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Homelite UT10518 - User Manual

Homelite UT10518
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OPERATOR’S MANUAL
UT10517 / 18 in. 42cc Chain Saw
UT10518 / 18 in. 46cc Chain Saw
UT10520 / 20 in. 46cc Chain Saw
SAVE THIS MANUAL FOR FUTURE REFERENCE
Your chain saw has been engineered and manufactured to Homelite’s high standard for dependability, ease of operation,
and operator safety. When properly cared for, it will give you years of rugged, trouble-free performance.
WARNING: To reduce the risk of injury, the user must read and understand the operator’s manual before using
this product.
Thank you for buying a Homelite product.

Table of Contents

Questions and Answers

  • J
    Jeffrey BarkerAug 12, 2025
    Why Homelite UT10518 engine will not start?
    • J
      Jeremy SweeneyAug 13, 2025
      If your Homelite Chainsaw engine isn't starting, it could be due to no spark or a flooded engine. Try cleaning or replacing the spark plug and resetting the spark plug gap. If the engine is flooded, turn the ignition switch OFF, remove the spark plug, move the choke lever to the run position, and pull the starter cord 15 to 20 times to clear excess fuel. Then, clean and reinstall the spark plug. Set the ignition switch to the run position, push and fully release the primer bulb 7 times, and pull the starter three times with the choke lever at run. If it still doesn't start, move the choke lever to half choke and repeat. If the engine still fails to start, repeat procedure with a new spark plug.
  • R
    Rebecca BellAug 16, 2025
    What to do if Homelite Chainsaw engine does not reach full speed and/or emits excessive smoke?
    • K
      Kristopher HoffmanAug 16, 2025
      If your Homelite Chainsaw engine isn't reaching full speed or is emitting excessive smoke, the oil/fuel mixture might be incorrect, the air filter could be dirty, the spark arrestor screen might be dirty, or the carburetor may need adjustment. Use fresh fuel and the correct 2-cycle oil mix ratio. Clean the air filter. Clean the spark arrestor screen. Contact an authorized service center for carburetor adjustment.
  • J
    Jason BraunAug 20, 2025
    What to do if Homelite UT10518 Chainsaw bar and chain running hot and smoking?
    • T
      Tara MorrowAug 20, 2025
      If the bar and chain on your Homelite Chainsaw are running hot and smoking, it could be due to an empty chain oil tank, chain tension that is too tight, or a malfunctioning oiler. Ensure the oil tank is filled every time you fill the fuel tank. Adjust the chain tension. Run the saw at half throttle for 30 to 45 seconds, then stop it and check for oil dripping from the SAFE-T-TIP and guide bar. If oil is present, the chain may be dull or the bar may be damaged. If there is no oil on the SAFE-T-TIP, contact an authorized service center.
  • A
    Alexandria JohnsonAug 25, 2025
    What to do if Homelite UT10518 Chainsaw engine starts but will not accelerate properly?
    • D
      Deanna SmithAug 25, 2025
      If your Homelite Chainsaw engine starts but won't accelerate properly, it could be that the carburetor requires a “L” (Low Jet) adjustment. Contact an authorized service center for carburetor adjustment.
  • C
    christine21Aug 27, 2025
    What to do if Homelite UT10518 Chainsaw engine starts, then dies?
    • E
      Elizabeth BowmanAug 27, 2025
      If your Homelite Chainsaw engine starts but then dies, it might be because the carburetor requires a “L” (Low Jet) adjustment. Contact an authorized service center for carburetor adjustment.
  • G
    George HuntAug 31, 2025
    What to do if Homelite UT10518 engine starts but will not run properly at high speed?
    • J
      Joseph ReynoldsAug 31, 2025
      If your Homelite Chainsaw engine starts but doesn't run properly at high speed, the carburetor may require a “H” (High Jet) adjustment. Contact an authorized service center for carburetor adjustment.
  • C
    Crystal BlanchardSep 4, 2025
    What to do if Homelite UT10518 Chainsaw engine starts, runs, and accelerates but will not idle and chain turns at idle?
    • J
      Jeffrey SilvaSep 4, 2025
      If your Homelite Chainsaw engine starts, runs, and accelerates but won't idle and the chain turns at idle, it could be that the carburetor requires adjustment to idle speed or there's an air leak in the intake system. Turn the idle speed screw “T” clockwise to increase idle speed. Turn the idle speed screw “T” counterclockwise to decrease speed. Contact an authorized service center for a rebuild kit.
  • S
    Samantha NguyenSep 7, 2025
    What to do if Homelite Chainsaw engine starts and runs, but chain is not rotating?
    • M
      Michele JonesSep 8, 2025
      If your Homelite Chainsaw engine starts and runs, but the chain isn't rotating, check if the chain brake is engaged, the chain tension is too tight, the guide bar and chain are assembled incorrectly, the guide bar and/or chain are damaged, or the drive sprocket teeth are damaged. Release the chain brake. Adjust the chain tension. Inspect the guide bar and chain for damage. Contact an authorized service center for drive sprocket replacement.

Summary

Introduction to Homelite Chain Saw

General Safety Rules for Operation

Kickback Precautions

Information on preventing kickback and related injuries.

Safe Operation Guidelines

Guidelines for safe handling, grip, and cutting techniques.

Specific Safety Rules

Refueling Safety Precautions

Precautions and procedures for safe refueling.

Kickback Danger Explanations

Explains kickback and how to avoid serious personal injury.

Symbols Explained

Signal Words and Service Information

Glossary of Chain Saw Terms

Product Features and Specifications

Key Chain Saw Components Identification

Identification of major parts like primer bulb, choke lever, and handles.

Key Product Feature Explanations

Low Kickback Saw Chain Function

Explanation of how the low kickback chain minimizes kickback force.

Safe-T-Tip Anti-Kickback Nose Guard

Details on the nose guard's function to prevent kickback.

Assembly and Unpacking Procedures

Initial Operation Warnings

Crucial warnings before starting operation to prevent injury.

Fuel and Refueling Procedures

Oxygenated Fuels Information

Guidelines for using oxygenated fuels and their potential effects.

Fuel Tank and Oil Filling

Operating the Chain Brake

Instructions on how to engage and disengage the chain brake.

Starting the Engine

Engine Start Procedures by Temperature

Distinguishes starting procedures based on engine temperature.

Stopping the Engine

Adjusting Idle Speed and Cutting Techniques

Understanding Pull and Push Forces

Explains the forces involved in cutting with the bar's top and bottom edges.

Kickback Precautions and Grip

Proper Grip Position

Detailed explanation and illustration of correct and incorrect hand grips.

Cutting Stance and Work Area Safety

Basic Cutting Procedures

Steps for performing basic cuts, including throttle control.

Safe Tree Felling Procedures

Tree Felling Procedure Details

Step-by-step guide for felling trees, including notch and backcut.

Buttress Root Removal and Log Bucking

Bucking Log Safety Considerations

Safety considerations when bucking logs, including kickback.

Advanced Bucking Techniques

Overbucking Procedure

How to perform an overbucking cut.

Underbucking, Limb Pruning, and Springpole Handling

Limb Pruning Safety Advice

Safety advice for pruning limbs, especially those above chest height.

General Maintenance and Lubrication

Replacing Guide Bar and Chain

Step-by-step guide for replacing the guide bar and chain.

Guide Bar and Chain Installation

Chain Drive Links and Sprocket Fit

Proper placement of chain drive links and interaction with the sprocket.

Adjusting Chain Tension

Chain Tensioning Procedure

Step-by-step guide to achieve correct chain tension.

Chain Maintenance and Inspection

Raker Clearance and Drive Sprocket

Importance of raker clearance and drive sprocket condition.

Sharpening Chain Cutters

Filing Techniques and Safety

Proper filing angles, pressure, and safety precautions.

Filing Angles and Depth Gauge Adjustment

Depth Gauge Jointer Use

Using a depth gauge jointer for uniform clearance.

Guide Bar Maintenance and Nose Guard

SAFE-T-TIP Mounting Torque

Instructions for tightening the SAFE-T-TIP nose guard screw.

Cleaning the Air Filter

Air Filter Cleaning Options

Various methods for cleaning the air filter.

Carburetor Adjustment and Starter Unit

Idle Speed Adjustment Safety Warning

Crucial warning about the saw chain turning at idle.

Engine Cleaning and Spark Plug

Fuel Filter Check Importance

Importance of checking and replacing the fuel filter.

Spark Arrestor, Chain Brake, and Storage

Storing the Product Long-Term

Procedures for storing the chain saw for one month or longer.

Chain Specifications and Combinations

Troubleshooting Engine Problems

Troubleshooting Operation Issues

Hot Bar and Chain Solutions

Diagnosing and fixing issues causing the bar and chain to run hot.

Limited Warranty Statement

Warranty Exclusions

List of conditions and parts not covered by the warranty.

Emissions Control System Warranty

Owners Warranty Responsibilities

Owner's duties regarding maintenance and care for warranty validity.

Emissions Maintenance Schedule

Warranted Emissions Parts List

List of specific emissions parts covered under warranty.

Service and Repair Information

California Proposition 65 Warning

Warning regarding chemicals in engine exhaust.

Homelite UT10518 Specifications

General IconGeneral
BrandHomelite
ModelUT10518
CategoryChainsaw
LanguageEnglish

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