Kärcher HD 7/18-4 M / MX User Manual

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English 5.906-246.0 Rev. 01 (09/14) 1

HD 6/16-4 M / MX

HD 7/18-4 M / MX

HD 9/19 M / MX

HD 9/20-4 M / MX

Service Manual

Table of Contents

Questions and Answers:

M
Monica GreenAug 5, 2025
How to fix Kärcher Pressure Washer not building up pressure?
- W
  williamsonnormaAug 5, 2025
  If your Kärcher Pressure Washer isn't building up pressure, try these steps: First, set the nozzle to "High pressure" and clean or replace the nozzle. Then, vent the appliance to remove any air within the system. Check the water supply level against the technical data and clean the sieve in the water connection. Also, examine all inlet pipes to the pump, and check the pressure and suction valves for leaks, replacing them if needed. Finally, inspect, adjust, or replace the overflow valve.
B
blakejoseAug 9, 2025
What to do if Kärcher Pressure Washer turns on and off when hand spray gun is closed?
- J
  James WilsonAug 9, 2025
  If your Kärcher Pressure Washer turns on and off while the hand spray gun is closed, the issue might stem from the system's tightness or pressure regulation. Check the trigger gun and the O-rings on the high-pressure hose for leaks, and replace them if necessary. Additionally, inspect, adjust, or replace the overflow valve, and check or replace the pressure retaining valve, as well as the pressure switch or control piston.
S
Scott FowlerAug 13, 2025
Why Kärcher HD 7/18-4 M / MX does not switch off when the hand-spray gun is closed?
- A
  angelalarsonAug 13, 2025
  If your Kärcher Pressure Washer doesn't switch off when the hand-spray gun is closed, it could be due to a pressure issue. Check, adjust, or replace the overflow valve. Also, inspect and replace the pressure retaining valve and the pressure switch. Finally, check or replace the pressure switch or control piston.
J
Jose WrightAug 17, 2025
Why is my Kärcher Pressure Washer not running?
- M
  melinda47Aug 17, 2025
  Your Kärcher Pressure Washer might not be running due to several reasons. First, check the connection cable for any damages. Also, ensure that the supply voltage is correct. If the engine is overheated, turn the device switch to "0" and let it cool off for at least 5 minutes. Finally, inspect and, if necessary, replace the appliance switch and the pressure switch.
V
vmanningAug 22, 2025
How to fix Kärcher Pressure Washer when detergent is not being sucked in?
- M
  Michelle WalshAug 22, 2025
  If the detergent isn't being sucked into your Kärcher Pressure Washer, ensure the nozzle is set to "CHEM". Then, check and clean the detergent suction hose with its filter. Open or check and clean the detergent dosing valve. Also, inspect, clean, or replace the detergent check valve and the nozzle for detergent. Finally, replace the detergent injector if necessary.
T
Thomas OrtizAug 27, 2025
What causes Kärcher HD 7/18-4 M / MX pump to vibrate?
- W
  Walter ShortAug 27, 2025
  If your Kärcher Pressure Washer pump is vibrating, check the suction pipes for water and detergent, making sure they are leak-proof. Close the dosing valve for detergent to operate the machine without detergent. Also, vent the appliance.
C
christina17Aug 30, 2025
How to repair a leaky Kärcher HD 7/18-4 M / MX pump?
- T
  Traci HarperAug 30, 2025
  If your Kärcher Pressure Washer pump is leaky, and you notice water leaking between the cylinder head and the piston casing, check and replace the high-pressure and low-pressure seals. If there are oil leaks between the cylinder head and the piston casing, replace the oil seals. Also, check and replace the piston if needed.

Kärcher HD 7/18-4 M / MX Specifications

General

Power Type	Electric
Flow Rate	700 l/h
Max. Pressure	180 bar
Voltage	400 V
Hose Length	10 m
Working Pressure	180 bar
Power Supply	3-phase

Summary

Safety Instructions

Hazard Levels

Defines hazard levels (DANGER, WARNING, CAUTION, ATTENTION, Note) for safety instructions.

Functionality

Motor and Pump Unit

Detailed diagram of the motor/pump unit with numbered components and their functions.

High Pressure and Low Pressure Seals

Diagrams showing the correct installation positions for high and low-pressure seals.

Pump Diagram (HD 6/16-4, HD 9/20-4)

Schematic of the pump for HD 6/16-4 and HD 9/20-4 models with trigger gun open.

Pump Diagram (HD 7/18-4, HD 9/19)

Hand Spray Gun Operation

Detailed view and function explanation of the hand spraygun and its components.

Pressure and Volume Regulation

Explains the rotary regulator mechanism with ceramic discs for pressure and volume control.

Triple Nozzle Functionality

Basic Settings and Service Procedures

Adjusting the Overflow Valve

Instructions on how to adjust the overflow valve using the setting nut.

Overflow Valve Adjustment (Servopress)

Step-by-step guide for adjusting the overflow valve with a servopress regulator.

Overflow Valve Adjustment (Standard)

Step-by-step guide for adjusting the overflow valve with a standard trigger gun.

Care and Maintenance

Troubleshooting Guide

Circuit Diagrams

Torque Specifications

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