"The Gold Cup “Hydraulic Drive Sizing Tool” was created to quickly identify the Best Fit Gold Cup Pump and Motor based on several application input values.

A simplified Hydrostatic Drive Diagram is shown to help visualize the circuit and specify customer operating requirements. To keep things simple, preselected average efficiency values are built into the calculation. Once the "'Best Fit'" pump and motor have been determined, application and circuit details can be reviewed with our technical support team to ensure the operating conditions of the application can be met.   If your application is using an input or output gear box, the gear ratios can be entered.  A good rule of thumb for setting gearbox efficiency is 2-3% reduction per stage (ie…a 4-stage gearbox should be set for about 90% efficiency).  For applications without gear boxes, we have set the default gear ratios to 1 and the gear box efficiencies to 100%."

To get started….first select if you plan to enter your requirements in Imperial or Metric units.

You will then need to provide only operating parameters:

1.  Speed of the Prime mover
2. Maximum allowable operating pressure
3. The max torque required on the output shaft
4. The max output shaft speed required

Note:  The tool assumes that you will require both torque (3) and speed (4) simultaneously.

Once you have entered all 4 values, the selector tool will calculate the Best Fit Gold Cup Pump and Best Fit Gold Cup Motor based on the input values.  In addition to the products selected, the tool will also calculate the following:

• The % of full stroke that pump will operate at to achieve the output shaft speed
• The operating pressure required to achieve the output torque with the Best Fit Motor
• The input drive horsepower required
• Speed of both Gold Cup Pump and Motor

It’s possible that an “Error Message” will appear if the application requires a pump or motor beyond the range of what the Gold Cup product line has to offer.  If this is the case, simply adding input or output gear boxes may allow Gold Cup to be used to meet the customer requirements.

For example:  

• If "Exceeds Pump Disp Range" appears, then try increasing prime mover speed or reduce input gearbox ratio if possible.
• If "Exceeds Motor Disp Range" appears, then increase output gearbox ratio, or increase pressure if possible.

Parameter Checks have been added to visually indicate that the selected Pump and Motor will be operating within their rated Pressure and Speed range.  Again, if your Parameter Check shows “out of range”, changing prime mover speed or adding gear boxes may resolve the issue.