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tire pressures

R

rkc9700

Member
just put new 18.4 -38 bias tires on my tw5 ford , used mainly for haying and feeding . what tire pressure should I run ? also its MFWD bias in front , pressure there too please.
 
I have a little john Deere 2555 MFWD I just aired them up 14 psi in the back and 12 psi in the front. I'm sure some one will post the correct answer.
 
What my local tire shop manager told me: for tractor drive tires (bias ONLY - does not apply to radials) you just take the first two digits of the size (18 in this case) and add two. 20 psi in the rears. If the fronts are 14.9x28's, put 16 psi in them.
 
Drive tractor on flat ground like a concrete drive and see if the whole tread surface is contacting the ground. If its only contacting the center/middle section of tread start dropping air pressure until most of the tread surface is making contact. You basically want just enough air in the tires to start lifting the outer edge of the tread lugs off the ground If tractor spends most of its time with an attachment or load then do the tread test while equipped.
 
(quoted from post at 22:51:44 10/28/14) What my local tire shop manager told me: for tractor drive tires (bias ONLY - does not apply to radials) you just take the first two digits of the size (18 in this case) and add two. 20 psi in the rears. If the fronts are 14.9x28's, put 16 psi in them.
Click to expand...

I see no relation between tire width and pressure. I've never heard width + 2#s before. Rear tire pressure depends a lot on what's attached on the rear of tractor.
 
I agree with that. First of all my Triton have the max air pressure posted on the tire sidewall. For my 16.9x28s it's 18 PSI and they are only 6 ply. I run 15-18 in them.

My fronts are 20x18 or something like that and are 10 ply luggers with a rating of 45. Even though I have a FEL I only run 18 in them because of the short wheel base and all it makes for a softer ride. Yes they pooch when I have a load and if I am going to do any loader work to speak of I'll run them up to 30 then back when finished.

On my Fords I run 30 in the fronts 600-16 4 ply primarily as an aid to manual steering and 18 in the rear 13.whatever x 24 4 ply for softness of the ride. Seldom do I have much weight on them and when I do the tires squat.

But I agree on the flat tread test mentioned too. Just have to make a decision on what you are going to do when you change loads.

My 2c
Mark
 

due to differences in weight, there is NO correct answer except to air it for the loads your tractor will be carrying.

Most folks over air the tires, resulting a v shaped and no traction. This is hard on the carcuss and can break it down... some under air and its hard on the sidewalls.

As said,, tires should be flat on ground for the weight your carrying. If you change your plows and work, you may need to change your air pressure slightly. Pressure could be from 8 lbs to 20 lbs. Usually 8 to 12 lbs unless your really weighted down. Larger tractors seem to need to run higher due to the weights they are carrying, small tractors are very seldom weighted.
 
manufactures web site lists tire size, plys, speed etc and the proper pressure . What ask Bubba instead of the engineers that designed the tire?
 
One reason is that they give you the carrying capacity and the
max pressure, obviously the stated max pressure was for the
stated max load. If you run your tires at that pressure with light
loads, belted or not they wear in the center before the sides.

I have a baby sitter in each tire (came with the truck) and if you
don't keep them aired fully the baby sitter gets in your face.

So my tires are wearing out in the center. On my farm tires I
keep them as low as is reasonable to reduce the rough ride.
Been about 40 years. Maybe one day I'll have a failure.

Mark
 
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