just installed BL-WOW-now problem

[tha5150]

just installed the BL power for the first time in my 3906. MMM + 8XL. :D everything was fine through 2 sets of batteries. 7 cells then 6. huge diffrence in the 7 cells, HUGE. so i waited a few hours, played some GTA 4 and charged the 7 cells up, swapped the tires for dirt from street and took it down the road at the construction site.
20 min into my play time truck just stops. jerking but no movement. forward and reverse act the same. here is a small video, from my cell, sorry for the quality. but PLEASE help me out here.
i installed the idler gears from UE so i know thats not a problem.
as you can see, i can turn the spur gear 360 degree's but then stops. this is annoying and i am not sure if this is a problem or not.
there is no radio interferance. batteries are all full, even radio. so there is a problem somewhere else.
when i take it off the ground everything is fine. on the ground, nothing...

please please please help here.. 2 videos...

[Mike_D]

Have you pulled the tranny apart yet? It's been years since i've owned an e-maxx but i remember there was a small pin on the main spur gear shaft that would always break.

[tha5150]

Mike, thanks for the motor and stuff. niiice...

i did pull everything apart but i dont know what pin your talking about.

also, i just disconencted the driveshafts and the problem went away... ?? DickyT was over today and we heard the front one starting to go. of course, it was wheelie from one end of the street to the other, on the ground we heard nothing, once the front wheels touched, we heard it chreechsnappcracklepop (not sure how to spell the noise. lol )

Was that first video full throttle? Sounds almost like a little clicking of something catching, then not catching. Could also be an unfortunate MMM failure though. Do you have another ESC/motor setup to test and make sure it's not either component (do all possible combinations if you can).

[tha5150]

nope. blown titans. :\ yes full throttle... MMM problem huh? @*(&^(*#^(*#&)*#& NOOOOOOOOOOOOOOOOOO

[Mike_D]

I don't have my MMM yet but that does not sound like an esc failure, it sounds like something is grinding. Maybe the diffs? Have you disconected your motor and try rolling the truck yet?

[tha5150]

ya with everything one just like i was ready to go, there is no problem. too the driveshafts off and pulled the trigger and there was no problem.. you think this could be a diff problem? i dont know how to take them apart or even what to look for. i am new but picking up ya know?

[suicideneil]

Time to hit up the exploded views:

http://www.traxxas.com/products/elec...maxx_views.htm

The input shaft of the tranny has 2 little gears on it, both held in place by a small pin that goes through the gear and shaft. That may have sheared and gotten lodged in the gears. If however the problem only exists when the diffs are hooked up to the tranny with drive shafts, its more likely the problem is in one of them. Not suprising really if they are stock traxxas diffs.

[tha5150]

well i know the front is going so i might as well get a set. what is your honest opinion, keep price in mind, i am not rich by far. but what is the best bang for the buck on this stuff.. and where?? UE is expensive but i dont want to go buy stock parts and break them in a week ya know..

Originally Posted by Mike_D

I don't have my MMM yet but that does not sound like an esc failure, it sounds like something is grinding. Maybe the diffs? Have you disconected your motor and try rolling the truck yet?

Yeah, I'm starting to think it's not an ESC failure. I figured since he said it ran fine in the air, but when on the ground it did that, that tends to be a sign of a blown or screwed up phase from my experience.

It does sound like something is up with a diff though; more probable I would guess.

[suicideneil]

In order of cheap to expensive:

1. 3905 diffs
2. Alloy cup and ring gear with 3mm screws
3. Muggy/LST diffs: http://www.rc-monster.com/forum/show...709#post171709
4. FLM hybrids or UE

[Mike_D]

Before you go and start buying expensive parts that you may not need i would really look at the those exploded views on the traxxas website and find some time to take apart the tranny and diffs and see what is going on.

[tha5150]

i did take apart the tranny, noticed small plasic shavings, not everywhere. but there was evidence for sure. i cleaned out and put back together.

but remember, i have disconnected the driveshafts at the tranny and everything is fine. when there is no resestance when they are connected, up in the air, there is no problem either. so i think i am going to take the front and connect it, see if it jerks like that. then try the back. i know my front is going, maybe this is the problem.. will update in 5 min. scratch that, 1 min.

thanks for all these ideas guys.. seriously....
brb

[tha5150]

same problem when either which one is connected alone.. guess i have to take the diff apart and see whats going on in there.

[Mike_D]

If there is one thing that i have learned on this forum all these years is that grinding and clicking usually means blown diffs.