Homelite UT10517 - User Manual

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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.

Questions and Answers

A
Alicia GordonAug 12, 2025
Why Homelite UT10517 Chainsaw engine will not start?
- R
  roseandersonAug 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.
A
Adam PadillaAug 16, 2025
What to do if Homelite Chainsaw engine does not reach full speed and/or emits excessive smoke?
- M
  Martin MorrisAug 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.
M
Miss Tiffany PhillipsAug 20, 2025
What to do if Homelite UT10517 bar and chain running hot and smoking?
- R
  robert31Aug 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.
M
Mary ScottAug 25, 2025
What to do if Homelite Chainsaw engine starts but will not accelerate properly?
- S
  Sabrina McbrideAug 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.
M
Michael HallAug 27, 2025
What to do if Homelite Chainsaw engine starts, then dies?
- T
  travisthomasAug 28, 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.
I
icisnerosAug 31, 2025
What to do if Homelite Chainsaw engine starts but will not run properly at high speed?
- F
  Frank MuellerAug 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.
J
Joseph GarrettSep 4, 2025
What to do if Homelite UT10517 Chainsaw engine starts, runs, and accelerates but will not idle and chain turns at idle?
- P
  Pamela DawsonSep 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.
N
Norman RodriguezSep 8, 2025
What to do if Homelite UT10517 engine starts and runs, but chain is not rotating?
- J
  Jeffery JohnsonSep 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.

Homelite UT10517 Specifications

General

Bar Length	16 inches
Weight	9.5 lbs
Automatic Oiler	Yes
Chain Pitch	3/8 in
Chain Gauge	0.050 inches
Engine Type	2-stroke

Summary

Introduction

Safety Guidelines

General Safety Rules

Key safety precautions for operating the chain saw.

Specific Safety Rules

Detailed safety instructions for specific operations and conditions.

Refueling Safety Precautions

Handling fuel safely to prevent fire and injury.

Kickback Hazards and Prevention

Understanding and avoiding dangerous kickback reactions.

Product Information and Features

Symbols Explained

Meaning of safety and operational symbols used in the manual.

Service Requirements and Signal Words

Information on servicing, qualified technicians, and hazard level indicators.

Glossary of Terms

Definitions of common terms used in chain saw operation.

Features and Specifications

Overview of product features and technical specifications.

Key Components and Functions

Description of important parts like choke, brake, and kickback features.

Assembly and Operation

Assembly and Unpacking

Steps for unpacking, inspecting, and assembling the chain saw.

Operation Overview and Applications

General operation, safety warnings, and intended uses of the saw.

Fuel Handling and Mixing

Safe procedures for fueling, refueling, and mixing fuel.

Operational Procedures

Step-by-step guide for filling tanks and operating the chain brake.

Starting the Engine

Detailed instructions for starting the engine in various conditions.

Stopping the Engine

Proper procedures for safely shutting down the engine.

Adjustments and Cutting Techniques

Adjusting idle speed and basic cutting methods.

Kickback Prevention and Grip

Understanding kickback and maintaining a proper grip.

Cutting Procedures and Work Area Safety

Stance, work area precautions, and basic cutting steps.

Tree Felling Operations

Procedures and safety for felling trees, including hazardous conditions.

Specialized Cutting Tasks

Instructions for removing roots and bucking logs.

Bucking Techniques

Methods for bucking logs, including using wedges and under stress.

Advanced Cutting Operations

Techniques for underbucking, limbing, pruning, and cutting springpoles.

Maintenance Procedures

General Maintenance and Lubrication

Cleaning, avoiding solvents, and lubrication requirements.

Replacing Guide Bar and Chain

Safety and steps for replacing the guide bar and chain.

Chain Installation Steps

Detailed steps for installing the chain and guide bar.

Adjusting Chain Tension

Procedures for setting and checking chain tension.

Chain Maintenance and Inspection

Retensioning, checking for wear, and identifying sharpening needs.

Sharpening Chain Cutters

How to file cutters to maintain sharpness and angles.

Filing Angles and Depth Gauge

Correct angles for filing and adjusting depth gauge clearance.

Guide Bar and Nose Guard Maintenance

Maintaining the guide bar and mounting the SAFE-T-TIP nose guard.

Air Filter Cleaning

Instructions for cleaning the air filter for optimal engine performance.

Carburetor and Starter Maintenance

Adjusting the carburetor and cleaning the starter unit.

Engine and Spark Plug Maintenance

Cleaning the engine and replacing the spark plug.

Spark Arrestor, Brake, and Storage

Maintaining spark arrestor, brake, and proper storage procedures.

Troubleshooting and Warranty

Bar and Chain Combinations

Specifications for bar length, chain part number, and drive links.

Troubleshooting Engine Issues

Solutions for common engine starting and performance problems.

Troubleshooting Operation Issues

Diagnosing and resolving issues with chain rotation and temperature.

Warranty Information

Details Homelite's limited warranty coverage and exclusions.

Emissions Warranty and Responsibilities

EPA/CARB warranty rights, owner responsibilities, and parts list.

Emissions Maintenance Schedule

Schedule for maintaining and warranted parts for emissions control.

Service and Parts

Service Contact and Location

How to contact Homelite for service and find authorized dealers.

Repair Parts Identification

Instructions for identifying model and serial numbers for parts.

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