John deere 4020 will not shut off

Zacharycole85 · Jan 28, 2023

I have a 1966 4020 throttle works fine but will not shut off

used red MN · Jan 29, 2023

Hello Zach welcome to YT! The majority of 4020s were
diesel, so we can assume that this is diesel and not a
gas engine? I assume you are pulling the stop knob on
the end of the throttle to move the throttle to the stop
position, duh. Get down by the pump and push the
lever to move more towards the stop position, if that
makes it shut off your linkage is out of adjustment or
has too much wear in the joints. If that does not shut it
off something in the pump is worn or has broke.

Zacharycole85 · Jan 29, 2023

Yes it is a diesel , Ive disconnected the linkage at the pump and pushed the arm down tractor still doesnt die , any ideas on what could be broke ,something in injection pump?

Dieseltech · Jan 29, 2023

Sounds like the stop cam inside the pump has broken/fallen off the throttle shaft assembly.

Zacharycole85 · Feb 1, 2023

Its that a repair I could do without rebuilding whole pump ?

John deere 4020 will not shut off

Zacharycole85

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used red MN

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Zacharycole85

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Dieseltech

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Zacharycole85

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