Karcher HD 6000 C, HD 4000 C Removing the Cover, Decalcification, Proceed as follows

HD 4000 C / HD 6000 C

E. Maintenance

English

3. Removing the Cover

Certain repair or service procedures may require the removal of the cover. Proceed as follows:

nRemove cover, “A”.

nRemove both cover retaining screws, “B”.

nSlide off cover horizontally, as indicated by the arrow.

4.Decalcification

!Danger!

Explosion hazard through flammable gases! Smoking is prohibited when carrying out decalcification procedures. Ensure adequate ventilation.

Caution!

Acid hazard!

Protective goggles and gloves must be worn.

Lime deposits throughout the water lines of the high-pressure system create increased pipe-run resistance and may result in the failure of calcified components.

According to official regulations, only approved boiler scale dissolvants (de- scaling acid) with test mark may be used.

For scale removal in the high-pressure system, the use of KÄRCHER scale dissolvants should be given preference (RM 100 ASF, hydrochloric acid-free, part no. 6.287-008, or RM 101 ASF, containing hydrochloric acid, part no. 6.287-013).

These products are balanced for use in conjunction with the materials present throughout the system. After decalcification we recommend neutralising the remaining acid residues by flushing the system with an alkaline solution (pH value 7–8).

The instructions for use and accident prevention regulations (dilution according to label specifications), and in particular VBG1, § 4, 14, and 44–47 must be observed.

Proceed as follows:

Begin by decalcifying the float reservoir:

Close water supply.

Remove cover as discussed in para. 3, above. Remove the float reservoir lid. Remove the hose connecting the pump suction side with the float reservoir, pump side. Block the free end of the hose. Pour in 7-percent de-scaling solution. After the conclusion of decalcification, remove all scale residues from the reservoir!

Decalcifying high-pressure system:

Disconnect high-pressure hose from water supply inlet and hang into float reservoir. Next, use the decalcifying acid solution pre- mixed in the float reservoir for shortterm system operation in circulation (idle pressure) mode. Allow chemicals to activate, and conclude by flushing the system.

Decalcifying the cooling coil for the pump motor:

If the flow of cooling water falls below the prescribed rate (see Technical specifica- tions), in spite of sufficient input pressure and a clean strainer in the pressure reducer, then the cooling coil must be decalcified.

Close the cooling water supply.

Remove, i.e., pull off, the water hose from the solenoid valve and hang into a catch container. Remove cooling water hose from float reservoir, position open end of hose at suitable height and fill with de-scaling solution. Allow to activate and conclude by flushing repeatedly.

5.956-648 A10369 (06/98) E6