Replacing the Reservoir Membrane of a Sterwins Booster Pump (900W, 19L, 3800L/h)

Tools Needed:

Flathead screwdriver

Flat wrench (size 14mm and 12mm)

L-shaped socket wrench (size 14mm)

Flat wrench (size 28mm) or an adjustable wrench

Unscrew the cap covering the valve that regulates the internal pressure of the reservoir.

Using the screwdriver, push on the valve core to depressurize the reservoir.

Using a flat wrench (size 14mm) and a socket wrench (size 14mm), unscrew the 6 bolts holding the seal plate in place.

Unscrew the connection between the head of the pump and the tank with a flat wrench (size 28mm or adjustable)

Unscrew the valve nut with a flat wrench (size 12mm).

Position the tank upright at 90° to remove the reservoir.

Put the valve back into the fastening tab of the reservoir.

Locate the valve's original spot in the bottom of the tank.

Insert the reservoir into the tank.

With your hands, put the valve back in its spot inside the tank.

With a flat wrench (size 12mm), put the nut holding the valve back in place.

Position the lip of the reservoir on the outside rim of the tank.

Reposition the seal plate on the tank.

Screw the 6 bolts back into place with a flat wrench (size 14mm) and a socket wrench (size 14mm).

Screw the nut between the head of the pump and the tank back into place, with a flat wrench (size 28 mm or adjustable).