1975 (?) JD400 Fuel Pump Leak

NHEngineer · Aug 8, 2022

Greetings;

I just purchased an old and well used JD400 loader/backhoe. Lots of things to fix but I'll tackle one at a time.

Fuel pump leaks almost as much fuel as the engine burns (it seems anyway). Got to wait for the pressure washer before I can tell where on the pump it's actually coming from but, for now, I'm hoping someone(s) out there can give me an idea if this is a common issue and what a recommended fix may be.

I'll send photos once we get things cleaned up if there is any interest. :?

This post was edited by NHEngineer on 08/08/2022 at 09:07 am.

Jim.ME · Aug 8, 2022

Just get a new pump, if it is the transfer pump. The current John Deere replacement part number is RE42211, about $50, used for both gas and diesel. Aftermarket pumps interchanging with that number are available as well.

If you have a diesel (you didn't say) and it is the injection pump, you will be best served to send it to a shop that specializes in them. Or send it to one of the guys (Dieseltech and Al Baker "the pumpman" are a couple) with pump shops that post here.

NHEngineer · Aug 8, 2022

(quoted from post at 12:48:00 08/08/22)
Just get a new pump, if it is the transfer pump. The current John Deere replacement part number is RE42211, about $50, used for both gas and diesel. Aftermarket pumps interchanging with that number are available as well.

If you have a diesel (you didn't say) and it is the injection pump, you will be best served to send it to a shop that specializes in them. Or send it to one of the guys (Dieseltech and Al Baker "the pumpman" are a couple) with pump shops that post here.

When I try to answer with a photo, I get this screen telling me hate speech is prohibited. Que pasa?

This post was edited by NHEngineer on 08/08/2022 at 10:18 am.

Jim.ME · Aug 8, 2022

Not always, but in many cases new users have to have 5 or more posts on record before the site lets them post pictures (or links), due to site spam filters. Another option is to go down to the Site Comments Forum and ask YT Support for permission to post prior to that. You can try going down to the Test Forum and making several posts there to get your post count up, trying to attach your pictures to each post. That may work after you make several posts. Then make your post here again. It may not work immediately after you get past the 5 posts, if not, you might try logging out and back in at that point. There is a size limit as well, I think it is a total of 7mb per post (be it one picture or the total of several). Some pictures (often taken with phones) are too large and have to be reduced before they will post.

So, is your 400 gas or diesel (they made some with both engine types)? is the transfer pump or injection pump leaking if it is diesel?

NHEngineer · Aug 8, 2022

It's the injector pump and it looks like a Roosa Master Stanadyne.

Do those two folks you mentioned have a WEB site? I'd like to get a feel for the cost.

I was told that I should be careful when removing it or the timing would be screwed up and I'd have a $14,000 yard ornament.

Dieseltech · Aug 8, 2022

My E-mail is [email protected] if you want to send the pump model number and get a quote, this old geezer does not have a web site and have no desire to have one.

NHEngineer · Aug 8, 2022

(quoted from post at 16:28:25 08/08/22) My E-mail is [email protected] if you want to send the pump model number and get a quote, this old geezer does not have a web site and have no desire to have one.

I'd rather deal with an old geezer any day than a snotty-nose kid who thinks he knows everything.

I'll try to attach a photo but I can't see the nameplate until my buddy brings the pressure washer over.

Try to get an estimate of turn around time too. Thanks.

It's leaking out of the governor shaft.

Maybe I should just get a gasket/o-ring set if they are acailable.

This post was edited by NHEngineer on 08/14/2022 at 08:50 am.

NHEngineer · Aug 15, 2022

I was talking to an Ex John Deere salesman today. It seems that a fuel pump leak was a persistent problem with this vintage JD's. The main shaft seal also leaked to such an extent that it diluted the crankcase oil and caused the connecting rods to seize and poke a hole in the lower block which explains the patch job just under the fuel pump.

I hope I don't go broke learning to run this baby.

NHEngineer · Sep 11, 2022

(quoted from post at 16:28:25 08/08/22) My E-mail is [email protected] if you want to send the pump model number and get a quote, this old geezer does not have a web site and have no desire to have one.

I sent a jpeg to your email as suggested.

1975 (?) JD400 Fuel Pump Leak

NHEngineer

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Jim.ME

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Dieseltech

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