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Fluid Power Formulas | Oil Recommendations |
| Cylinders | Pumps | Valves | Glossary of Terms |

Hydraulic Info: Pump Installation & Operationing Instructions

[Replacement Guide
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 componenet group at 1-800-728-5168.


Figuring Gear Pump G.P.M.

Figuring Hydraulic Gear Pump GPM

GPM @ 1000 RPM
= 26 X w X (2D -L) x pump_installation_formula
GPM @ 1200 RPM = 31 X w X (2D -L) x pump_installation_formula
GPM @ 1800 RPM = 47 X w X (2D -L) x pump_installation_formula

EXAMPLE: GPM @ 1000 RPM
    D = 1.990
    W = 1.738
    L = 3.705

GPM = 26 X w X (2D -L) x pump_installation_formula

GPM = 26 X 1.738 X (2.1.990 -3.705) X pump_installation_formula

GPM = 45.188 X .275 X .8575

GPM =10.656 11 GPM@1000RPM


Hydraulic Info:     Pump Replacement Guide

[Installation and Operationing]   [Top of Page

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.

Replacing Hydraulic Pumps

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 Type of mounting flange Port size & type Gear diameter & width Other information

Let Us Help You Using the above information, our trained personnel will select the proper replacement pump. Some pumps, how- ever, have been out of production for a number of years and certain modifications may have to be made.

[Installation and Operationing]
[Replacement Guide]
[Top of Page


  Hydraulic Pumps Technical Information
1. Pump rotation is designated by looking at the pump shaft end (see diagram at top). Rotating the pump in the wrong direction of rotation will damage the pump.
2. Exceeding the pump's performance capabili- ties will result in reduced pump life. Call our sales department for specifics.
3. Use clean S.A.E. #10 anti-wear hydraulic oil.
NOTE: Pump inlet oil temperature should not exceed +225 F.
4. Start with a clean hydraulic system and then use a 10 micron return line filter to keep it clean.
5. Line size to the pump inlet (suction line) should not be smaller than the pump port size. Increase inlet line size (diameter) 1/4" for each 2' of length.
NOTE: Pump inlet vacyum should not exceed 5" of mercury at operating temperature.

CAUTION: WHEN INSTALLING PUMPS AND VALVES, SECURE TRUCK BED OR OTHER EQUIPMENT TO AVOID SERIOUS INJURY IF EQUIPMENT SHOULD DROP.
6. After installing a pump, it is desirable to run ( pump at lowest possible RPM and zero pressure for several minutes. The pump should run free ( and not develop leaks or build up heat. If unit operates properly, then the speed and pressure ( can be increased to normal operating settings.
NOTE: A pressure gauge should always be used at the pump outlet port to set the system relief valve to its operating setting.
7. When driving the pump with a driveline, consult the driveline manufacturer's literature for operating angles, speeds and lengths.
8. lf there is ANY problem with your pump after installation, call Precision Fluid Power before disassembly. Any modification or disassembly of the pump or motor will void the manufacturers warranty.