Kärcher HDS 3.5/20 Ed Cage - User Manual

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MODEL ORDER #

HDS 2.0/10 Ed Cage 1.575-511.0

HDS 1.9/15 Ed Cage 1.575-512.0

HDS 3.5/20 Ea Cage 1.575-513.0

9.800-191.0

OPERATOR’S MANUAL

To locate your local Kärcher Commercial Pressure Washer Dealer nearest you,

visit www.karchercommercial.com

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Questions and Answers

J
Jessica GutierrezAug 4, 2025
How to fix low operating pressure on Kärcher HDS 3.5/20 Ed Cage?
- C
  Christopher MeltonAug 4, 2025
  Low operating pressure in your Kärcher Pressure Washer can stem from several issues. It might be a faulty pressure gauge, which would need replacing with a new one. An insufficient water supply requires using a larger garden hose and cleaning the filter washer at the water inlet. An old, worn, or incorrect spray nozzle should be matched to the machine's specifications or replaced. Leaks in the plumbing or hose necessitate checking the plumbing system and re-taping leaks with Teflon tape. A faulty or mis-adjusted unloader valve needs adjustment for proper pressure, and a repair kit might be needed. Worn packing in the pump requires installing a new packing kit. Finally, folded or dirty inlet or discharge valves in the pump need cleaning, or worn valves should be replaced with a valve kit.
D
dawn12Aug 8, 2025
Why is my Kärcher HDS 3.5/20 Ed Cage not drawing detergent?
- E
  erobinsonAug 8, 2025
  If your Kärcher Pressure Washer isn't drawing detergent, several factors could be the reason. It could be due to an air leak, so check and tighten all clamps and inspect detergent lines for any holes. The valve in the injector head might be blocked, dirty, or damaged, requiring cleaning or replacement. A plugged filler screen on the detergent suction hose may also be the culprit, so clean or replace it. Dried-up detergent plugging the metering valve needs thorough disassembly and cleaning. High detergent viscosity requires dilution to specifications. Other potential causes include a hole in the detergent line needing repair, a low detergent level needing replenishment, or a discharge water temperature exceeding 180° F, which necessitates lowering the water temperature.
C
clarkjamieAug 13, 2025
What to do if Kärcher Pressure Washer pressure is fluctuating?
- C
  cameronmillerAug 13, 2025
  If your Kärcher Pressure Washer's pressure is fluctuating, several issues could be responsible. Worn valves may need checking and replacement. A blockage in the valve may also require checking and replacement. The pump might be sucking air, so check the water supply and air at joints in the suction line. Finally, worn piston packing might need checking and replacement.
J
jeffreymcdowellAug 16, 2025
Why is the pressure low on my Kärcher HDS 3.5/20 Ed Cage Pressure Washer after installation?
- M
  Michael RyanAug 17, 2025
  If your Kärcher Pressure Washer pump runs normally but the pressure is low after installation, consider these potential causes. The pump might be sucking air, requiring a check of the water supply. Valves could be sticking, needing inspection, cleaning, or replacement. A faulty unloader valve seat may need checking and replacement. An incorrectly sized nozzle should be checked against the serial plate for proper sizing and replaced if necessary. Lastly, worn piston packing may also need checking and replacement.
J
Jonathan SuarezAug 21, 2025
Why is my Kärcher Pressure Washer pump so noisy?
- R
  Rachel MoyerAug 21, 2025
  A noisy pump in your Kärcher Pressure Washer can be attributed to several reasons. Air in the suction line requires checking the water supply and connections. Broken or weak inlet or discharge valve springs need inspection and possible replacement. Excessive matter in the valves necessitates checking and cleaning. Finally, worn bearings should be checked and replaced if necessary.
D
danielsjoannaAug 26, 2025
What causes the water temperature to be too hot on my Kärcher Pressure Washer?
- S
  Sara DiazAug 26, 2025
  If the water temperature is too hot in your Kärcher Pressure Washer, it could be due to several factors. The incoming water to the machine might be warm or hot, so lower the incoming water temperature. The fuel pump pressure could be too high, so lower the fuel pressure. A defective fuel pump should be replaced. The detergent line sucking air requires tightening all clamps and checking the detergent line for holes. A defective high limit switch (thermostat) needs replacement. Insufficient water supplied requires checking the GPM to the machine. Restricted water flow requires checking the nozzle for obstruction and proper size.
B
Brandon AdamsAug 29, 2025
How do I fix low water temperature on my Kärcher Pressure Washer?
- B
  Brandon LynchAug 29, 2025
  Low water temperature in your Kärcher Pressure Washer can be caused by several factors. Improper fuel or water in the fuel requires draining the fuel tank and replacing it with the correct fuel. Low fuel pressure necessitates increasing the fuel pressure. A weak fuel pump requires checking the fuel pump temperature and replacing the pump if needed. A partially clogged fuel filter should be replaced as needed. Soot build-up on the coils requires cleaning the coils with soot remover. Lime build-up on the coils requires cleaning the inside of the coils using coil cleaner. An improper burner nozzle requires calling technical service for the proper size.

Summary

Operators Manual & Model Information

Model and Order Numbers

Lists the available models and their corresponding order numbers for the pressure washer.

Introduction & Safety

Owner Responsibility & Save Instructions

Outlines the owner's duties and advises to keep manual for future reference.

Important Safety Warnings

Details critical safety guidelines to prevent injury, death, or property damage.

Installation and Location

Provides guidance on proper placement and environmental considerations for the machine.

Component Identification

Machine Components Overview

Identifies and labels key parts of the pressure washer assembly.

Operating Instructions

Starting, Operating, and Stopping

Step-by-step guide for safely starting, using, and shutting down the pressure washer.

Detergent Injector Usage

Instructions on how to use the detergent injector for cleaning applications.

Maintenance & Service

Preventative Maintenance Tasks

Lists routine checks and cleaning procedures for optimal performance.

Winterizing and Pump Care

Procedures to protect the machine from freezing and maintain the pump.

Burner System Service

Guidance on maintaining the burner, fuel system, and adjusting air flow.

Exploded Views & Parts Lists

Left Side Exploded View

Visual breakdown of the left side of the pressure washer assembly.

Right Side Exploded View

Visual breakdown of the right side of the pressure washer assembly.

Exploded Views Parts List

Comprehensive list of parts with part numbers for the machine.

Control Panel Exploded View & Parts

Details components of the control panel, including switches, indicators, and labels.

Hose & Spray Gun Exploded View & Parts

Lists parts for the high-pressure hose, spray gun, and detergent injector assembly.

Downstream Injector Exploded View & Parts

Visual breakdown and part list for the downstream detergent injector.

Unloader Exploded View & Parts

Exploded views and part lists for the unloader valve assembly.

Pump Exploded View & Parts

Detailed exploded view and parts list for the pump assembly.

Repair Kit Information

Information on available repair kits for pump components.

Replacement Parts

Genuine KNA Replacement Parts

Lists genuine replacement parts for maintaining the Karcher machine.

Troubleshooting

Problem Diagnosis and Solutions

Guide to identify and resolve common operational issues with the pressure washer.

Maintenance Schedule

Preventative Maintenance Schedule

A schedule outlining recommended preventative maintenance tasks and intervals.

Oil Change Log

A section to record dates and operating hours for pump oil changes.

Kärcher HDS 3.5/20 Ed Cage Specifications

General

Type	Hot Water High-Pressure Cleaner
Max. Temperature	80 °C
Power Rating	3.5 kW
Fuel Tank	25 l
Voltage	400 V
Frequency	50 Hz
Hose Length	10 m
Pressure	20 MPa

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