Belt, Fan (SN 4374- > ). PART NO: A-70562203. The Classical V-belt achieves power ratings considerably higher than most other belts available in the market. The compounds used to build up these belts are chosen to match the stipulated power ratings. Classical V-Belts offer distinct advantages towards increased safety on critical drives. . MODELS: Allis-Chalmers TRACTOR: 6060 (SN 3770- > ) Allis-Chalmers TRACTOR: 6070 Allis-Chalmers TRACTOR: 6080 (SN 4374- > ).