Hi, my speedo drive gearbox is so worn out that I cant get the speedo drive to stay in place without the wheel being stiff to rotate. If I loosen off the wheel spindle nut then the speedo drive spins around. I am sure the driving collar is correctly located in the speedo drive. But the tangs in the drive are really worn and chewed up, in fact the whole thing is shagged out... I have the correct components in the correct order including the spacer that I asked about in an earlier post. That is: Bobbin shaped Spacer (37 below) Speedo drive (38) Outer distance Piece (39)
I was thinking about fitting an electronic cycle speedo anyway. If I junk the speedo drive is there any reason why I cant replace all three above components with one long bobbin shaped spacer of the correct length? As always thanks for your expert help.
Provided the wheel bearing has intact rubber seals, can't see a problem.I am surprised that it jams up.Does the drive turn freely when it is removed?Are there any scrape marks to show where it is binding?
The drive snags and jumps if you turn it by hand. Its junk.
All of which could have been avoided if you had only greased the drive unit every year when you greased your swing arm. You do grease your swing arm every year, right?
Older wheels used for competition without a speedo, such as the T120 TT, had a closure available to seal that bearing off. But there is nothing like that available for the conical hubs. If you go electronic, you might consider pulling the caps off the current drive unit and building a dust cover by filling the current body with "filler epoxy" such as "JB Weld". That will provide some protection and keep the aesthetics high.
Well i bought the bike as a rusty pile of bits so have had no input on its past maintenance... judging by the state of the rest of it I find that maintenance of the speedo drive is very unlikely! Oddly the swing arm bearings are fine though, I have pulled them apart and cleaned and greased them AND fitted new grease nipples so you can sleep easy Mr RF knowing that there is at least one old Triumph no longer dying of neglect!
PING!: dim lightbulb flickers on... I suppose I could just fit the housing back without the driving "collar" (42) so its simply acting as a spacer and dust seal?