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2.1 Pre-pressurization piston
Please refer the “Pump cleaning” part of maintenance section to drain the media. Turn the pre-pressurization handle out to the
middle position.
Use a 4 mm socket head wrench to remove the three lock bolts on the bottom of the pump.
And use a 24 mm wrench to unscrew the screw nut, as shown in picture 2.1.1.
Pull out the pre-pressurization piston from the pump chamber, as shown in picture 2.1.2.
Please refer to picture 2.1.2 to exchange the damaged parts of the piston.
1
2.Screw nut
Picture.2.1.1
6
4
7
5. Pre-pressurization
piston
Picture.2.1.2
3. Pre-pressurization
handle
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