This app will calculate and select the proper sun gear and input adapter to interface most hydraulic motors with any HECO gear reducer model. Start by selecting the motor series you wish to use with the HECO from the drop down list. Over 130 different hydraulic motor series are currently supported. Next select which shaft and mounting flange your motor has from the available options for that motor series. The app will output what the motor shaft length is, which HECO input adapter you need, and which HECO sun gear you will need for any of the HECO gear reducer series.