I recommend changing the oil in any hydraulic system at a minimum once a year. Doing so; this will help the life of any system in more ways then one

Storage, Cleaniness, Inspection, Cleaning, Bleed the System, Check the Oil,

One of the major causes of hydraulic system failures is contamination. Contamination can be from an external source such as dirt, dust or debris entering through cylinders, motors, or quick couplers causing damage to the pump and other components.

History of HQI Hydraulics

Did you know that there are many different cylinders that are required to do the many different operations to make our lives easier? There are single acting, double acting, rephrasing, and telescopic to name a few