Shimming diffs in FLM Hybrid Bulks - Page 3 - RC-Monster Forums

mkrusedc · 12.10.2007, 12:30 PM

My pinion wasn't deep enough also and that was easy. They are new diffs, not the PRO diffs. I am not sure about buggy or truggy. They are the ones closest to the OE E-Maxx diffs. I don't have a way to machine out the case. The bearing does sit very tight. It is hard to get in and out of that half.

Serum · 12.10.2007, 12:39 PM

Check to see if there is no stuff in the bearing holes. use a toothpick to poke them out.

Are you using the 43/13 or the 43/10 diffs? if everything is tight in place, it's pretty hard to solve the problem. It either takes a deeper bearing hole behind the ringgear or behind the pinion.

The 43/13 diffs do fit in my diffs.

With no pinion in place; have you got any room on the diff inside the case? (4 screws tight in the diff, 3 screws tight in the bulks) try to see if you can move the diff left/right

suicideneil · 12.10.2007, 12:48 PM

The truggy diffs have spiral cut gears, the buggy diffs are 'normal'- easy way to tell the difference...

Serum · 12.10.2007, 12:53 PM

They are both spiral cut Neil.

lincpimp · 12.10.2007, 01:01 PM

My buggy gears were straight cut. Sounds like kruse has buggy diffs too, if he is trying to keep the ratio as close as possible to the stock emaxx ratio. If you are still having issues maybe I can meet up with you, I am only about 30mins north of you in Slidell. We can compare my diff case to yours, as I have to take mine apart again to put the modified output shafts in the diffs to run my ths cvd cups.

suicideneil · 01:10 PM

Huh? I thought the truggy diffs had spiraling teeth on the pinion & ring gear, like this:

http://www3.towerhobbies.com/cgi-bin...&I=LXJBM3&P=SM
http://www2.towerhobbies.com/cgi-bin...&I=LXJBM4&P=SM

and the buggy diffs have normal teeth, as it were:

http://www3.towerhobbies.com/cgi-bin...&I=LXLGU1&P=SM
http://www3.towerhobbies.com/cgi-bin...&I=LXLGT9&P=SM

EDIT: Images dont work, but links to parts do.
EDIT: I type too slow...

mkrusedc · 12.10.2007, 01:30 PM

Thanks for trying to help guys. These are the diffs:

http://www.rc-monster.com/proddetail...HPI_BUGGY_DIFF

One set fits perfect. The other I cannot close the case. I will check again(after work) to make sure it is clean maybe I missed something.

Since this case is the only one that all 4 bearings sit very tight in, it is logical to assume that the problem is the bearing seat in this case. Do you think Mike or FLM could change it out or machine out another .5mm?

Serum · 12.10.2007, 01:32 PM

Sure, don't worry about it. If the housing is wrong, FLM will fix it for sure!

mkrusedc · 12.10.2007, 01:50 PM

God bless The Monster and his army of elves.

I just an E-Mail from Mike that he would fix it!!!!!!!!!

Thanks again guys. I'l check this afternoon for dirt if none I'll send everything to Mike.

12.10.2007, 02:35 PM

Duster 360 is right about how to tighten the pinion, his methed for taking the slop out is exactly what I do the pinion can't move in and out anymore it also takes the side to side slop out of the pinion as well. Just remember not to put to much pressure on the pinion and drive cup when you tighten it or it will start to bind the bearings a little. If you don't use a good threadlocker on the set screw it will come loose and you will have to take everything apart again and do it over.

mmdooley · 12.17.2007, 07:58 PM

I have a question about the 1/8 FLM hybrids. Should there be any "gear whine" or should the gears quite.

suicideneil · 12.18.2007, 04:15 PM

I dont have hybrids, but I do have UE cases with the HB gears. When I bench test the Gmaxx I dont hear any noticeable gear whinning, but then again it would be hard to over the noise of the motor and spur/pinion etc. I would say check it by hand, to see how much slop there is between diff pinion & ring gear, should only be a tiny amount of play in any direction.

mkrusedc · 12.18.2007, 04:21 PM

I don't have mine assembled yet so I am not sure.

mmdooley · 12.18.2007, 07:19 PM

Quote:

Originally Posted by suicideneil

I dont have hybrids, but I do have UE cases with the HB gears. When I bench test the Gmaxx I dont hear any noticeable gear whinning, but then again it would be hard to over the noise of the motor and spur/pinion etc. I would say check it by hand, to see how much slop there is between diff pinion & ring gear, should only be a tiny amount of play in any direction.

Thanks Neil, Yea thats the problem I have, I can't tell if theres any gear whine because of the noise. I have checked by hand and can't find any problem. The reason I think there is gear whine is because when I spin the gear I can hear a whine but I can only hear it when I spin the drive cup because you can't spin the pinion fast enough. Should the case be filled with grease or just enough to cover the gears? I am going to pull it appart again and see if I missed something

suicideneil · 12.19.2007, 10:16 AM

When you say case, do you mean the diff cup or the whole thing? My diff cups are filled with 5k and 7k (front & rear, I forget which is which now...), but I just put a light coating of tamiya ceramic grease on the ring & pinion gears. As I turn the wheels by hand, you can hear a low pitched whine as the gears mesh and rotate against each other, but I think that normal for all metal to metal gears really.