Tires 1845 Bar tread Tire Pressure?

[Charlie_Iliff]

After some years on turfs, I put on bar treads. Any suggestions for tire pressures? Pending learned advice I put it at 12 all around.

 

[J_J]

Charlie

On my 1445, which weighs about 3900 lbs, Someone had written 21 lbs on the rims, and it seems to work for me. My tires are 26x12x12.

 

[J_J]

Charlie

I went to the Titan web site, and the recommend tire pressure for 26x12x12, is 20 lbs for 4 ply, and 30 lbs for 6 ply, 42 lbs for 8 ply, and 52 lbs for 10 ply

 

[FOURTEEN]

I experimented to find the best pressures for my PT-425, and that procedure should work for you:

Drive the tractor onto a clean concrete floor with its normal attachment on and raised .
Move back or forth until the outside edge of one bar is contacting the floor.
With high pressure in the Front tire, the outer edge of the bar will be lifted so that a sheet of thin paper can be slid under it.
Reduce the tire pressure until the paper can no longer be slid under the bar.
Repeat for the Rear tire.

This should be fine for the Rear tire because as you load the tractor, weight on the rear will be reduced.

Check the Front tire by lifting something very heavy. Insure that with that weight on it the Front tire still has clearance from the rim. About 1/2 compression is ok.
Drive over a wet newspaper. The tracks left on the dry floor should show a nice full width tread pattern.

These pressures will provide the best traction, comfort, safety, and wear! /forums/images/graemlins/cool.gif

 

[Charlie_Iliff]

Thanks JJ
Mine are Carlisle Super Lug 26-12-12, 4 ply, and my 1845 is probably 600 lb. lighter than your 1445. Fourteen's post may shame me into a systematic approach instead of just aksing on TBN. /forums/images/graemlins/tongue.gif

 

[MossRoad]

/forums/images/graemlins/grin.gif /forums/images/graemlins/smile.gif /forums/images/graemlins/laugh.gif /forums/images/graemlins/tongue.gif!!!

 

[Charlie_Iliff]

Fourteen:
That's altogether too logical and systematic. I'll need help, so no doubt I'll have to get Bubenberg for
<font color="red"> Check the Front tire by lifting something very heavy. Insure that with that weight on it the Front tire still has clearance from the rim. </font>
ADD WEIGHT
/forums/images/graemlins/grin.gif

 

[JackIL]

J J and Others,

Just a point of clarification about using information from the Load-Inflation Pressure tables from tire manufactureres or from the Tire and Rim Association. When only one inflation pressure is given for a given ply rating, that is the MAXIMUM pressure allowed. It doesn't mean that is the recommended or required pressure. The required pressure is based on the maximum weight carried by the tire. With the notable exception of the front tires on loader tractors, most tires on compact tractors have much more load carrying capacity than is actually being used so the pressures do not have to be set at the maximum. The higher the inflation pressure, the more pressure is exerted on the soil and hence more compaction can be induced.

The average contact pressure on the surface is only a little higher (1-2 psi at most) than the inflation pressure in any tire. Note that the word AVERAGE is important here. Under lugs the pressure will be much higher, and in between, it will be much lower. The average is based on the entire oval area where the rubber covers the soil.

When inflated properly and carrying the weight of the loaded vehicle, the lugs touching the ground should make contact with a paved surface all the way out to the shoulders. This is a quick way to visually check if the inflation pressure is approximately correct. Of course if the vehicle is unloaded the contact area and lug contact will decrease.

The most accurate way to set inflation pressure is to use the Load-Inflation Tables for the tire size and ply rating (load rating for radials.) This requires knowing the weight being carried by each tire. For all practical purposes this can be done by weighing on platform scales. Using the actual load on a tire, you then consult the tables to determine the required inflation pressure for that load.

So for the specific tires in question, 26x12-12, the Load-Inflation Pressure tables indicate that for 2 ply tires the maximum load per tire is 1185 pounds and requires 10 psi; for 4 ply tires, the maximum load per tire is 1780 pounds and requires 20 psi. Even with the loader bucket full, the front tires (assuming 4 ply) on a 3900 pound PT should not require 20 psi. You need to weigh the front axle with the bucket full. Then divide by 2 if 2 front tires or 4 if with duals to determine the load per tire.

Maybe this is more than you wanted to know. Hope you weren't bored with the details.

JackIL

 

[FOURTEEN]

"" Maybe this is more than you wanted to know. ""

Thanks!! Your procedure makes my procedure seem childishly simple and easy rather than "altogether too logical and systematic"!!!! /forums/images/graemlins/grin.gif

With a vehicle such as an older ATV or a Power Trac where the tires provide the only suspension, correct tire pressure is critical! Too soft can result in damage to the tires or wheels. Too hard can result in an uncomfortable ride, poor traction and handling, and the bending, breaking, or accelerated wear of the vehicle's other driveline components! /forums/images/graemlins/frown.gif /forums/images/graemlins/blush.gif

PS: The Carlisle Super Lug tires on my PT-425 do an excellent job under all conditions. On very soft ground they even provide a lovely decorative herringbone pattern on an otherwise plain flat surface!!

Note how the wide track allows the reversed wheels to safely and conveniently straddle the ditch!!