1968 John Deere JD400 has throttle issue

[Oldchevyguy]

The throttle has been getting stuck at idle. Not sure exactly how the governor functions in relation to the linkage but for a while I couldn’t throttle up from the handle but if you moved the linkage at the injection pump it would be fine for a few days and then it would get stuck again. The other day I couldn’t get it to throttle up at all. So long story shorter I took it apart and found that there’s a rack and pinion set up that pushes a rod in and out of the injection pump and controls the throttle position. The teeth on the rack were worn and damaged. I was able to find a John Deere part number T31122 Rack is the description. Does anyone know where to find a replacement for this. Not finding anything on the internet. There’s like a ton of other equipment that uses the same part but I guess because of age it may be obsolete although I read in a few places it is a common wear part on John Deere machines.

 

[5030]

Try a tractor salvage yard like Allied Parts.

 

[thepumpguysc]

U only need the rack.??
U can turn the “pinion” 180*.
I have the parts.. u can contact me directly at:
My screen name at aoldotcom

 

[Oldchevyguy]

Yes I need just the rack know about turning the pinion and I have a parts machine but the pump is different and the rack is similar but not the same put the pinion is .