4020 Injector Pumps

fatbob50 · Sep 10, 2012

I pulled the pump on my 4020 John Deere and sent it to a place in St Louis to have it rebuilt. When I got it back the washers for the lines were steel and not brass or copper. I called them and they told me that is what is used now as there is less chance of over-tightening them. I am wondering if anyone else has run into this. I do not think it has anything to do with it being a John Deere, which is why I did not post this in the John Deere forum. Thank you for your input, Bob

tjdub · Sep 11, 2012

Honestly, I don't know much about injector pumps, but when I had the one for my 4010 rebuilt a year or two ago, they sent along soft copper washers for the lines. Even torqued to spec, two of them still leaked and I just "nudged" them with a 9/16" wrench and they stopped leaking and have been fine since.

With steel washers, I think you would be MORE likely to strip the bolts by over-tightening them. With soft copper or brass, the washer mushrooms, but with steel it seems like you're just going to rip the threads out of the pump. Maybe the washers they gave you are some other soft alloy, but just not copper colored?

Old Iowa · Sep 11, 2012

They have been steel washers for over thirty years. The steel washers are a softer steel. They work fine. Anything softer starts to leak after much usage.

Trac1 · Sep 11, 2012

Ford / New Holland has used steel - copper - aluminum for sealing washers for the past 30+ years. You will be fine with what they have sent to you.

4020 Injector Pumps

fatbob50

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tjdub

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Old Iowa

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Trac1

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