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  1. #1
    RC Qualifier MilitaryRcDude's Avatar
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    Front wheels are just spinning and the rear arent doing anything

    The rear don't have much power or no power but the front wheels just spin what do I do?

  2. #2
    RC Turnbuckle Jr.
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    depends on what is wrong, do the rears spin at all? have you checked the driveshaft? have you checked the diff? have you checked the axleshafts?

  3. #3
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    Hold 3 wheels fromspinning and try to turn the 4th, it should NOT spin. Repeat till you have tried to spin them all on their own, if one is able to still spin while holding the other three, you have a broken driveshaft. Probably both wheels on that axle will be able to. From your description it will be the rears. Figure out which shaft is broken, and replace it with a revo shaft.
    Dacaur

  4. #4
    RC Qualifier MilitaryRcDude's Avatar
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    The rears do spin but really slow the right doesn't spin at all or very little I checked the middle drive shaft it has some scratches but no cracks. I have not checked the diff. The axleshafts are good.






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  5. #5
    RC Qualifier MilitaryRcDude's Avatar
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    Thank You Dacaur that helped the rear wheels did spin. Where can I find the rear drive shaft I'm a newbie to the hobby the summit is my second truck. Any web links would help.



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  6. #6
    RC Qualifier MilitaryRcDude's Avatar
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    What kind of driveshafts would you recommend? Steel, Aluminum or Plastic


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  7. #7
    RC Turnbuckle Jr. Petertje60's Avatar
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    See if this exploded view helps. If you want part numbers, you can look here but on that page you can not see where they are located.
    Nobody is born with experience

  8. #8
    RC Qualifier MilitaryRcDude's Avatar
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    Thank you Petertje60 do you know what the rear drive shaft looks like like I said I'm a newbie. The Summit is my second rc.



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  9. #9
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    It's likley one of the two that go from the middle out to the wheels, spin the tire, the driveshaft is the part in between the upper and lower suspension arm that also spins. Look closely at each one as you spin the tire and you shoukd be able to see which one broke... there is also another one for the rear located in the center under the skid plate, but it's very unlikely that's the problem.

    I would just replace the broken one with a plastic mini revo shaft
    Dacaur

  10. #10
    RC Qualifier MilitaryRcDude's Avatar
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    Any idea if I should get plastic again aluminum or steel?
    Where could I get the cheapest price but still quality parts besides Traxxas?


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  11. #11
    RC Qualifier MilitaryRcDude's Avatar
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    The two back drive shafts have a lot of play in them. Where they meet the diff case I don't see any cracks in the drive shafts. Is there supposed to be play in the rear drive shafts? There isn't any play in the front drive shafts. Do I have to take the diff apart to take out the drive shafts or just the skid plate? I REALLY APPRECIATE YOUR GUYS HELP!!!! THANKS PETERTJE60!!!

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  12. #12
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    You need to figure out which shaft is the problem. Its very very unlikely that more than one is broken, as once it lets go, that takes all the strain off the other one.... if its one of the two that go from the center to the wheels, you only have to remove one end of the suspension arm to change it (you do that by sticking an allen wrench into the hole in the metal ball at the end of the arm). If it turns out to be the center shaft, that's more complicated, but like I said, that's very unlikely....

    One way to figure out which one is broken if you cant tell by looking, hold one front tire and one back tire, and then spin the other front tire by hand. If the back tire you aren't holding doesn't spin when you spin the front tire, the driveshaft is broken.
    Dacaur

  13. #13
    RC Qualifier MilitaryRcDude's Avatar
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    How do I tell if a shaft is broken? Both of the rear tires do not spin.



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    Last edited by MilitaryRcDude; 03-26-2015 at 08:16 AM.

  14. #14
    RC Qualifier MilitaryRcDude's Avatar
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    Do I have to take the tire off or take the diff apart to tell if it is broken?



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  15. #15
    RC Qualifier MilitaryRcDude's Avatar
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    Is the middle driveshaft broken and not giving power to the rear diff?




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  16. #16
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    its possible. is the shaft connected? pictures help. also the play in the rear wheels can be the plastic yokes. if you gun the throttle alot on dirt/grass you will wear the yokes quickly. (the yoke attaches to the diff with a black set screw, one on each side) usualy the rear shows more wear then front because the rear pushes the weight of the truck when in power so more force = more wear. visualy check all drive shafts. there should be 6.

    for a quick check on the shafts\diff set the brake 100% try to move the front wheels then move to the rear. (truck off the ground) try to spin both rears, try to spin both fronts, then check side to side. if theres easy movement in both rear tries, 9\10 u have a bad dif, (as long as the shaft is okay)
    Last edited by mxaustin; 03-26-2015 at 09:30 AM.
    2.5r Pede, 2-speed O.S.21tm rusty , 3.3T-maxx

  17. #17
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    So if you spin one rear tire, does the other spin as well (either direction)? If yes, then it probably is the center shaft. You can 0ull the bottom skid plate and take a look at it.
    Dacaur

  18. #18
    RC Qualifier MilitaryRcDude's Avatar
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    No each tire spins freely but the other does not spin.



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  19. #19
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    did you apply the brake?
    2.5r Pede, 2-speed O.S.21tm rusty , 3.3T-maxx

  20. #20
    RC Qualifier MilitaryRcDude's Avatar
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    Yes



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  21. #21
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    all four spin free? with brake applied? front- rear- side to side? all?
    2.5r Pede, 2-speed O.S.21tm rusty , 3.3T-maxx

  22. #22
    RC Qualifier MilitaryRcDude's Avatar
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    I'm trying to upload some pics

  23. #23
    RC Qualifier MilitaryRcDude's Avatar
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    The two rear spun freely the front the front kind of did. When I spun the right tire the left spun to the left.



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  24. #24
    RC Qualifier MilitaryRcDude's Avatar
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    In the front when I spun the right tire the left tire spun backwards

  25. #25
    RC Qualifier MilitaryRcDude's Avatar
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    So do you think that it is a bad rear diff instead of a bad driveshaft ?



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  26. #26
    RC Turnbuckle Jr. Petertje60's Avatar
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    In fact there are 6 drive shafts. Two that go from the gear box to the diffs and four that go from the diffs to the wheels.

    If the car is standing on the floor, and you can lift one wheel ans spin that freely without anything else spins too, there is something broke between the diff and the wheel. That can be the drive shaft or something else.

    If you lift the front wheels together and you can spin those in a way that the wheel on the opposite end spins in the other direction, the drive shafts from the front diff to the wheels are fine. You can do that same test on the rear end.

    If you lift the front wheels and you can spin those in the same direction without the motor and/or the rear wheels start to spin, you probably have a broken center shaft.
    Nobody is born with experience

  27. #27
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    get pix and a video if you can. take a pic of EACH axle and each ujoint
    2.5r Pede, 2-speed O.S.21tm rusty , 3.3T-maxx

  28. #28
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    Quote Originally Posted by mxaustin View Post
    did you apply the brake?
    This is an electric, there are no brakes to apply unless its moving....

    Unless the thread is in the wrong spot... just to be cleare, thus is a 1/16 mini summit we are talking about right?
    Dacaur

  29. #29
    RC Qualifier MilitaryRcDude's Avatar
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    Yes this is a 1/16 vxl summit I went to my hobby shop they said that is the diff I took it apart but I can't tell how it seems to be broken? How do I see if its broken?


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  30. #30
    RC Qualifier MilitaryRcDude's Avatar
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    I didn't expect to blow steel gears on the diff that easy but for sure I'm going to have to replace main driveshaft.



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  31. #31
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    What you described doesn't match a blown diff...
    Dacaur

  32. #32
    RC Qualifier dr frankenstyle's Avatar
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    I just did a quick web search and youtube has a few videos about rebuilding the 1/16 e-revo diffs (pretty much the same thing) and shafts and others that may show you some good stuff.
    have to agree, doesn't really sound like the diff's the problem.
    Last edited by dr frankenstyle; 03-26-2015 at 03:24 PM.
    chop it up ... stitch it up ...It's ALIVE !!!

  33. #33
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    i am sorry i was not aware electric vehicles didnt have brake setup.
    2.5r Pede, 2-speed O.S.21tm rusty , 3.3T-maxx

  34. #34
    RC Qualifier dr frankenstyle's Avatar
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    Well.... they do have electric "brakes", that is if you trigger forward first, then back-trigger, the ESC magnetically stops (and will, kind of, hold) the motor.
    ...but ... I could be wrong ...
    chop it up ... stitch it up ...It's ALIVE !!!

  35. #35
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    I prefer manual brakes lol...
    2.5r Pede, 2-speed O.S.21tm rusty , 3.3T-maxx

  36. #36
    RC Qualifier MilitaryRcDude's Avatar
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    I meant broken teeth.



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  37. #37
    RC Qualifier MilitaryRcDude's Avatar
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    Thanks dr frankenstyle for the videos



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  38. #38
    RC Qualifier MilitaryRcDude's Avatar
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    I thought mx austin meant when the summit was on!!!



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  39. #39
    RC Qualifier MilitaryRcDude's Avatar
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    Any idea how I can tell what gear in the diff is broken?



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  40. #40
    RC Qualifier dr frankenstyle's Avatar
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    You can disassemble it completely, but you'll need some oil to re-fill it. There are just 3 small gears (spider gears) and their shafts, and the side gears have pins thru the output shafts. If you have the diff out, you can check it before you tear it down by holding the outer ring gear and turning one of the side shafts (allen wrench thru the hole) and the other side should rotate in the opposite direction.
    Your problem just seems like something other than a broken diff gear. jmho
    chop it up ... stitch it up ...It's ALIVE !!!

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