buggymangp

hey guys
i hope you can help me out.
last night i was running my t maxx with an os 18 engine.
all was going well until i flipped the truck on its lid. i went over
and flipped it back. the truck went about 20 ft and then just revved up and won`t move.
as i walked up to the truck i thought i stripped a spur gear. not no. its fine.
it`s something it the trans. i pulled the trans apart and i can`t see anything wrong in there.
no stripped gears or bent shafts. i don`t know whats wrong. i think it might be the clutch in the trans.
anybody know whats wrong? i got the stock 2 speed with rev trans.

Mambamonster

I think your facing the same problem I am having with mine. Does the center drive shaft try to move? and Did you maybe loosen the gear that moves the center drive shaft?

buggymangp

hey mercedes
i don`t know. i only spilt the trans halfs and looked for
stripped gears and bent shafts. the clutch in there springs back and forward fine
and it was shifting fine between first and second and rev before this happened.
i got my maxx used for 100$ and it only needed an engine. i do have a LHS that pretty good with maxxs
so i guess i`ll take it there. this was the first time i took the trans apart. so it all new to me what goes on in there.
i know the savage trans by heart. LOL

matts6887

Sounds like either its something in the trans that went awry or its something in on of ur 2 diffs that went screwy...

buggymangp

hey matt
its got to be in the trans.
i checked the diffs. you know hold 3 wheels while you try
to turn the other wheel. they feel fine.

jayrguidaben

do you have th 2.5? check the 4995 part especially the yoke pin in the trans. this happen to me twice. ,

buggymangp

thanks jay
yea it did have the 2.5 engine. so its got to be an early model maxx.
but i put in the os 18 tm engine.
i`ll check it tonite. at least it gives me something to look for.

jayrguidaben

no prob.

buzz_333

buggyman, did you check to see if the slipper clutch was tight? Thats the easiest and simplest thing to check before tearing anything apart. Tighten the slipper nut to "snug" (do not overtighten) then back it off 1/4 to 1/2 turn. I don't know if that is your problem but it's a possibility.

buggymangp

hey buzz
thanks for asking but thats the first thing i checked.
i started the engine and tried holding the spur while i reved the engine.
i almost burnt my fingers trying to hold back on the spur. it grabs fine.

buzz_333

buggyman, the clutch will still turn the spur even if the slipper is loose, the clutch bell and spur gear are meshed together via the gears. The best way to check the slipper is (with the engine off) hold the spur and try to roll the truck backwards, if the truck rolls and you can keep the spur from moving then it is too loose. Hope this helps.

buggymangp

hey buzz
thanks.
now that i think of it. i don`t have the truck in front of me right now(at work)
i tried rolling the truck back and forth and the spur didn`t move. but it spins fine by hand.

jayrguidaben

your clutch is still good that happen to me before. the best way to check your slipper is tighten the nut and loosen it 1/4 a turn.

jayrguidaben

buzz that's just gonna work on foc (forward only conversion) only but if you have rev the spur gear just gonna spin freelly.

buggyman, the part #4995 (primary gears forward/reverse) has a yoke pin/drive pin. you can't see if the pin snap unless you take it out.

iamnot

there's also a one-way-bearing
in the transmission
that can start to slip
and cause your symptoms

i forget the part #
but if you need it
i can look it up later

used to only be a problem with the
old pro.15's
but i'm seeing it more
in the 2.5's
as they get older

buggymangp

thanks for the all help guys.
i put the trans back in last night without finding anything.
so i`ll pull it out again and check the things you guys are talking about.
i didn`t see any one way bearing in there. i might of missed it. it was getting late.

matts6887

Yep, that was a my bad on my part I meant to say the trans. Have u checked all the shafts to make sure nothing is bent or out of place?? If not i would do that to see because its possible that jumping etc could have knocked something out of place...

buzz_333

jayrguidaben, I still have reverse in my truck and I know that method works for me. Do a search for slippers and I'm pretty sure you will find the same procedure listed elsewhere. Anyway... I'm not gonna argue about it, just trying to give tried and true advice, use at your own discretion!!! I'm done!!!

jayrguidaben

chill out man!!!

buggymangp

yea. i looked for anything in the trans that might of looked out of place or bent.
but nothing jumped out at me. like i said. the t maxx trans is new to me. so i don`t know what to look for.
my LHS has always been good to me. so if don`t find anything wrong tonite. i`ll take it there this weekend.
they close be the time i get home from work.
thanks again guys for all the help. i`m no means a noob with nitros just this trans is something i never worked on before.
i wasn`t even looking for t maxx when i got it. but it was given to me for nothing and a just didn`t feel right taking it for nothing. so i give the guy 100$ for his trouble. i don`t bash it that hard. just small jumps and hill climbing.

buzz_333

Thanks for that little helpful piece of advice!!!
I don't post very often, but when I do it's because I KNOW what I'm talking about and I'm trying to help someone that is having the same problem that I have had in the past.

btw: chill out man!!![)]

buggymangp

hey buzz
i don`t post that offen too. only when i have a problem i can`t
seem to fix or looking to get a new nitro and want some feedback on.
i didn`t want to start a flame or bashing.
all this infor is a great place to start for the problem i`m having.
so . can`t we all just get along. after all rc cars are for having fun.
thanks again for everybodys help and i`ll let you know what the out come is.
when i find the problem.

iamnot

it's there
part #5393
i think

it's about $20 though
so
check everything else first

jayrguidaben

there's no 5393. remember he has 2.5 tranny with os engine

iamnot

the engine has nothing to do with it
and
the 2.5 tranny
certainly does have
part #5393
http://www.traxxas.com/PDF-Library/4902_tranny.pdf
http://www.traxxas.com/PDF-Library/4902_parts.pdf

for that matter
so does the 3.3
http://www.traxxas.com/PDF-Library/4902_parts.pdf