Kärcher HD 9/20-4 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:

C
Catherine JohnsonAug 5, 2025
How to fix Kärcher HD 9/20-4 M / MX Pressure Washer not building up pressure?
- G
  Gary StewartAug 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.
M
Marc Medina Jr.Aug 9, 2025
What to do if Kärcher HD 9/20-4 M / MX Pressure Washer turns on and off when hand spray gun is closed?
- S
  scottwilliamsAug 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.
B
Brandy HendersonAug 12, 2025
Why Kärcher Pressure Washer does not switch off when the hand-spray gun is closed?
- S
  Sean MonroeAug 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.
C
Christopher DuncanAug 17, 2025
Why is my Kärcher HD 9/20-4 M / MX not running?
- Z
  zdavisAug 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.
A
Amanda NorrisAug 22, 2025
How to fix Kärcher HD 9/20-4 M / MX when detergent is not being sucked in?
- T
  Tony MarshAug 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.
D
Diana ButlerAug 27, 2025
What causes Kärcher HD 9/20-4 M / MX Pressure Washer pump to vibrate?
- N
  noblekatelynAug 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.
J
James PinedaAug 30, 2025
How to repair a leaky Kärcher HD 9/20-4 M / MX pump?
- R
  Robert FrankAug 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 9/20-4 M / MX Specifications

General

Brand	Kärcher
Model	HD 9/20-4 M / MX
Category	Pressure Washer
Language	English

Summary

Safety Instructions

Hazard Levels and Symbols

Explains safety symbols like DANGER, WARNING, CAUTION, ATTENTION, and NOTE.

Parts of the System

Rear View Components

Labels and describes the external parts visible from the rear of the appliance.

Function

Motor/Pump Unit Diagram

Provides a detailed breakdown and labeling of the motor and pump assembly.

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

Shows the hydraulic flow path when the trigger gun and regulator are open.

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

Explains hydraulic flow when the pressure regulator is partially closed.

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

Depicts the hydraulic flow when the trigger gun is closed.

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

Illustrates hydraulic flow for specific models with the trigger gun and regulator open.

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

Explains hydraulic flow for specific models when the pressure regulator is partially closed.

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

Depicts hydraulic flow for specific models when the trigger gun is closed.

Basic Settings and Service Procedures

Overflow Valve Adjustment

Circuit Diagram

HD 6/16 Electrical Circuit

HD 7/18, HD 9/19 Electrical Circuit

HD 9/20 Electrical Circuit

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