"First, the gear/shift cable d
"First, the gear/shift cable does not hold these in gear.... friction and torque do. That is the design of the Conical Cone Clutch engagement via the vertical shaft spiral splines that the sliding sleeve glides on.
Morten's suggestion of a glazed Cup/Sleeve is possible. Use Extreme Caution if you allow anyone to De-Glaze the cup/sleeve. They must know what they are doing!
I understand what Morten is suggesting re; the ware ring (split ring keeper) (suggestion # 1 above) .... however, the sliding sleeve has more travel than what a worn split ring keeper or excessive vertical up/down end play could prevent as for engagement, particularly where initial engagement is achieved, IMO.
This is not to suggest that a new wear ring should be over-looked..... this is a critical part..... it is Brass..... and if even slightly worn (expanded), this part should always be replaced.
It's relatively inexpensive and takes only minutes to install during an over-haul.
Often, this part is removed anyway.... so installing a new one is a non-issue! (quite honestly, there should be no labor difference)
Morten's # 3 suggestion is right on the money! Your mechanic will/should know exactly what Morten is speaking of.
I believe that you have something else going on here. Again, IMO.
Sounds as though you should go through the transmission and have all parts inspected.
BTW, I'm seeing more of these in need of main drive gear bearings as many of these older units age! So I'd suggest that who ever does this, that he press the drive gear from the Bearing Box and inspect them.... replace....... re-shim for rolling torque value.... adjust back-lash!
I have these ready to go most of the time, but I am in the USA. Don't know if that helps much!
Also..... Don't over-look the importance of Re-Shimming when changing transmissions. We cannot simply swap one out to another without the shimming process being performed.
Good luck and I hope you find out what is causing this.
."
