Hydraulics Pro Club member Rich Catalo sent me this tragic story:
“We deal with a very large dock and dredge company. They have many pieces of hydraulic equipment from different manufacturers. The last call I received was due to a tech who removed a hydraulic cylinder that was in need of a re-seal. The tech did OK removing the cylinder … Read more
In response to my previous post about troubleshooting hydraulic cylinder drift, a couple of our members thought the influence of valve-spool configuration on cylinder drift warranted discussion. Charlie Field from Perry Slingsby Systems in the UK sent me this message:
“By far the most common reason for cylinder drift is the DCV controlling it. Closed to actuator spools almost … Read more
A common misconception about hydraulic cylinders is that if the piston seal is leaking, the cylinder will drift down. Fact is, if the piston seal is completely removed from a double-acting hydraulic cylinder, the cylinder is completely filled with oil and its ports are plugged, the cylinder will hold its load indefinitely – unless the rod-seal leaks.
What happens under … Read more