Just had to do this job myself on a Vision 330 I found in the street ..put out for the dustmen. Connected it and tried it but all I got was a whine from the motor so checked the drive belt and it was snapped .....removed the screws under the disc and the one on the front but who on Earth decided those washers were a good idea on something that needs to be removed to replace the belt . I'll drill them out tomorrow and see if there is some alternative fix when it all goes back together again .
Stuart_B
January 2010