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Homelite UT70121A - User Manual

Homelite UT70121A
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OPERATOR’S MANUAL
Trimmer
F2020
UT70121A
SAVE THIS MANUAL FOR FUTURE REFERENCE
Your new trimmer has been engineered and manufactured to Homelite’s 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 buying a Homelite trimmer.
WARNING: To reduce the risk of injury, the user must read and understand the operator’s manual before using
this product.

Questions and Answers

  • C
    Christopher GouldAug 16, 2025
    What to do if Homelite Trimmer engine does not reach full speed and emits excessive smoke?
    • M
      Michael YoungAug 16, 2025
      If your Homelite Trimmer engine isn't reaching full speed and is emitting excessive smoke, consider the following: * **Oil fuel mixture:** Check the oil fuel mixture. * **Air filter:** Clean the air filter. * **Carburetor:** Turn the mixture needle clockwise 1/16 turn.
  • K
    Katherine NguyenAug 20, 2025
    Why Homelite UT70121A string will not advance?
    • D
      Dr. Aaron ShafferAug 20, 2025
      If the string on your Homelite Trimmer isn't advancing, it could be due to several reasons: * **String welded:** Lubricate the string with silicone spray. * **Not enough string:** Install more string. * **String worn:** Pull the strings while alternately pressing down on and releasing the spool retainer. * **String tangled:** Remove the string from the spool and rewind it. * **Engine speed:** Advance the string at full throttle.
  • K
    Katherine Valencia MDAug 23, 2025
    What to do if Homelite UT70121A Trimmer engine starts, runs, and accelerates but will not idle?
    • D
      donnacohenAug 23, 2025
      To fix Homelite Trimmer that starts, runs, and accelerates but will not idle, turn the idle speed screw clockwise to increase idle.
  • J
    Jacob CarrollAug 27, 2025
    How to fix Homelite UT70121A Trimmer spool retainer when it is hard to turn?
    • S
      Stacey BallardAug 28, 2025
      If the spool retainer on your Homelite Trimmer is hard to turn: * **Screw threads:** Clean the threads and lubricate with grease. If there's no improvement, replace the spool retainer. * **Operating throttle:** Operate the trimmer at full throttle.
  • J
    jlopezAug 31, 2025
    What to do if Homelite UT70121A Trimmer engine starts but will not accelerate?
    • C
      Christopher MartinAug 31, 2025
      If your Homelite Trimmer engine starts but won't accelerate, the carburetor may require adjustment.
  • K
    Kyle FrancisSep 3, 2025
    What to do if grass wraps round drive shaft housing and string head of Homelite Trimmer?
    • B
      Brenda GloverSep 4, 2025
      If grass is wrapping around the drive shaft housing and string head of your Homelite Trimmer: * **Cutting tall grass:** Cut tall grass from the top down. * **Operating throttle:** Operate the trimmer at full throttle.
  • E
    Edward TravisSep 7, 2025
    Why is oil dripping from the silencer of my Homelite UT70121A Trimmer?
    • S
      Sabrina HamiltonSep 7, 2025
      If oil is dripping from the silencer of your Homelite Trimmer: * **Operating throttle:** Use fresh fuel and the correct 2-cycle oil mix. * **Air filter:** Clean the air filter. * **Carburetor:** Turn the mixture needle clockwise 1/16 turn.
  • J
    johnsonroyNov 11, 2025
    Why Homelite Trimmer engine will not start?
    • X
      Xavier HoganNov 11, 2025
      There are several potential reasons why your Homelite Trimmer engine might not be starting: * **No spark:** Check for a spark by removing the spark plug, reattaching the cap, and laying the plug on the metal cylinder. Pull the starter rope and look for a spark at the plug tip. If there's no spark, try again with a new spark plug. * **No fuel:** Push the primer bulb until it's full of fuel. If it doesn't fill, the primary fuel delivery system may be blocked. If the primer bulb fills, the engine may be flooded. * **Flooded engine:** Remove the spark plug and turn the trimmer so the spark plug hole faces the ground. Move the choke lever to “RUN” 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...

Summary

SAFETY

GENERAL SAFETY RULES

Rules for safe operation, work area, and protective gear.

GENERAL SAFETY RULES (continued)

Specific precautions: hair, bystanders, conditions.

SPECIFIC SAFETY RULES FOR TRIMMER USE

Rules for trimmer operation, maintenance, and cutting.

SYMBOLS

SYMBOL EXPLANATION

Explains symbols used on the tool and in the manual.

SAFETY SYMBOL MEANING

Definitions of DANGER, WARNING, CAUTION, and NOTE symbols.

TECHNICAL DATA

UNPACKING

INSTRUCTIONS

Steps for removing and inspecting the product from the carton.

PACKING LIST FOR OWNERS KIT

Lists all items included in the owner's kit.

FEATURES

ASSEMBLY

ASSEMBLY INSTRUCTIONS: GRASS DEFLECTOR

Step-by-step guide to attaching the grass deflector.

ASSEMBLY INSTRUCTIONS: FRONT HANDLE

Step-by-step guide to attaching the front handle.

SILENCER GUARD ASSEMBLY

Instructions for attaching the silencer guard.

OPERATION

FUEL AND REFUELLLING: HANDLING THE FUEL SAFELY

Guidelines for safe fuel handling and storage.

MIXING THE FUEL

Instructions for mixing petrol and 2-cycle oil.

FILLING THE TANK

Procedure for safely filling the fuel tank.

OPERATING THE TRIMMER

How to hold and operate the trimmer at full throttle.

ADVANCING THE STRING: EZ LINE TAP ADVANCE SYSTEM

Method to advance trimmer string by tapping the head.

ADVANCING THE STRING MANUALLY

Manual method to advance the trimmer string.

CUTTING TIPS

Advice on optimal cutting techniques and areas to avoid.

GRASS DEFLECTOR LINE TRIMMING CUT-OFF BLADE

Function of the cut-off blade with the grass deflector.

STARTING AND STOPPING: TO START A COLD ENGINE

Step-by-step instructions for starting a cold engine.

STARTING AND STOPPING: TO START A WARM ENGINE

Instructions for starting a warm engine.

STARTING AND STOPPING: TO STOP THE ENGINE

Procedure for stopping the engine.

MAINTENANCE

SPOOL REPLACEMENT: EZ LINE TAP ADVANCE SYSTEM

Instructions for replacing the trimmer line spool.

STRING REPLACEMENT

Detailed steps for replacing the trimmer string.

CLEANING THE EXHAUST PORT AND SILENCER

Cleaning the exhaust system due to carbon deposits.

SPARK ARRESTER

How to clean or replace the spark arrester.

REPLACING AND CLEANING AIR FILTER

Steps for cleaning or replacing the air filter.

FUEL CAP

Information about the fuel cap's filter and check valve.

SPARKING PLUG

Specifications and replacement frequency for the sparking plug.

STORAGE (1 MONTH OR LONGER)

Guidelines for storing the trimmer for extended periods.

TROUBLESHOOTING

ENGINE WILL NOT START

Possible causes and solutions for an engine that won't start.

ENGINE STARTS BUT WILL NOT ACCELERATE

Troubleshooting steps for an engine that starts but won't accelerate.

ENGINE STARTS BUT WILL ONLY RUN AT HIGH SPEED AT HALF CHOKE

Solutions for an engine running at high speed on half choke.

ENGINE DOES NOT REACH FULL SPEED AND EMITS EXCESSIVE SMOKE

Causes and fixes for lack of speed and excessive smoke.

ENGINE STARTS, RUNS, AND ACCELERATES BUT WILL NOT IDLE

How to adjust the engine to idle properly.

STRING WILL NOT ADVANCE

Solutions for when the trimmer string does not advance.

GRASS WRAPS ROUND DRIVE SHAFT HOUSING AND STRING HEAD

Causes and solutions for grass wrapping around the trimmer head.

SPOOL RETAINER HARD TO TURN

How to fix a spool retainer that is difficult to turn.

OIL DRIPS FROM SILENCER

Reasons for oil dripping from the silencer and how to fix it.

WARRANTY

GUARANTEE - STATEMENT

Details of the product guarantee and warranty period.

EC DECLARATION OF CONFORMITY

Declaration of compliance with relevant EEC directives.

Homelite UT70121A Specifications

General IconGeneral
TypeString Trimmer
Cutting Width17 inches
Line Diameter0.095 inches
Engine Type2-Cycle
Cutting Swath17 inches
Shaft TypeStraight
Starter SystemRecoil
Power SourceGas
Handle TypeLoop
Fuel Tank Capacity14 fl. oz.

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