Table of Contents
Advertisement
29
The pressure gauge shows full
pressure although the gun has been
closed. The pressure switch valve
switches constantly.
Possible cause no.1: Leakage
Having closed th gun, the HP cleaner must shut
down and the pressure gauge must show „0"
bar. If the pressure gauge still shows full pres-
sure and the motor constantly switches on and
off, the possible reason for this can be a leakage
of the pump, the HP hose or the lance.
Proceeding:
Check the connections from the HP cleaner to
the the HP hose, from the hose to the gun and
also the connection between lance and gun for
tightness. Switch off the cleaner. Shortly press
the trigger of the gun to decrease the pressure.
Unscrew HP hose, gun and lance and check the
O-rings. If the O-rings are damaged they have to
be replaced.
In case of a leakage there is no guarantee for
possible consequential damages.
Possible cause no. 2:
The non-return valve is soiled or
defective
Proceeding:
Unscrew pump outlet.
Take out non-return valve ball and check ball
and stainless steel seat for soiling or damage.
Replace non-return valve if necessary.
There is no guarantee if the pump is
damaged by defective O-rings due to air
induction or lack of water (cavitation).
Advertisement
Table of Contents
