Kärcher HD 9/19 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:

B
bmarshallAug 4, 2025
How to fix Kärcher Pressure Washer not building up pressure?
- E
  Elizabeth CruzAug 4, 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
bhallAug 8, 2025
What to do if Kärcher HD 9/19 M / MX Pressure Washer turns on and off when hand spray gun is closed?
- S
  suzanne50Aug 8, 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.
W
wdavisAug 13, 2025
Why Kärcher Pressure Washer does not switch off when the hand-spray gun is closed?
- H
  hwigginsAug 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.
N
nelsongregoryAug 17, 2025
Why is my Kärcher HD 9/19 M / MX Pressure Washer not running?
- R
  Ronald LewisAug 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.
S
Shelly GlennAug 21, 2025
How to fix Kärcher Pressure Washer when detergent is not being sucked in?
- W
  watkinswilliamAug 21, 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.
J
Jason TrujilloAug 26, 2025
What causes Kärcher Pressure Washer pump to vibrate?
- V
  Victoria WarnerAug 26, 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.
L
lopezjenniferAug 30, 2025
How to repair a leaky Kärcher HD 9/19 M / MX pump?
- D
  Denise PowellAug 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 9/19 M / MX Specifications

General

Brand	Kärcher
Model	HD 9/19 M / MX
Category	Pressure Washer
Language	English

Summary

Safety Instructions

Hazard Levels

Explains different danger levels (DANGER, WARNING, CAUTION, ATTENTION, NOTE).

Function

Motor/Pump Unit Assembly

Provides a detailed diagram and labels of the motor and pump assembly.

Pump Head Details

Illustrates the pump head with labeled internal components.

High Pressure Seal / Low Pressure Seal

Illustrates the cross-section and installation of high and low-pressure seals.

Pump Diagram

HD 6/16-4, HD 9/20-4 Trigger Gun Open State

Shows the pump diagram for specific models with the trigger gun and regulator open.

HD 6/16-4, HD 9/20-4 Regulator Partially Closed State

Explains the pump diagram state with the servopress rotary regulator partially closed.

HD 6/16-4, HD 9/20-4 Trigger Gun Closed State

Explains the pump diagram state when the trigger gun is closed.

HD 7/18-4, HD 9/19 Trigger Gun Open State

Shows the pump diagram for different models with the trigger gun and regulator open.

HD 7/18-4, HD 9/19 Regulator Partially Closed State

Explains the pump diagram state with the servopress rotary regulator partially closed.

HD 7/18-4, HD 9/19 Trigger Gun Closed State

Explains the pump diagram state when the trigger gun is closed.

Hand Spraygun

Operation and Maintenance Notes

Explains hand spraygun operation and provides notes on the node piece.

Function (Continued)

Pressure and Volume Regulation

Triple Nozzle Operation

Basic Settings and Service Procedures

Adjusting the Overflow Valve

Details the procedure for adjusting the overflow valve.

Overflow Valve Adjustment: Servopress Regulator

Specific steps for adjusting the overflow valve with a servopress regulator.

Overflow Valve Adjustment: Standard Trigger Gun

Specific steps for adjusting the overflow valve with a standard trigger gun.

Circuit Diagram

HD 6/16 Circuit Diagram

HD 7/18, HD 9/19 Circuit Diagram

HD 9/20 Circuit Diagram

Torques

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