Glue bearings in gearbox on my 1850L?

[Demoniac]

Hi!

I'm assembling my 1850L's gearbox, and noticed that the second gear (clutch?) ball bearings are falling out of their sockets. I'm not sure if this would happen to the original metal bearings, there could be a microscopical difference in my Abec35 bearings compared to the originals.

Should I glue the outer ring of the ball bearing into the plastic part so they stay in place? I'm not thinking of CA glue on the whole thing, but maybe a tiny drop of thread locking or similar...

Take a look at these pictures;

(For some reason I can only upload ONE picture, even though the file size is 150kB per picture..)

[Tamiyabigstuff]

Just checked the build manual from a more recent truck than the 1850L and the part I think you are referring to is J7 - manual states 'Do not replace with ball bearings'

It shows 2 x 1260 metal bearings and instructs to fit them with instant cement - i.e. superglue.

[Axeboy]

Agree with above, if its J7 then it needs glue but its not clear from the pic if you mean J7 or the gear

If its the gear that they are coming out from then something is amiss

[Demoniac]

You're exactly right - the J7. Sorry for not being clear, I had a couple of pictures more, but for some reason it said that I wasn't allowed to upload them...

Anyways, I removed a couple of e-clips, then being able to remove J7, I tested it with the original metal bearings - same thing, they do not stay inside J7 when it moves.

The other gears are on a nut, and they are a bit wobbly too, but that's not something that can be adjusted. The problem with J7 is that it tilts a bit, then snaps in place when moving it, which I'm afraid will wear it over time.

AFAIK the best thing would be for the bearings to stay in the J7's slots at all times, moving back and forth with it, instead of the J7 moving on and off the bearings all the time.

Would a drop of CA glue in the J7's slots and then dropping in the bearings be a good fix...? Will the glue ruin the plastic? (melt like plastic models?).

[Axeboy]

You are meant to glue J7 mate. You have to used the metal bushes and not bearings too...

[Demoniac]

Oh, OK. It didn't say anything about it in the manual. They should really do some revisions on that!

I'll try with the bearings - the worst case scenario is that they get glued together and work like the metal ones, right?

Or would the original full metal bushings be better, as they might be better for sideways movement?

Btw. thanks for your prompt replies! I was really hoping to finish the gearbox this evening. I appreciate it!

[Axeboy]

No worries. Here's a pic from the High Lift manual:

[Demoniac]

Excellent!

Thanks!

They should include that with the 1850L as well, it makes sense!

I'll go with the bushings on that one.

But that's the only place right?

[Axeboy]

Yeah, just those two bushes

[MadInventor]

If it's any help I partially ignored the manual when building my 3 speeds, and glued in roller bearings with superglue. You have to be very careful not to seize the bearing with glue though.

[Percymon]

A thin strip of the thinnest double sided tape might also work, or even just a layer of tamiya masking tape. You're just trying to get a snug interference fit.

[Demoniac]

I went for the original bushings, glued them in with a gel super glue which worked on plastics, metal, wood etc.

Worked out perfectly!

Thanks guys!

[Axeboy]

Glad to hear it