Replacing The Reservoir Membrane Of A Sterwins Booster Pump 900W 19L 3800L H Repair Guide

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Sterwins Booster Pump (900W, 19L, 3800L/h)
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Step 1

              Tools Needed

Before fiddling with the booster pump, verify that it is not plugged in.
Tools Needed:
Flathead screwdriver
Flat wrench (size 14mm and 12mm)
L-shaped socket wrench (size 14mm)
Flat wrench (size 28mm) or an adjustable wrench

Before fiddling with the booster pump, verify that it is not plugged in.

Tools Needed:

Flathead screwdriver

Flat wrench (size 14mm and 12mm)

L-shaped socket wrench (size 14mm)

Flat wrench (size 28mm) or an adjustable wrench

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Step 2

              Depressurize the reservoir

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.

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.

Step 3

              Unscrew the seal plate

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

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

Step 4

              Remove the seal plate

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

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

Step 5

              Remove the reservoir

Unscrew the valve nut with a flat wrench (size 12mm).
Position the tank upright at 90° to remove the reservoir.

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

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

Step 6

              Replace 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.

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.

Step 7

              Set the reservoir in place

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.

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.

Step 8

              Put the seal plate back on

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).
Repressurize the tank to 1.8 bar max

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).

Repressurize the tank to 1.8 bar max

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                                                                                      One other person completed this guide.                                             


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Annie

Annika Faelker

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                    iRobot

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Neil Glass - Oct 29, 2020

Thank you so much for your tutorial. I am a window cleaner and it is a essential for me. After my pump broke last week I was planning on buying a new one but now its fixed because of you.