Transaxle serial # question

[Chris G 3,296]

I started tearing down my 401 today and was kinda curious about the serial tag on the transaxle. I never have seen one with a % sign in the serial number tag. Just wondering if anyone else has came across this and if so what's the breakdown of the tag numbers.

Edited February 17, 2018 by Chris G

[953 nut 55,854]

           I don't know but bet @stevasaurus will know.

[stevasaurus 22,872]

It is not a serial number...it is a casting date. 

D13%1 equates to  D = 4th month = April.   13 is the day.    the 1 after the % = the year  1961

So your transmission case halves were cast on April 13, 1961. 

   Note they did not use the letter "I', they skipped it...so "J" would be September

[Chris G 3,296]

Well thank you for the information. I always find something to make me curious on these old tractors.

[BOB ELLISON 2,981]

@stevasaurus you need to start writing a book on what you know about these machines. After your gone all that knowledge will be lost and we'll have to guess what it all means. Thank you for all the help you give us . I for one am great full for all the knowledge you pass on to us.

[953 nut 55,854]

3 hours ago, stevasaurus said:

It is not a serial number...it is a casting date. 

D13%1 equates to  D = 4th month = April.   13 is the day.    the 1 after the % = the year  1961

So your transmission case halves were cast on April 13, 1961. 

   Note they did not use the letter "I', they skipped it...so "J" would be September

             I knew Steve would have the answer!