Hydraulic pumps: All SAE standard hydraulic pumps have basic configurations in common that are the basis for interchange. They include shaft diameter, keyway and length. The mounting pads are standard as well and are either 2 or 4 bolt and SAE size A, B, C, D, E, & F. The majority of pumps are A-D. The suction, pressure and drain port size and location are different on every pump. While this may sound like a major obstacle, it is only a consideration if your existing pump is plumbed with hard pipe or tubing. If you are unwilling to modify that, you must replace with the same pump. Using hard plumbing is not good hydraulic design practice. It limits your ability to replace the pump with other manufacturers; it resonates noise from the pump to the reservoir; and causes leaks due to vibration of the pump motor group. In short, if your pump is hard plumbed, we recommend that when you replace the pump, you install hose on the first run from the pump to the power unit on all ports. This will isolate the vibration to the prime mover.

Hydraulic valves: Valves must be classified as industrial or mobile. This discussion, will be limited to industrial. There are basically two considerations in interchanging subplate mounted valves. Fit and function. Directional valves are the same fit between all manufacturers and correspond to both SAE and European Convention (ISO-Cetop). Directional valves are either switching, proportional or servo. Once the physical mounting has been determined, the functional characteristic of the valve must be interchanged. With a variety of functions built into modern valving, it is necessary to pay close attention to the performance of each interchange. Flow, pressure ratings, response times, etc play into the process.

We here at Flow Dynamics have the expertise to change a simple switching directional valve to a better solution as well as the more complicated proportional and servo valves to either Moog or Atos, depending on the requirement. The service after the sale, in particular for proportional and servos is extremely important. For example, several years back Moog made the decision to delete the sale of parts for their servo valves. Independent servo repair houses were repairing Moog servo valves to a substandard level. Moog's’ reputation for producing only the highest quality servo valve was being tarnished, so Moog opened it’s own factory repair center that can turn a Moog, Atchley, Pegasus and Dowty servo valve around in three to five working days and quicker if necessary. Each repair carries a new 2 year warranty and a report of what was done to the valve and recommendations for better performance. Moog also offers an in-place servo valve tester to help our customers determine if the problem lies with the valve or elsewhere in the system.

You can trust Flow Dynamics with your hydraulic problems. We can interchange virtually any hydraulic pump and valve. If necessary, we can dig further in the system to uncover problems and recommend solutions. Simply fill out the data box and submit it to our staff. Please give us all the information possible to insure a good cross over.

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