hi I'm new and know nothing about these.i bought a traxxas truck for my son the man i bought it off said it worked fine but had drained the nitro so couldnt start it,so i went and got some nitro and tried it,the truck revs up jumps about a bit then when u press the trigger/throttle nothing at all happens except now and then it cuts out.the radio gear seems to be working ok as you can move the wheels but it will not move forward or backward it just wont do anything,any help would be greatly appreciated.forgot to mention the breaks seem to be locked on and its a tmaxx
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traxxas wont move
- Thread starter kerry
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unccpathfinder
RCTalk Qualifier
possibly burned up a clutch? I'm still kinda new to this too but that seems what it would be...to tell if it is the clutch you while "revving" it up look and see if the spur gear is turning (big black gear) if it is not turning then the clutch is most likely gone...
if the spur gear is turning check by hand to see if the spur gear actually turns the transmission...it could be that the friction pegs are worn out and need to be replaced...
but 1st make sure its in FWD b/c it could have had the fwd only conversion done and you may have it set in reverse and nothing is happening (I think all thats done is the reverse gear is removed)
if the spur gear is turning check by hand to see if the spur gear actually turns the transmission...it could be that the friction pegs are worn out and need to be replaced...
but 1st make sure its in FWD b/c it could have had the fwd only conversion done and you may have it set in reverse and nothing is happening (I think all thats done is the reverse gear is removed)
We're assuming it's a Traxxas T-Maxx since you posted in this forum if not we need to know what truck it is.
First verify that the radio is working the throttle properly, remove the air filter and watch the throttle valve in the carb. Open and close?
Then check the spur gear input. Can you rotate the spur gear freely and the clutch bell freely? (yes is good)
Next check the forward/reverse linkage and servo and make sure it is fully engaged in one or the other.
Then you need to check the diffs. Lift one end of the truck off the ground,spin one wheel. Does the other turn the opposite direction? (Yes is good) Then hold one wheel and spin the other, does the drive shaft rotate into the transmission? (Yes is good) Do the same for the other end of the truck.
If you find something locked from these checks then you know where to start fixing it.
If this is all ok, then set the truck on the ground and roll it forward. Does this make the spur gear turn? No, roll it backward. No, do you hear any movement in the transmission? There is an internal clutch in there (2.5 version)that could also be a problem.
If all of this is still good, it's time for a test stand run. Set it on something to keep the wheels off the ground and start it up. You should be able to make minor adjustments to the engine to get it responsive to the radio. Do the wheels spin and rev up while off the ground? If yes, then put it on the ground,hold the bumper and give it some throttle to see if tries to pull. If not then where is the power being lost? Is the clutch on the engine still turning the spur gear on the trans? No, check the clutch. Yes then it's probably inside the trans.
That should get you to at least be able to locate the problem then we can tell you how to fix it from there.
Let us know, Good Luck!
First verify that the radio is working the throttle properly, remove the air filter and watch the throttle valve in the carb. Open and close?
Then check the spur gear input. Can you rotate the spur gear freely and the clutch bell freely? (yes is good)
Next check the forward/reverse linkage and servo and make sure it is fully engaged in one or the other.
Then you need to check the diffs. Lift one end of the truck off the ground,spin one wheel. Does the other turn the opposite direction? (Yes is good) Then hold one wheel and spin the other, does the drive shaft rotate into the transmission? (Yes is good) Do the same for the other end of the truck.
If you find something locked from these checks then you know where to start fixing it.
If this is all ok, then set the truck on the ground and roll it forward. Does this make the spur gear turn? No, roll it backward. No, do you hear any movement in the transmission? There is an internal clutch in there (2.5 version)that could also be a problem.
If all of this is still good, it's time for a test stand run. Set it on something to keep the wheels off the ground and start it up. You should be able to make minor adjustments to the engine to get it responsive to the radio. Do the wheels spin and rev up while off the ground? If yes, then put it on the ground,hold the bumper and give it some throttle to see if tries to pull. If not then where is the power being lost? Is the clutch on the engine still turning the spur gear on the trans? No, check the clutch. Yes then it's probably inside the trans.
That should get you to at least be able to locate the problem then we can tell you how to fix it from there.
Let us know, Good Luck!
TWOCANE
RCTalk Addict
if it has a foward only converston (FOC) it doesn't matter if its in reverse. what do you mean jumps a bit? is your spur gear worn out? check like Racer1966 said and clarify truck.
Last edited:
- Thread starter
- #5
thanks for help heres the output
ok I've tried everything what you said and heres the output.(was i supposed to do this while it was running or switched off)
Then you need to check the diffs. Lift one end of the truck off the ground,spin one wheel. Does the other turn the opposite direction? yes they spin in oppsite directions Then hold one wheel and spin the other, does the drive shaft rotate into the transmission? when i do this the wheel will only turn a bit and nothing happens
Then check the spur gear input. Can you rotate the spur gear freely? yes
Can you rotate the clutch bell freely? dont know what the clutch bell is
First verify that the radio is working the throttle properly, remove the air filter and watch the throttle valve in the carb. Open and close? dont know what the air filter is
If this is all ok, then set the truck on the ground and roll it forward. Does this make the spur gear turn? No, roll it backward. No, do you hear any movement in the transmission? There is an internal clutch in there (2.5 version)that could also be a problem.nothing at all happens when i do this
ok I've tried everything what you said and heres the output.(was i supposed to do this while it was running or switched off)
Then you need to check the diffs. Lift one end of the truck off the ground,spin one wheel. Does the other turn the opposite direction? yes they spin in oppsite directions Then hold one wheel and spin the other, does the drive shaft rotate into the transmission? when i do this the wheel will only turn a bit and nothing happens
Then check the spur gear input. Can you rotate the spur gear freely? yes
Can you rotate the clutch bell freely? dont know what the clutch bell is
First verify that the radio is working the throttle properly, remove the air filter and watch the throttle valve in the carb. Open and close? dont know what the air filter is
If this is all ok, then set the truck on the ground and roll it forward. Does this make the spur gear turn? No, roll it backward. No, do you hear any movement in the transmission? There is an internal clutch in there (2.5 version)that could also be a problem.nothing at all happens when i do this
Last edited:
unccpathfinder
RCTalk Qualifier
the metal gear that turns the spur gear
its the black cylindrical thing with a filter element in it that attaches to the carborater (sp)
I assume this is an older Tmaxx so here is a link to traxxas where you can look at all the different manuals...with this you will be able to identify parts and learn more about the truck...hope it helps
http://www.traxxas.com/products/nitro/maxx/tmaxx/trx_tmaxx_views.htm
- Thread starter
- #7
tmaxx
i got it running,took it on the field and it was going fine until all of a sudden it would only go backwards and not forward.i have a feeling its something on the radio so on the controll it has 3 channels,channel 1 is pointing to the right,channel 2 is also pointing to the right and channel 3 is pointing to the left,is this how it is supposed to be
i got it running,took it on the field and it was going fine until all of a sudden it would only go backwards and not forward.i have a feeling its something on the radio so on the controll it has 3 channels,channel 1 is pointing to the right,channel 2 is also pointing to the right and channel 3 is pointing to the left,is this how it is supposed to be
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If that's the way it worked before, then they're right. They reverse the servos so you would definately know that something was wrong.
When you shift from forward to reverse seems to be the problem. If the idle is too high, it won't go in. You can also get caught in a "neutral" position with no motion, but you still can wind up the engine.
Check the idle, and then the linkage adjustment till it goes full throw from forward to reverse. You can only shift this at a full stop.
When you shift from forward to reverse seems to be the problem. If the idle is too high, it won't go in. You can also get caught in a "neutral" position with no motion, but you still can wind up the engine.
Check the idle, and then the linkage adjustment till it goes full throw from forward to reverse. You can only shift this at a full stop.