Posted by JD Seller on April 07, 2013 at 20:27:19 from (208.126.196.144):
In Reply to: Rear tire pressure. posted by jon f mn on April 07, 2013 at 08:17:26:
On our JD 4960 we run 8-10 PSI on the rears when pulling the finisher in the spring. They are Firestone 20.8 x 42 radials. This pressure is within the design for weight and load. It really makes a difference in the surface compaction.
When I originally weighted this tractor we took it to the local grain elevator and weight the front and back axles. Then the total tractor. Then I played with front and rear wheel weights to get where is should be.
Here is how the numbers turned out. I wanted 115 lbs. per horse power for total weight. So 200 x 115 = 23000. Then I wanted the final weight to be 60% rear and 40% front. So that worked out to be 13800 lbs on the rear and then 9200 lbs on the fronts. Then I looked up the rated weight carrying capacity at 6-8 MPH on the rear tires. This is divided by four when we run the duals and two when we are not. That worked out to be 8 PSI with the duals and 18 PSI without.
The fronts tires at full ballast weight require 20 PSI. When we remove the duals we also remove most of the front weights. We then run the front tires at 15 PSI. It makes the tractor ride much better. I am considering front duals for tillage but at $6500 for them I am not jumping right now. We have been thinking about getting a full 4wd for heavy tillage.
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