1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 184Get this manual
PRIMARY AND SECONDARY SHEAVES
PRIMARY AND SECONARY SHEAVES REMOVAL 1.Loosen: Nut (secondary sheave) D Nut (primary sheave) NOTE: Use the sheave holder to hold the primary shElave First, loosen the nut (secondary sheave)then loosen the nut (primary sheave) D
Sheave holder: PINYU-01880, 90890-01701