Husqvarna 331R User Manual (English)

Other manuals for Husqvarna 331R

Questions and Answers:

D
Daniel NealAug 21, 2025
Why is my Husqvarna Brush Cutter engine not easy to start?
- S
  Sierra LindseyAug 21, 2025
  If your Husqvarna Brush Cutter engine is hard to start, several factors could be at play. Start by checking the fuel system: the fuel filter or fuel hose might be blocked, or there could be air in the fuel pipes. Clean or replace the fuel filter, clear the fuel hose, and bleed the air from the fuel pipes. Ensure you're using the correct fuel type. Additionally, the stop screw for the throttle may not be working correctly and needs repair. The issue might also stem from the needle valve; it could be defective, worn, blocked, or have an object in its groove, or its lever arm might be damaged or not operating correctly. In such cases, replace or adjust/repair the respective components.
D
David WheelerAug 22, 2025
Why is the idle speed unstable on my Husqvarna 331R Brush Cutter?
- B
  Brianna HigginsAug 22, 2025
  If the idle speed of your Husqvarna Brush Cutter is unstable, several factors could be responsible. The stop screw for the throttle may not be operating correctly, and requires repair. Check for a blocked fuel filter or fuel hose, and clean or replace them if necessary. Air in the fuel pipes can also cause this issue, so bleed the air from them. Ensure you are using the correct fuel type. The carburetor might not be correctly attached and needs reattaching. Issues with the needle valve, such as it being defective, worn, having an object in its groove, or its spring not being correctly attached, or its lever arm not operating correctly, can also cause unstable idle speed; replace or adjust/repair the respective components.
W
William RamosAug 25, 2025
What causes my Husqvarna 331R Brush Cutter engine to stop at idle speed?
- M
  Marcus McmillanAug 25, 2025
  If your Husqvarna Brush Cutter engine stops at idle speed, several potential issues could be the cause. The stop screw for the throttle might not be working properly and needs repair. A blocked fuel filter or fuel hose could also be the culprit; clean or replace them as needed. Air in the fuel pipes can also cause the engine to stop, so bleed them. Other potential causes include a defective heat insulation seal, a defective needle valve, a damaged or incorrectly adjusted lever arm of the needle valve, a damaged or incorrectly attached needle valve spring, a worn needle valve, or an object in the needle valve groove. Replace or adjust/repair the affected components accordingly.
P
Peter Snow Jr.Aug 27, 2025
Why won't my Husqvarna 331R Brush Cutter engine increase speed?
- M
  matthewaguilarAug 27, 2025
  If your Husqvarna Brush Cutter engine is not increasing in speed, check for a blocked fuel filter or fuel hose, and clean or replace if needed. Make sure there is no air in the fuel pipes, bleed them if needed. If the needle valve is defective replace it. Ensure the carburetor is correctly attached. The lever arm of the needle valve could be damaged, too low, or not operating correctly; in such case adjust or repair/replace it. Finally, verify that the needle valve spring is correctly attached and clear the needle valve if it is blocked.
T
Terry ScottAug 28, 2025
What to do if there is no spark in my Husqvarna Brush Cutter?
- R
  rhonda43Aug 28, 2025
  If your Husqvarna Brush Cutter has no spark, make sure the spark plug is dry and clean. Also, clean the spark plug and check that the electrode gap is correct. Ensure the spark plug is installed with a suppressor. Refer to technical data for the correct electrode gap.
C
Charles McdonaldAug 29, 2025
What to do if the air filter is clogged in my Husqvarna 331R?
- S
  sheila08Aug 29, 2025
  If the air filter in your Husqvarna Brush Cutter is clogged, clean the air filter.
S
Scott MerrittAug 31, 2025
What to do if the starter pawls are not working on my Husqvarna Brush Cutter?
- R
  Rachel CookAug 31, 2025
  If the starter pawls are binding on your Husqvarna Brush Cutter, adjust or replace the pawls. Also, clean around the pawls.
T
Tamara LewisSep 2, 2025
Why won't my Husqvarna Trimmer start? (Stop button issue)
- V
  vsimpsonSep 2, 2025
  To solve the stop button issue on your Husqvarna Trimmer, set the stop switch to the start position.
I
Isabel BishopSep 4, 2025
Why is my Husqvarna 331R performing poorly at high speed?
- B
  Billy ArcherSep 4, 2025
  If your Husqvarna Brush Cutter shows unsatisfactory performance at high speed, several issues could be the cause. Check for a blocked fuel filter or fuel hose, and clean or replace them as needed. Also, ensure there is no air in the fuel pipes by bleeding them. Verify that you are using the correct fuel type. The carburetor might not be attached correctly and needs reattaching. Problems with the needle valve, such as it being defective, worn, or having a damaged or incorrectly attached spring, or an object in its groove, or its lever arm being damaged or not operating correctly, can also lead to poor performance. Replace or adjust/repair the affected components accordingly.
T
tpalmerSep 5, 2025
Why does my Husqvarna 331R engine stop when I decrease the speed?
- B
  bradfordkimberlySep 6, 2025
  If the engine of your Husqvarna Brush Cutter stops when the speed is decreased, it could be due to the lever arm of the needle valve being too high or not operating correctly, requiring adjustment or repair. Alternatively, the needle valve might be worn and needs replacement, or there could be an object in the needle valve groove that needs to be removed.

Husqvarna 331R Specifications

General

Engine Type	2-stroke
Weight	5.2 kg
Sound Pressure Level	94 dB(A)
Fuel Tank Volume/Capacity	0.5 L
Recommended Cutting Equipment	Grass blade, trimmer head
Engine Displacement	30.1 cm³

Summary

Introduction to Husqvarna Brushcutter

Product Description

Describes the brushcutter and its primary function for grass trimming and clearing.

Intended Use Guidelines

Explains the proper applications for the brushcutter, specifying approved cutting attachments.

Product Overview and Components

Product Markings and Safety Information

Symbols on the Product

Explains the meaning of various safety symbols and warnings found on the product.

Product Liability Clause

Details conditions under which the manufacturer is not liable for damages caused by the product.

Comprehensive Safety Instructions

Safety Definitions

Defines severity levels for safety signals like WARNING and CAUTION.

General Safety Guidelines

Provides essential safety guidelines for product operation, handling, and maintenance.

Operational Safety Procedures

Personal Protective Equipment (PPE)

Details necessary PPE for safe operation, including eye, ear, and foot protection.

Product Protective Devices

Highlights the importance of maintaining product protective features for safety.

Throttle Trigger Lockout Function

Explains the function of the throttle trigger lockout to prevent accidental acceleration.

Component Safety Checks

Quick-Release Mechanism Check

Outlines the procedure to verify the safety quick-release mechanism.

Cutting Attachment Guard Safety

Stresses the importance of using and checking the cutting attachment guard.

Muffler Safety Precautions

Describes the muffler's role and safety precautions related to its operation.

Cutting Attachment Installation Safety

Locknut Attachment and Removal

Provides instructions for securely attaching and removing cutting attachments using the locknut.

Cutting Equipment Selection

Discusses choosing and maintaining cutting attachments for optimal performance.

Trimmer Head Usage

Offers guidance on using trimmer heads and trimmer lines correctly.

Blade and Fuel Safety

Grass Blades and Cutters Safety

Details the use and safety precautions for grass blades and cutters.

Blade Thrust Explanation

Explains the phenomenon of blade thrust and associated risks.

Fuel Safety Procedures

Provides critical safety guidelines for handling and using fuel with the product.

Product Assembly Guide

Installing the Main Body

Step-by-step guide to connect the engine to the main tube.

Handlebar and Throttle Installation

Instructions for fitting the handlebar and clamp onto the shaft.

Throttle Cable and Stop Switch Connection

Procedure for connecting the throttle cable and stop switch wires to the carburettor.

Cutting Attachment Assembly

Installing Blades and Trimmer Heads

Guide on how to attach cutting blades and trimmer heads to the output shaft.

Blade Guard and Grass Blade Installation

Steps for attaching the blade guard and grass blade assembly.

Harness and Guard Assembly

Cutting Attachment Guard Bracket Installation

Instructions for mounting the bracket onto the cutting attachment guard.

Trimmer Guard and Head Attachment

Steps to attach the trimmer guard and connect the trimmer head to the shaft.

Transport Guard Installation

Guide on how to attach the transport guard for blades.

Harness Adjustment Procedure

Instructions for properly adjusting the harness for comfortable and safe operation.

Product Operation and Fueling

Fueling Safety Precautions

Safety precautions and guidelines for using fuel with the product.

Gasoline Specifications

Specifics on the type of gasoline to use and warnings about its use.

Fuel Mixture and Starting Procedures

Making the Fuel Mixture

Instructions for correctly mixing gasoline and two-cycle engine oil.

Adding Fuel Safely

Safety procedures for refuelling the product.

Starting a Cold Engine

Detailed steps for starting the engine when it is cold.

Engine Operation and Work Practices

Starting a Warm Engine

Instructions for starting the engine when it is already warm.

Operating the Grass Trimmer

Guidance on how to operate the grass trimmer effectively.

General Work Instructions

Provides general advice for efficient and safe operation.

Cutting Techniques

Clearing Grass with Blade

Techniques for clearing grass using the grass blade attachment.

Area Clearing Tips

Tips for clearing an area effectively with the trimmer.

Trimming Grass Instructions

Instructions on how to trim grass using the trimmer head.

Cutting and Maintenance Procedures

Cutting Grass Effectively

Steps for cutting grass using the trimmer line.

Sweeping Cut Grass

Using trimmer airflow to clear cut grass from an area.

Replacing Trimmer Line

Reference for instructions on how to replace the trimmer line.

Maintenance Schedule Overview

A schedule outlining daily, weekly, and monthly maintenance tasks.

Carburetor, Muffler, and Idle Speed Adjustments

Carburetor Adjustment Guide

Instructions for adjusting the carburetor, recommended for trained technicians.

Muffler Inspection

Procedures for inspecting the muffler for damage and proper attachment.

Idle Speed Adjustment

Guide to setting the correct idle speed for the engine.

Cooling System and Air Filter Care

Cooling System Components

Explains the cooling system components and their function.

Cleaning the Cooling System

Steps for cleaning the product's cooling system to prevent overheating.

Air Filter Information

Information on the air filter and its cleaning intervals.

Cleaning the Air Filter

Detailed instructions for cleaning and maintaining the air filter.

Fuel Filter and Blade Sharpening

Fuel Filter Check

Guidance on checking and maintaining the fuel filter.

Bevel Gear Lubrication

Instructions for properly lubricating the bevel gear.

Sharpening Cutting Attachments

Method for sharpening cutting attachments to maintain balance and performance.

Troubleshooting Common Issues

Starting Failures

Lists possible causes and solutions for engine starting failures.

Engine Stalling Issues

Addresses issues where the engine starts but stops unexpectedly.

Transportation and Storage Guidelines

Guidelines for safely transporting and storing the product.

Technical Specifications

Approved Accessories List

EC Declaration of Conformity

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Table of Contents

Other manuals for Husqvarna 331R

Questions and Answers:

Husqvarna 331R Specifications

Summary

Introduction to Husqvarna Brushcutter

Product Description

Intended Use Guidelines

Product Overview and Components

Product Markings and Safety Information

Symbols on the Product

Product Liability Clause

Comprehensive Safety Instructions

Safety Definitions

General Safety Guidelines

Operational Safety Procedures

Personal Protective Equipment (PPE)

Product Protective Devices

Throttle Trigger Lockout Function

Component Safety Checks

Quick-Release Mechanism Check

Cutting Attachment Guard Safety

Muffler Safety Precautions

Cutting Attachment Installation Safety

Locknut Attachment and Removal

Cutting Equipment Selection

Trimmer Head Usage

Blade and Fuel Safety

Grass Blades and Cutters Safety

Blade Thrust Explanation

Fuel Safety Procedures

Product Assembly Guide

Installing the Main Body

Handlebar and Throttle Installation

Throttle Cable and Stop Switch Connection

Cutting Attachment Assembly

Installing Blades and Trimmer Heads

Blade Guard and Grass Blade Installation

Harness and Guard Assembly

Cutting Attachment Guard Bracket Installation

Trimmer Guard and Head Attachment

Transport Guard Installation

Harness Adjustment Procedure

Product Operation and Fueling

Fueling Safety Precautions

Gasoline Specifications

Fuel Mixture and Starting Procedures

Making the Fuel Mixture

Adding Fuel Safely

Starting a Cold Engine

Engine Operation and Work Practices

Starting a Warm Engine

Operating the Grass Trimmer

General Work Instructions

Cutting Techniques

Clearing Grass with Blade

Area Clearing Tips

Trimming Grass Instructions

Cutting and Maintenance Procedures

Cutting Grass Effectively

Sweeping Cut Grass

Replacing Trimmer Line

Maintenance Schedule Overview

Carburetor, Muffler, and Idle Speed Adjustments

Carburetor Adjustment Guide

Muffler Inspection

Idle Speed Adjustment

Cooling System and Air Filter Care

Cooling System Components

Cleaning the Cooling System

Air Filter Information

Cleaning the Air Filter

Fuel Filter and Blade Sharpening

Fuel Filter Check

Bevel Gear Lubrication

Sharpening Cutting Attachments

Troubleshooting Common Issues

Starting Failures

Engine Stalling Issues