Injection Pump JD 410 Backhoe Question

DRussell

Well-known Member
I was pushing brush back from the edge of a field with the backhoe this morning when a limb came in next to the motor and broke the return line at the top of the injection pump. The fitting that broke is the one right on top of the pump. I think I remember from when I had to have the pump rebuilt about a year ago that there is a one way valve at the return line on this pump.

The fitting that broke has a chamber inside it with what looks like a small piece of shaped glass inside the chamber. The fitting broke right at the top of the chamber. I was able to get the bottom of the fitting out of the pump with an easyout. I've attached some pictures of the fitting that broke. Hopefully you can get the idea of what it is from the fitting?

Is this fitting the one way valve?

Will running it without this special fitting damage the pump? I presume this would have to come from an injection pump shop or from JD.

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In the short term running without it won't hurt. Some guys toss them & run for years without. Personally, I'd finish what I'm doing, then replace it ASAP
 
No mention of it. But just in case you are considering just plugging it off you tractor will not run. If my memory is correct I believe that screws in and seals with an oring. May be a small possibility that an ORB hydraulic fitting will screw in and seal and get you to pipe thread for a hose barb. Know of any GM 6.2L or 6.5L, or Ford 6.9 or early 7.3a pickups parked in the junk row around you? They all ran Roosamaster pumps, any of those would have one. Many Allis and Olivers also ran them.
 
It's part number 15830, has 1/8 inch pipe threads each end. The AUTOMOTIVE return valves will NOT fit, so don't even try them. All LATE pumps use an O ring thread in the cover instead of the pipe thread like early pump covers use. While the fitting should be in place for advance curve reasons, engine will run OK without it for awhile.
 
To the OP sorry about the misinformation. Thanks DT for that correction. Been to long since I have been around them, relying on your memory at 60 can have some complications and I know to some that is young.
 
Thank you for the specific information, including the part number. This tractor is a 1983 model, one of the last straight 410s that were built, that doesn't mean it has a late pump though. I didn't see any evidence of an O ring when I removed the fitting. Seemed like pipe thread to me.
 

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