Therm 895-1 Manual

44 45
Having closed the trigger gun with safety
catch, the high-pressure cleaner must shut
down and the stainless steel pressure gauge
must show the permitted deactivation
pressure (see rating plate). If not shut down
and the stainless steel pressure gauge con-
tinuously shows full pressure (device does
not switch to bypass), 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 cleaner. Shortly press the
trigger of the trigger gun with safety catch
to decrease the pressure. Remove high-pres-
sure hose, trigger gun with safety catch and
lance and check the O-rings. If the O-rings
are damaged they have to be replaced.
Small repairs - do it yourselfSmall 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.