Register and gain access to Discussions, Reviews, Tech Tips, How to Articles, and much more - on the largest Arrma RC community for RC enthusiasts that covers all aspects of the Arrma-RC brand!

Register Today It's free! This box will disappear once registered!

Kraton Gear Mesh Busting Pinion

Discussion in 'Kraton' started by Success LiPo, Jul 9, 2017.

  1. Success LiPo

    Success LiPo Well-Known Member

    Joined:
    Jan 14, 2017
    Messages:
    40
    Likes Received:
    1
    Arrma RC's:
    Kraton
    Ok so after busting a million Pinion Gears, I decided to check the center diff and it seems that there is a lot of play between the bearings where it spins. The one bearing is housed in the red aluminum but the other is in a very flexible black plastic situation.
    Question 1: I'm wondering if there is an upgrade for this plastic housing or if it is important that there be some flex.

    Question 2: I will be installing a new diff and bearings and I am wondering how to "shim" a kraton Diff. From what I hear, that's a thing and can prolong the life.

    Question 3: Does the center diff always seem a little loose and did I possible over react by thinking this was the cause of my pinon shredding issue. It would seem to me that the spur gear should not wiggle side to side at all
     
  2. Ole Fart51

    Ole Fart51 Well-Known Member

    Joined:
    Jul 7, 2016
    Messages:
    414
    Likes Received:
    328
    Location:
    Louisiana
    Arrma RC's:
    Kraton, Nero, Outcast, Talion
    Hot racing makes an aluminum center diff mount. I have them in all my Arrmas. You are correct, there shouldn't be any play in center diff.
     
  3. disturbedfuel15

    disturbedfuel15 Geek Extraordinaire!
    Premium Member

    Joined:
    Jun 24, 2017
    Messages:
    91
    Likes Received:
    42
    Location:
    MI
    Arrma RC's:
    Kraton
    Answer 1: Some people have noticed the aluminum diff mount causing more problems than it is worth, but some people have installed it and been happy. Search "aluminum center diff mount" and you will find the answers you are looking for. I decided to leave the plastic one as it is not causing any issues for me.

    Answer 2:


    Answer 3: The spur gear should not wiggle side to side at all
     
  4. Crash

    Crash Well-Known Member

    Joined:
    May 24, 2017
    Messages:
    217
    Likes Received:
    133
    Location:
    Saturn
    Arrma RC's:
    Kraton
    I use HR diff mount with fast eddie bearings. Using 6s 14t. The only issue i have had are the 4 screws holding the center diff together coming loose. Which i will be getting HR diff carrier to fix.
     
    #4 Crash, Jul 10, 2017
    Last edited: Jul 10, 2017
  5. dpricenator

    dpricenator Premium Member!
    Premium Member ArrmaForum Fan Excellence Award

    Joined:
    Oct 25, 2016
    Messages:
    1,167
    Likes Received:
    956
    Arrma RC's:
    Kraton
    I had an issue with the HR Center Dif Mount, but it WAS MY FALUT. I did not properly seat the bearing, so the bearing blew up on me. Then I go new bearings, and did it the right way. No problems since.
     
  6. Success LiPo

    Success LiPo Well-Known Member

    Joined:
    Jan 14, 2017
    Messages:
    40
    Likes Received:
    1
    Arrma RC's:
    Kraton
    thanks so much everyone!
     
  7. MeesterC

    MeesterC Premium Member!
    Premium Member ArrmaForum Fan

    Joined:
    Apr 3, 2017
    Messages:
    257
    Likes Received:
    122
    Location:
    Georgia
    Arrma RC's:
    Kraton, Senton
    If you don't have the proper mesh between the spur gear and the pinion things like this will happen, ask me how I know......lol. I use the paper method to set mine and it works great, not a problem yet. I take a piece of notebook paper and cut a strip about a quarter inch wide and about an inch and a half long. Place it in between the pinion and spur, then push the pinion snug into the spur and tighten down motor. Spin spur to remove paper and you should have the proper mesh. Hope this helps.
     
    WoodiE likes this.
  8. Dennenr

    Dennenr Active Member

    Joined:
    Jan 18, 2017
    Messages:
    3
    Likes Received:
    0
    Arrma RC's:
    Senton
    I had a bad bearing on the motor shaft outer bearing was toast had a lot of play . Replaced and never had another problem .
     
  9. Success LiPo

    Success LiPo Well-Known Member

    Joined:
    Jan 14, 2017
    Messages:
    40
    Likes Received:
    1
    Arrma RC's:
    Kraton
    Yeah I'm starting to think my motor bearing might be shot. I was gonna buy a whole new motor but how do I find a bearing? I already bought a replacement center diff and spur from a hobbyshop that just took it out of a new Kraton. I though maybe the spur was the issue because it was wiggling a bit.
     
  10. RyanDennen

    RyanDennen Well-Known Member

    Joined:
    May 12, 2017
    Messages:
    4
    Likes Received:
    2
    Location:
    Cape cod
    Arrma RC's:
    Granite, Kraton, Senton
    I removed bearing and used the numbers off or to order a new set . Arrma does not have them available . I have had no trouble since I had side to side shaft movement before, now it is nice and tight . This is what I used so far so good.

    IMG_1133.PNG
     
    Voltron7 likes this.
  • Welcome to Arrma Forum

    Arrma Forum is a Arrma RC fan site that was started to give Arrma RC enthusiasts a place to come together and discuss and share their experiences with the entire Arrma-RC product line, such as the Arrma Kraton, Arrma Talion, and Arrma Granite.

    We welcome all Arrma RC enthusiasts, both new and old, racers and bashers that share a common goal - a willingness to help and learn.
  • Disclaimer