Thanks to Alan Noakes I learned a lot about the gearchange mechanism.However I would like some more advice. Within the gearchange there are two springs that bear onto a slotted head pin which is bolted through from the back of the gearchange. There is a further pin which bears down between the ends of the two slightly semicircular springs. The machined casting that holds all of this together appears to be surrounded by a steel band. My questions are as follows.
1/ What purpose does all of this serve. 2/ Can the steel band be removed 3/ Would either of the two pins affect the gear selection if worn
4/ How does one hold back the springs in order to re assemble this machined casting back onto the main body of the gearchange.
Advice will e very much appreciated. Thankyou.
The purpose of these springs is to centralise the footchange lever after each gearchange.
The band is a push fit over the central hub and can be pressed off, it is a little more difficult to get it back on requiring the two springs to be held in place with a jubilee clip as it is pressed back on.
If you find the springs are worn I have new ones as does the spares scheme.
The pins should not affect the operation if worn. The short one held in the centre boss is merely there to hold apart the spring ends so the whole unit can be assembled onto the backplate.
Hope this helps
Thankyou Eddie,that was most informative. However it raises another question, How do you determine if the springs are worn.At the moment it is very difficult to prise the springs apart using a screwdriver, so they appear to be very strong. I would also like to know how to put the assembly back on to the main casting, Does one have to unbolt the pin,press it between the two springs and then re bolt the pin.
Hi Roger, yes you are right the pin should stay between the springs and be assembled as a whole assembly,when I spoke to you at Shuttleworth I don`t think I explained the importance of getting the moving ratchet plate into the correct position by adjusting the length of the linkage between the moving plate and the gearbox indexing lever, this dictates the point of engagement between the pawl and ratchet plate and the amount of movement given to the linkage before the pawl hits the stop plate, hope this helps. Alan Noakes. firstname.lastname@example.org