to have completely filled the tire. I turned the tire a little to verify it was now only 75% filled and aired it up to 20 psi. per the operator's manual.

Then I filled the left tire to 75% level and 20 psi. using the adapter fitted to my water hose.

20260829_150740 (Medium).jpg I

My research on this forum and other AI data indicated that completely filling tires is not a good idea due to no room for compression. The previous owner said the tires came with water in them when he bought the tractor new. I have to assume the dealer added all the water in them.

Is this common? Should I stay at 75% filled? I have never had ballast filled tires. I feel lucky it was only water which was easy to replace.
 

NCL4701

Well-known member

Equipment
L4701, T2290, WC68, grapple, BB1572, Farmi W50R, Howes 500, 16kW IMD gen, WG24
Apr 27, 2020
3,630
6,750
113
Central Piedmont, NC
Valve at 12 o’clock, fluid below valve and air above is max fill. The tire needs the air pocket to flex.

100% fluid is wrong.
 
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lynnmor

Well-known member

Equipment
B2601-1
May 3, 2021
1,807
1,612
113
Red Lion
I think that you understand things quite well. The only thing I would add is to put in some kind of rust preventive.
 

2busy2work

New member

Equipment
L2501
May 11, 2026
4
0
1
Jackson, Georgia
Thanks for the tip on rust prevention. I will look into that.

I told my neighbor about it since he has a 15 year old Kubota. He confirmed his only had about 10 psi in them and the fluid that came out was brown. Maybe that is rust? He said he had never checked the tire pressure and never had a problem. We both agreed we need to start checking our air pressure often.

I will tell him about the rust prevention too.

Thanks guys!
 

BAP

Well-known member
Lifetime Member

Equipment
2012 Kubota 2920, 60MMM, FEL, BH65 48" Bush Hog, 60"Backblade, B2782B Snowblower
Dec 31, 2012
3,182
1,300
113
New Hampshire
Thanks for the tip on rust prevention. I will look into that.

I told my neighbor about it since he has a 15 year old Kubota. He confirmed his only had about 10 psi in them and the fluid that came out was brown. Maybe that is rust? He said he had never checked the tire pressure and never had a problem. We both agreed we need to start checking our air pressure often.

I will tell him about the rust prevention too.

Thanks guys!
The brown may mean that he has a different kind of ballast in there like Beet Juice.
 

JasonW

Well-known member
Jan 29, 2015
867
583
93
Al
It’s almost impossible to fill it completely with ballast as they filled it just as you did.
Also at 20psi those are probably as hard as a rock. I would at least drop down to 10-12 on the rears, if not even lower.
 

2busy2work

New member

Equipment
L2501
May 11, 2026
4
0
1
Jackson, Georgia
That tire sure let out a lot of water to get down to the recommended fill level. Maybe they laid it on its side to fill it? But now it is filled properly...I hope.

I agree that the rear tires are much harder than before. They have a distinct arch on top. I will reduce the air pressure to 12 psi as you suggested. I just want to be sure they stay mounted and do not leak.

Thanks.