4020 Reving @ start up

[aadin.hager]

My Grandpa's got a 4020. Last year I started it up around may (it was the first start up for the summer) and it idles high and low until I rev and it will idle fine. It been doing it ever since and it does it when I get into 7th gear at idle. Its a powershift. Thanks just seeing if it's a easy fix.

 

[Dieseltech]

The injection pump needs repair. Keep running it and soon the governor retainer pins will shear off and have no governor at all, and risk seizing the hydraulic head and
break the drive shaft.

 

[used red MN]

AH welcome to YT! Gas or diesel? If it is a diesel it
probably needs the injection pump rebuilt. Likely
caused by the governor weight assembly flex ring
breaking apart. Being exposed to the fuel, heat and
time it becomes hard and starts breaking to pieces.
The pieces float around in the pump and get lodged in
to the wrong places and cause this kind of symptom.
Let us see if others confirm. I will link a bit more info
about one for sale, it shows a photo of it being
replaced. However, this is not a job for the average Jo.
There is a gentleman that posts on this forum as
Dieseltech. He runs a pump rebuild shop in Indiana.
Many on here ship their pumps to him to be rebuilt.
Always hear how good of job he does and many
comment on his reasonable pricing. Hopefully, he will
see your post and comment.
Edit: Looks like while I was typing DT was giving you the direct answer.
Flex ring


This post was edited by used red MN on 09/06/2023 at 01:34 pm.

 

[aadin.hager]

I appreciate the information!

 

[David from Kansas]

Seems like anyone who has owned a JD 4010, 4020, 5010, 5020 and others with the same pump has experienced this problem,
including me.