Karcher HKF 50 E: Start up

English

 15 

Danger

–

The explosion protection must be taken 

into consideration when operating with 

solvents as well as in EX zones!

–

Maximum pressure with solvent opera-

tion: 5 MPa

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Warning

When operating with solvents, the sealing 

materials are less resistent, therefore they 

must be flushed immediately after use! En-

quire with Kärcher!

1 Hydrocarbons

Example: Petroleum

2 Aromates (solvents)

Example: Benzene, toluene

3 Ketones

Example: MEK (Methyle Ethyle Ke-

tones), Acetone

4 Ester

Example: Butylacetate, Methylacetate

5 Glycoles

Example: Butyl glycole

6 Mixed solvents

Example: Butyl acetate 85, Isobutyl ac-

etate 85 (85 = 85% Butyl acetate + 15% 

n-Butanol)

7 Regenerates, distillates from different 

solvents, which have already been used 

for cleaning purposes or similar applica-

tions.

1 Water with alkaline cleaning agents 

(max. 0-2%)

Example: Kärcher cleaning agents 

RM31

2 Caustic soda max. 10%, without hy-

pochlorite particles

3 Potassium hydroxide max. 10%, without 

hypochlorite particles

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Warning

–

The material will be worn off faster when 

using hydrochloric or sulfuric acids; 

therefore it must be rinsed/neutralised 

immediately!

–

Contaminated acids will decrease the 

resilience!

–

Enquire with Kärcher if needed!

1 Water with acid cleaning agents (max. 

0-1%)

Example: Kärcher cleaning agents 

RM25

2 Acids (max. temperature +20 °C)

Nitric acid max. 10%.

Acetic acid max. 10%.

Formic acid max. 10%.

Phosphoric acid max. 10%.

Citric acid max. 10%.

Sulfuric acid max. 0.5%.

Hydrochloric acid max. 0.5%.

1 Water

2 Fully desalted water

If other cleaning liquids are used, their resil-

ience must be checked by means of the 

materials list! These cleaning liquids can 

only be used after being released by Kärch-

er!

* Standard

Special nozzles for solvent operation on re-

quest.

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Danger

Risk of fatal injuries on account of electric 

voltage! Required electrical work must only 

be performed by an electrical specialist.

– The socket must be secured through a 

wrong current protection switch with a 

triggering current of 30 mA.

– This socket must be located close to the 

work station so that the plug can be 

pulled immediately in case of an emer-

gency.

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Warning

In order to avoid damage to the com-

pressed air drive by condensation wear and 

lack of lubrication, install a maintenance 

unit into the compressed air supply (order 

no. 6.610-020).

This maintenance unit must be laid out as 

follows:

– Air throughput of 500 l/min

– Pressures up to 0.7 MPa

The maintenance unit consists of:

– Water separator

– Pressure regulator with manometer

– Proportional oiler



Fill the proportional oiler with suitable lu-

brication oil by unscrewing the reservoir 

and filling it with lubricating oil (for oil 

type see "Care and Maintenance“).

Note

If the silencers are too small, the created 

backpressure of the exhaust air will cause 

an unstable run of the compressed air drive. 

Connect hoses to the exhaust air openings.



Connect an air supply hose to connec-

tion no. 2.

– Hose size for supply air: DN 6



Connect exhaust air hoses to connec-

tion no. 1 and EXH.

– Hose length: 1 -2 m

– Hose size for exhaust air: DN 6

Note

Lubricate the threads with a sealant prior to 

installation, so that no cleaning liquid can 

leak from the threads (e.g. with Drei Bond 

no. Nr. 1359, Kärcher order no. 6.869-029).

1 Screwed sealing plug

2 Bevel wheel

3 Axle stub

4 Drum screws or hole cone



Loosen the locking screw.



Pull off the bevel wheel.



Unscrew axel stub by means of a round 

tool (2.8 mm diameter).



Insert or replace drum screws or hole 

cone.



Lubricate axle stub with sealant and 

screw it in.



Attach bevel wheel.



Lubricate locking screw with sealant 

and screw it in.

Cleaning liquids

solvents

Brines

Acids

Water

Other cleaning liquids

Selecting the nozzle

Flow vol-

ume [l/h]

1200 1200 1000 1000

Pressure 

[MPa]

9,5

9,5

9,5

9,5

Number of 

nozzles

2

1

2

1

Nozzle size 

[mm]

1,4 * 2,0

1,2

1,7

Order No. 

5.765-

012

015

014

013

Start up

Electric drive

Compressed air drive

Connect compressed air hoses to the 

compressed air motor

Attach drum screws or hole cone