@tabora is right. if it's a HS928 then the drive belt is SA29. you do NOT have to split machine or V the housing to replace the drive belt only. just pry the top belt belt guide a little to pull the auger belt off top pulley and then work the drive belt off. You have to place the blower on nose and support it to work underneath and remove drive belt belt keeper or guide on bottom so you can remove the belt from bottom pulley.
then you can pull belt off from top. the first time doing this will take awhile. it usually takes me 10 minutes but have done it dozens of times.
the machine DOES need to be split for the auger belt. if , in the future you do this replace the impeller bearing as well. reference a you-tube video on this for the Honda HS55. same method. sorry , can not provide link to this but it is very good video for future.