Author Topic: What do you run for a rear axle  (Read 16550 times)

0 Members and 1 Guest are viewing this topic.

Offline 1031

  • Turf Warrior
  • **
  • Posts: 106
  • Karma: 1
  • Gender: Male
    • View Profile
What do you run for a rear axle
« on: April 22, 2007, 01:11:49 am »
Hey Guys,

I am running a 639 Peerless 3 speed. Great tranny.  But tonight on my 2nd race I snapped the new rear 4120 chrome molly axle!  I piece solid.
 It broke just inside the right side of the case about a 1/4 inch inside.
Here I thought this chrome molly was the "stuff" for axles.

Do you all have any better ideas?  Tell me what you run.
 Thanks alot!

1031
Ron Diebold ~ #1031
President Semow Lawn Racers Inc. 2007
VP Semow Lawn Racers Inc. 2006
Modified Track Champion 2006

Offline allen minaker

  • Turf Warrior
  • **
  • Posts: 906
  • Karma: 8
  • Gender: Male
    • View Profile
    • LawnMonkey Racing
Re: What do you run for a rear axle
« Reply #1 on: April 22, 2007, 01:37:00 am »
I would think that if you snapped the axel that you have alot of axel showing out side of the houseing ????
A little trick is to take a long houseing off of a spare or parts transaxel and replace the short housing on the transaxel you plan to run . I have done this and ran the stock axels with no problem , Just have to make sure to support the axel .
LAWNMONKEY RACING
   FX  236
Vice President WILMRA
www.WILMRA.com
http://lawnmonkeyracing.webs.com/

Offline Snowman18

  • Turf Warrior
  • **
  • Posts: 683
  • Karma: 7
  • Gender: Male
    • View Profile
    • BSMRA
Re: What do you run for a rear axle
« Reply #2 on: April 22, 2007, 01:48:41 am »
CroMo fatigues to rapidly, it's not even that great for bicycle frames, good ol' steel works the best for solid rear axle. There's a lot of weight cantilevered off the end bearings, I don't know of any other racing type group aside from quads that don't run wheel bearings on the rear, we of course have axle bearings but they are general closer to the center of the axle than to the center of the rear tires. I myself run a 1" steel axle out back, I know some that run 1 1/4" axles (again steel) solid or hollow . Finally, aluminum is not a good axle material either because of the moment arm that is our axle.
Scott Nelson
#18 (MX/R)
BSBOB(ARMA)
Retired
Bert once told me that" there was a lot of money in racing", he should know he put a lot of it in there.

Offline 1031

  • Turf Warrior
  • **
  • Posts: 106
  • Karma: 1
  • Gender: Male
    • View Profile
Re: What do you run for a rear axle
« Reply #3 on: April 22, 2007, 02:08:14 am »
All right I am learning here but "Good ol' steel"  won't that bend too easy?

I used to weld 2 axels together to get a wider right side Axel.
Put the weld inside the case.
picked up this 600 series and thought 1 piece chrome molly would last all year or more.

please give me what kind of "good ol' steel" I need to work with.

Thanks for the replies so far!

1031
Ron Diebold ~ #1031
President Semow Lawn Racers Inc. 2007
VP Semow Lawn Racers Inc. 2006
Modified Track Champion 2006

Offline Snowman18

  • Turf Warrior
  • **
  • Posts: 683
  • Karma: 7
  • Gender: Male
    • View Profile
    • BSMRA
Re: What do you run for a rear axle
« Reply #4 on: April 22, 2007, 02:16:16 am »
Unfortunately I cannot give you the physical properties of the steel axles, I don't have that information at hand.  :dunno: I think it was Grainger that sells 3/4" steel axles with the 1/4" keyway, and "monkey" is right get the longer axle housings for that 600.  :thumbup:
Scott Nelson
#18 (MX/R)
BSBOB(ARMA)
Retired
Bert once told me that" there was a lot of money in racing", he should know he put a lot of it in there.

Offline 1031

  • Turf Warrior
  • **
  • Posts: 106
  • Karma: 1
  • Gender: Male
    • View Profile
Re: What do you run for a rear axle
« Reply #5 on: April 22, 2007, 02:21:51 am »
Thanks Snowman,

Any info that I get from everyone is Great.
thanks for your replys

just looking for the perfect material to build with.

1031
Ron Diebold ~ #1031
President Semow Lawn Racers Inc. 2007
VP Semow Lawn Racers Inc. 2006
Modified Track Champion 2006

Offline Shrek

  • Turf Warrior
  • **
  • Posts: 504
  • Karma: -3
    • View Profile
Re: What do you run for a rear axle
« Reply #6 on: April 22, 2007, 02:25:30 am »
Unfortunately I cannot give you the physical properties of the steel axles, I don't have that information at hand.  :dunno: I think it was Grainger that sells 3/4" steel axles with the 1/4" keyway, and "monkey" is right get the longer axle housings for that 600.  :thumbup:
So basically you have to just change cases around? :confused:
I AM BANNED

Offline Snowman18

  • Turf Warrior
  • **
  • Posts: 683
  • Karma: 7
  • Gender: Male
    • View Profile
    • BSMRA
Re: What do you run for a rear axle
« Reply #7 on: April 22, 2007, 02:33:25 am »
No the axle housing extensions are bolt on, one side is longer than the other, find another long one and bolt it in place of the short one, and "wallah" you now have effectively moved the axle bearing several inches closer to the center line of the tire.
Scott Nelson
#18 (MX/R)
BSBOB(ARMA)
Retired
Bert once told me that" there was a lot of money in racing", he should know he put a lot of it in there.

tractorman

  • Guest
Re: What do you run for a rear axle
« Reply #8 on: April 22, 2007, 07:17:28 am »
For that steel axle go to bmikarts.com they sell them for $20. And another option is acmemowersports he sells them for they are a little more exspensive.

Offline allen minaker

  • Turf Warrior
  • **
  • Posts: 906
  • Karma: 8
  • Gender: Male
    • View Profile
    • LawnMonkey Racing
Re: What do you run for a rear axle
« Reply #9 on: April 22, 2007, 08:37:59 am »
Hey 1030 ,

I have never had a problem with the axel breaking , But like I said before I would make sure to support the axel as far out of the transaxel it's self as possiable .
On the mower that I'm working on now there is less than a couple of inches of axel that is showing after I put the long housing on both sides .
Most of that axel that you do see is on the side without the break rotor .
I don't think that your going to break an axel buy twisting it so your just going to have to make sure it doesn't flex and break .
Another thing is to make sure that the bearings are good in the housing so it doesn't heat up the axel on a bad bearing - That's almost what  sounds like happened to your's .I maybe wrong .
LAWNMONKEY RACING
   FX  236
Vice President WILMRA
www.WILMRA.com
http://lawnmonkeyracing.webs.com/

Offline mowdak1

  • Highly Mowtivated
  • ****
  • Posts: 4349
  • Karma: 73
    • View Profile
    • North Dakota Lawn Mower Racing Association
Re: What do you run for a rear axle
« Reply #10 on: April 22, 2007, 10:25:46 am »
All right I am learning here but "Good ol' steel"  won't that bend too easy?



Yep.... That's why the majority of folks that race seriously run chrome-moly axles. If you're breaking chrome moly, you're going to bend steel, guaranteed.


I used to weld 2 axels together to get a wider right side Axel.


In that you suggest this is only the 2nd race on it, in your first post... Metal fatigue is NOT an issue here! It would seem you have an engineering problem there somewhere dude. Can you get us a picture of the setup?? Given the above statement, I have to agree with Allen, sounds to me like you have too much axle out beyond your support, or issues with the bearing in the end of the axle tube.

Offline 1031

  • Turf Warrior
  • **
  • Posts: 106
  • Karma: 1
  • Gender: Male
    • View Profile
Re: What do you run for a rear axle
« Reply #11 on: April 22, 2007, 11:33:07 am »
Agree  most likely too much axle outside the housing.

Now I will move the tire closer to the housing and check the bearing.
I did check the bearing and repack it when I put it together.  also installed new lube.

I will move the left tire and right tire now so that I can get my Maximum width but not all my width on just the right.

Thanks for all your help guys!
Mow on mowing on!

1031
Ron Diebold ~ #1031
President Semow Lawn Racers Inc. 2007
VP Semow Lawn Racers Inc. 2006
Modified Track Champion 2006

Offline mowdak1

  • Highly Mowtivated
  • ****
  • Posts: 4349
  • Karma: 73
    • View Profile
    • North Dakota Lawn Mower Racing Association
Re: What do you run for a rear axle
« Reply #12 on: April 22, 2007, 12:46:22 pm »
Given set up you're suggesting Ronal, I'd guarantee it. At 3/4" or even 1" it's marginal in this application anyhow given weight of the machine and rider, under race conditions, so yeah you're going to see a broken axle or two, that's almost a given, As I suspect you're set up, you're putting way too much stress on it. 

Offline 1031

  • Turf Warrior
  • **
  • Posts: 106
  • Karma: 1
  • Gender: Male
    • View Profile
Re: What do you run for a rear axle
« Reply #13 on: April 22, 2007, 09:16:08 pm »
This was during my build.

I need to stay with the 3/4 because of the tranny.
I have a tube covering the axle from the rim center up to the tranny. then the brake attached to the tube.

In the picture I was not finished but you get the idea.

Just thought I would include a picture. Because a picture is worth a thousand words but you know a picture takes more room on your hard drive  :P

1031
Ron Diebold ~ #1031
President Semow Lawn Racers Inc. 2007
VP Semow Lawn Racers Inc. 2006
Modified Track Champion 2006

Offline allen minaker

  • Turf Warrior
  • **
  • Posts: 906
  • Karma: 8
  • Gender: Male
    • View Profile
    • LawnMonkey Racing
Re: What do you run for a rear axle
« Reply #14 on: April 22, 2007, 11:02:24 pm »
If I understand you right you have the mower offset ??? the axel is out farther on the right than the left , if that's the case Your going to have to make a longer housing to support the axel that is taking all the weight on it and then your still probably going to have problems .
 
LAWNMONKEY RACING
   FX  236
Vice President WILMRA
www.WILMRA.com
http://lawnmonkeyracing.webs.com/

 

anything