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Having closed the trigger gun with safe-
ty catch, the high pressure cleaner must
shut down and the stainless steel pressure
gauge must show „0“ bar. If not shut down
and the stainless steel pressure gauge con-
tinuously shows full pressure, this could be
due to leakage at the high pressure pump,
at the pressure switch, at the high pressure
hose or at the trigger gun with safety catch.
In case of a leakage there is no guarantee for possible
consequential damages.
Problem
After closing the safety trigger gun the high pressure cleaner
keeps switching on and off.
The stainless steel pressure gauge continuously displays full pressure.
Possible cause No. 1
Leckage.
Proceeding:
Check connections from the high pressure
cleaner to the high pressure hose and from
the high pressure hose to the safety trigger
gun and also the connection between lance
and safety trigger gun for tightness.
Switch off the high pressure cleaner.
Shortly press the trigger of the safety
trigger gun to decrease the high pressure
cleaner. Unscrew high pressure hose,
safety trigger gun and lance and check
the O-rings. If the O-rings are damaged
they have to be replaced.
Small repairs - do it yourself Small repairs - do it yourself
Proceeding:
Switch off the high pressure cleaner and
pull plug from socket. Stop water supply.
Operate safety trigger gun catch several
times to decrease the pressure.
Unscrew pump outlet.
There is no guarantee if the high pressure pump is damaged by
defective O-rings due to air induction or lack of water (cavitation).
Remove check body and check O-Ring
for soiling or damage. Also check seal seat
inside pump housing for soiling or damage.
If sealing rings are defective replace
O-rings at once.
Problem
After closing the safety trigger gun the high pressure cleaner
keeps switching on and off.
The stainless steel pressure gauge continuously displays full pressure.
Possible cause No. 2
The non-return valve is defective.
15


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