Just recently experienced trouble ..I think with my clutch. When I engage my clutch to mow, the blade moves slowly and if I move the lever back and forth the blade engages and the rpms of the blade increases and I can cut my lawn, but it then suddenly stops and the rpms lower where it stops cutting. Is it my clutch? If so, are there repair kits sold or parts for this old case? I have attempted to adjust the belt tension but it doesn't help. Really love this old tractor but I really need it to work. Any help would be appreciated as cutting my large yard with a push mower is gonna send me to the ER..LOL