2 speed trouble

[Camp Racing]

I just got a jato 3.3 from a freind and this thing will not shift in to second gear. When it shifts it just free wheels and revs the engine then when the rpms come back down it will shift back in to first and go any ideas?

[RODNEYC864]

sounds like second gear is stripped. open up the tranny and look for teeth missing on gears. here is second gear if you find this is the problem. http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXKMK0&P=X

[forbes]

i had the same problem but with first gear. i cracked the case and found a stripped gear.

[Camp Racing]

nope I just popped open the tranny case and found no stripped gears. I also looked at the little paw in the two speed hub and it looks fine also.

But thanks for the ideas

[RODNEYC864]

if no stripped gears then sounds like its not engaging to second. i would find out if the friend has been in the tranny or look at the exploded veiws and make sure all the gears are installed correctly.

[DavidS302]

I am just thinking out loud.

All the gears are meshed all the time. At slow speed the one way bearing (#5593) drives first gear when the RPM gets to your shift point the centrifugal force flings the arms out and they engage the pins located inside the second gear ring. This causes the main shaft to “outrun” the OWB. If the shift hub wasn’t working it would stay in first gear if second gear were stripped I also think it would stay in first because it again wouldn’t “outrun” the OWB.

I think what might be happening is just as it tries to shift into second it engages just enough to release the OWB but hasn’t engaged second enough to keep going and with the speed differential the OWB can’t re-engage.

The order I would check is.
Try to slightly lower the shift point. If that doesn’t help see if the pins inside second gear are OK. If that doesn’t yield any results I would clean or replace the OWB.

If any of this works please let know for future reference.

[DisturbedNitro]

Also check inside the 2nd gear where the 2nd gear hub sits to ensure that the catch pins are still there. i've broke the pins out several times and the teeth on the gear be fine. You may also need to find out if the shift point has been changed. Sometimes if the adjustment screw is tightened to tight it the spring inside can become stuck thus not shifting. Hope that helps. I have to replace the second gear about every 1/2 gal sometimes more. This can be avoided by loosing the slipper clutch some. But i cant stand the slipping i want max power to the ground. :P.

[Camp Racing]

thanks guys I looked at the pins in the 2 speed hud and there are still there. I also just pulled the setscrew and spring/ball out of the 2 speed hub and all is well.

the thing that gets me is that it will shift but the tranny is not engaged. I run out about 10-15 feet and it will shift and just rev up. I let off the gas and it will down shift and then go.

I just looked at the 2 speed shaft and all the pins are in place and the set screw that holds the gears on the input shaft are there also.

[1chucked]

I dont know what is up with that, 1st gear will keep it going if anything in 2nd failed....

[DavidS302]

I dont know what is up with that, 1st gear will keep it going if anything in 2nd failed....
That's why I think you have a problem with the OWB. Pull it out and clean it I think that may fix it.

[Camp Racing]

That's why I think you have a problem with the OWB. Pull it out and clean it I think that may fix it.

I will do that tomorrow and let you all know how it goes

again thanks for all the help

also I found a bearing missing??? it was the one that goes in front of the 2 speed hub in the plastic gear but I dont think that would have anything to do with it.

[DavidS302]

I will do that tomorrow and let you all know how it goes

again thanks for all the help

also I found a bearing missing??? it was the one that goes in front of the 2 speed hub in the plastic gear but I dont think that would have anything to do with it.
That surely couldn’t help. If it’s letting the shift hub get out of alignment it could be hitting the second gear pins just enough to disengage the OWB but not enough to drive the truck. I think that may explain what is going on.

[1chucked]

the owb will only disengage is it goes in a different direction, what you are saying makes no sense. Have any of you giving help even ever had a transmission apart? Mine just started doing this last night until it was warmed up... Im clueless as to what it could be.

[DavidS302]

the owb will only disengage is it goes in a different direction, what you are saying makes no sense. Have any of you giving help even ever had a transmission apart? Mine just started doing this last night until it was warmed up... Im clueless as to what it could be. I do indeed understand how a OWB works. If his transmission temporarily shifts into second it would disengage (turn the other way as you call it). If second gear were to then become disengaged there would possibly be too great a speed differential (spinning too fast) for the OWB to catch until the RPM comes back down.

A dirty OWB could potentially contribute to this. You might try cleaning your OWB also.

BTW the transmission is the little box up front with the wire sticking out of it.:p JK

[1chucked]

hmmm... I guess the centrifugal forces will keep the owb "teeth" or whatever they are called, from grabbing....

[DavidS302]

Once it slips if it were to reengage at high RPM it would probably cause a catastrophic failure of something. It would most likely be first gear because of the rotating mass inside the transmission.