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Thread: Spur gear

  1. #1
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    Spur gear

    Is it normal to melt the spur gear within 15 minutes of very 1st use of my erevo? It was the stock 65t with 2 3s lipos. I just put on the 54t spur gear for now. The teeth on the 65t were fine. It had melted where you screw the gear to the clutch. the spur gear pretty much looked like a donut. The motor was hot is that normal?

  2. #2
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    No, that's not normal.

    Sounds like your slipper clutch was not tight enough...the slipping created heat and melted your spur would be my guess.


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  3. #3
    RC Turnbuckle Jr. MITCH316's Avatar
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    No, watch your motor temps. I've done that from excessive speed runs...the tyres you are running would have a lot to do with it too. I ran 18/54 and 20/54 for a while, it's a good place to start. Check slipper clutch too, I normally tighten all the way and back of a 1/4 turn.
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  4. #4
    RC Turnbuckle Jr. 87 GN's Avatar
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    you did not break in the slipper per the manual. you need to break in the slipper with the NiMH batts or 2/2s, then you can start running the 2/3s.
    gl2u

    and a bit more info for you

    AOD's links......


    Erevo 101:
    EREVO FAQ

    Lipo, LVC, Brushless & Battery charger/charging guides & purchasing links:
    TUTORIALS

    Refer to this to setup the Mamba Monster ( MMM ) esc for maximum performance:
    CASTLE LINK GUIDE


    Refer to this to find parts, upgrades, batts & chargers etc:
    USEFUL LINKS


    Direct from Castle Creations ( the esc manufacturers ):
    MMM FAQ

    Driver's ED Manual

    LED warning light meanings
    Would you go flip my truck back over??

  5. #5
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    Thanks for the info. Can y'all tell me how to properly align the pinion and spur gears?

  6. #6
    RC Turnbuckle Jr. MITCH316's Avatar
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    I normally take a piece of paper and cut a bit wider than the pinion gear, fold in half so the paper is double the thickness. I put the paper between the gears and push together, then rotate the gears slightly up and down to get a good mesh. Tighten the motor bolt and pull the paper out.
    Rock n Rolla !

  7. #7
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    i had the same thing happen just not as soon as yours did and it was my slipper cltuch was way to loose and it also burnt my motor up.it didnt even make a sound like it was loose but it was and castlle replaced the motor for free except for shipping but all is good now i tighten mine all the way till nut is tight then back off a 1/4 turn and have never had anymore probs like that

  8. #8
    RC Turnbuckle Jr. 87 GN's Avatar
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    Slipper Clutch Break-In
    The E-Revo Brushless Edition’s slipper clutch requires a break-in procedure
    to ensure consistent operation with the extremely high power output of
    the included Castle Creations Mamba Monster brushless motor system. The
    slipper clutch has been adjusted to the correct initial setting for break-in.
    Follow these steps to ensure maximum performance and life from your
    slipper clutch:
    1. Make your first runs with the model using the stock gearing and 6- or
    7-cell NiMH packs, or 2S LiPo packs.
    2. Drive normally. The slipper clutch should slip momentarily when
    accelerating aggressively on high-traction surfaces (you will hear a
    whirring sound when the slipper clutch allows the spur gear to slip).
    3. If excessive slippage is noticed (slipping that lasts for more than 3
    seconds under hard acceleration), or the slipper clutch slips anytime
    the throttle is applied at any lever, stop driving immediately. Let the
    slipper clutch cool for 10-15 minutes. When the clutch is cool, test-drive
    the vehicle again. If you still experience excessive slippage, allow the
    slipper to cool once more, then tighten the slipper nut turn (turn the
    nut clockwise) and repeat the break-in process. Do not adjust the slipper
    clutch before it has cooled.
    4. Continue to run the vehicle and monitor slipper clutch performance as
    noted above, and readjust if necessary. When the run is complete, the
    slipper should be fully broken in.
    After break-in, the slipper clutch is ready for any type of driving, with any
    batteries up to 6S Lipo. Set the slipper clutch so it only slips for a moment
    (if at all) under hard acceleration in high-traction conditions. If excessive
    slippage is noticed, stop driving immediately. Continuing to drive with a
    loose slipper will cause damage to the slipper unit. You must let the slipper
    cool down to ambient temperature before tightening the slipper nut and
    resuming driving.

    http://traxxas.com/sites/default/fil...KC1491-R00.pdf
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  9. #9
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    I'm using the ESC and motor from XO-1. All the spur I put there always get melted, using 6s. I did the breakin method but may the motor is geting so hot. I'll try to decrease the ratio (25/54) maybe this could be the problem. If I use the Robinson Spur (metal) maybe can I resolve this problem? What do you guys recommend?

  10. #10
    RC Turnbuckle Jr. 87 GN's Avatar
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    we need your temps......

    Hot motor + cool esc = under geared.
    Cool motor + hot esc = over geared
    Everything warm just right..

    Motor ~ 180/190*F (82/88*C) maximum, ideally 140/160*F (60/71*C), temps can be 10*F higher inside the motor
    ESC ~ pretty much same temps / Fan comes on @ 150*F (65*C)
    Lipo's ~ 140*F (60*C) max, ideally 100/120*F (38/49*C).........
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  11. #11
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    I got the temp, the motor was almost 80C and the transmission, 120C. The ESC was about 60C maybe or very close to this. The transmission was so hot, I had to change the spur, lucky of me, I had another one to change. But the run could make three or four sprint and after that, the clutch was running in false, and the car couldn't run anymore.

  12. #12
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    Sorry but what is ESC? And what do you mean by under and over geared?

  13. #13
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    Nevermind on the ESC question.

  14. #14
    RC Turnbuckle Jr. 87 GN's Avatar
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    over geared............. geared to high
    under geared........... geared to low
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  15. #15
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    i find most people are afraid to tighten slipper up too tight

    tighten it with supplied tool using one hand and pretty tight
    then back of 1/4 turn like most suggest
    it will still feel tight on the tool but dont be scared

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