ok then , did you adjust the cable ? could be a little slack .
correct drive belt is it ? does the tensioner pully have its spring ? you adjust the cable up on handle with slotted mounting holes .
these are the easy things to check otherwise its a teardown for a look inside the 'box , could also be clutch cone is worn or got grease on it , did you repack might have over filled it
if you can chuck up a photo of it as is now cover off and see whats doing in there
