Baker ZA pump Jack

[Kansas Rust Buzzard]

I have had really good luck with them for years, I wore my first one out pumping 24-7 and just wore the second one out after pumping garden water for many seasons. I decided I needed to fix it as I didn't have another to replace it. I just opened it up and the gears have no wear, the lower shaft is about 95% also, all the wear was in the top shaft causing it to go clunk, clunk just like the first one. My observation is, dust and whatever had got into them, probably some condensation and general dirt from sitting around unused at times. I always keep oil in them but the little passage that pushed oil to the top shaft had plugged up so only it wore out. Now I figured it would just need bushings or something replaced but no, there is no bushing in the top, only cast iron from what I can see? I found this odd on a high quality pump jack like that?

I am debating what to do, I may see if I can put it in the mill and machine out a pocket for a bushing? It looks like most of the wear is not on the shaft. If I just run it a few days a week for the garden I might be able to get some shim stock in it and leave it plugged up so it don't pump my oil out? Or maybe just put the first one back on as it will likely last for years just like it is? I am still pondering this, anyone else have the same issue? I suppose I should just put a small stripper well oilfield pump jack on it and forget about the Monitor but I have them. Always something.....

[Gregg]

Here is the repair part sheet for your ZA, now if you could only find the parts. Sorry the prints are to big to get in my scanner in one sheet.
Gregg

Monitor ZA c.jpeg

Monitor ZA d.jpeg

[Gregg]

Here are the front & back pages for the ZA.

Monitor ZA a.jpeg

Monitor ZA b.jpeg

[Kansas Rust Buzzard]

Thanks Greg, they really are high quality units. There is a little hole about the size of a pencil the oil goes through to that top shaft ad that is what always plugs up. Oddly, in your parts list they show bushings on the internal parts but the outside housing doesn't have them and that is where I need them.