Stihl RE 109 - User Manual

Questions and Answers

S
Sandra RobertsonAug 19, 2025
Why does my Stihl RE 109 pressure fluctuate or drop?
- J
  Joseph BrownAug 20, 2025
  If the pressure fluctuates or drops in your Stihl Pressure Washer, it could be due to several reasons. First, ensure that the water supply is sufficient by completely opening the water tap and complying with the permissible suction lift if you are using suction mode. Check and clean the high-pressure nozzle in the spray head, the water intake strainer in the pump inflow, or the nozzle, as they might be dirty or clogged. If the issue persists, the high-pressure pump may be leaky, or the valves may be defective.
J
Jeffrey SalazarAug 21, 2025
How to fix a Stihl Pressure Washer motor that hums but doesn't run?
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  matthew89Aug 21, 2025
  If your Stihl Pressure Washer's motor hums but doesn't run when switched on, it could be due to several reasons. Ensure the mains voltage is adequate and the electrical connections, plug, cable, and switch are in good condition. If you're using an extension cord, make sure it has a sufficient cross-section and isn't too long. Also, check if the mains circuit-breaker has been tripped—if so, switch off the machine, actuate the spray gun until water only drips out, engage the safety catch, and then reset the circuit-breaker. Finally, make sure to actuate the spray gun when switching on the machine.
J
Jonathan HarrisAug 25, 2025
Why does my Stihl RE 109 Pressure Washer motor keep switching on and off?
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  Robert GomezAug 25, 2025
  If the motor of your Stihl Pressure Washer constantly switches on and off, it's possible that the high-pressure pump or spray attachment is leaky.
D
David StevensAug 26, 2025
What to do if my Stihl Pressure Washer engine stops?
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  Laurie LeonAug 26, 2025
  If your Stihl Pressure Washer engine stops, it might be due to the motor overheating. Ensure that the supply voltage matches the machine voltage. Allow the motor to cool down for at least 5 minutes before restarting.
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Kathy WilsonAug 27, 2025
Why is my Stihl RE 109 not dispensing detergent?
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  Rhonda SimonAug 27, 2025
  If your Stihl Pressure Washer is not supplying detergent, check if the detergent tank is empty and fill it if necessary. Also, inspect the detergent intake for any clogs and eliminate them.
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markhutchinsonAug 29, 2025
How to troubleshoot a Stihl Pressure Washer when the motor hums but doesn't run?
- J
  Jason YoungAug 30, 2025
  If the motor of your Stihl Pressure Washer does not run but hums when switched on, it could be due to several reasons. First, check the electrical connection, plug, cable, and switch, as the mains voltage might be too low or improper. If you're using an extension cord, ensure it has a sufficient cross-section. Avoid overly long extension cords; try connecting the machine directly or with a shorter cord. Also, the mains circuit-breaker might have tripped. In this case, switch off the machine, actuate the spray gun until water only drips out, engage the safety catch, and reset the breaker. Finally, make sure to actuate the spray gun when switching on the machine.
R
Ronald BrennanSep 1, 2025
What to do if my Stihl Pressure Washer is not dispensing detergent?
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  Martha HardinSep 1, 2025
  If your Stihl Pressure Washer is not supplying detergent, the detergent tank might be empty; refill it. Also, the detergent intake could be clogged, so eliminate any blockage.
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Fernando HermanSep 2, 2025
Why does my Stihl Pressure Washer engine keep stopping?
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  Mr. Jared NguyenSep 2, 2025
  If the engine of your Stihl Pressure Washer stops, the machine might be switching off because the motor is overheating. To resolve this, check whether the supply voltage and machine voltage match. Allow the motor to cool down for at least 5 minutes.
S
Shannon BarrettSep 5, 2025
How to fix weak jet on Stihl RE 109?
- E
  Emily HudsonSep 5, 2025
  If the jet from your Stihl Pressure Washer is weak, ragged, or unclean, the nozzle may be fouled. Clean the nozzle following the instructions in the "Maintenance" section.
A
Ashley ClarkeSep 7, 2025
Why does the pressure fluctuate or drop on my Stihl RE 109?
- A
  Ariel NelsonSep 7, 2025
  If you notice the pressure from your Stihl Pressure Washer fluctuating or dropping, several factors could be responsible. Ensure that the water supply is adequate by fully opening the water tap and complying with the permissible suction lift, especially in suction mode. Inspect the high-pressure nozzle in the spray head for dirt and clean it if necessary. Also, check the water intake strainer in the pump inflow for clogs and clean it. If the high-pressure pump is leaky or the valves are defective, have the machine checked by a servicing dealer.

Summary

Safety Precautions and Working Techniques

General Safety Advice

Crucial safety guidelines for operation, including user responsibility and supervision.

Clothing and equipment

Recommends protective clothing and footwear for safe operation.

Electrical connection safety

Crucial safety guidelines for electrical connections and extension cords.

Detergents

Guidelines for using detergents, including warnings and precautions.

Before starting work

Checks and preparations required before operating the machine.

During operation

Key instructions and warnings for safe machine operation.

After finishing work

Steps to take after completing the cleaning task.

Accessories and Spare Parts

Approved Accessories

Emphasizes using approved hoses and parts for machine safety.

Water filter

Information about the water filter accessory.

Backflow preventer

Explanation of the backflow preventer function.

Maintenance and repairs

General Maintenance and Repair Advice

Guidelines and warnings for maintenance and repair work.

User Maintenance and Repair Guidelines

Guidelines on user maintenance, repairs, and spare parts.

Assembling the Unit

Handle Assembly

High-pressure Hose Holder

Hose Reel Crank

Guide Clip Fitting

Flat Hose Cassette Holder

Flat Hose Cassette Holder Fastening

Water Inlet Connection

Fitting, Removing Spray Lance

Spray Lance Operation

Spray Nozzle Handling

Fitting, Removing High-Pressure Hose

Connecting High-Pressure Hose

Disconnecting High-Pressure Hose

High-Pressure Hose and Spray Gun

Hose Fitting to Gun

Hose Removal from Gun

Connecting the Water Supply

Water Hose Connection

Connecting to the Drinking Water Main

Water Main Connection Requirements

Connecting to a Pressureless Water Supply

Suction Operation Setup

Switching On in Suction Mode

Steps for switching on the machine in suction operation.

Connecting to Power Supply

Extension Cord Guidelines

Guidelines for selecting and using extension cords.

Power Supply Socket Connection

Steps for connecting the machine to the power supply socket.

Switching On

Machine Startup Procedure

Procedure for turning on the machine and setting standby mode.

Working

Spray Gun Operation

How to operate the spray gun and start/stop the engine.

Standby Mode Usage

High-Pressure Hose Handling

Adding Detergent

Detergent Container Filling

Instructions for filling and using the detergent container.

Post-Use Detergent System Cleaning

Tips for Operation

Pressure and Throughput Effects

Nozzle Selection and Use

Fan-Jet Nozzle Operation

Rotary Nozzle Operation

Cleaning Very Dirty Surfaces

Detergent Application Guidance

Switching Off

Machine Shutdown Procedure

Procedure for turning off the machine and depressurizing the system.

Storing the Machine

Machine Storage Guidelines

Guidelines for storing the machine, including frost protection.

Maintenance and Care

Maintenance Schedule Overview

Table outlining maintenance intervals for various machine parts.

Maintenance

Nozzle Cleaning

Water Intake Screen Cleaning

Specifications

Model Versions Overview

Electrical Specifications

Technical details regarding power supply and output.

Hydraulic Specifications

Technical details regarding working pressure and water flow.

Dimensions

Weight Specifications

Troubleshooting

Common Faults and Remedies

Table of common faults, causes, and remedies.

Detergent Supply Issues

Stihl RE 109 Specifications

General

Operating Pressure	100 bar
Maximum Pressure	120 bar
Water Throughput	440 l/h
Maximum Water Supply Temperature	40 °C
Hose Length	7 m
Power Cable Length	5 m
Sound Power Level	85 dB(A)