Snowcat Pat
Active member
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
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