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Toro 51978-314000001 - User Manual

Toro 51978-314000001
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17 in. String Trimmer - Curved Shaft
Model No. 51958—314000001 & Up
18 in. String Trimmer - Straight Shaft
Model No. 51978—314000001 & Up
English (EN), French (FR), and Spanish (ES)
WARNING:
To reduce the risk of injury, the user must read and understand the operator’s manual. Save this manual.
Form No. 3378-721 Rev. A
If you have questions concerning
your trimmer, please call us
at 866-574-9242 (US) or
866-574-9243 (Canada).
NOTICE
Do not use E15, E20, or E85 fuel (or fuel
containing greater than 10% ethanol) in
this product. It is a violation of federal law
and will damage the unit and void your
warranty.

Table of Contents

Questions and Answers

  • S
    sharonandersonAug 13, 2025
    How to fix Toro 51978-314000001 Trimmer line that will not advance when using automatic line lengthening?
    • N
      Nicholas DouglasAug 13, 2025
      If the line on your Toro Trimmer isn't advancing automatically, here are some potential causes and solutions: * **Line welded to itself:** Lubricate with silicone spray. * **Not enough line on the spool:** Install more line. * **Line worn too short:** Pull the line while alternately pressing down on and releasing the retaining cap. * **Line tangled on spool:** Remove the line from the spool and re-wind it. * **Engine speed too slow:** Advance the line at full throttle.
  • H
    Holly GatesAug 20, 2025
    What to do if grass wraps around the trimmer head assembly and the attachment shaft of Toro Trimmer?
    • J
      Justin RojasAug 20, 2025
      If grass wraps around the trimmer head assembly and the attachment shaft of your Toro Trimmer: * Cutting tall grass at ground level: Cut tall grass from the top down. * Operating the product at part throttle: Operate the product at full throttle.
  • R
    robertbondAug 27, 2025
    What to do if Toro 51978-314000001 Trimmer engine does not reach full speed and emits excessive smoke?
    • A
      Ashley MelendezAug 27, 2025
      If your Toro Trimmer engine doesn't reach full speed and emits excessive smoke, consider the following: 1. **Check the oil fuel mixture:** Use fresh fuel and the correct 2-cycle oil mix. 2. **Air filter:** Clean the air filter. 3. **Spark arrestor screen:** Clean the spark arrestor.
  • J
    Jose SantosAug 31, 2025
    Why does oil drip from the muffler of my Toro Trimmer?
    • I
      ivaldezSep 1, 2025
      Oil may drip from the muffler of your Toro Trimmer due to: * Operating the product at part throttle: Operate the product at full throttle. * Incorrect oil/fuel mixture: Use fresh fuel and the correct 2-cycle oil mix. * Dirty air filter: Clean the air filter.
  • S
    Steven CruzNov 7, 2025
    Why Toro Trimmer engine will not start?
    • R
      Robert ChangNov 7, 2025
      There are several reasons why your Toro Trimmer engine might not start: * **No spark:** Remove the spark plug, reattach the cap, and lay it on the metal cylinder. Pull the starter cord to check for a spark. If there's no spark, try again with a new spark plug. * **No fuel:** Push the primer bulb until it's full. If it doesn't fill, the fuel delivery system may be blocked. If it does fill, the engine might be flooded. * **Flooded engine:** Remove the spark plug and turn the product so that the spark plug hole is aimed at the ground. Ensure the choke lever is set to RUN and pull the starter cord 10 to 14 times to clear excess fuel. Clean and reinstall the spark plug. With the trigger fully depressed, pull the starter cord 3 times. If it doesn't start, set the choke lever to FULL and f...

Summary

Read This Information

Fueling Procedures

Instructions for safely fueling the trimmer with correct fuel mixture.

Starting the Trimmer Engine

Guidance on starting the engine, including cold/warm starts and flooded engines.

Safety Guidelines and Precautions

General Safety Rules

Comprehensive safety precautions for operating the trimmer.

Specific Safety Rules for Trimmer Use

Safety rules tailored specifically for trimmer operation.

Assembly Instructions

Operation and Usage Guide

Fueling and Refueling Procedures

Procedures and warnings for fueling the trimmer.

Starting and Stopping the Engine

Guides for starting and shutting off the trimmer engine.

Operating the Trimmer Safely

Cutting Line Management and Tips

Maintenance and Care

Installing Trimmer Line

Troubleshooting Common Issues

Toro 51978-314000001 Specifications

General IconGeneral
BrandToro
Model51978-314000001
CategoryTrimmer
LanguageEnglish

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