6420 code

pt80 · Nov 7, 2012

I have a 2002 JD 6420 that is showing the code on the dash that says no signal from engine speed sender. I was wondering if this is a problem I can diagnose and repair myself or do I need to call a JD technician.

jared in wi · Nov 8, 2012

With the key off disconnect the wire from the speed sender located on the timing gear cover in front of the injection pump on the LH side of the tractor. It will have a large hex head on it for removing and installing it. If there is oil in the connector, that is a good indication that the sender is bad. Remove the sender and check to see if there is a metal cap on the end that goes in side the engine. If there is no cap I would suggest replacing it regardless.

What happens in that the oil enters the sender and causes faulty readings or no readings. The new sender if you install it will have a metal cap on the end that goes in to the engine to prevent oil from entering the sender. Replace seder and o-ring.

6420 code

pt80

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jared in wi

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