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Snowcat Restoration & Modification Projects Forum Major Restorations, Upgrades, and Non-Stock Snowcat Modifications

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  #521  
Old 12-05-2018, 11:00 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

New grade 8 sprocket bolts and lock washers installed with sprockets and spacers. As you can see with the spacers there’s not a lot or room for carrier wear until they hit.

Filled the differential and installed the hyfax.

Tracks could go back on quick but looks like I have some time. Going to swap out some rk wheel and the extra ice breaker on the passenger side.

Found a NOS wheel in the stash along with a good used. Going to put new bearings and seals in. Interesting setup on then NOS seal and spacer. None of the other ones look like this on the cat.
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  #522  
Old 12-06-2018, 12:23 AM
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Default 1973 Tucker Sno Cat 1443 New to Me

Installing the seal ‘backwards’ keeps the water out and also prevents you from blowing the seal out when you over grease it. I’m thinking I did some of each to see if it makes a difference. All of my 1981 Tucker wheels had that spacer setup.
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  #523  
Old 12-06-2018, 02:58 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

So these could be under those flat washers. I haven't pulled a wheel off the carrier yet.
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  #524  
Old 12-09-2018, 01:25 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Pulled off the extra ice breaker and the RK wheel. Front will now be back to matching.

The wheels all have spacers and varying seal configuration. Going to replace some bearings seals reversed and the Tucker washers which keep the snow and debris out.
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  #525  
Old 12-09-2018, 04:33 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Pulled the bearings and seals from the NOS wheel. Although never used it was never grease and has some rust.

New bearings and seals on the way.
Seal National 471429
Bearing Timken LM67048

Other wheel had
Seal Chicago Rawhide 1612
Bearing SKF LM67048/Q

The national seal has a better lip than the C/R.

The seals do install backwards.
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  #526  
Old 12-09-2018, 11:30 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

What were the part numbers for the inner and outter bearings and races and seals?? I have a tucker 1644 would be nice to know the numbers thanks keep up the great work with nice pictures
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Old 12-09-2018, 11:33 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Races are in good shape so did not pull look.

I’ll see if I can figure out.
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  #528  
Old 12-09-2018, 11:59 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

thank you
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  #529  
Old 12-12-2018, 11:50 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Only squared up the front and rear tables tonight on this one. Couldn’t cross any of those part numbers easily. Jean at Track Inc East had the parts and numbers quickly for me thanks!

Fired it off tonight purrs. Needs an exhaust manifold.
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  #530  
Old 12-13-2018, 09:56 AM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Napa BR6 bearing and race for idler wheels
Chicago Rawhide 16128 seals

Two per
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  #531  
Old 12-13-2018, 11:13 AM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Not to hijack the thread, but I'll throw out a couple of thoughts:

When it comes time to replace wheel seals many people go to their local auto parts store or bearing supply company and get seals there. Those seals, made by companies such as CR (Chicago Rawhide, now owned by SKF) and National are usually a double-lip design.

One can also buy seals from Tucker and they're different. Tucker uses a triple-lip design, and the seals themselves use a special rubber compound designed for low temperature applications. They used to be very reasonably priced. I bought a bunch about eight years ago at $2.75 each. Now they're $4.45 per...a 62% increase. Ouch!

I've seen the backwards seal installation technique recommended before, but I think folks are overlooking something in blaming the wheel seals for grease contamination issues.

If you think about the Tucker idler wheel setup (damper wheels, if you have those, are similar), you have a spindle, whose outside diameter is substantially less than the wheel seals inside diameter. Tucker uses short machined steel sleeves called "ring seals". The wheel seal rides on the the OD of the ring seal. Look at the inside of the ring seals pictured in this thread. Here's a pic so you don't have to scroll backwards.


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The inside is just machined steel, and it's designed to slide over the spindle. There is no sealing capability whatsoever between the inside of the ring seal and the spindle, and water, or other contaminants, can fairly easily get in and raise havoc with the bearings. Tucker (correctly) recognized this and came out with a revised ring seal design that incorporates a groove on the ring seal ID for an O-ring. That O-ring makes a seal with the spindle. I don't know when they introduced the redesign, but I suspect many Tucker owners are replacing wheel seals when they aren't the problem at all. If your machine has the original style ring seal design I'd consider machining the groove and adding an O-ring to your existing ring seals, or possibly purchasing new ones from Tucker. Here's a pic of the second generation ring seal.


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  #532  
Old 12-13-2018, 01:41 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Great info and tip. For new spacers for these wheels on the way!

The NOS seal is definitely a triple seal much better design than the replacement one on other wheel.

That part number is what Tucker uses today according to Track Inc east.
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  #533  
Old 12-16-2018, 10:48 AM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Interesting discovery next door.

This use to live at a local tubing hill which I heard closed.

We do have hills in Haverhill so maybe?
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  #534  
Old 12-16-2018, 04:22 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Quote:
Originally Posted by Track Addict View Post
Interesting discovery next door.

This use to live at a local tubing hill which I heard closed.

We do have hills in Haverhill so maybe?
they are known as over passes
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  #535  
Old 12-16-2018, 08:08 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Little fresh air today to while some other sno toys got attention.
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  #536  
Old 12-18-2018, 09:06 AM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Got the spacers. They are just under 10$ per. You need 40 or more depending on the machine.

The most cost effective way is turn a groove in existing using this as a guide and buy some orings if so inclined. Great info from Blackfoot and makes perfect sense.

Evolution must have been seals in backward water intrusion. Then the washers over the seal still water intrusion. Then this which is the fix.

That being said seals in either way. Reverse would have bought just a little more time before the water hit the bearing. Reverse requires a little less grease for the first fill. If you have the washers I think this is preferred method. Also depending on your seal and lip orientation on the replacement you may want to put one way or another.
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