Correct tire pressure (newb question)

[pschrad]

Newb question here.

I have a JD 870 tractor that currently has turf tires mounted on it. Winter is coming and I am going to mount the Firestone Ag ties that came with it.

Could you suggest what the correct tire pressure should be for the rear Ag tires?

Firestone All Traction Field & Road
`12.4 x 24

Thanks

 

[RaydaKub]

Won't they have the pressure range stamped on the sidewall?

 

[mddorange]

:welcome:
To the TBN forum pschrad. I found this: Max Load and Inflation: 1870 lbs at 16 psi, on the Firestone website.

 

[JimRB]

Owners manual says 12-16 psi for that tire size.

 

[pschrad]

Most helpful..Thanks,Jim

-Paul

 

[oosik]

Hi pschrad,
I'm about 17 miles NW of you and hoping some of this rain may soon become snow also. Have a good day. Oosik

 

[thatguy]

Just a reminder - if you have 4x4, you need will want to make sure that the Ag rear tires are in proportion to the front tires (assuming you dont have Ag fronts as well)

On my 2320 R-4 tires - i put in 16# of air and that thing bounced like a kids ball.. I had to lower it to around 12# so it didnt jar my insides out..

brian

 

[pat32rf]

I'm with that guy. When the dealer delivered my tractor i kept bouncing enough to shut the engine off with the seat safety switch.
I lowered the pressure so i had full width contact on pavement and found that worked great as my MAXIMUM pressure. For roots and rocks you can get by with even less....
Tires are designed to flex, you don't need to worry about heat build up like in a car...

 

[pschrad]

Thanks pat32rf and thatguy for your tips.......................most helpful.

Can't wait until we get some snow.

-Paul

 

[Midniteoyl]

http://commercial.firestone.com/con...bles/Mar2015/Load and Inflation - Table E.pdf

 

[pat32rf]

Don't recall my tire size but they are almost full of wwaf and have less than 14psi in them. The front have closer to 35psi...

 

[Egon]

Pressure depends on type of rating and what's printed on the sidewall.

 

[Midniteoyl]

Pressure depends on type of rating and what's printed on the sidewall.

Not really.. Its max load, including weight of the tractor, that you expect. There are charts for weight/load vs psi vs speed (that you are using the tire at). Rarely do you use the max on the sidewall for normal use.

Same goes for your car and truck tires..

 

[Egon]

Not really.. Its max load, including weight of the tractor, that you expect. There are charts for weight/load vs psi vs speed (that you are using the tire at). Rarely do you use the max on the sidewall for normal use.

Same goes for your car and truck tires..

One can always tell what the weight of load will be ?? Speed rating may be governed by vehicle type.

All mine are at max.

 

[buickanddeere]

Tire manufactures have charts online with consideration to size, plys, weight , speed and side hill applications .

 

[Kubota 2350]

Thanks pat32rf and thatguy for your tips.......................most helpful.

Can't wait until we get some snow.

-Paul

Your more than welcome to any I get at my place.

 

[Texasmark]

I run mine as soft as the load will allow with some sidewall flexing with the heaviest load. My back is more important to me than any tire that might fail from under inflation on the farm. My Silverado runs at the recommended 35 because I'm running 20" tires and they don't have the sidewall that can flex that a normal 78 type tire has. Seems the suspension is tuned for that pressure as the ride is smooth as silk as is the comfort of the seats........Fisher body at it's best.

 

[buickanddeere]

One can always tell what the weight of load will be ?? Speed rating may be governed by vehicle type.

All mine are at max.

Increases tread wear in the center, lengthens stopping distance.

 

[John_Mc]

One can always tell what the weight of load will be ?? Speed rating may be governed by vehicle type.

All mine are at max.

Are you talking the max of the tractor manufacturer's recommended range, or the max stamped on the tire? The latter will generally give you poorer traction, poorer ride, and quicker wear on the center of your tread. It might give you better gas mileage, if you were running on pavement, but that's usually not the primary concern for running a tractor.

 

[Egon]

Increases tread wear in the center, lengthens stopping distance.

Haven't noticed any excess center wear. All wear flat.