Karcher SHD-R 3000 - Manual (Page 15)

English SHD-R 3000
5.956-486 A2005937 (06/03) C2
C. System functions
Operational sequence of the high-
pressure pump
„
Cleaning liquid is taken in by the piston.
„
Suction valves (9) prevent cleaning liquid
from flowing backwards.
„ Action of piston pumps cleaning liquid
onwards.
„ Pressure valves (10) prevent cleaning
liquid from flowing backwards.
„ Action of piston takes in cleaning liquid
again.
Features of the high-pressure pump
„ Horizontal construction.
„ Drive runs in an oil bath.
„ Oil compartment for drive unit is separa-
ted from pressure chamber for cleaning
liquid.
„ Pump has three cylinders, each with a
pressure chamber, and one suction
chamber.
Drive for the high-pressure pump
„ The high-pressure pump is driven by an
electric motor.
„ V-belts attached to the electric motor
provide the actual drive to the high-
pressure pump.
Safety valve
!
Danger!
Injury hazard due to excessive pressure
within system. Do not adjust safety valve.
the safety valve has been pre-set and
sealed in the factory. Adjustments should
only be made by a Kärcher Customer
Service engineer.
The safety valve opens if the pressure
exceeds the prescribed maximum level.
Cleaning liquid is allowed to escape,
thereby avoiding damage to the pump and
high-pressure hoses due to too much
pressure in the system.
Pulsation damper
The pulsation damper compensates for the
variations or peaks in pressure. This
reduces the wear on pump components.