Forums Forums - Off Topic Forum FUN




Go Back   Forums Forums - Off Topic Forum FUN > Snow Trac ST4, Kristi, Thiokol/LMC, Tucker, Bombardier & Other Snowcat Discussions > Snowcat Repairs, Parts & Problems Forum > THIOKOL/LMC/DMC Technical Issues Forum

THIOKOL/LMC/DMC Technical Issues Forum Technical repair issues & questions for Thiokol/DMC/LMC

Reply
 
Thread Tools Display Modes
  #1  
Old 08-14-2007, 09:50 AM
Snowcat Pat's Avatar
Snowcat Pat Snowcat Pat is offline
Bronze Member
 
Join Date: May 2006
Location: Wallace, Idaho
Posts: 328
Thanks: 177
Thanked 169 Times in 56 Posts
Snowcat Pat is on a distinguished road
Default OC12 Pinion shaft nut torque

OK , I want these OC12s' to last, they are not in production anymore (that I am aware of) so anything that will prolong their life is good for all of us. Lets start with this.

This is important. On most of the OC12's I have rebuilt the Input Pinion Shaft Nut is not tight, and damage has already occurred. Its easy to think it should be adjusted like you would a wheel bearing, but thats not correct. It should be very tight, I can't find it in the manual this morning but somewhere it is spec'ed to be torqued to 275 foot pounds. Not easy to get it that tight, but if it if is not the Pinion Bearing Spacer grinds down fast and the assembly gets looser and the R&P fall out of optimum alignment, all very bad. I make a wrench out of channel iron that fits over the Yoke to hold it while tightening the Nut. Its not a hard thing to make and simplifies the procedure. Don't just tighten it using the gears to hold it.

A simple in-machine test is to try to spin the Seal Spacer (behind the Yoke) with your fingers. If it will, you already have issues, but tighten it up anyway.

I'll have more questions than answers for this section usually, but I wanted to share this, and to get his section going. I also want to encourage discussion and debate (but not insults). Everything I write is IMHO. Thats all from me for now, got to get back to it.


Pat Foster
Wallace Idaho
Reply With Quote
  #2  
Old 08-14-2007, 10:50 AM
Snowcat Operations's Avatar
Snowcat Operations Snowcat Operations is offline
Gold Member
 
Join Date: Dec 2005
Location: NEVADA
Posts: 7,804
Thanks: 32
Thanked 92 Times in 46 Posts
Snowcat Operations is on a distinguished road
Default Re: OC12 Pinion shaft nut torque

Can you post a picture of the Seal Spacer in question?
__________________
EVIL prevails when good men stand aside.
Reply With Quote
  #3  
Old 08-14-2007, 11:05 AM
Snowcat Operations's Avatar
Snowcat Operations Snowcat Operations is offline
Gold Member
 
Join Date: Dec 2005
Location: NEVADA
Posts: 7,804
Thanks: 32
Thanked 92 Times in 46 Posts
Snowcat Operations is on a distinguished road
Default Re: OC12 Pinion shaft nut torque

If I have the correct one in mind then both of mine are very tight. Pictures would be a huge help though. Thanks Pat!
__________________
EVIL prevails when good men stand aside.
Reply With Quote
  #4  
Old 08-15-2007, 07:40 AM
Mainer's Avatar
Mainer Mainer is offline
Boggie likes our museum
 
Join Date: Jan 2007
Posts: 1,180
Thanks: 0
Thanked 4 Times in 4 Posts
Mainer is on a distinguished road
Default Re: OC12 Pinion shaft nut torque

It would be a beautiful thing (tears to the eyes), if someone were to take step-by-step photos of the next diff rebuild that is done (OC12, OC15 or other). Something like how weatherby is doing for his entire end-to-end restoration of his 601.

That would be a fantastic bit of value to everyone on forums given it is the most significantly different and critical piece of kit in any snowcat...ok, barring SnOps special affection ( ) for the "diff-less" dual-shaft trackmaster. :)

__________________
Reply With Quote
  #5  
Old 08-15-2007, 09:35 AM
Snowcat Pat's Avatar
Snowcat Pat Snowcat Pat is offline
Bronze Member
 
Join Date: May 2006
Location: Wallace, Idaho
Posts: 328
Thanks: 177
Thanked 169 Times in 56 Posts
Snowcat Pat is on a distinguished road
Default Re: OC12 Pinion shaft nut torque

Its in the works. I have taken dozens of photos of the rebuilds and mods I make when rebuilding, I'm taking more photos every day. But I am not a computer whiz and I don't own a digital camera. For some months Ive been working on a just such display for my web page. I thought a nice title would be "Inside the OC12". My Historic Wallace Idaho webmaster is quite busy and so am I but we will get it going in the next few months. I am unable to post photos to this site. I only have web based email, 24kbs on a 5 mile long phone wire.
Over time we can discuss here all the potential failure modes and mods that I am familiar with, but have patience. I want others folks with experience to post here too. I'm here to learn so I'm trying to instigate responses from those folks. We are also getting set to restart our business with a new name and mission.

Pat Foster
Wallace Idaho
Reply With Quote
  #6  
Old 09-15-2013, 01:08 AM
Jess Jess is offline
Member
 
Join Date: Dec 2011
Location: Estacada Or
Posts: 40
Thanks: 0
Thanked 0 Times in 0 Posts
Jess is on a distinguished road
Default Re: OC12 Pinion shaft nut torque

im bringing an old thread back to life!
is the torque still 275?
i replaced the seal and the nut was not very tight, but gears look good and no metal chunks in oil after a hard winter workin!
Reply With Quote
  #7  
Old 09-15-2013, 08:15 AM
MNoutdoors's Avatar
MNoutdoors MNoutdoors is offline
Tracked Evolution Central
 
Join Date: Jan 2007
Location: AK.,AZ.,CA.,MN.,MT. Home of all the villes
Posts: 3,590
Thanks: 6
Thanked 1,571 Times in 625 Posts
MNoutdoors is on a distinguished road
Default Re: OC12 Pinion shaft nut torque

Quote:
Originally Posted by Jess View Post
im bringing an old thread back to life!
is the torque still 275?
i replaced the seal and the nut was not very tight, but gears look good and no metal chunks in oil after a hard winter workin!
Jess, here is a link to the manual that I posted on this site some time in the years past. Look at the bottom right corner of the page.

http://www.forumsforums.com/snowcat3.html
__________________
What ever happened to the good old days
Reply With Quote
  #8  
Old 09-23-2013, 03:08 AM
Jess Jess is offline
Member
 
Join Date: Dec 2011
Location: Estacada Or
Posts: 40
Thanks: 0
Thanked 0 Times in 0 Posts
Jess is on a distinguished road
Default Re: OC12 Pinion shaft nut torque

awesome thank you boggie
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
PTO shaft lock broken. Repair or Replace? Melensdad Tools & Tractor Implements Forum 6 12-11-2005 12:17 PM
PTO shaft standards??? Melensdad Tools & Tractor Implements Forum 1 10-18-2005 07:40 AM





All times are GMT -4. The time now is 08:07 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright 2002 - 2018 www.ForumsForums.com