emax trans case
 

i have the half case for the sigle speed,has anyone got this and had problems with fitting of gears ,also idler gear rubbing inside of case and also the fitting of the gorilla max single speed cover,screw holes dont seem to line up.anyone had issues with this.ive emailed fastlane and mike about this but havent heard anything back from them. thanks

I have the single speed conversion and aluminum half on the way, are you saying I am gonna have problems with them.

I'll get mine in a rough week, i will let you know what i think of them.

So are you using the FLM Allu' gear case than transforming it into a single by splitting it and putting the Gorilla single speed cover on? Clever.

Mine half with the gmaxx single went together like it was ment to be. Have run 8 pack of batts on it. IT is doing real well. I had to tap the holes on mine so the screws would go deeper. I got the whole tranny to. Had no problems. sorry to hear about misalignment.

I've got the same problem with my single speed/FLM case. same thing as talked about in the first post. The trans has some major drag when tighten up. I will play with it more tonight to try and solve the problem.

Thank you,
Promod

I am waiting for mine, i will let you guys know what i experienced with them.

Nice to see you here again Promod.. Any new projects going on?

Nothing new that I'm ready to talk about yet:D .

Thank you,
Promod

I had a problem with the spacer being to thick on the output shaft. I removed it and put a thinner one in. I not sure if this is problem with these trannies or not. It was with another brand. Mine went to gether so perfect. It was liked made for one another.

I heard a whisper of 9S lipo w/ lehner2240.:eek:

After playing with this tranny case and having it together and apart a few hundred times. I just can't seem to get it to stop binding. The lower shaft and idler gear are smooth after grinding were the idler gear hit the FLM case. But the input shaft (top shaft) has some major binding. The single speed cover dosen't fit right on the FLM case. At the top of the case is were it is most out of alignment.
Maybe this is a bad case, not sure. But it is unusable the way it is now. I will try and fool with it more tomorrow.

Thank you,
Promod

Sounds like you got a bad one, got mine today and it seems fine, let you know for sure tomorrow

OK,i got mine solved,to a large extent,still not perfectly free.Basically it was binding really bad when i tightened the top half of the case(top 3 screws) both as a 2- speed and the g-maxx single speed.Basically the top shaft bearings are too close together ie. they didn't quite mill the bearing holes deep enough.I think 4mm bearings might be an easy fix but i ended up grinding down a top gear tonight to test the theory and it's much better than before.My top shaft's not running true now though for some reason,vibrates if you spin the tranny with a drill.I'll have another go tomorrow.

Gustav,
That is exactly what mine is doing. When you tightened the top three screws it binds very bad. Will try and grind some more room for the bearings.

Thank you,
Promod

You could use a drill to make them deeper (worked for my 10 and 16mm holes) the fit for the bearing supports the drill very good. You could use a cloth as a filler. (cloth will be teared where there is no room for it)

Is the top shaft hitting the back of the case threw the bearing. I not sure if some one has looked or not. Just a suggestion.

After about 5 hours work got this trans as smooth as GLASS!!
The case is too narrow as Gustav said.
I ground down the top gear to gain play. This did help but didn't solve the problem. I also took some material off the shaft where the idler gear rides. This also helped. What solved the problem was grinding some off the single speed case where the idler gear is.
The lower shaft was ok and even able to use the little shim/washer.

Here is a few pictures.

Thank you,
Promod

Here is where I took material off the single speed case. Sorry for the bad pictures but you get the idea.

Thank you,
Promod

Just to clear up the second picture. I took the metal off the flat surface where it would hit the idler gear. Not off the inside.

Thank you,
Promod

I think FLM may have tried to take the play out of the shafts being able to move in and out ,however every tranny i've ever worked with needs this play to run free.I have the single speed running good now doing similar to what Promod has described.

The 2-speed is more of a problem though,the topshaft and output shaft are both too tight(case too narrow).This is with no shims on the output shaft too.There's not really enough material to make the bearings sit deeper but Boca make 6x12x3 and 5x11x3 bearings but they're open bearings so the case would not be sealed.

I could use the narrower non-sealed bearings in one side of each output gears (the outside)and narrow the gear slightly(the part that sticks out and meets the bearing in the case,making it flush with the narrower bearing),so still using the sealed bearings for the case,i think this is the best solution for those wanting to use the 2 speed.For the top shaft using one 3mm bearing on the sealed side and grinding the top gear should be enough and will keep the case sealed too.

You had the same problem on a two speed as well. I wonder if they made more than one like this. I got the single and two speed trannies. Both of mine went together great. stock shim and no grinding. some one should talk to fast lane about this. Sorry to hear the trouble

Actually the output shaft is fine with the 2-speed too,so ignore what i said about the output shaft in my last post,i must be losing it.The topshaft is way too tight though,actually locks the tranny completely if you tighten the top half.I think the use of 5x11x3mm bearings on the topshaft will solve this though so i'm not concerned about it.I'll report back after i try the narrower top shaft bearings.

Coolhand,does yours spin free with the top screws tightened up then?I'm suprised if they're not all the same because they're machined by computer so the tolerences will be small.

My tranny is tight and in the truck. I have run about 8 packs or so on the single and 12 packs on the two speed.

I got mine running really good now as a 2-speed.I'm not really sure what the problem was to be honest but all of a sudden it goes together perfectly.I got the topshaft bearing to sit just a fraction further into the case,though i'm not totally sure that's what the problem was,i removed a little bit of material in a few areas.Anyway it's fine now,mesh seems perfect,very smooth,i like it alot.

Great, informative post, Promod! I just built two single speed trannies yesterday and did EXACTLY the same things you did to make it work smoothly. I mean exactly the same stuff! It took me a little over two hours to figure out/build both trannies(well, once I figured out the first one, I knew what to do with the second one!). The lathe came in pretty handy to modify the top gear.
I will address this issue with FLM. It seems like if they added a simple 1mm to the width of the motor half(part that mates with G-maxx single speed), it would solve the problem for both applications.

why are some people not having problems then?

I am curious of this my self. Mine went together like factory. Did they change something between the batches?

I imagine there are some reasonable explanations for this. All machine work has tolerances. R/c, generally, isn't required to be super tight on the tolerances(though the tolerances are very close..say within .005" or so). It would be reasonable to expect a few parts here and there to be on the outside of the tolerance, particularly from two different manufacturers(actually three, counting the Traxxas parts, and 4 if it had a steel idler gear). If the g-maxx case was out .005" one way and the FLM was out the other way, you now have .01" total "out" from the design. It is also reasonable to assume that the designs themselves may be within .01" or so from perfect alignment(which is close enough for most applications). Dull tools, a slight shift in the machine...who knows, really? The key is to make the parts so that they work within these factors. Adding a mm to the case thickness wouldn't make anything sloppy on the parts that fit flawlessly, and would probably free up the "tight" parts as well. I knwo the two trannies I built both had slightly different fit, and I built them both at the same time with the same parts. Remember, Traxxas parts also have tolerances(for example, one of the input shafts spun truer than the other) as well, so the aluminum single speed is a mix of parts from a few different manufacturers.