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Homelite UT21566 - User Manual

Homelite UT21566
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OPERATOR’S MANUAL
MightyLite 26cc VersaTool String Trimmer
UT21566/UT21967
SAVE THIS MANUAL FOR FUTURE REFERENCE
Your trimmer has been engineered and manufactured to our high standard for dependability, ease of operation, and operator
safety. Properly cared for, it will give you years of rugged, trouble-free performance.
Thank you for your purchase.
WARNING: To reduce the risk of injury, the user must read and understand the operator’s manual before using
this product.

Questions and Answers

  • B
    Brian BraunAug 17, 2025
    What to do if the string won't advance on my Homelite UT21566 Trimmer?
    • D
      Deborah McleanAug 17, 2025
      If the string on your Homelite Trimmer with the EZ Wind™ Tap Advance system won't advance, try these steps: First, lubricate the string with silicone spray. If that doesn't work, install more string. If the string is worn too short, replace it. If the string is tangled, remove it from the spool and rewind it. Also, make sure to advance the string at full throttle.
  • M
    Melissa HernandezAug 20, 2025
    How to prevent grass from wrapping around my Homelite UT21566 Trimmer?
    • A
      Angela EvansAug 20, 2025
      To prevent grass from wrapping around the drive shaft housing and string head of your Homelite Trimmer, avoid cutting tall grass at ground level and ensure you operate the trimmer at full throttle. If you are cutting tall grass, cut it from the top down.
  • R
    reneegilmoreAug 25, 2025
    Why is lubricant dripping from my Homelite Trimmer muffler?
    • G
      Gina SullivanAug 25, 2025
      If lubricant drips from the muffler of your Homelite Trimmer, operate the trimmer at full throttle. Also, ensure you are using fresh fuel and the correct 2-cycle lubricant mix. Clean the air filter as well.
  • R
    reneecordovaAug 28, 2025
    What to do if Homelite UT21566 starts but won't accelerate?
    • R
      rhondabrewerAug 28, 2025
      If your Homelite Trimmer engine starts but won't accelerate, allow the engine to warm up completely for about three minutes. If it still doesn't accelerate after warming up, contact a servicing dealer.
  • Y
    ymontgomeryAug 31, 2025
    How to adjust idle on Homelite Trimmer?
    • J
      josephharringtonSep 1, 2025
      If your Homelite Trimmer engine starts, runs, and accelerates but will not idle, adjust the idle speed screw on the carburetor. Turn the idle speed screw clockwise to increase the idle speed.
  • M
    Matthew Coleman MDSep 4, 2025
    Why is the spool retainer hard to turn on my Homelite Trimmer?
    • P
      Peter ParkerSep 5, 2025
      If the spool retainer is hard to turn when using the EZ Wind™ Tap Advance system on your Homelite Trimmer, try cleaning the threads and lubricating them with grease. If this doesn't improve the issue, replace the spool retainer.
  • T
    Teresa PachecoSep 8, 2025
    What causes excessive smoke from my Homelite UT21566?
    • E
      elizabethharveySep 8, 2025
      If your Homelite Trimmer engine does not reach full speed and emits excessive smoke, use fresh fuel and the correct 2-cycle lubricant mix. Also, clean the air filter. If the issue persists, contact a servicing dealer.
  • Y
    Yolanda MontoyaNov 12, 2025
    How to start a Homelite Trimmer that won't start?
    • A
      Ashley KingNov 12, 2025
      If your Homelite Trimmer engine won't start, begin by checking for a spark. Remove the spark plug, re-attach the spark plug cap, and lay the spark plug on the metal cylinder. Pull the starter rope and look for a spark at the spark plug tip. If there's no spark, try again with a new spark plug. Next, push the primer bulb until it's full of fuel. If it doesn't fill, the primary fuel delivery system might be blocked, and you should contact a servicing dealer. If the primer bulb fills, the engine might be flooded. Remove the spark plug and turn the trimmer so the spark plug hole faces the ground. Rotate the choke dial to the 'RUN' position and pull the starter cord 10 to 15 times to clear excess fuel. Clean and reinstall the spark plug. Pull the starter three times with the choke dial at 'RUN'...

Summary

Introduction

General Safety Rules

Read All Instructions

User must read and understand all instructions before operating the product for safe operation.

Specific Safety Rules

Symbols

Features

Product Specifications

Details technical specifications like weight, cutting width, displacement, and string diameter.

Assembly

Unpacking

Instructions for carefully removing the tool and accessories from the box and checking for damage.

Packing List

Lists all items included in the product packaging for assembly.

Installing the Power Head to the Attachment

Step-by-step guide on connecting the power head to the trimmer attachment using the coupler.

Attaching the Storage Hanger

Instructions on how to attach the storage hanger to the trimmer shaft for hanging.

Attaching the Front Handle

Guide to installing and adjusting the front handle for proper operation.

Attaching the Grass Deflector

Instructions for attaching the grass deflector, a safety component, to the trimmer.

Operation

Fueling and Refueling the Trimmer

Details on how to safely fuel and refuel the string trimmer with the correct fuel mixture.

Starting and Stopping

Step-by-step instructions for starting and stopping the engine in cold and warm conditions.

Operating the Trimmer

Guidance on holding and operating the trimmer correctly for safe and effective use.

Cutting Tips

Advice and techniques for effective trimming, including proper cutting angles and avoiding damage.

Advancing String Using the EZ WIND Tap Advance System

Instructions on how to advance the trimmer line using the EZ Wind™ Tap Advance System.

Advancing the String Manually

Method for manually advancing the trimmer string when the automatic system is insufficient.

Cut-Off Blade

Explanation of the cut-off blade's role in trimming the string to the correct length.

Maintenance

Spool Replacement

Guide for replacing the spool with new prewound line for the EZ WIND™ system.

String Replacement

Instructions on how to replace the trimmer string, including winding and securing it.

Cleaning the Exhaust Port

Guidance on cleaning carbon deposits from the exhaust port to restore performance.

Spark Arrestor

Information on cleaning or replacing the spark arrestor for proper product performance.

Cleaning the Air Filter Screen

Steps for cleaning the air filter screen to maintain engine performance and product longevity.

Fuel Cap

Information about the fuel cap's filter and check valve, and when to replace it.

Spark Plug

Details on the recommended spark plug type, gap, and replacement frequency.

Storing the Trimmer

Instructions for properly storing the trimmer, including fuel draining and storage location.

Troubleshooting

Warranty

Your Warranty Rights and Obligations

Outlines the owner's responsibilities and rights concerning the product's warranty.

Manufacturers Warranty Coverage

Details the coverage provided by Homelite for the product's emission control system.

Owners Warranty Responsibilities

Specifies the owner's duties regarding maintenance and proper use to maintain warranty validity.

Defect Warranty Coverage Requirements

Requirements for claiming warranty coverage for product defects.

Emissions Maintenance Schedule and Warranted Parts List

Schedule for maintaining emissions parts and a list of warranted components.

Parts and Service

How to Obtain Replacement Parts

Information on how to purchase replacement parts for the string trimmer.

How to Locate an Authorized Service Center

Guidance on finding authorized service centers for repairs and support.

How to Obtain Customer or Technical Support

Contact methods for obtaining customer or technical assistance.

Homelite UT21566 Specifications

General IconGeneral
BrandHomelite
ModelUT21566
CategoryTrimmer
LanguageEnglish

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