Thiokol 601

[crafttree]

The fun begins? Got all the wheels off on one side and all the bearings were in good shape, that was the good news. It did not take long to see that the bushing was out in the rear suspension arm, only one missing, can a new bushing be made and pressed in or do I need to find another arm?
The manual says that all four wheels are connected to one large central spring. Looking at the photos there are what looks like two tubes with springs in them Right? Both rear cylinders in the suspension look like what ever was functioning inside is long since worn out. Do both tubes have springs in them or is the rear one some kind of shock? Am I looking at replacing this part of the suspension or rebuilding?
Hopefully you guys have some answers or suggestions for me.
Looking closer underneth I could see the whole chassis has been lifted so the axle will clear the rear frame cross member.

 

[Mainer]

Welcome to the world of the 4T.
I think this will serve as the first detailed 4T suspension 'redo' so we're all going to take note...just rip it all open and dig in there.
Worst case scenario, the machine has enough other mods... you can yank out all that suspension and drop in spryte axles ...see posts by tomelroy who bought one already mod'd with spryte axles and tracks.

 

[crafttree]

Into the oc-15 rear end today, looks brand new in there including the brake bands. The slave cylinders are leaking so I need to see where to go to get them rebuilt or purchase new.
There is a bushing or rubber gromet in the case where the shaft goes thru, do these need to be replaced? The shafts were pitted a little looks like some new ones are in order.

 

[crafttree]

These are the slave cylinders that were on the oc-15

 

[dlmorindds]

Here is a picture of the slave internal components

View attachment L537_b (1).pdf

 

[weatherby]

Into the oc-15 rear end today, looks brand new in there including the brake bands. The slave cylinders are leaking so I need to see where to go to get them rebuilt or purchase new.
There is a bushing or rubber gromet in the case where the shaft goes thru, do these need to be replaced? The shafts were pitted a little looks like some new ones are in order.

Those seals that the shafts go through can and should be replaced, they are inexpensive. If your shafts are pitted, you should look into getting new ones, or your new seals will still probably leak. I made my new shafts out of stainless rod.

 

[weatherby]

Here is a pic of the new shaft next to the original.

 

[dlmorindds]

These are the slave cylinders that were on the oc-15

Dick--this Enerpac distributor is in the town where I work. These buggers are pricey Give then a call to see if they have slave rebuild kits

http://www.hagemeyerna.com/ProductC...3db8d&bc=e3efbf4a-d3fe-4270-9828-8334c65f7d46

 

[crafttree]

Brake fluid was used in the brake system on my machine. I was reading about enerpac cylinders and they say to use only hydrolic fluid. What is best to use in the oc-15 brake steer system. I have heard mention of using atf, brake fluid or hydraulic fluid. Any opinions? Advantages of one over another?

 

[Snowtrac Nome]

Brake fluid was used in the brake system on my machine. I was reading about enerpac cylinders and they say to use only hydrolic fluid. What is best to use in the oc-15 brake steer system. I have heard mention of using atf, brake fluid or hydraulic fluid. Any opinions? Advantages of one over another?

the thiokol guys would kow best but i would guess that you would want to use something like 5606 aviation hydraulic oil

 

[crafttree]

I got all the new parts and have everything back together. Putting the tracks back together today. How does one tell what the proper track tension should be on 601 tracks?

 

[Snowcat Operations]

When you turn and they dont fall off...... OK just joking. I believe MAINER would be the man to answer this question.

 

[crafttree]

I finally got the spare track that came with the 4t10/601. The belts look new and the grousers are in pretty good shape too. The deal keeps getting better.
My partners son works for NASA and recognized an airforce # on the ID tag. He said with that number he can look up the history of this machine, where its been etc. Has anyone heard of being able to do this? If its possible, it sure would be interesting to know where that old girl has been.

I also got 4 extra 4t10 manuals that came with it.

 

[MAD]

Barber 1981 I am a new owner as well and in Masonville co Where will you run the 601? Maybe we can go for a trip together. I would like to see your progress on the new purchase. Enjoy.

 

[crafttree]

I am in eastern oregon, might be a bit of a stretch for getting together for a ride. No one in my area owns a snocat that I know of so it looks like solo trips for me. I imagine once the word gets out I will have a few folks that x country ski that will want to get into the back country for some sking though. I got lucky with the purchase of this machine, it was a fairly easy restoration job to get it ready for the snow.