DB means B execution of two plunger D pump with .920 rotor, G-mechanical flyweight governor, V= vertical mount, F= flange mount, C= clockwise, CC= counter clockwise rotation, 4 means four cylinders, 29 means .290 plunger diameter, next number is a spec number, letters are accessory code. AF is on fixed phase, no advance pumps, AE is on pumps like IH 460,560, and 660 with light load advance, AJ is on pumps equipped with speed advance. AL is seen on speed advance pumps with electric stop solenoid. Timing always needs to be checked per the service manual, or spec sheet may have it too but not always. JD 3010 and 4010 used AF, no advance pumps from factory, but a field update to AJ speed advance for better starting came out later. A different flywheel timing used for the AJ pumps. DC and JDC pumps have four plungers, DM pumps can have two or four depending on fuel delivery needed.
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Today's Featured Article - The Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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