Customer Questions and Answers for Circulation Pump by Bosch

Hello Stewart. CIRCULATION PUMP / MOTOR REMOVAL: Disconnect the four wire leads, then grasp the Circulation Motor and turn clockwise a quarter turn until the Motor stops. Now, remove the Motor / Rear Pump Assembly from the Front Pump Housing. Note: The Front Pump Housing remains in place when the Motor is removed. With the Motor / Rear Pump Assembly removed from the unit, separate the Motor from the Rear Pump Assembly. To do so, first remove the Impeller by placing a block in the rear of the Motor and then turning the Impeller counter-clockwise. The Rear Pump Assembly consists of four components: 1. Rear Pump Housing. 3. Impeller. 2. Main Pump Seal. 4. Impeller Seal. Each component can be replaced as an individual item. TO INSTALL: First, locate the Key Square on the Front Pump Housing. Next, locate the Key Square Cut Out on the Rear Pump Housing. When replacing the Pump / Motor make sure to line up the Key Square with the Key Square Cut Out. Then bring the two pump halves together, and turn the Motor clockwise until it stops. Service note: The Impeller Seal Spring is compressed when the two halves of the Pump Assembly are brought together. This will take a little force, so make sure to have a good grip on the Sump as you compress the spring. Now, reattach the wiring leads, test and check for leaks.