1938 John Deere B

I have seen posted on here in the past a procedure for adjusting the throttle like pushing the throttle lever all the way forward and the throttle rod should be 1/2 hole longer with the carb buttlefly held all the way Open? When I try this procedure my rod comes up short by quite a bit. Please advise what I am doing wrong. Thanks

1/2 hole short for proper throttle rod adjustment.

Mark, Thanks for the reply. What should I do since mine comes up way short like 1 inch?

"[b:654c4848f0][i:654c4848f0]<font color="#6699ff">What should I do since mine comes up way short like 1 inch?[/i:654c4848f0][/b:654c4848f0]</font>"

Take a look at the parts diagram below.



Note the throttle rod (Key 4), 1/4 nut (Key 5), throttle rod end (Key 6), and governor arm (Key 23).

Reviewed the [b:654c4848f0]SERVICE MANUAL ON THE JOHN DEERE B TRACTOR SM2004[/b:654c4848f0] under the [b:654c4848f0][i:654c4848f0]Control Linkage[/i:654c4848f0][/b:654c4848f0] topic and [i:654c4848f0]Throttle Control Rod Adjustment[/i:654c4848f0] paragraph on page 110-10-3.

"[b:654c4848f0][i:654c4848f0]If throttle control rod does not adequately regulate the engine speed it may be adjusted. Note that the rod is threaded at the end which is connected to the governor arm and secured with a jam nut. To adjust rod length, disconnect rod from governor lever arm and loosen jam nut. Move speed control lever to the wide open position. Set throttle disk in wide open position. Lengthen or shorten rod end until the rod is 1/2 hole short. Place into position and lock jam nut.[/i:654c4848f0][/b:654c4848f0]"

Take a look at the photo below of "Uncle Earl" our 39B.



Note the distance between the governor arm and speed change spring is approximately 1/8 inch.

Take a look at the photos below of the choke levers on "Uncle Earl" our 39B and "John B" our 43B.







Hope this helps.