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

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  #461  
Old 10-03-2018, 10:34 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

looks great
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  #462  
Old 10-04-2018, 03:50 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

I've always wondered why the roller was allowed to have direct contact with that aluminum table. You have a pristine one, but almost every other table out there has the massive wear grooves. That being said, I'm betting that if you made more than one, you (or your buddy) would certainly have a market for everyone looking for an economical, long term fix. Hell, I can even think of a place to use one of those . . .
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  #463  
Old 10-04-2018, 04:23 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Have a few tables with inlay steel plates. Most are also worn and one was ripped right out.

Back when you could buy parts none of this mattered. Challenge with the plate is turning the roller to fit and shimming the rear pivot. The front trunion hanger also needs machininf to allow more clearance.

Let me know if and when your cat gets to that point. There will probably be a repair app by then!
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  #464  
Old 10-04-2018, 10:26 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

An alternative to shimming the rear pivot is to install a taller insert and a spacer under the horizontal surface of the trunnion equal to the increased height of the plate/ larger diameter roller.
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  #465  
Old 10-07-2018, 05:54 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Going to take a few steps back on this project to take some better steps forward.

Got a new phone this week and yesterday I noticed I had no voicemails since Tuesday. Reset some things and a number of them came down from the mysterious could. A very important one Drifted across I missed this earlier this week and wish I had not. Thanks in Advance!

I had addressed the trunion pivot forward motion and wear with the bronze bushing. What I did not really address fully was the load above the pivot on the table and that wear surface. My solution was a high load bronze thrust washer. One side it touches is the steel trunion above the pivot and the other side is the aluminum table. Issue with my current design is that unless the thrust washer magically stays glued to the table and doesn't move it will eat into the table over time. Also not a lot of surface area here.

Scott is 100% correct above. What I should have done is installed a taller bushing so top of the bushing was proud of the table creating the wear surface I need. That would wear over time and then replace before it hits the table. Drawback is that you would need to bottom the bushing so next removal in the blind hold with a puller will make next service more difficult.

Alternatively he suggested shimming under the pivot in which case the trunion rides on the bottom of the pivot bore in the table and you could watch the trunion to table gap close and once close service and replace. I like this due to the larger surface wear areas but you still have the potential for thrust washer in the bore to wear into the aluminum. Here I I think you could retainer a bottoms washer to prevent that aluminum wear and add a second one on top.

How about taking the best of all these worlds?
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  #466  
Old 10-07-2018, 06:15 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

New Plan:

1. Remove the bronze busing I just pressed and replace it with a bronze flange bushing. This will eliminate need for a bronze thrust washer and the potential for the thrust washer to turn and wear into the table. A taller busing would do the same thing but the flange will allow me a gap without bottoming for a puller.

2. Shim under the pivot in the table bore with bronze thrust washers.

The grease zerk in the table pivot cup/bore will allow allow greasing of the bronze below the pivot as well as the pivot point for the forward motion. This appears to be a larger surface area than the upper trunion pivot area. If I can get both to bear the weight and use both surfaces even better.

If pulling my newly installed pivot bushing is too difficult I will insert the thrust washer above the table and under the pivot back into the plan. Right now if I add 2 1/8" bronze thrust washers in the bore I get either my 1/8 flange bushing or thrust washer under the upper pivot point with little clearance. In either solution once the upper pivot touches you still should have good service live and an advanced warning before you damage the table ever. At least under my watch.

Next person to service this upgrade will only have to takes off the tie rod, driveshaft, front trunion table holder then jacks up the front and rolls the assembly off. Few off the shelf bushings and washers some basic machining skills and you just got another life with little hassle. Much like the rear now has UHMW blocks for ease of service.

After all this front roller will be turned to compensate for plate and keep geometry all even.

Think this is a good result from the wisdom of many!
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  #467  
Old 10-07-2018, 06:21 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Here is some idea pics.

Last the trunion carrier needs another gusset. One is factory thereis room for another so going to add it.
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  #468  
Old 10-09-2018, 08:14 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Ordered some more parts and paint.

Added a drain plug for the diff. Magnetic plug will replace this one after paint.

Fabed up the additional trunion carrier brace ready for welding.
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  #469  
Old 10-11-2018, 06:28 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Improved flange bushing design compete. Much better solution.

Bronze thrust below the trunion all shimmed. Hope to have my plate beginning next week to finish the roller.

Priming and painting finished pieces begins.

Think I have all the parts and pieces in or on they way.
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  #470  
Old 10-11-2018, 07:32 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

you are getting pretty good at machine work...
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  #471  
Old 10-12-2018, 11:00 AM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Quote:
Originally Posted by Pontoon Princess View Post
you are getting pretty good at machine work...
Totally agree! Great idea, beautifully executed!
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  #472  
Old 10-12-2018, 08:24 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Gusset
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  #473  
Old 10-13-2018, 10:24 AM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Bearing tape my friend and maybe yours!

Took up the trunion wear nicely.

Roller side has more wear than pivot side. Most likely due to roller not touching and carrier riding direct on table.
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  #474  
Old 10-16-2018, 06:12 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Priming some parts.

Only thing noteworthy here is the front axle housing used doubled up hanger brackets where as the rear only used one? Doesn’t seem to be a thread length issue. Tucker wonderment!
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  #475  
Old 10-17-2018, 08:57 AM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Hope that you removed both tie rod ends, cleaned the threads and painted them with anti-seize. Now is the time to do it in the event that one breaks and you have to change out in the bush. Just sayin.
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  #476  
Old 10-17-2018, 12:39 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

Even better is they were already loose and one appears to have been replaced in life.
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  #477  
Old 10-17-2018, 09:10 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

did you remember to bush the spring bolt holes in the fifth wheels, big wear item!
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  #478  
Old 10-17-2018, 10:10 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

I did remember but did not do. Wanted to leave something to keep the three alive. These ones are virgin bore. Figured it will be a good project for the boys in another few decades.

The ones on my 442A were also not worn out after all those years. Seems like some had the bolts freeze in the table and never pivot putting the wear in the hanger brackets.

Little retainer helps also to hold the shank in a nice table bore.
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  #479  
Old 10-18-2018, 12:08 AM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

I noticed in earlier post no. 468, that it looks to these old eyes that there is a crack running north and south on the diff housing beside the oil drain plug. Perhaps this is intentional for chainsaw bar oiling, what do I know.
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  #480  
Old 10-18-2018, 12:41 PM
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Default Re: 1973 Tucker Sno Cat 1443 New to Me

The castings on all 4 of these I have done have this crusty weld slag on top. I grind it clean before painting but does look just like a crack.
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