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  #1  
Old 2 Weeks Ago
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Question Hydraulic Oil Pump - Oil Sample

As part of my annual maintenance I started taking oil samples. While my engines (8V92 and Gen) look great, transmission looks great, antifreeze looks great, the oil in my hydraulic pump shows some problems. I changed it out last year when I changed the low and high pressure filters on the system. It just uses normal 10w30 motor oil.

The sample showed a high concentration of Copper, Lead, as well as some water in the system. I'm wondering what next steps you think that I should check to ensure a well running pump assembly since we know just how easy those are to get.

Attached is the report.
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File Type: pdf H314463-JGLUBR88880818.pdf (99.5 KB, 31 views)
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That looks just like my last blood test.


Bruce,this sample is from your hydraulic system?
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Yup that is from the hydraulic reservoir.
I changed the fluid and filters in Jan 2019.
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I would get a 2nd opinion.send a 2nd sample off.
How would water get in that system?
Lead and copper?
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Is 10w30 good or should it be HD32?
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Quote:
Originally Posted by Good Ole Bird View Post
Is 10w30 good or should it be HD32?
10w-30 is what is recommended.
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Pulling oil from the reservoir near the filter can end up with skewed results since the wear metals are concentrated there. When was the last time all the oil was dumped and filters changed in the hydraulic system? Most people just change the filters and top off the oil. Just a guess, but it's probably fine.
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Quote:
Originally Posted by badandy View Post
Pulling oil from the reservoir near the filter can end up with skewed results since the wear metals are concentrated there. When was the last time all the oil was dumped and filters changed in the hydraulic system? Most people just change the filters and top off the oil. Just a guess, but it's probably fine.
In Jan 2019 I drained the reservoir and replaced the low pressure filters in the reservoir and changed the high pressure filter. I think the high pressure filter is the low point. When I did that I did get lots more oil out of the system. I'm going to pull another sample from the top of the reservoir. My suction hose may have been down on the bottom of the reservoir on the sample above.

I don't really have any odd noises from the pump or the fan so I'm not sure what else may have a bearing in it. I think the water is a fluke, maybe contamination of the sample or something. I'll know more once they process the second test. I guess it could be the power steering too? There is a clunk in the front end that I haven't been able to isolate, maybe the power steering bearing? But I don't see any leaks in the hydraulic system? Hummm.....
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I don't know much about the guts of the steering box, but the only parts that really normally wear in the pump and fan motor are bronze, probably with lead for machinability in them. If they are worn beyond "spec" then you'll have less flow from the pump and a slower spinning fan. You could measure fan RPM and check output pressure from the pump. There is a test port on the valve that turns the fan motor on/off for a pressure gauge IIRC.
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Assuming copper came from wear plates in pump and motor, as far as water probably condensation, run system all day and park will probably get some moisture. When I test my oil I try and get system up to operating temperature and then cool for 30 to 60 minutes ,but that is just my opinion.
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