Re: Re: Re: Re: Re: What's Unique About '39 H?

Posted by Guy Fay on January 04, 2000 at 18:39:24 from (169.207.109.30):

In Reply to: Re: Re: Re: Re: What's Unique About '39 H? posted by justin on January 04, 2000 at 10:38:32:

1. Parts books cover only a small amount of actual changes. I did a count of changes as they were authorized (actual changes take place 1-6 months later, depending on urgency. A limited amount of information is available as far as actual dates changes occured, unfortunatly, but from what there was, no pattern could be seen).
H & M Changes Fiscal year 1940 (1940 serial numbers)
November '39 16
December '39 8
January '40 7 (Both December and January saw the release of -4 and -6 tractors- the engineers were busy!)
February '40 15
March '40 21
April '40 19
May '40 11 (O series tractors being released)
June '40 12
July '40 16
August '40 7
Spetember '40 17
October '40 18.

2. The information came from a IH product change notice. The paragraph in the book was admittedly poorly worded. The change was AUTHORIZED November 3, 1939. However, even if they did the change the next day, the tractor would have been a 1940 serial number, as the 1940 serial production numbers started November 1, 1939. In actuality, the change probably occured in December of 39 or January of 1940.

3. The original wide fronts were approved in June 1940, and thus would have been in the parts books, which were probably put together about this time. Hoever, the product change notices for the M were amended by a later change in November, which changed the widefronts to better match the older F-20 stuff to reduce tool cost. The original change notices said that the attachment would become current with the ammendment. The ammendment did not take effect until January 1940: the notice is very clear. The H product notice, also originally approved in June, 1939, did not become efective until the same date as the M ammendment.

The attachments WERE available as a field kit, and obviously could be ordered from the start of production- they just were not available until that point. If the tractor was ordered from the factory with wide front, it could well have been delivered later.

The very H with the 5?? serial number should be looked at pretty closely. Does the serial number stamped in the front axle look like it's been there for awhile, or is a later anti-theft thing? I wonder if it is a preproduction front axle- a lot of experimentals and preproductions had various parts stamped with the serial number of the tractor it was intended for.

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