Stihl RE 961 - User Manual

Questions and Answers:

A
Andrea KimJul 31, 2025
Why is my Stihl RE 961 Pressure Washer motor humming but not running?
- V
  vjohnsonJul 31, 2025
  The Stihl Pressure Washer motor may hum but not run due to several reasons. Ensure the power cord is properly plugged into the wall socket and that the mains voltage is correct. Check the electrical connection, plug, cable, and switch for any issues. If you're using an extension cord, make sure it has a sufficient cross-section. Try connecting the machine directly without an extension cord. Also, the mains circuit-breaker might have been tripped. In that case, switch off the machine, actuate the spray gun until water only drips out of the head, engage the safety catch, and reset the mains circuit-breaker. Finally, make sure to actuate the spray gun when switching on the machine.
R
Richard BallAug 4, 2025
Why does my Stihl RE 961 Pressure Washer have fluctuating pressure?
- A
  alexanderknightAug 4, 2025
  Fluctuating or dropping pressure in your Stihl Pressure Washer can be due to several factors. First, ensure a sufficient water supply by fully opening the water tap and using a 3/4" hose. Check if the high-pressure nozzle in the spray head is dirty and clean it if necessary. Also, the high-pressure nozzle might be worn and need replacement. Clean the screens in the intake of the water tank or high-pressure pump if they are clogged.
D
Dr. Emily Espinoza DDSAug 9, 2025
What to do if my Stihl RE 961 is not dispensing detergent?
- A
  Amanda BaileyAug 9, 2025
  If your Stihl Pressure Washer is not dispensing detergent, start by checking if the detergent tank is empty and fill it if needed. Inspect the detergent tank for any sludge and clean it. Ensure there is no air in the system by setting the detergent metering valve to the minimum setting, bleeding air out of the high-pressure pump, and checking the hose from the metering system to the water tank. Also, check the pick-up body for clogs and clean it. Finally, inspect the detergent intake for fouling or defects; clean or repair it as necessary.
T
Thomas CoxAug 13, 2025
Why does my Stihl RE 961 run erratically?
- M
  Michele DicksonAug 13, 2025
  If your Stihl Pressure Washer is running erratically, it might be due to the high-pressure pump taking in air from an empty detergent tank. Set the detergent metering valve to the minimum setting and bleed air out of the high-pressure pump by removing the spray lance and operating the spray gun until the air has escaped.
J
jose69Aug 17, 2025
What to do if my Stihl RE 961 Pressure Washer motor stops?
- J
  joseph40Aug 17, 2025
  If the motor of your Stihl Pressure Washer stops, it may be due to overheating. Check whether the supply voltage matches the machine's voltage. Allow the motor to cool down for at least 5 minutes.
C
Carrie MarshallAug 21, 2025
Why is the burner on my Stihl Pressure Washer clogged with soot?
- J
  Jacob RichAug 21, 2025
  If the burner on your Stihl Pressure Washer is clogged with soot, it could be due to contaminated fuel. Try using clean fuel.
R
Ricky OwensAug 26, 2025
Why does my Stihl RE 961 Pressure Washer have a weak jet?
- J
  John GonzalezAug 26, 2025
  If your Stihl Pressure Washer has a weak, ragged, or unclean jet, it is possible that the high-pressure nozzle in the spray head is dirty. Clean the high-pressure nozzle.

Stihl RE 961 Specifications

General

Power Source	Electric
Max Pressure	135 bar
Motor Power	2.3 kW
Operating Pressure	120 bar
Power Consumption	2.3 kW
Power Cable Length	5 m

Summary

Guide to Using this Manual

Pictograms Explained

Explanation of symbols used in the manual and on the machine.

Textual Symbols and Warnings

Explains warning and caution symbols found within the text.

Engineering and Design Updates

STIHL's commitment to product development and potential design changes.

Safety Precautions and Working Techniques

Key Safety Guidelines

Essential safety guidelines and best practices for operating the machine.

Accessories and Spare Parts

Approved Parts and Modifications

Information on recommended and approved accessories and parts for safety and performance.

Physical Suitability Requirements

Operator Fitness Criteria

Requirements for the operator's physical and mental fitness to use the machine.

Applications and Limitations

Intended Uses and Restrictions

Intended uses and limitations of the high-pressure cleaner.

Clothing and Equipment Recommendations

Recommended Protective Gear

Recommended personal protective equipment (PPE) for safe operation.

Transporting the Machine Safely

Safe Transport Guidelines

Guidelines for safely securing and transporting the machine.

Detergent Usage and Handling

Suitable Detergents and Application

Information on suitable detergents and their use.

Before Starting Work Procedures

Pre-Operation Checks

Preparatory steps and checks before operating the machine.

Inspecting the High-Pressure Cleaner

Pre-Use Machine Checks

Checks to perform on the machine before operation to ensure it's in working order.

Electrical Connection Safety

Safe Power Supply Hookup

Guidelines for safely connecting the machine to the power supply.

During Operation Safety

Safe Working Practices

Operational guidelines and safety precautions during use.

Safety Equipment Function

Machine Safety Valve Explanation

Explanation of the machine's safety valve and its function.

After Finishing Work

Post-Operation Procedures

Steps to take after completing the work.

Before Leaving the Machine

Shutdown and Securing Procedures

Final checks and shutdown procedures before leaving the machine.

Maintenance and Repairs Overview

User Serviceable Tasks

Guidelines for performing user-level maintenance and repair tasks.

Assembling the Unit

PLUS Model Assembly Instructions

Specific assembly steps applicable only to PLUS model variants.

Locking the Machine in Position

Securing the Unit

How to secure the machine to prevent movement during operation or storage.

Filling the Fuel Tank

Fueling Procedure

Step-by-step guide for safely filling the fuel tank.

Opening Shroud and Covers

Main Shroud Opening

Detailed steps for opening the main shroud.

Additional Cover Opening

Detailed steps for opening an additional cover.

Adding Scale Inhibitor

Mixing Scale Inhibitor with Water

Guidance on how to properly mix scale inhibitor with water based on hardness.

Filling with STIHL Scale Inhibitor

Scale Inhibitor Tank Filling

Specific instructions for filling the scale inhibitor storage tank.

Fitting and Removing Spray Lance

Spray Lance Attachment;Detachment

Procedures for attaching and detaching the spray lance.

Fitting and Removing High-Pressure Hose

Hose Connection;Disconnection

Procedures for connecting and disconnecting the high-pressure hose.

Machines Without Hose Reel

Specific instructions for machines that do not have an integrated hose reel.

Disconnecting the High-Pressure Hose

Hose Reel Disconnection

Detailed steps for safely disconnecting the high-pressure hose from the reel.

High-Pressure Hose and Spray Gun

Hose and Gun Connection

How to connect the high-pressure hose and spray gun.

Hose and Gun Disconnection

How to disconnect the high-pressure hose from the spray gun.

Connecting the Water Supply

Water Source Hookup

Steps for connecting the machine to a water source.

Connecting to Power Supply

Power Outlet Connection

Specifics on plugging the power cord into the socket.

Switching On the Machine

Starting the Machine

Step-by-step guide for starting the high-pressure cleaner.

Cold-Water Operation Start

How to start and operate the machine in cold water mode.

Hot-Water Operation

Hot Water Mode Start

Instructions for operating the machine in hot water mode.

Setting the Temperature

Temperature Adjustment for Hot Water

How to adjust the operating temperature for hot water mode.

Control Panel Display Indicators

Machine Operational Status

Indicates the machine is ready for use.

Water Supply Issues

Troubleshooting low water flow or supply interruptions.

Detergent Tank Empty Alert

Indicates the detergent tank needs refilling or valve adjustment.

Scale Formation Warning

Warning about scale buildup requiring service.

Low Fuel Level Indicator

Indicates the fuel level is low.

Low Scale Inhibitor Alert

Alerts that the scale inhibitor is running low.

Maintenance Due Notification

Notification that scheduled maintenance is approaching or due.

Low Pump Oil Level Warning

Warning about critically low pump oil level.

Diagnostic Codes and Remedies

Flow Sensor Fault

Indicates an issue with the flow sensor, possibly requiring dealer service.

Low Water Flow or Supply

Alerts to low water flow or supply problems, requiring water flow adjustment.

Detergent Tank Empty or Valve Issue

Signals an empty detergent tank or incorrect valve setting.

Scale Buildup Detected

Indicates scale buildup requiring professional service.

Low Fuel Level Alert

Notifies that the fuel level is low.

Motor Overheating Warning

Warning that the motor has overheated and needs to cool down.

Machine Overheating Alert

Similar to motor overheating, indicates the machine needs cooling.

Water Feed Filter Blockage

Alerts to a clogged water filter needing cleaning.

Hose or Connection Leak

Indicates a leak in the hose or connections requiring service.

Pump Leak or Air Intake

Signals a leak in the pump or air intake issues.

Impermissible Operating State

Error related to improper operation or short-term cycles.

Clogged Flame Sensor

Warning about a dirty flame sensor needing cleaning.

Ignition or Fuel System Fault

Indicates issues with the ignition or fuel system.

Burner Malfunction

General burner malfunction.

Low Pump Oil Level Alert

Notifies that the pump oil level is critically low.

Temperature Sensor Error

Indicates issues with temperature sensors.

Microprocessor Control Error

Signals a critical error in the machine's control unit.

Working with the Machine

Actuating the Spray Gun

How to operate the spray gun trigger and safety latch.

Standby Mode Operation

Standby Mode Guidelines

Guidelines for using standby mode and when to switch off the machine.

Pressure and Quantity Control

Machine Control Adjustments

How to adjust working pressure and water flow rate directly on the machine.

Spray Device Adjustments

How to adjust working pressure and water volume using the spray gun.

Standard Position Adjustment

Setting Maximum Pressure and Flow

Setting the lever to standard position for maximum pressure and flow.

Reduced Pressure and Flow Settings

Fine Increment Adjustments

Adjusting the lever for lower pressure and flow settings.

Pressure Control at the Nozzle

Nozzle Pressure Adjustment

How to adjust operating pressure directly at the nozzle.

High-Pressure Hose Care and Handling

Hose Handling and Protection

Care and handling instructions for the high-pressure hose.

PLUS Models Hose Reel Operation

Hot Water Hose Reel Use

Specific hose reel instructions for PLUS models during hot-water operation.

Storing Accessories

Accessory Storage Guidance

Guidance on how to store accessories, power cable, and hose.

Adding Detergent to the Machine

Detergent Tank Filling

Step-by-step guide for adding detergent to the machine.

Detergent from Tank A

Tank A Detergent Addition

Instructions for adding detergent from the primary tank (A).

Detergent from Container B

Container B Detergent Addition

Instructions for adding detergent from the secondary container (B).

Rinse Detergent System

Detergent System Flushing

How to rinse the detergent system after use or when switching tanks.

Calculating Detergent Concentration

Precise Concentration Setting

Methods for accurately measuring and setting the detergent concentration.

Cleaning Process with Detergent

Effective Detergent Application

How to apply detergent effectively for cleaning.

Calculating Actual Detergent Concentration

Concentration Calculation Methods

Formulas and steps to calculate the actual detergent concentration.

Calculating Detergent Predilution

Predilution Ratio Calculation

How to calculate the initial dilution ratio of the detergent.

Steam Cleaning Mode Operation

Steam Mode Operation

Instructions for operating the machine in steam cleaning mode.

Switching Off the Machine

Machine Shutdown Procedure

Procedures for safely shutting down the machine.

Storing the Machine

Frost Protection Storage

Steps to take if the machine cannot be stored in a frost-free environment.

After Use Procedures

Final Steps After Operation

Final steps after using the machine.

Maintenance and Care Schedule

Complete Machine Inspection

Visual inspection for leaks and overall condition.

Pump Oil Check and Change

Procedures for checking and changing the pump's oil level.

Hose Connectors and Couplings Maintenance

Greasing and cleaning of hose connectors and couplings.

Ignition and Fuel Components Maintenance

Cleaning of ignition system, fuel tank, solenoid valve, and nozzles.

Water Intake and Nozzle Cleaning

Cleaning of water intake screens and high-pressure nozzles.

Ventilation and Heat Exchanger Cleaning

Maintaining clean ventilation openings and heat exchanger.

Descaling the Machine

When and how to descale the machine, especially for hot-water operation.

Maintenance Procedures

Pre-fitting Cleaning of Components

Rinsing hoses and accessories before fitting them.

High-Pressure Nozzle Cleaning

How to clean a clogged high-pressure nozzle to maintain pump pressure.

Water Intake Screen Cleaning

How to clean the two screens in the water inlet.

Screen on Water Tank

Specific instructions for cleaning the screen located on the water tank.

Screen at Pump Inlet

Specific instructions for cleaning the screen at the pump inlet.

Fuel Filter Cleaning or Replacement

Steps for cleaning or replacing the fuel filter.

Clean Flame Sensor

How to clean the flame sensor when it gets clogged with soot.

Checking the Oil Level

Pump Oil Level Check

Procedure for checking the oil level in the high-pressure pump.

Oil Change Procedure

High-Pressure Pump Oil Change

Detailed instructions for performing an oil change on the high-pressure pump.

Clean Ventilation Openings

Cooling Air Inlet Cleaning

How to keep the machine's cooling air inlets clean for proper operation.

Lubricate Connections

Hose Connection Lubrication

Guidance on lubricating connections for the high-pressure hose.

Minimize Wear and Avoid Damage

Preventing Machine Damage

Best practices to reduce wear and prevent damage to the machine.

Maintenance Work Overview

Periodic Maintenance Tasks

General note on periodic maintenance tasks.

Parts Subject to Wear and Tear

Wear Part Identification

Identification of common wear parts that may need replacement.

Expansion Tank Oil Fill

Filling Expansion Tank with Oil

How to open the expansion tank for oil filling.

Main Parts Identification

Machine Component Diagram and List

Diagram and list identifying the main components of the machine.

Control Panel Components Overview

Control Panel Diagram and Labels

Diagram and list identifying the control panel components.

Technical Specifications

Electrical Specifications

Details on power supply, output, amperage, and protection class.

Hydraulic Specifications

Details on working pressure, water flow, and kickback force.

Burner Specifications

Specifications related to the burner capacity and fuel tank.

Machine Dimensions

Physical dimensions of the machine.

Weight Specifications

Machine Weight Details

Weight specifications for the machine with spray attachment and hose.

REACH Regulation Information

REACH Compliance Overview

Information regarding the REACH regulation for chemical substances.

Special Accessories

Pipe Cleaning Kit Instructions

Details and instructions for using the pipe cleaning kit.

Other Special Accessories

Brush Accessories

Listing of other available accessories like brushes.

Spray Lance Options

Straight Spray Lance Variants

Various lengths available for straight spray lances.

Angled Spray Lance Details

Details on the angled spray lance and safety advice.

Nozzle Options and Use

Pencil-Jet Nozzle Description

Description of the pencil-jet nozzle for focused cleaning.

High-Pressure Nozzle Types

Information on available high-pressure nozzle angles.

Steam Nozzle Use

Specific nozzle for steam cleaning applications.

Rotary Nozzle with Spray Lance

Description of the rotary nozzle for tackling stubborn dirt.

Hose and Adapter Options

High-Pressure Hose Extension

Details on extensions for the high-pressure hose.

High-Pressure Hose Adapter

Adapter for connecting different hose types.

General Accessory Adapter

General adapter for various accessories.

Specialized Cleaning Attachments

Sand and Wet-Blasting Unit

Accessory for sand and wet blasting applications.

Water Filter Accessory

Accessory for purifying tap water.

Handling and Transport Accessories

Central Screw-on Tube

Part for attaching a jack ring.

Jack Ring for Transport

Accessory for transporting the cleaner with a crane.

Troubleshooting Common Faults

Motor Not Running (Humming)

Troubleshooting steps for a motor that hums but doesn't start.

Pressure Fluctuations or Drops

Diagnosing and fixing issues with fluctuating or low pressure.

Machine Runs Erratically

Identifying causes for the machine operating inconsistently.

Spray Gun Not Actuated

Troubleshooting if the spray gun is not operating.

Troubleshooting Continued Issues

Machine On;Off Cycling

Diagnosing why the machine cycles on and off when the spray gun is closed.

Motor Stops During Operation

Troubleshooting reasons why the motor might stop during operation.

Detergent Supply Issues

Resolving issues related to detergent not being supplied.

Burner Clogged with Soot

How to address a burner clogged with soot.

Weak or Ragged Spray Jet

Identifying causes for a poor quality spray jet.

Maintenance and Repairs Policy

User vs. Dealer Service

Overview of user-serviceable tasks and when to consult a dealer.

Product Disposal Instructions

Environmentally Friendly Disposal

Environmentally sound disposal instructions for the machine and accessories.

EC Declaration of Conformity

Compliance with EU Directives

Official document confirming compliance with EU directives.

Measured Sound Power Levels

Measured sound power levels for different models.

Guaranteed Sound Power Level

Sound Power Level Data

Guaranteed sound power levels for the machine models.

Quality Certification Information

ISO 9001 Quality Management

Information about STIHL's quality management system certification.

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