pump replacement?

[notme]

hello... i have an old case 1816 uniloader the aux hydraulic pump has a bent shaft... still works but has quite a shake to it. need to find a replacement and not having much luck.

its a borg warner pump
# on the case is S125OAK 55R
under that # is 05098
can anyone give me an idea where i might find replacement parts (shaft) or a replacement pump? its belt driven so a replacement would have to be capable of that. can anyone explain what the stamped in #s might say about this pump?

 

[oldnslo]

Bosch Rexroth purchased Borg Warner gear pumps many many years ago and the info that I have does not exactly match the model code that you have. Attached is old data sheet that you can use for displacement and dimensional reference. The unknown appears to be the shaft.


S = External gear pump
12 = displacement range (size)
50 = 0.58 cubic inch/rev (9.5 cc)
A = SAE ORB side ports
K = SAE A-A 2 bolt mtg flange
5 = unknown shaft
5 = design series
R = clockwise rotation

 

[notme]

Bosch Rexroth purchased Borg Warner gear pumps many many years ago and the info that I have does not exactly match the model code that you have. Attached is old data sheet that you can use for displacement and dimensional reference. The unknown appears to be the shaft.


S = External gear pump
12 = displacement range (size)
50 = 0.58 cubic inch/rev (9.5 cc)
A = SAE ORB side ports
K = SAE A-A 2 bolt mtg flange
5 = unknown shaft
5 = design series
R = clockwise rotation

thanks alot... now i can check surplus center or maybe amazon for a cheap replacement.
so the unknown shaft what does that mean? its a 1/2 shaft? which really doesnt matter as i can match a pulley to any shaft?

 

[oldnslo]

By unknown shaft I meant it didn’t show as an option in the data sheet

Might have some different bearing option for the side load from belt drive

 

[SiteEngineer]

A bent shaft will only get worse, so good call trying to replace it. Those Borg Warner pumps are hard to find new now. I’d check with salvage yards or a hydraulic shop that can cross-match the numbers to a modern pump.

 

[TractorTech]

Did you see the used pump I listed in one of the two other posts on the same subject?

 

[mark in portugal]

You need to find the Bosch / Rexroth number, which seems to be the defacto standard cross reference.
How I did that; I found the factory part number, and put it into google. Some suppliers advertised replacement pumps, and the ads had several numbers, one was the Bosch number.
When I had that, I put it into google and found an unused second hand one that someone was selling.
Somewhere in between, I figured out I could bolt on a 25% larger capacity one, and that was what I got.

There are different shafts; splines of various types, cones with key, or straight with key. Different flanges with different centering collars / bolt holes. And there are right and left turning options too.

As yours is belt driven, you have options if you can fabricate a bracket and fit the pulley.

For instance;