Tires Tire Pressue

[Phred]

Guys,

My TN70 came with ags and the origional tire pressure was about 32 psi!
Sorry I can't remeber the size but they are the standard Ag tires that come with the 4wd TN series ~14X30? These are not liquid filled. They are goodyear titans.

The manual says to run them at ~18 psi. On the side of the tire it says not to excheed 36 psi max. So it sounds like the origional 32 psi was very high.

The dealer says that the 18 psi in the manual means for tires that are liquid filled and that a non liquid filled tire needs to run about 32 psi.

My observation is that at 32 psi the ride is a bit rough to say the lest; but thats ok its a tractor not a car. At 18 psi the tractor is not nearly as stable and the tires tend to roll a bit to the side; they give a little under load. Dealer says thats the problem with the 18 psi.

What do you guys run/think?

Fred

 

[jinman]

Fred, why not split the difference and go with about 24 psi? I'd think the maximum pressure you put in your tires would relate to the weight of implements you normally use on the 3PH. Certainly lower pressure will give you more ground contact unless it's too low where the middle will easily curve upwards. If you are not running on pavement or concrete, tire wear should not be a problem. I think I'd run the pressure that I was most comfortable with as long as I didn't exceed the maximum. ...my two cents.

 

[billfires]

Phred, the manual states that the max. pressure for the front tires of my 1920 is 20 psi. With a full bucket of material the tires would squat badly. An e mail to Firestone stated the max. pressure was 30 psi. The difference was unbelievable, no more feeling like the tires were going to roll off the rims.

Billfires

 

[Phred]

Guys,

I also found that at low tire pressure the tractor is not very stable. With a full bucket and the ~1000lb rear blade on the 3pt I am uncomfortable. The tractor seems to lean a bit more then I like.

I actually liked the higher tire pressure from the stand point of performnace. The only concern I had was that I sure don't want to blow one of these up by over inflating it and then working it hard on a very hot day. The 36 psi appears to be the max for setting the tire during install. I would think the actually operating pressure should be lower.
I will follow your idea and contact the tire manufacturer about their recommendation.

It seems strange that new holland would put such a low figure in the manual. I will check again but I don't recall any statment about it being for liquid filled tires.

Fred

 

[Phred]

Guys,

Just in case anyone faces this problem I thought I would report back with what I found.

The tires that I have are Titan Hi-traction Bias Lug R-1s.
The fronts are 11.2-24 and the rear is 16.9-30.
The rears are 6 ply and I bieleve the fronts are 4 ply (but I need to check this again). They are all tubless.

For the 16.9-30 6-ply the manufacture does in deed spec 18 psi as the max operating pressure. An 8 ply 16.9-30 would have a max operating pressure of 24 psi. None would be designed for 30 psi, which is what the dealer had them set to!
The 11.2x24 s have a max operating pressure of 18 psi, 24 psi, and 36 psi for 4, 6, and 8 ply ratings.

Higher tire pressure can result in tire damage since the tire does not give. So if you hit a sharp rock in theory the tire may not give enough and the tire can be physically damaged.
My understanding is that the tire is not going to blow up their simply exists the possibility that it would be ruined.

Some safety margins exsit on these specs and the whole tractor does not feel stable with 18 psi in the rears. To much leaning on hills. So I will run with 24 psi in the rears and fronts. The guy from titian said that this is fine in a round about way, since he did not want to get in trouble in regard to the company line. A slight risk exists in tire failure, however, most of my work is at low speed (>6 mph)- bushhog, rear blade, etc... Also once I ware these out I will be replacing them with 8 ply on the rears and 6 ply on the fronts. Hope this is a long time from now because these suckers are expensive.

The detail tire specs can be found at:
<A target="_blank" HREF=http://www.titanstore.com/store/index_page.html>http://www.titanstore.com/store/index_page.html</A>

Also if you use the tire at speeds less than 10 mph then you can add 11% to the load rating. Less than 5 mph then you can add 22%.

Fred

 

[Mosey]

Maybe the old inline 6 cylinder engine firing order rule applies here to:

15 is too young
36 is too old
24 is just right!

1-5-3-6-2-4

 

[wihakowiSteve]

Good thread I guess, but I really don't know if there was any consensus reached! My NH mechanic said to go ahead and goose them up a little higher than lower!

I do have a question/warning to throw out there -- while we were discussing tire pressures, the same mechanic asked how I measured the pressure. I told him with a tire gauge, of course, and he responded that I may as well throw it away after testing the pressures! He said the calcium loading material would eat out the gauge rather quickly, making it unusable. He said that it "might" not be such a problem if I measured with the valve stem at 12 oclock but that he still wouldn't trust the gauge afterwards. Like the dummy I sometimes am, I neglected to ask what they use at the shop after they fill them!
Any thoughts on this situation/dilemna?? If it's true, what do the shops use (I suppose I could sacrifice a cheap gauge every time I checked pressure but I don't trust cheap gauges in the first place!)? Steve

 

[Hoeman00]

There are gauges made that can handle Calcium.
One cheap way is to use the regulator and turn it down to the pressure
u want then put on tire and listen for air going into tire.
U will have to watch is that pressure in hose is more than tire
or u will get calcium into hose then back to compressor tank.
If u get calcium in hose take it off and run water thru it
and rinse off tire inflater, u can take the inflater apart (unscrew collar) to
help clean it.
A seperate hose would be good idea w/ inflater hooked on direct.
Spray w/ wd-40 or Blaster has a good air tool oil.

 

[John_Mc]

There are guages made specifically for liquid filled tires. Calcium Chloride will corrode most of them if you don't rinse them out afterward. If you do rinse, they'll hold up fairly well.

On my guage, the pressure plunger is spring-loaded. Once you take it off the tire, it retracts back into the barrel, pushing out any air or liquid. To rinse it, just hold it under water, pull the plunger out and let it spring back. repeat a few times. This generally does a decent job of rinsing out the CaCl

John Mc

 

[Phred]

Guys,

I checked the front tires and they are 6 ply. So 24 psi is the correct pressure for the fronts.

Also I did not make it clear. On the rears that 36 psi is a maximum for the installer (it clearly says so on the tire), and not maximum operating pressure.

Fred