From the book "Insider Secrets to Hydraulics” by Brendan Casey:
The expected service life of individual components within a hydraulic system varies and is influenced by a number of factors. These include the type and construction of the component, circuit design, operating load and duty cycle. Machine manufacturers determine the expected service life of components within a particular system by considering these variables in combination with historical data on achieved service life. This information is normally available from machine manufacturers upon request. To minimize the chances of hydraulic components failing in service, the machine manufacturers' recommendations on expected service life should be used to schedule component changeouts.
Read more about "Insider Secrets to Hydraulics"
| 
