For hydraulic pump installation or when replacing a hydraulic pump or motor, it is essential that all critical parameters are 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 nay questions regarding replacing pumps, don’t hesitate to call our component group 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 Installation & Replacement Guide
Many 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.
Use This Helpful Guide
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.
Let Us Help You
Using the above information, our trained personnel will select the proper replacement pump. Some pumps, however, have been out of production for a number of years and certain modifications may have to be made