Bell & Gossett In-Line Mounted Pump 620

Replace any part that does not meet the required criteria

Clean the pump parts in solvent to remove oil, grease, and dirt

Protect machined surfaces while cleaning

Check for the following conditions

Ensure the pump is turned off and disconnected from power source

Remove the pump casing to access the impeller

Carefully remove the old impeller

Install the new impeller ensuring it is securely fitted

Test the pump to ensure proper operation after replacement

WARNING: Pressure might be present in the pump body. You can relieve this pressure by loosening the eight volute capscrews and shifting the bearing assembly slightly in order to allow the pressurized water to escape. Failure to follow these instructions can result in serious personal injury or death.

Remove the eight capscrews that hold the bearing assembly or adapter ring to the volute.

Insert a long punch between the impeller vanes or grasp the impeller with a strap wrench to prevent the impeller from turning.

Remove the following components

Seal and Coverplate Removal (Cast Iron Bearing Assembly)

Remove all of the seal parts and the coverplate.

WARNING: Use a new gasket when reinstalling the bearing assembly to prevent injury or damage.

Wipe the bearing bores clean and remove any rust or scale deposits with a fine emery cloth.

Insert the new wave spring into the rear bearing bore.

Lubricate the OD of the rear bearing with grease

Insert the shaft assembly into the housing and then install and tighten the retaining screws.

For cast iron bearing assemblies, install the coverplate on the housing.

If used, install the adapter ring and gasket on the new bearing assembly.

Allow all system and pump components to cool before handling to prevent physical injury.

Close the isolation valves on the suction and discharge sides of the pump.

Is the system drained if no valves are installed?

Open the drain valve and wait until liquid stops coming out.

Is liquid still flowing from the drain valve?

Describe the repairs needed for the isolation valves if they are not sealing properly.