Results 1 to 11 of 11
  1. #1
    RC Racer
    Join Date
    Mar 2012
    Posts
    186

    Think I broke my maxx

    It was running great then went down on power a little and ran out of gas. New gas, starts right up, revs out but dosent go fast. All shafts are intact. Old max 2.5 converted to 3.3 with foc.

  2. #2
    RC Qualifier
    Join Date
    Mar 2012
    Location
    Pittsburgh, PA
    Posts
    662
    Do you have a grinding sound? You may have blown out your diffs. I had the same thing happen to me, just buy the brushless emaxx diffs or if money is an issue, get some 3.3 diffs off of eBay. Good luck!

    You can test by holding either the two back or front wheels off of the ground with the opposite wheels planted and try to spin them forward. If you hear any grinding or crunching there's a good chance the diffs are shot. The old style two screw 2.5 diffs cannot handle the 3.3's power.
    Last edited by Maxximum Overdive; 05-06-2012 at 10:44 AM.

  3. #3
    RC Racer
    Join Date
    Mar 2012
    Posts
    186
    If I put one end on the ground and spin one of the tires thats off the ground, the other tire off the ground spins. No grinding noise.If i hold one of the tires thats off the ground and spin the other, I can only move it a little then it locks up.With the front tires off the ground I spin one fast , then stop them with my hands, the exposed gear on the trans spins freely for a few revolutions.

  4. #4
    RC Competitor
    Join Date
    Nov 2010
    Posts
    98
    Your diffs and drivetrain sounds like theyre working right. I would check your carb settings first. Put it back to factory reset. Also, i would change out the glow plug. That often can solve a lot of problems. Lastly, check your engine seals. Especially in the exhaust. There could be a leak and you could be loosing backpressure
    -Off the Jump!!-

    CRASH

  5. #5
    Marshal Double G's Avatar
    Join Date
    May 2008
    Location
    Putting the water on the hot stuff
    Posts
    9,706
    Start simple and check the slipper. When you give it throttle and the flywheel is spinning but the tires are not then you need to find where the disconnect is. So if the flywheel is spinning, how about the clutch bell? Spur gear? Input shaft? Output shafts/center driveshafts? Axle shafts? Go right down the line. Where one part spins and the other does not, you've isolated the problem.
    The Super Derecho

  6. #6
    RC Competitor
    Join Date
    Jun 2011
    Location
    Phoenix
    Posts
    97
    +1 for checking the slipper clutch. Sometimes it's just a matter of needing to tighten that up. Like Double G says, start simple. No need to overhaul the engine if it's not necessary.

    I guess the main question, does the engine sound like it's revving normally? If the engine sounds "normal", it's almost certainly the slipper clutch or the clutch shoes inside the clutch bell. Sound is a big part of troubleshooting. Hear grinding -- it's gears. Engine sounds weak -- then it's a pressure / tuning issue. Engine sounds normal, but power not getting to the wheels -- it's a clutch issue.

    Also, the 2.5 trannys. Don't they have a one way bearing in them? That may be going out I suppose.
    Last edited by skeletorsue; 05-06-2012 at 12:22 PM.

  7. #7
    RC Racer
    Join Date
    Mar 2012
    Posts
    186
    The engine was reving higher then normal on the last tank

  8. #8
    RC Champion
    Join Date
    Mar 2006
    Location
    Pittsburgh
    Posts
    1,900
    The engine is reving higher because there is less stress on the engine. Which means something is slipping I'd do what doubleG said and check down the line from engine to wheels.

    Sent from my ADR6300 using Tapatalk 2
    TRXnot so Newbie21

  9. #9
    RC Champion
    Join Date
    Feb 2012
    Posts
    2,215
    Could be the engine clutch shoes....
    Slipper clutch as said above me!!!!!!!!!
    "I like rc cars"....."WHAT? YOU'RE KIDDING!"

  10. #10
    RC Turnbuckle Jr. Wildman4910's Avatar
    Join Date
    Jun 2009
    Location
    Cocoa Florida
    Posts
    3,945
    Check your flywheel nut, your flywheel may be loose & the nut need tightening.
    Look out for the tree/crunch!

    LiPo? Naw NITRO!!

  11. #11
    RC Racer
    Join Date
    Mar 2012
    Posts
    186
    Thanx , Ill look at it today.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •