For hydraulic pump repair, replacement, or when installing a hydraulic pump or motor, all critical parameters must be taken into account. Be sure you know the required system, pressure, RPM range, direction of rotation, shaft size and type, port size and type, and mounting information. If you have any questions regarding replacing pumps, don’t hesitate to call Precision Fluid Power at 1-800-728-5168.
Figuring Gear Pump G.P.M.
GPM @ 1000 RPM = 26 X w X (2D -L) x 
GPM @ 1200 RPM = 31 X w X (2D -L) x
GPM @ 1800 RPM = 47 X w X (2D -L) x
EXAMPLE: GPM @ 1000 RPM
D = 1.990
W = 1.738
L = 3.705
GPM = 26 X w X (2D -L) x
GPM = 26 X 1.738 X (2.1.990 -3.705) X 
GPM = 45.188 X .275 X .8575
GPM =10.656 11 GPM@1000RPM
Hydraulic Pump Replacement Guide
Many Hydraulic Pumps Are Identical
In many cases, OEM’s have used pumps from several different manufacturers for the same model of equipment and are, for all practical purposes, identical.
How Do You Replace A Hydraulic Pump?
If you have a pump that needs replacing, the following information would be helpful:
Number (if any) stamped on pump direction of rotation, shaft size & type of mounting flange, port size & type, pear diameter & width.
Can Precision Fluid Power Help with Hydraulic Pump Replacement?
Yes! Using the above information, our trained personnel will select the proper hydraulic pump repair, replacement, or installation. Some pumps, however, have been out of production for several years, and certain modifications may have to be made. Precision Fluid Power has the knowledge and parts supply to replace or repair your hydraulic pumps. Numerous plant managers recognize Precision Fluid Power as providing the best hydraulic pump repair near me, specifically for high-pressure piston and vane pumps. Contact us today to get started.