Go Back   oOple.com Forums > Car Talk > Schumacher

Reply
 
Thread Tools Display Modes
  #1  
Old 25-08-2017
russmcc77 russmcc77 is offline
Member
 
Join Date: Sep 2016
Posts: 37
Default KC ball diff loosening

Has anyone experienced their ball diff loosening? It did it with me straight out of the box. I've removed it and rebuilt it but the same thing happened! Any ideas or advice would be appreciated.
Reply With Quote
  #2  
Old 25-08-2017
Dombrasky's Avatar
Dombrasky Dombrasky is offline
Senior Member
 
Join Date: Oct 2010
Location: southwest
Posts: 372
Default

have you bed it in...as they need tightening after first few runs
__________________
~Rick Evans~
~LRP~shark st ft~lwb~
~Carisma GT14B pro~
~Schumacher KF2~
~Schumacher Atom~
~BSR Basher-RallyX~
~Ascociated RC8.2e RallyX~
~TeamC T8EV3 RallyX~
phat bodies
worm-racing
http://www.mendiprcraceway.co.uk
Reply With Quote
  #3  
Old 25-08-2017
russmcc77 russmcc77 is offline
Member
 
Join Date: Sep 2016
Posts: 37
Default

Ah no, think I missed that step. Thanks for the reply.
Reply With Quote
  #4  
Old 25-08-2017
mark christopher's Avatar
mark christopher mark christopher is offline
Spends too long on oOple ...
 
Join Date: Jan 2007
Location: haxey, doncaster
Posts: 7,787
Send a message via MSN to mark christopher
Default

I allways set mine too tight from a rebuild and they readjust, you are locking the grub screw onto the bolt after rebuild?
__________________
MBModels - Schumacher Racing - Vapextech.co.uk - MRT - Savox - SMD
Reply With Quote
  #5  
Old 26-08-2017
russmcc77 russmcc77 is offline
Member
 
Join Date: Sep 2016
Posts: 37
Default

I'm sure I did lock it in after the rebuild. I think I'm going to rebuild it again just to make sure that's done, then I'll run it in and check it again.
Reply With Quote
  #6  
Old 28-08-2017
Allan1875 Allan1875 is offline
Senior Member
 
Join Date: Nov 2010
Location: Scotland
Posts: 609
Default

I've personally not had any issues and that's even without fully running it in.

Just make sure the locking grub screw is in place.
__________________
Ardgay Models
Schumacher
CORE-RC
Hobbywing
Mark One Designs
Reply With Quote
  #7  
Old 22-09-2017
Shuntfield Shuntfield is offline
Member
 
Join Date: Nov 2015
Location: Newport South Wales
Posts: 40
Default

Its not the same diff but this video explains how to build Schumacher Ball diffs pretty well.



What I have found that in the area when you are tightening a few turns at a time, I use my Bosch iXO cordless screwdriver to bed the balls in with a about 10-15 seconds each time, then when the diff is fully tight with all springs compressed, then back off 1/4 of a turn (it says 1/8th in the video anywhere between will suffice) and then put a cone point grub screw in the other side.

Then when the grub screw is up against the end of the diff screw, against it but not very tight at this point, tighten the main screw down onto it, I normally use a spanner in the slots of the outrider to hold the other side.

Other tips include making sure that you have the Small Race Washer in the end of the thrust assembly correct, if you have the large one in the wrong place it will bind against the outrider causing the diff to come undone, I have seen this when rebuilding other diffs.

Some people have been tempted to put thread lock on the screw, I personally wouldn't do this, the locking of the main screw with the cone point grub screw is sufficient enough.

My KD Diff initially I made some mistakes, however I have rebuilt many diffs, now and confidently say that they do not come undone and perform well, and ultimately are the same each time.

Hope this helps
Reply With Quote
  #8  
Old 22-09-2017
cjm_2008's Avatar
cjm_2008 cjm_2008 is offline
Senior Member
 
Join Date: Jun 2008
Posts: 889
Default

the ball diff in the KD has been a nightmare for me and many drivers I race with.

It doesn't help that the diff plates are made of what appears to be a very soft steel. If someone could recommend an oil for the gear diff which matches the consistency of the ball diff, that would be great!

It wouldn't be so bad if Schumacher had engineered the gearbox casings to open at the rear, allowing access without dismantling half the car....

Last edited by cjm_2008; 22-09-2017 at 12:46 PM.
Reply With Quote
  #9  
Old 23-09-2017
Shuntfield Shuntfield is offline
Member
 
Join Date: Nov 2015
Location: Newport South Wales
Posts: 40
Default

From what I understand there are some harder plates in the pipeline, after a few runs, the current ones wear quite significantly, and do go "scratchy"

I don't know if it works as well with the KC, but if you take 2 of the gears out of the diff, it will act similar to a Ball Diff
Reply With Quote
  #10  
Old 23-09-2017
cjm_2008's Avatar
cjm_2008 cjm_2008 is offline
Senior Member
 
Join Date: Jun 2008
Posts: 889
Default

Quote:
Originally Posted by Shuntfield View Post
From what I understand there are some harder plates in the pipeline, after a few runs, the current ones wear quite significantly, and do go "scratchy"

I don't know if it works as well with the KC, but if you take 2 of the gears out of the diff, it will act similar to a Ball Diff
I can get a KD ball diff feel from a gear diff by removing all the gears!
Reply With Quote
  #11  
Old 25-09-2017
chris24jt chris24jt is offline
Member
 
Join Date: Nov 2013
Posts: 91
Default

what oil do you run when you remove the gears - or does this not matter and just run it empty?
Reply With Quote
  #12  
Old 27-09-2017
Shuntfield Shuntfield is offline
Member
 
Join Date: Nov 2015
Location: Newport South Wales
Posts: 40
Default

I haven't run without gears, I generally use a ball diff, however, I think you just use the oil that you would normally use.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 01:46 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
oOple.com