The input fields are GREEN with blue numbers and the calculated fields are GREY with black numbers  
1. Select the CAM                    
2. Input the maximum flow rate required for the application          
3. Input the maximum pressure required for the application          
4. Select the motors maximum RPM, you can choose from 1800 or 1200 RPM        
RESULTS: Two motor sizes are calculated, one if you are running without a VFD and right below it, the size required if you are using a VFD  
5. Select the motor size you intend to use to calculate the maximum pressure that can be generated
(Hover over row names for comment boxes)              
ACTION PUMP MODEL: F20/F21 D03/M03/D04 D10/M10/D12 D15/D17 H25 D35 D40 D66 T100 Q155 T200 Q330
CALCULATED:
This is a default or calculated field related to the CAM selected (below), representing the recommended maximum pump shaft RPM, refer to this when selecting motor RPM, VFD operation or Pulley Selection MAXIMUM PUMP RPM:
1750 1750 900 1000 450 450 400 400
SELECT CAM:
This refers to the CAM shaft, the F series, D40 and D66 only have 1 displacement option, the others have a drop-down list, select the maximum displacement closest to your required flow rate or one that is compatible with your desired operating pressure and/of materials of construction MAXIMUM FLOW RATE, GPM:
1.0
38 67.8
INPUT:
The maximum flow rate required for the application DESIRED FLOW RATE(GPM):
INPUT:
The maximum pressure you require for the application MAXIMUM PRESSURE (PSI):
SELECT:
The maximum RPM for the motor per its nameplate, we limit the selection to either 1800 or 1200 RPM motors as those are the most common MOTOR MAX. RPM:
CALCULATED:
RESULT: calculated pump/motor shaft RPM required for your input flow rate; you may use a lower RPM motor, VFD, gearbox or belt-drive arrangement OR rely on the pressure regulating valve to bypass excess flow RPM REQUIRED:
CALCULATED:
Horsepower required if not using a VFD, ROUND-UP to the next closest standard motor horsepower (size) in the "standard motor horsepower size" drop-down list below HORSEPOWER REQUIRED:
CALCULATED:
Use this size HP motor if you will be using a VFD to operate within a 10:1 turndown ratio. ROUND-UP to the nearest "standard motor horsepower size" using the drop-down list below HORSEPOWER REQURIED WITH VFD:
CALCULATED:
The inch-LBS required by the motor shaft to deliver the specified flow rate at specified maximum pressure INCH-LBS PUMP MOTOR SHAFT TORQUE REQUIRED:
SELECT:
Choose a standard motor HP size from the drop-down list to calculate the maximum pressure this motor can support STANDARD MOTOR HORSEPOWER SIZE:
CALCULATED:
RESULT: maximum pressure for the motor size chosen MAXIMUM PRESSURE PER  SELECTED MOTOR SIZE: