23
Unscrew pump outlet.
Take out check ball and check for soiling
or damage of ball or stainless steel seat
inside the pump housing.
Replace non-return valve if necessary.
The pressure gauge shows full pressure although the gun has
been closed. The pressure switch valve switches constantly.
Possible cause no. 2: The return body is soiled
or the sealing ring on the return body is defective.
Caution ! There is no guarantee if the pump is damaged
by defective O-rings due to air induction or lack of water
(cavitation).
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