Karcher HDS-C 8-15 E Steel: Maintenance and care

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7

1 Fuel tank*

2 Fuel filter and fuel pump*

3 Oil tank

4 Burner with continuous heater*

5 Photovoltaic cell for flame monitoring*

6 Exhaust pipe*

7 Container for softener (RM 110)

8 Coin verification unit (optional)

9 Coin container (optional)

10 High pressure pump

11 high  pressure hose 

12 Fan heater

13 Cleaning agent container

* only HDS-C 7/11, HDS-C 9/15

The bases of a safe operating of the equip-

ment is thr regularly maintenance accord-

ing to the following maintenance plan.

Use only original parts of the manufacturer 

or part suggessted by him, such as

–

parts and wearing parts, 

–

accessories parts,

–

operating materials,

–

cleaning agents.

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Danger

Risk of accident while working on the unit. 

During all tasks



Turn off the water supply; close the 

fresh water tap,



First switch-on in voltage-less state, 

switch off the emergency stop switch in 

the building and secure it against being 

switched on again.

Caution

Risk of damage. Never use a high-pressure 

jet to clean the inside of the system.

–

operator

Performances containing the notice 

"operator" may only be performed by in-

structed individualls, who are able to 

operate and service high pressure 

equipment.

–

Maintenance

Performances with the notice "mainte-

nance" may only be performed by the 

Kärcher- Maintenance-Mechanics.

In order to guarantee a reliable operation 

og the equipment, we success, you signed 

a maintenance agreement. Please refer to 

you local Kärcher service department.

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Danger!

danger of injury because of possible dam-

aged parts of the high pressure jet, danger 

of burns because of hot equipment parts.. 

When working, while the equipment is open 

take special care, and obey all safty notic-

es!.

The following parts are possible to be hot-

ter than 50 °C:

–

Exhaust pipe and exhaust opening (on-

ly HDS-C 7/11, HDS-C 9/15)

–

Burner with continuous heater (only 

HDS-C 7/11, HDS-C 9/15)

–

cylinder head of the high pressure 

pump

–

high  pressure hose 

Maintenance and care

System overview

Maintenance instructions

Who may perform maintenance?

Maintenance contract

23 EN

     - 

8

Maintenance schedule

Time

Activity

Performance

By whom

daily

Visible inspection of the high 

pressure hoses

Check high pressure hoses for mechanical damages such as scraping, vis-

ible hose duck, bends, porous and cracked rubber.  Replace damaged high 

pressure hoses.

Operator

Check warning boards at the 

washing place

Check whether the warning boards for the users are available and legible. Operator

Check the unit for leaks

Check pumps and pipes for leaks. Inform Customer Service if there is oil 

under the high pressure pump, if more than 3 drops of water drop out of the 

high pressure pump when the pump is running.

Operator

Check fill level of detergent 

tank

Check filling level, refill if necessary.

Operator

Empty the coin container

Open the plant door and empty the coin container.

Operator

Only HDS-C 7/11, HDS-C 9/

15: Check fill level of fuel tank

Check filling level, refill if necessary.

Operator

Everyday 

under frost 

conditions

Check frost protection devices Is the hot air blower working?

Operator

After 40 

operating 

hours or 

once a 

week

Check oil level of the high 

pressure pump

The oil level must lie between the MIN and MAX markings; else refill.

Operator

Check oil level

Milky oil indicates that it contains water. Inform Customer Service.

Operator

Check filling level of softener 

liquid

Check filling level; refill the softener RM 110, if required.

Operator

After 80 

operating 

hours or 

once every 

two weeks

Clean and maintain housing

Clean the housing thoroughly from inside and outside. 

Take care of the stainless steel casing using steel cleaner (order no.: 6.290-

911.0).

Operator

After 160 

operating 

hours or 

once a 

month

Clean detergent filter in the 

detergent container

Remove filter and rinse it thoroughly with hot water.

Operator

Clean sieve in the water short-

age safe guard.

See Maintenance tasks

Operator

Lubricate the door hinges

Lubricate the hinges with grease (order no.: 6.288-072).

Operator

Door locks

Spray care liquid (order no.  6.288-116) into the locks.

Operator

After 250 

operating 

hours or 

once every 

six months

Check pump head

Customer 

Service

Only HDS-C 7/11, HDS-C 9/

15: Adjust ignition electrodes, 

replace if required

Customer 

Service

After 500 

operating 

hours or 

once a 

year

Check the high pressure 

pump thoroughly

Customer 

Service

Oil change in high pressure 

pump

See Maintenance tasks

Operator

Only HDS-C 7/11, HDS-C 9/

15: Desoot the heating coil, 

adjust burner

Customer 

Service

Only HDS-C 7/11, HDS-C 9/

15: Decalcify the heating coil

See Maintenance tasks

Trained op-

erator

Only HDS-C 7/11, HDS-C 9/

15: Clean the fuel container

See Maintenance tasks

Operator

24 EN

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9 

Danger

Risk of burns due to hot oil or hot parts of 

the plant. Allow pump to cool down for 15 

minutes before oil change.

Note

Please dispose off used oil only in the col-

lection points provided for them. Please 

hand over old oil, if any, only at such plac-

es.  Polluting the environment with used oil 

is a punishable offence.

1 Oil container lid

2 Oil drain screw



Keep a collection basin for old oil ready.



Remove the lid of the oil container.



Unscrew the oil drain screw and collect 

used oil. 



HDS-C 7/11, HDS-C 9/15: Replace O 

Ring 11x2 (order no: 6.362-458.0) and 

turn in the oild drain screw.

HDS-C 8/15-E: Replace copper washer 

14x18 (order no. 7.362-005.0) and turn 

in the oil drain screw. 



Slowly fill in new oil until the "MAX" 

marking on the oil container. 



Close the oil container with the lid.



Deliver the old oil to the respective col-

lection centres.



Loosen covering nut and take off hose.



Take out sieve.

Note

If necessary turn in screw M8 appr. 5 mm 

inwards and therewith pull out sieve.



Clean sieve in water.



Push sieve inwards.



Put on hose.



Tighten covering nut firmly.

There will be calcium deposits in the plant if 

the softening plant (optional) is accidentally 

out of operation for a long time. Calcium de-

posits in the plant can lead to following dis-

ruptions:

–

higher pipe resistances, 

–

reduced heat transfer at the heat ex-

changers, 

–

failure of components spoilt on account 

of calcium deposits.

In the interest of environmental safety, use 

only tested and approved decalcifying 

agents (calcium dissolution acids with test 

marking) to decalcify. The high pressure 

unit should be decalcified using the Kärch-

er calcium solvent.

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Danger

Only persons trained by Kärcher are au-

thorised to decalcify the plant. Risk of ex-

plosion due to combustible gases! Do not 

smoke during decalcification; ensure prop-

er ventilation. Risk of burns injury on ac-

count of acid. Wear protective glasses and 

protective gloves.



Unscrew the hand-spray gund and in-

sert the hose in the drainage duct so 

that the water can flow freely.



Set the hot water temperature to 40 °C.



Shut off water supply.



Start the washing programme with hot 

water until the swimmer container for 

fresh water is almost empty.



Add 0.5 litre calcium solvent to the 

swimmer tank for fresh water.



Leave the water inlet open until the 

swimmer tank for fresh water is full 

again.



Switch on the plant briefly and then let 

the calcium solvent react. Repeat this 

process every 4 to 5 minutes until the 

swimmer tank for fresh water is almost 

empty.



Open the water inlet and let the wash-

ing programme with hot water run for 5 

minutes until the tank is rinsed.



Connect the hand-spray gun to the high 

pressure hose.

Caution

Danger of damage to the fuel pump. Do not 

interchange the forward and backward flow 

pipes for fuel.  This can cause the fuel 

pump to dry run and get damaged. 



Pull out the fuel hoses on the fuel pump. 



Remove the fuel tank from the plant. 



Rinse the fuel tank thoroughly (allow 

the fuel tank rinsed with water to dry 

properly). 



Dispose off fuel residues according to 

environment safety laws. 

The correct setting of the ignition elec-

trodes is very important for the burner to 

function properly. The settings have been 

indicated in the above drawing.

Maintenance Works

Oil change

Clean sieve in the  water shortage safe-

guard (only HDS-C 7/11, HDS-C 9/15)

Decalcify the heating spiral (only HDS-C 

7/11, HDS-C 9/15)

Clean fuel tank (only HDS-C 7/11, HDS-C 

9/15)

Electrode setting SB-HDS 7/11

Electrode setting SB-HDS 9/15

25 EN