[Farmall] Cub experts

[n9ads at juno.com]

Carl,

If you go back to pages 6 & 7, I think you will find the IH system works a bit differently than what you are accustomed to.  An R22 might be only the second change to this assembly, at most it could be the 10th revision.

How?  As an assembly, the part would begin with an R11 suffix (R1 thru 9 were reserved for single piece parts and 10 not used).  A change in the major component of this assembly would make it R21, followed by a change in a minor part making it R22.  There may or may not have been changes in the minor parts before the R21 came along which would have been R12 thru R19 and these 8 revisions would have been the maximum number that could have been accommodated.  I don't know how the system would have handled a necessary 9th revision in the minor parts--it's not spelled out.

A part could not go from an R11 thru R89 number to an R91, at least not in theory.  There were different classes of parts, the lower numbers being an assembly with one major component and the R91s (for some reason, there was no R90)were considered assemblies of several major parts.  

However, in practice, by the 1960s, it appears everything was considered a major assembly and only R91 and up suffixes were used, at least on the truck side of the business.  Their example in the 1945 book of a cylinder head 359862R11 became a 215592R93 for a V-304 head with valves (which seems to indicate that at some time the base numbers were purged and reused since the V-304 head would have been assigned its number in the late 1950s).  This allowed for only 8 revisions before a new base part number had to be assigned.

Perhaps more than you ever wanted to know about the IH part numbering system!

Howard

---------- Original Message ----------
From: szabelsk at gdls.com
To: Farmall/IHC mailing list <farmall at lists.antique-tractor.com>
Subject: Re: [Farmall] Cub experts
Date: Sat, 30 Jan 2010 13:09:04 -0500

By the way, I took a look at the pages that were provided addressing the designation. It pretty much follows what we've always seen in the older army drawings, with the exception of the two digits after the R. If we saw R22, it meant 22nd revision, not 21st. That's why I guessed R92 was the 92nd revision even though I can't ever remember seeing one that high before.
 

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