Oliver 1800 rebuilt injection diesel pump hunts

Good morning,

I have a question. I have an Oliver 1800 A series diesel with a newly rebuilt injection pump. The tractor starts and runs well. However, it seems to hunt at all speeds and will not settle down. If I throttle up to 1300 RPM, the motor will wander between 1000 and 1300. I wanted to know the best way to adjustment on this problem. Thanks so much.
 

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