rear tire pressure???

Anonymous-0 · Apr 14, 2011

When I had the new tires put on my tractor, the guy asked an older guy in the shop how much to leave them at, guy said 21PSI (1.5 bar). The younger ones said 32psi (2.2 bar)
What should I be running to be best for the ground and tires on the road?

Thanks, Dave

Anonymous-0 · Apr 14, 2011

Have to look but it's prolly more than 32........I'll drop back to 20 tomorrow.

Dave

keh · Apr 14, 2011

Higher pressure for the road on the road will not have good traction on the ground. 15 psi is maximum for me. What does it say on the tire about maximum tire pressure?

KEH

RodinNS · Apr 14, 2011

It really depeends on what you're carrying in terms of weight. 32 would be about the maximum recomended so that would cover you for every situation and you'd always have enough. That said... if you're not using any heavy mounted impliments I suspect that closer 15 psi would be enough on a smaller, light tractor.
On the low end you risk destroying the tire from underinflation as well as wearing the tread off unevenly (towards the sidewalls). If you have too much air you risk wearing the center of the tread off fairly quickly as well as compromising traction.
Pick your poison. Everything is a compromise.

If you get right down to it the tire data book will give you a correct inflation pressure for a given amount of weight. If you know the approximate weight you're dealing with you can get fairly close.

Rod

rustred · Apr 14, 2011

it can be anywhere from 12-16 lbs. when i pull in the antique pulls i drop mine to 8 lbs. look at the tread contact on the ground and go from there. definitly will not be 32lbs. you will not want them hard like a rock and running on the centre.

Anonymous-0 · Apr 14, 2011

i sold tires years ago and most tires had a warning printed on the side wall that said not to excide 35 lbs for seating the bead rule of thumb for psi 1 pound per cross section in (ie) 15.5 tire 15 or 16 lbs 18.4= 18 lbs you go up or down depending weight and soil types

Dblair · Apr 14, 2011

Dave you better look at the Firestone chart. a lot
of tires won't hold 20 psi . the chart will tell you
the proper inflation rate at full load.

Pat-CT · Apr 14, 2011

Im thinking that 32+ you may see power hop, if the tractor has
enough power. Otherwise you may see excessive spinning

Pat-CT · Apr 14, 2011

I was trying to find a video of power hop for those that may not be familiar. heres an excellent video of it
http://www.youtube.com/watch?v=-tdObZ6jQoo

the tractor vet · Apr 14, 2011

Well myself on a little tractor even with fluid in them 12-15 . we just got done mounting two new condoms on the 1066 this evening and they are Firestone 18.4x38's Radials loaded to the max with fluid and for now we have them at 25 lbs. and as soon as they get set in good we will drop them back to 18-20lbs. Tomorrow we will put the tire back on my 806 with a new tube and load it also and i run 15 in it . Rusted Nuts says he run 8 lbs in his pulling tractor , will i tryed that on my S/MTA and it just rolls the lugs under and losses traction and i run 15 on it also and found that it does way better .

Anonymous-0 · Apr 14, 2011

Mostly in winter but a few times in summer, I have a container with between 3/4 and 1/2 ton of poop hanging, or 600+/- pound round bales on the 3PH. I'll drop to 20psi first and see hou it handles the load.

Thanks, Dave

Shetland Sheepdog · Apr 14, 2011

Forget PSI or Bar! Place tractor on hard flat surface, and inflate until lug shoulder just starts to lift off surface!
JMHO, HTH, Dave

David G · Apr 14, 2011

I have 15 PSI in my 15.9 x 38

sotxbill · Apr 14, 2011

higher for road use as you can run on the center and get better ground speed.. in the field you air them so the tread stays flat on the ground all the way across the width. this can be as low as 8 lbs on some tractors and as high as 18 on others pending on tire size and weight of tractor. I would never never never exceed 20 lbs on most tractors. I have a few weighted down at 18000 lbs that needed a lot of air.. but that was still below 30 lbs... and that was very few at that.. most run around 12 lbs.
Set the air pressure on hard ground or concrete so you can see when the tread tries to pick up and then back it off so the tread is perfectly flat.

Jim in Ma. · Apr 14, 2011

When I worked doing highway roadside mowing we ran about 40 lbs. in the rears to repell glass bottles. The fronts were filed and never go flat.
We ran 6 or 7 tractors at least 5 - 10hour days a week.

Anonymous-0 · Apr 15, 2011

Dave2 You didnot tell us the tire size. DO NOT put 32 lbs in them. I sold thousands of rear tractor tires and never put over 20 lbs in them. Most of the newer large radials are calling for 10 to 12 lbs max operating pressure.

Leroy · Apr 15, 2011

He has talked many a time on here about the size, it is the same as a N series Ford or TO-TE Ferguson, 11.2-12.4 X 28

Dick L · Apr 15, 2011

around 12 pounds on the light tractors around the farm. 15 on my 1850 and 1650 Olivers.
When chaseing the tractor pulls I pulled at an average of 8 pounds with my Allis C or B and around 10 with the Oliber 77, 66, and 88. Pulled around 8 pounds with my Farmall C also. 20 pounds or more will round the center of the tread and make the tire taller and run on the center of the tire tread. The more pressure the taller it gets in the center. Might work for some but it's not for me.

Anonymous-0 · Apr 15, 2011

(quoted from post at 19:13:44 04/14/11) Forget PSI or Bar! Place tractor on hard flat surface, and inflate until lug shoulder just starts to lift off surface!
JMHO, HTH, Dave

did that today, so, for folks like me that have to have a figure, 17 psi is the answer for a 11.2x28 tire on a 2700 pound tractor :roll:

thanks to everyone.

Dave

Aaron Ford · Apr 16, 2011

I use the business card trick which is similar to the lug lift method. I air up my tires on a concrete surface (garage) until i can fit a business card under the lug. I mainly do yard work and do not want to tear up the sod so a soft tire is a must. I do not carry much weight...

Aaron

rear tire pressure???

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