H fifth gear jumps out

jerry hakenwerth · Jun 29, 2010

Thanks in advance . I have read all the archives pretaining to this subject. I have removed the cover of the transmission, everthing looks good all the gears including fourth and fifth slider, there is very little play in the shafs from front to back, the only things i see to do is replace the springs and balls. the forks are straight and dont look worn, any other thoughts would be appreciated

Haas · Jun 29, 2010

You really can't see the condition of the 5th gear very well until you take it out. When the gear is in neutral, you may be able to see a little. The gear is really a coupler that connects the input transmission shaft to the top transmission shaft so it is direct drive through the transmission. The popping out of gear problem is most usually that the internal teeth on the 4th/5th slider gear have worn down from grinding the gears. The second reason is the at the pilot bearing is worn out and has play. It will be side to side play, not front to rear. If you have any play in the rear top shaft then that would indicate the pilot bearing is worn. I'm assuming you have a parts diagram so you can see how the thing goes together.

Janicholson · Jun 29, 2010

Haas is accurate.
I think the teeth can also be seen with the slider all the way into forth. The splines only engage about 3/16 of an inch, so it takes little wear to taper the splines on both the input shaft, and (less visible) the internal splines on the slider.

A new input shaft (or very good used, checked carefully) and a new 4th-5th slider will fix it. If noise is no issue, that is the way to go. If 4th noise will bug you forever, Replace the 4th counter shaft gear as well, with a running mate, or new. Jim

pete 23 · Jun 29, 2010

Once you get a wear pattern on a gear from jumping out of engagement it is difficult to overcome, however, I have had some success with adding a washer behind the rear bearing on input shaft to put it back a little farther. Problem is you already have cover off so it would be a lot of work for nothing if it doesn't work, but then, labor is cheap on your own rig. Loose bearings on the input will of course have to be taken care of also, and pilot brg. When cover is on,trans in fifth gear you can readily see if it is getting a good bite on input shaft and still not being forced against fork. Might get a little constant mesh gear noise but I just did an M and it is quiet.

H fifth gear jumps out

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jerry hakenwerth

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