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Antique Steel Wheel Tractors - Old Iron Lugs and Cleats

Twin City 20-35 Prototype?


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  #51  
Old 02-27-2016, 10:48:48 PM
Mark Schneider Mark Schneider is offline
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Default Re: Twin City 20-35 Prototype?

Now for some observations that I've made concerning some of the differences between the 20-35 prototypes and the production run shortfenders after #3201. We'll start with the front wheels.

1. Front wheel and hub construction on the prototypes.

2. Blueprint drawing of the improved front wheel detailing the "waffled" hub.

3. Blueprint date of 6-22-20

4. Picture of Pat Bayer's 20-35 #3214 showing the improved front wheels.

It would seem unlikely that the prototype front wheel design ever got used on the production run tractors. The blueprint date would suggest a starting date of July-August 1920 for the start of the #3201 production run.
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  #52  
Old 03-06-2016, 01:16:57 AM
Mark Schneider Mark Schneider is offline
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Default Re: Twin City 20-35 Prototype?

I decided to turn the search to the heavyweight tractors to see if the engineering department at MS&M Co. used any of them as a base point when they started with the unit construction concept of the 20-35. It looks like a few items from the 15-30 heavy weight got carried over to the pre-production 20-35's.

The 15-30 was an interesting but probably not very practical design. It was very narrow (5ft 4in.) and with the canopy installed was just over 9 feet high. It was almost twice as tall as it was wide and probably made for some precarious travel on any kind of a sidehill. It was rated as a 4 plow tractor.

The first thing I noticed was the front wheel hubs which could be dead ringers for the ones used on the 20-35 prototypes. The front wheel size isn't too far off at 32"x6" versus 36"x8 1/2" on the Twin Cams. The rear wheels on the 15-30 were 60"x14" which was a close match to the 60"x 16" rears used on the prototypes. Both tractors have the same spoke count front and rear. Also the split block motor concept was carried through to the 20-35 albeit the cylinder jugs were no longer removable and the block casting was strengthened by the elimination of those very generous hand hole plates.
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  #53  
Old 03-06-2016, 12:11:26 PM
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Default Re: Twin City 20-35 Prototype?

That's a tall, skinny tractor for sure! Obviously they carried over the steering wheel too, for many years!
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  #54  
Old 08-18-2016, 12:01:54 AM
Mark Schneider Mark Schneider is offline
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Default Re: Twin City 20-35 Prototype?

Since the last post here I have since acquired a 1922 Twin city 20-35 serial# 3604. It was in non-running condition when I got it and needs a lot of TLC in numerous area. On this one the primary bevel gears needed attention so I removed the LF axle/wheel assembly so that removal of the belt pulley shaft was possible. When the belt pulley was exposed I said myself "Man I've seen that pulley design before...but where?" I searched through my Twin City info and found where I had seen it. The picture of the prototype 20-35 in the 1924 parts book had this same pulley mounted. According to the parts book this lighter duty 2 bolt hub was the first design off the drafting tables for the 20-35 tractor.
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Old 08-18-2016, 11:22:11 AM
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Default Re: Twin City 20-35 Prototype?

Looks like that pulley has never been off since it was installed at the factory.
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Old 09-17-2016, 09:51:21 PM
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Default Re: Twin City 20-35 Prototype?

Hi Mark
Here is the clearer view of the right side of the early 20-35.
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  #57  
Old 09-18-2016, 12:02:01 AM
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Default Re: Twin City 20-35 Prototype?

Post 45 seems to me that they just doctored up a 12-20 drawing to present the 20-35. Going off the other details and size reference points. They may have figured an average farm man may not have critiqued it.
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  #58  
Old 09-21-2016, 12:26:45 AM
Mark Schneider Mark Schneider is offline
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Default Re: Twin City 20-35 Prototype?

Jim...thanks for the illustration. It is clearer than the one on Post #10 and it is in a different layout. Is there a printing date on the publication?
As it stands now my opinion is that if this configuration of the 20-35 was offered for sale to the public it had to have happened prior to the #3200 and later production run. The engine in this one would have a block# of AE1 and is the same as the prototypes only this one uses an simplified intake manifold and is fitted with the stackless AE181 "eyebrow" air cleaner.

Another 20-35 prototype picture discovered for your viewing pleasure.
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  #59  
Old 09-21-2016, 01:35:08 AM
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Default Re: Twin City 20-35 Prototype?

Hi Mark
It mentions the 20-35 as being the latest model produced but no date anywhere on this publication.
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  #60  
Old 09-22-2016, 12:01:38 AM
Mark Schneider Mark Schneider is offline
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Default Re: Twin City 20-35 Prototype?

I've waited a good while for this photo to surface. Here is a photo of a TC 20-35 prototype that gives us some details of the left side of the engine. Note that the water pump is mounted in the middle of the block with the magneto positioned further back similar to the 12-20's. The rear wheels on the tractor are the 16x60's with extensions and it looks like it is pulling 2-3 bottom plows with a tandem hitch.

This picture would seem to lend evidence that the debated 20-35 tractor illustration in the parts book depicts an actual tractor.
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