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Antique Steel Wheel Tractors - Old Iron Lugs and Cleats

Twin City 20-35 "Canadian"


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  #241  
Old 12-22-2018, 02:15:07 PM
Mark Schneider Mark Schneider is offline
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Default Re: Twin City 20-35 "Canadian"

Duey...The arbor speed on the Ames is quite slow and I made multiple passes as the drive belt set up will slip if the cut is too aggressive. About 50 thou a pass worked well...when I finished the shaft was barely warm.
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  #242  
Old 12-23-2018, 01:05:52 AM
Duey C Duey C is offline
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Default Re: Twin City 20-35 "Canadian"

Very cool. I was stunned at the 50 thou per pass cuts but I get it better now. : - )
Have you fitted it together?
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  #243  
Old 12-27-2018, 11:06:35 PM
Mark Schneider Mark Schneider is offline
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Default Re: Twin City 20-35 "Canadian"

Working on setting up the primary bevel gears.

1. For those who haven't been exposed this is the classic Hyatt bearing set up. This was the cutting edge of bearing technology in the teens and twenties. The large roller takes up the side load while the radial ball bearing handles the end thrust. This was a big improvement over babbitt and straight roller bearings. When the Timken tapered roller bearing was introduced the bearing quills could be preloaded for zero end play and this obsoleted the Hyatt design.

2. As is my tendency I replaced the felt wiper on the input shaft with a modern lip seal.

3. The Hyatt bearing system uses the tendency of gearsets to push each other apart to take the slack out of the bearing quill... but in one direction only. If the shaft is pushed the opposite direction it simply comes out of the quill. I made this collar and set screw to keep the assembly together on the numerous trips on and off to set up the gear tooth depth.

4. There is another Hyatt bearing assembly in this quill for the belt pulley shaft. The end thrust from the driven bevel gear is absorbed here. The gearset backlash is adjusted by paper gaskets between the quill and the case. The backlash can only be approximated at this time as the input shaft has to be supported by the flywheel pilot bearing before the final check is made.
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  #244  
Old 12-30-2018, 09:14:38 AM
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Eric Best Eric Best is offline
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Default Re: Twin City 20-35 "Canadian"

All of my Hyatt bearings on my 20-35 were pretty tired. I made sleeves and spacers and except for the differential and outer ends of the rear axle, all hyatt bearings have been replaced with ball bearings. Smooth as glass now.
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  #245  
Old 12-30-2018, 05:23:22 PM
Mark Schneider Mark Schneider is offline
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Default Re: Twin City 20-35 "Canadian"

Eric...Did you retain the ball thrust bearings on the input and belt pulley shafts or are you letting the new ball bearings absorb the end thrust by themselves?
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