Bellhousings, or pump motor adapters, are a simple and accurate way to align an electric motor to a hydraulic pump. There are many ways to calculate the length of the bellhousing required and choosing the correct length is critical to your project. Adding the motor and pump shaft lengths together will not always guarantee your assembly will fit, simply because while the electric motor shaft is generally longer than your coupling half, this does not always hold true for the pump shaft. Once you have determined what electric motor, hydraulic pump, and coupling you are using you can follow the chart below to determine the minimum length of bellhousing you require.

Once you have calculated the minimum length required you must choose a bellhousing that is no shorter than yourfinal number. Keep in mind that if the standard bellhousing you choose is longer you must be able to make up the difference in either of the two coupling to shaft engagements as stated by your coupling manufacturer.