traction problem

1. Adjust the height and length of you drawbar. 2. Move weight from the front to the back of the tractor.
3. Pull in a heaver class and put more weight on the back.

You want the front end to float on the ground. Use a front weight bracket that is 11 feet from the rear axle so you don't have to put as much weight on the front end to keep it down.

Do not use new tires for antique tractor pulling. Try to use old hard sharp cut tires that are a straighter angle. Example coop agra power/field and roads. Try to use a 4 ply tire and drop the air pressure down to 10 or 12 lbs. You can adjust your air pressure for the track you are pulling on. You may want to go to a 16.9 or 14.9 38 tire. They are both taller than a 15.5 38. You will get a faster ground speed. I am not a fan of using the 15.5 38’s for pulling, but I know one guy that makes them work on a Moline.

1. Both sets of tires you used may be too big for 5000! The can sit on the top and spin out. A 13.6 38 for 5000 lbs class would be a good tire on a hard pulling track. The guys I know that uses the 15.5 38's pulls in the 6500 and 7500 lbs. I pulled in 3500 through 5500 lbs class with a WC Allis with 12.4 28 rear tires and placed consistently for many years on hard pulling tracks. (It had 50HP) I tried 18.4 26 and spun out every time.

2. Increase engine RPM's, pull in a higher gear, or use taller tires to get a faster ground speed if the rules allow.