Husqvarna 525LS Mark II User Manual (English)

Justin SandersJul 29, 2025

Why Husqvarna 525LS Mark II engine does not start?

J
Justin KimJul 29, 2025
If your Husqvarna Chainsaw engine won't start, several factors could be the cause. Here's what to check: * Ensure the stop switch is in the start position. * Make sure the starter pawls can move freely; if not, remove the starter cover and clean around them. * Verify you're using the correct fuel type; if not, drain the tank and refill. * Inspect the spark plug: it should be dry and clean. * Confirm the spark plug electrode gap is correct and that the plug has a suppressor. * Tighten the spark plug if it's loose. * Adjust the idle speed if it's incorrectly set. * Replace the fuel filter if it's clogged.

Brand	Husqvarna
Model	525LS Mark II
Category	Chainsaw
Language	English

Brand

Husqvarna

Model

525LS Mark II

Introduction and Product Overview

Product Overview

Visual guide to the product's components with numbered parts.

Product Description

Details the product's nature as a combustion engine grass trimmer.

Intended Use

Specifies the product's primary function is grass cutting and clearing.

Safety Information

Symbols and Warnings

Explains warning symbols and safety decals found on the product.

Safety Definitions

Defines key terms like WARNING and CAUTION for user understanding.

General Safety Instructions

Provides crucial general safety precautions for operating the product.

Operation Safety Instructions

Outlines specific safety measures to follow during product use.

Personal Protective Equipment (PPE)

Details essential PPE required for safe operation and injury prevention.

Product Safety Devices and Checks

Covers safety features and necessary checks for proper product functioning.

Muffler and Fuel Safety

Muffler Maintenance and Safety

Details inspection and maintenance of the muffler for noise and safety.

Fuel Safety Guidelines

Provides critical safety guidelines for handling and using fuel.

Assembly Procedures

Safety Instructions for Maintenance

Emphasizes safety precautions before performing any maintenance tasks.

Loop Handle Assembly

Detailed steps for attaching and adjusting the loop handle.

Cutting Attachment Guard and Trimmer Head Assembly

Instructions for fitting the cutting attachment guard and trimmer head.

Product Operation

Pre-Operation Checks

Essential checks to perform before starting the product operation.

Connectivity Features

Information on the product's connectivity capabilities and device installation.

Installing Connectivity Device

Step-by-step guide for installing the Husqvarna connectivity device.

Fueling Guidelines

Details on fuel types, mixing, and safety precautions for the two-stroke engine.

Mixing Fuel

Instructions and ratios for mixing gasoline and two-stroke oil.

Filling the Fuel Tank

Procedure for safely filling the product's fuel tank.

Preparing for Cold Start

Steps to prepare a cold engine for starting using the air purge bulb.

Starting the Product

Step-by-step guide for safely starting the product's engine.

Stopping the Product

Instructions for safely stopping the product's engine.

Surface Safety Precautions

Warnings about hot surfaces and electrical shock risks when operating.

Grass Trimming Techniques

Trimming the Grass

Specific steps and techniques for trimming grass.

Cutting the Grass

Guidance on how to cut grass correctly with the trimmer line.

Sweeping the Grass

Technique for using airflow to clear cut grass from an area.

Product Maintenance

Maintenance Schedule

Schedule detailing daily, weekly, and monthly maintenance tasks.

Adjusting Idle Speed

Procedure for adjusting the engine's idle speed.

Muffler Maintenance

Steps for maintaining the muffler, including spark arrestor screen.

Cooling System Maintenance

Instructions for cleaning and maintaining the product's cooling system.

Air Filter Maintenance

Steps for cleaning and replacing the air filter to ensure proper engine function.

Spark Plug Examination and Maintenance

Guidance on inspecting, cleaning, and replacing the spark plug.

Bevel Gear Inspection

Instructions for checking and greasing the bevel gear.

Troubleshooting Guide

Engine Does Not Start

Common causes and procedures for addressing engine starting issues.

Engine Starts But Stops Again

Troubleshooting steps for when the engine starts and then stops.

Transportation and Storage

Technical Specifications

Provides key technical data for the 525LS Mark II and 525LST Mark II models.

Warranty Information

Emissions Control Warranty Statement

Details the warranty coverage for exhaust and evaporative emissions control systems.

Warranty Rights and Obligations

Explains the owner's responsibilities and rights regarding the warranty.

Manufacturer's Warranty Coverage

Outlines the scope of the manufacturer's warranty for emissions control parts.

Owner's Warranty Responsibilities

Details the owner's duties for maintaining warranty validity.

What is Covered by Warranty

Specifies which parts and conditions are covered under the warranty.

What is Not Covered by Warranty

Lists conditions and parts excluded from warranty coverage.

How to File a Warranty Claim

Instructions on how to contact Husqvarna for warranty service and claims.

Where to Get Warranty Service

Information on finding authorized servicing dealers for warranty repairs.

Emission-Related Parts Maintenance

Guidelines for maintenance and repair of emission control components.

Maintenance Statement

Clarifies owner's responsibility for performing required maintenance.

Husqvarna 525LS Mark II User Manual

Table of Contents

Questions and Answers:

Husqvarna 525LS Mark II Specifications

Summary