Karcher HD 9-50-4 - Manual (Page 17)

– 3
Safety devices serve to protect the user
and must not be rendered in operational or
their functions bypassed.
The switch prevents unintented starting of
the appliance. Stop the appliance during
breaks or after operation.
The safety catch on the trigger gun pre-
vents the appliance from being switched on
unintentionally.
– While reducing the water supply/quanti-
ty regulation at the pump head, the
overflow valve opens and part of the
water flows back to the pump suck side.
– If the hand spray gun is closed, the
overflow valve opens and the entire wa-
ter volume will flow back to the pump
suction side. The pressure switch on
the overflow valve sends a signal to the
control, which switches the pump off af-
ter approx. 30 seconds of trailing time.
– If the hand spray gun is opened, the
pressure switch on the cylinder head
turns the pump back on.
The overflow valve and pressure switch are
set and sealed at the factory. Setting only
by customer service.
The safety valve opens when the overflow
valve is defective.
The safety valve is set by the manufacturer
and sealed. Setting only by customer ser-
vice.
The lack of water fuse shuts off the engine
when the water supply is scarce (water
pressure too low).
The indicator lamp "lack of water" will illumi-
nate.
The electrical circuit breaker breaks the
power circuit when there is no voltage in
one of the phases.
The winding proctection contact in the mo-
tor winding of the pump drive switches off
the engine when there is a thermal over-
load.
ṇ
Danger
Risk of injury! Device, tubes, high pressure
hose and connections must be in faultless
condition. Otherwise, the appliance must
not be used.
 Cut off tip of oil container cover
 Check oil level of the high pressure
pump.
The oil level must be at the centre of the
oil level display.
 Add oil if required (see technical speci-
fications).
ṇ
Warning
Risk of injury on account of unsuitable ac-
cessories. Only use accessories approved
for the working pressure of the appliance
(see "Specifications").
Only install accessories when the appli-
ance is switched off.
The maximum torque for the screw connec-
tions of the high pressure hose is 20 Nm.

Connect high pressure hose and spray
pipe to the hand spray gun.
 Mount the power nozzle on the spray
pipe. Tighten covering nut firmly.
 Connect the high pressure hose to the
high pressure connection point of the
machine.
Safety Devices
Power switch
Safety catch
Overflow valve with pressure switch
Safety valve
Attachment set lack of water fuse
(option)
Electrical circuit breaker
Winding protection contact
Start up
Check oil level
Attaching the Accessories
17 EN