Spur gear too big!? What the...?

[Nairb]

Man, I've had my XXXT for two and a half weeks now, but I still haven't driven it (for a few reasons). Right now I'm annoyed with my spur gear. It's too big for the gear cover! First I thought it was the cheap lexan gear cover being out of shape or something, so I thought, "no big deal, I'll just get an RPM one," but it STILL rubs. It's fine without a gear cover. It rubs with no motor in, with a motor it, whatever. I'm certain that it is rubbing, nothing else could be causing the sound and friction. I took apart the slipper and reassembled it, and it still rubs. I'm convinced the spur gear is too big, but why would they give me a gear that is too big? Duh! The manual says I have an 88 tooth spur, but the gear has no number on it anywhere. Another duh. What the heck? I'm going to make sure it IS an 88 tooth gear first, then I might have to go get a smaller gear. If so, what size should I get?

Man, this is lame. What should I do?

[This message has been edited by SteveP (edited 01-27-2001).]

[JoeTheShmoe]

Thats a major bummer... I think i might go drive my B3!! http://www.rccaraction.com/ubb/wink.gif


thats was a mean joke... i know.....
Im sorry. http://www.rccaraction.com/ubb/smile.gif

[XXXER]

Use the 82(yellow) or 84 or 86, jsut choose, and see if you can get the same gear ratio with a diff pinion than you were going to use, the formula kinda goes like this(someone correct me if i am wrong!)

say, you are using a 17 tooth to help gear down for your GM3
88 divided by 17=5.18
the internal gear ratio of the XXX and XXXT is 2.43:1 so, hmm, lemme think, is it that i divide one into the other or what, umm, well, it should be like 10.something or around there, what issue is the oen where steve tells about gear ratio's and roll outs? i will find it tonight, do the math, and figure it out tomorrow, okay big B?

also, they do not have teeth# on there spurs because they go by color, there are 2 black, 88 and 78, i have a 78, and there is quite a difference between the 2

[This message has been edited by SteveP (edited 01-27-2001).]

[SrSpeedy]

Hey man,

The TeamLosi gear cover works fine all the way up to the 90T spur.

IF you want to run the RPM cover, you will need to relive the cover a little. Since you have obviously ran it a little bit, you should be able to see where it is rubbing. You will need to grind a little material away in that area with the sanding drum in your Dremel.

This is a flaw in the gear cover by RPM.

Since you guys run on a small track, I would run the 90T spur(Orange). That will alow you to achieve lower overall ratios.

See ya...

[Nairb]

So this IS you still Sir (or Sr)?

Actually, I haven't run it yet. It is so obnoxiously loud when I just roll it, I knew I shouldn't try driving it that way without risking my gear's death. I know that the cover should work for up to 90, but mine doesn't for some reason. I wouldn't have bought the RPM one yet if the Losi one wasn't rubbing.

So Losi loves to go by color...I'm learning. Hey, yellow OBVIOUSLY means 82 teeth to everyone, how brilliant. NOT! I still think they should have numbers. Well, I think I'll go down a few teeth anyway. All that matters is that I get the same ratio between the spur/pinion (the inner tranny isn't changing at all), so I'll have to get comparable pinions. That shouldn't be too tough. Right now I have an 88 tooth, so maybe I'll go to 86 or 84. I'll just have to see...

[This message has been edited by SteveP (edited 01-27-2001).]

[BadRacer]

I have a XXXT and an RPM gear cover and i have had no problem. I have Losi's spurs from 84 to 90 and never heard a rubbing sound or noise from either one of the spurs. Maybe something is just tweaked by the factory because this is the first of someone saying anything about the spurs rubbing. Like i said i have had a 90 tooth spur and it has never rubbed on the gear cover or anything eles for that fact. Well good luck with the XXXT, once you get everything working you will know you made a right choice on trucks.

[SteveP]

Keep it clean, huh?! http://www.rccaraction.com/ubb/biggrin.gif

[XXXER]

BRIAN! what are you saying that SteveP needs to be editing?

[SteveP]

If you noticed Mr. Bylund, one of your posts was also "edited" for content. Please don't make my job any harder. http://www.rccaraction.com/ubb/biggrin.gif

[J mAn]

yah, the spur gear is eating away at the rpm gear cover on my xxx and xxxt. How can i lower the size of the spur gear without changing the gear ratio? Is there a certain method for doing that? Like for every 6 teeth on the spur 1 for the pinion or something like that?

[J mAn]

The spur has made an indentation in the gear cover about where the out drives are. And now all of the teeth are worn down. I still want to make the spur smaler though

[gubbs3]

Make sure you built the slipper right because if one of the pads has moved it will raise the spur and cause it to rub.

[Nairb]

Steve, what did I do? Please e-mail me at nairb5@bigfoot.com so I will know what not to do.

[BadRacer]

Oh yeah, i forgot to say somthing about that too. Gubbs is right, it happend to me, and i was mad about it to. But i mess around with the pads and ended up that they were just not on there right. I can't think of anything else cuz i havent had a problem like this before. Just gotta make sure that they are on there right, i put a tiny (i mean tiny) bit of white diff grease on the inside of the pad and spread it around. Then lined it up with the notches on the spur and put it together. Remember ONLY A LITTLE grease if you decide to do this. This helps the pad stick to the spur while you assemble it.

[This message has been edited by BadRacer (edited 01-27-2001).]

[SrSpeedy]

I would like to know why I can't use "SirSpeedy" any more as well.

All I do on this board is represent/promote the companies that help me out, and help out some kids.


Narib,

The spur on your truck is MUCH harder than the gear cover material. You would have to rub through a lot of covers before you would see any wear on a spur.

Just run the motor a little so that you can see where it is rubbing, and grind a little material away in that area until is does not rub anymore. Simple.

I run a 90 with the RPM cover all the time. I will work fine. If you go to a smaller spur, you will end up running a 16T pinion in stock, and who know what in Mod????

See ya...

[Nairb]

Well that's interesting. I wonder if the spur gear itself is the problem. I looked at it very closely and I noticed that a few teeth in a row were smaller than the rest. If that was true, maybe the whole gear is out of whack. I should try a new 88 tooth first to see if it works.

There's only one other thing I've thought about. I replaced the stock (ugly) motor plate with a heatsink motor plate, but it was still a Losi. This is far-fetched, but the holes for mounting the gear cover could be off just a bit and that could cause rubbing, but I doubt this.

Well, if a new 88 tooth won't work, I'm going with a new 84 tooth. This sure is lame.

[XXXER]

I am so stinkin emaberassed right now http://www.rccaraction.com/ubb/redface.gif hehe, sorry stevooooo

[Nairb]

Hmm. I guess that's true, Sir. I did just buy an 84 tooth, though. I worked out the ratios and 20/88 is the same as 19/84. I planned on using an 18 or 19 with my GM3. Less rotating mass is good anyway, isn't it? As long as it's the same ratio I should be fine, right? I don't really plan on going Mod any time soon. Besides, I don't have a dremel to grind away with. I dunno, I'll have to think about it.

[Nairb]

SteveP, why haven't you e-mailed me? (read above)

[SrSpeedy]

SteveP-

I would like to have my ? answered as well.