Bosch SHI 4302 Repair Manual

Contents

H 65Circulation Pump / Motor AssemblyFig. 16-6 Fig. 16-7CIRCULATION PUMP / MOTOR REMOVAL:Disconnect the four wire leads, then grasp the Circulation Motor and turn clockwise a quarter turn untilthe Motor stops, Fig. 16-2. Now, remove the Motor / Rear Pump Assembly from the Front PumpHousing, Fig. 16-3.Note: The Front Pump Housing remains in place when the Motor is removed, Fig.16-3, item 1.With the Motor / Rear Pump Assembly removed from the unit, separate the Motor from the Rear PumpAssembly. To do so, first remove the Impeller by placing a block in the rear of the Motor and then turningthe Impeller counter-clockwise, then Fig 16-4.The Rear Pump Assembly consists of four components, Fig. 16-5:1. 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, Fig. 16-6. Next, locate the Key Square CutOut on the Rear Pump Housing, Fig. 16-3, item 2.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 in the position shown in Fig. 16-2, and turn the Motorclockwise until it stops, see Fig. 16-7.Service note: The Impeller Seal Spring is compressed when the two halves of the Pump Assembly arebrought together. This will take a little force, so make sure to have a good grip on theSump as you compress the spring.Now, reattach the wiring leads, test and check for leaks.