In my previous articles on hydrostatic transmissions, I described the technique for determining the condition of a hydrostatic transmission using case drain flow, and discussed the role and influence of a flushing valve when doing this.

In response to these articles, some members were still confused about the influence of the charge pump when determining case drain leakage from … Read more

A recent client engaged me to advise them on an application that required the use of biodegradable hydraulic fluid. This client was tendering on an earthmoving project located in environmentally sensitive wetland. A condition of the contract was that the hydraulic systems of all equipment employed on the project use biodegradable fluid to minimize pollution in the case of oil … Read more

In The Hydraulic Troubleshooting Handbook, I outline a logical approach to hydraulic troubleshooting that begins with checking and eliminating the easy things first. The benefits of this approach are clearly illustrated by a troubleshooting situation I was involved in recently.

The machine in question had a complex hydraulic system, the heart of which comprised two engines driving ten hydraulic … Read more