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28
Small repairs do it yourself
No water from the nozzle but the
gauge shows full pressure: Most likely
the nozzle is blocked.
(Inside the pressure gauge there is no water but
a filling with glycol to damp the vibration of the
pointer.)
Proceeding:
Switch off the cleaner. Pull plug from
the socket. Operate gun seveal times to decrease the
pressure. First unscrew gun and lance, then rinse
hose from any residues. Check water inlet filter for
soiling. If the problem still exists, take wire (paper clip)
and push cautiously through nozzle opening. If this
procedure is not successful, the nozzle has to be
dismantled and cleaned (from the backside) or even
replaced, if necessary.
Pressure gauge shows little
pressure, the water from the nozzle comes
in squirts, the high-pressure hose vibrates.
Most likely the valves are soiled.
(Inside the pressure gauge there is no water but
a filling with glycol to damp the vibration of the
pointer.)
Proceeding:
Unscrew all 6 valves, one after the other
(hexagonal brass screws, 3 in a row,
vertically and horizontally)
Take out valve body (with green or red plastic
coating) and O-ring by means of needle nose
pliers. Check O-ring for damage. In case of a
damage the O-ring has to be replaced.
Take a wire (paper clip) and clean valves under
running water. Also clean valve seating inside the
pump.
Do not forget the O-ring during reassembly!
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).
15


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