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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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