Tires Tire pressure in 3x20... WOW....

[nmu98]

I loaned my 3720 cab to my uncle who is a farmer. We often trade tractor if needed.

So he was checking things over before he used the tractor and thought the rear tires were were soft. I keep them at 11-12 pounds. He put them up to 20... WOW... I felt like I was bouncing side to side. I really got the tippy feeling many people here have talked about and lost traction. So, I dropped the pressure back down, and the tractor feels stable again.... Anyone else found that running higher pressure in the rears causes the tractor to bounce side to side more?

How much air are you guys running?

 

[L-ENTERPRISES]

I loaned my 3720 cab to my uncle who is a farmer. We often trade tractor if needed.

So he was checking things over before he used the tractor and thought the rear tires were were soft. I keep them at 11-12 pounds. He put them up to 20... WOW... I felt like I was bouncing side to side. I really got the tippy feeling many people here have talked about and lost traction. So, I dropped the pressure back down, and the tractor feels stable again.... Anyone else found that running higher pressure in the rears causes the tractor to bounce side to side more?

How much air are you guys running?

About 12 pounds ..

Brian ?

 

[greenmule]

19 rears,29 fronts,rears loaded,ck30 with industrial titan tires.

 

[GreenMtns]

According to my owners manual, 12 pounds front and rear, for the size R4's I am running.

 

[jenkinsph]

I would think you are correct with 12 lbs in the rear tires when filled. Since you can't compress the liquid the pressure should be less.



Steve

 

[nmu98]

I would think you are correct with 12 lbs in the rear tires when filled. Since you can't compress the liquid the pressure should be less.



Steve

I am not running filled tires.

 

[MessickFarmEqu]

pressure for liquid filled tires does not change. You still need the same pressure in the air pocket at the top of the tire.

 

[greenmule]

Titan recommends not going below 20 psi on those industrial tires I have on my ck 30,asked them and they responded by e-mail. [might come loose from rim,break loose,unseal,etc]. If you got a fel on front,you probably oughta run 40 psi or more in front tire[same reason].

It all depends on tire and load,do a search,there was a very good thing out of deeres owners manual [or something from deere],posted on deere forum couple months ago when I raised this question on kioti forum,it lists tire/tire sizes and load they are rated at at certain psi.

And yeah filled or unfilled,psi of the air is same.When you fill them,you don't fill them all the way,you leave air pocket in top.

 

[jenkinsph]

I think you guys are right in normal use a tire filled to 3/4 full should have an air pocket large enough to provide a good cushion for the tire. My concern is (right or wrong) climbing over a small rock stump or log where the tire needs to deflect more to keep from bruising the tire. If the air space is reduced by 75% (by filling with liquid) you will have less deflection. Is this a moot point?



Steve

 

[BigE_]

My NH manual has different tire pressures for filled vs. non-filled tires. I don't have it in front of me, but I believe the filled tires requires less pressure.