MSW Motor Technics MSW-ES-1010 Manual De Instrucciones página 60

c) Turn the machine on with the ON/OFF switch and if all the "TSL" oil is
sucked out of the container, turn it off immediately. Wipe the unit
clean of the ejected oil.
3.4.8 Cleaning the suction valve
Cleaning the suction valve may be necessary if the unit is having trouble
cleaning itself and getting rid of debris. To do this, you need to:
a) Remove the suction hose from the valve.