So far, my rail trucks have been OK. (knock on wood) However, the Climax locos have been a nightmare with the couplings splitting just like others have reported with gears on other locos. I told you that story to comment on the fix with brass tubing. I did this with the Climax couplings and it has held up very well. Use some calipers to get the normal outside OD of the gear shoulder in question, then get the closest ID tubing you can. K&S has a great selection. You may find either brass or aluminum available for your size requirements and either should work. Once you have it all ready to go with a dry fit, add your CA adhesive between the split on the gear and then around the outside of the gear shoulder then press the tube on to hold it all together. I used the full length of the 12" tube to make it easier to handle then cut it to length later. I also used a taper reamer to ever so slightly taper the tube to make it easier to align the small coupling into the tube opening. Once dry, cut to length. A small drop of CA on the shaft and then press the gear (coupling) on and you are good to go. It hasn't split or slipped since. (at least not that I can discern)
It's worth a shot. Hobby town USA carries a good selection of the K&S tubing and it is pretty cheap considering it can save what are otherwise very nice Bachmann models from being relegated to static display pieces.
It's worth a shot. Hobby town USA carries a good selection of the K&S tubing and it is pretty cheap considering it can save what are otherwise very nice Bachmann models from being relegated to static display pieces.