New Problem Servo System Pump Keeps Failing
By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM
CFC Industrial Training
A company that manufactures plastic bottles for suppliers of motor oil started losing pressure-compensated pumps weekly on one of four identical units. The system used a servo valve for controlling a cylinder that had to maintain a position very accurately, and both oscillated continually. They could not understand why three units worked fine but one gave them problems.
The 5-gpm (19-lpm) pumps were internally grenadeing. After each failure, they cleaned the entire system of debris, changed the filter elements, inspected the case line for broken pump parts, and installed a new intake-line hose, but they were still losing pumps on an average of one a week, a total of four pumps when I was called into help.
What could be causing the problem?
Robert Sheaf has more than 45 years troubleshooting, training, and consulting in the fluid power field. Email rjsheaf@cfc-solar.com or visit his website at www.cfcindustrialtraining.com.
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Was the pump outlet check valve broken? Maybe accumulator or bore of cylinder decompressing thru pump and blowing the shoes off the piston? O-ring holding open check valve?