Garden Tractor clutch slips during pull
I pulled with my garden tractor and the first hook I pulled in 1st gear and had enough power but lost tire traction which I was glad about because everyone there said I’d never make it with an 8hp engine, pulled 92 feet. So the next hook I tried 2nd gear and made it a little farther about 105 feet but when the weight on the sled reached a certain point, tires stopped moving and tractor stopped dead in its tracks. I have reason to believe my clutch plates are slipping on the drive shaft. I had this issue during a practice pull and tightened the clutch spring to almost nothing between the spring when engaged to ensure enough tension. Is there anything I can add or do to get my traction on the clutch faces? Any help would be great!
It’s a bolens 853 model