I just got done making a new pump drive setup on my 3414.
As to your's - it all depends on the serial number and which pump it has.
Early 3414 has a pump with a round shaft and single key.
Later 3414 has a 7/8" X 13 splined shaft just like many Deere, Fords, Cases, etc. use.
On mine - the pump had the 7/8" X 13 splined shaft. Then a 7/8" X 13 splined coupler that you can buy on this Website as a Ford part.
From that coupler - the shaft is 7/8" X 13 splined on one end - BUT tapers down and is only 3/4" splined on the other where it connnects to the drive plate on the crank-pulley.
If your coupler is bad, it's likely the shaft and drive-plate on the crank pulley is also bad. I adapted all new parts that I bought here. All for a Ford loader. New rubber-cushioned drive plate with a 7/8" X 13 hole instead of 3/4". New 7/8" splined shaft, new 7/8" splined coupler.
If ALL you want is a coupler - you can buy here under Ford. 7/8" X 13 internal splines.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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