Dear, 

In my experience I have never used vibration analysis to diagnose the condition of an motor hydraulic piston or a pump hydraulic. Some of you have used this technique in this type of assets?, or could you tell me what kind of technique could be used to determine the condition of hydraulic motors.

 

Thanks

Original Post

I have good results diagnosing problems with the motors on hydraulic units. Misalignment, soft foot, bearing issue etc. The pumps on the other hand have been an aggravation. Almost all of the pumps that I check are piston pumps. Most of the time the number of pistons will show up in the spectrum (good to know how many pistons are in your pumps beforehand). Bearing frequencies are seen, but the trick is which amplitude is high. depending on load this changes drastically. At least in my equipment it does. In my opinion  vibration analysis on hyd motor/pumps is worth the time and effort, but does take some time to decide what's good or bad on each unit.

It looks like all the peaks are 1x, there is a raised noise floor which can indicate looseness. Bearing frequencies will not be a whole number. I wouldn’t think you have a bearing issue. Could be the action of the piston??? How many pistons does it have? The TWF is uniform, and not extremely high g’s. Could be showing the stroke of the piston. Is the pump leaking making noise etc? If my conversation is correct the amplitude (0.05 in/s) is not high for what I have seen on my pumps. 

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