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Adjustment on 4020 injector pump?

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David*

03-10-2002 17:00:11




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I didn't fraze my question properly on 3/8/02 concering a 4020 injector, Information I need to know is how to check and adjust injector pump pressure, and what the psi should be on a 4020 John Deere? Thank you




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G-MAN

03-10-2002 20:44:09




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 Re: Adjustment on 4020 injector pump? in reply to David*, 03-10-2002 17:00:11  
There is no way to adjust "injection pump pressure". The pressure generated in the injection lines is generated by the resistance of the nozzles. The pressure the nozzles crack open at is what determines your injection pressure. There is no way to increase it besides installing different nozzles or shimming/cranking up your present nozzles. Just by way of comparison, your 4020 nozzles have an opening pressure of 2500 psi. The new Denso common rail system on the 8000 twenty series tractor can have injection pressures reaching over 20,000 psi. Hope I was of help, G-MAN.

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G-MAN

03-10-2002 20:46:07




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 Re: Re: Adjustment on 4020 injector pump? in reply to G-MAN, 03-10-2002 20:44:09  
I guess I should clarify something now that I think about it. If your pump is excessively worn, it may not generate enough flow to properly crack the nozzles, due to internal wear in the pumping elements. The only cure for this is a pump rebuild. Sorry I forgot that.



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