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Toro 51934B - User Manual

Toro 51934B
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Operator’s Manual
Trimmer/Brushcutter
Model No. 51950—250000001 & Up
Model No. 51970—250000001 & Up
Model No. 51990—250000001 & Up
Model No. 51951—250000001 & Up
Model No. 51971—250000001 & Up
Model No. 51991—250000001 & Up
Model No. 51930B—240000001 & Up
Model No. 51932B—240000001 & Up
Model No. 51934B—240000001 & Up
English (EN), French (F), and Spanish (ES)
WARNING:
To reduce the risk of injury, the user must read and understand the operators manual. Save this manual.
Form No. 3351-920

Questions and Answers

  • A
    Andrew SchultzAug 20, 2025
    How to prevent grass wraps around the Trimmer head assembly and the attachment shaft of my Toro 51934B Trimmer?
    • D
      Dawn LynnAug 20, 2025
      To prevent grass from wrapping around the trimmer head assembly and attachment shaft of your Toro Trimmer, cut tall grass from the top down and operate the product at full throttle.
  • S
    sara90Aug 23, 2025
    What to do if the line will not advance on my Toro Trimmer?
    • L
      Lisa MartinezAug 23, 2025
      If the line on your Toro Trimmer won't advance when using automatic line lengthening, consider these possible causes: * The line may be welded to itself. If so, lubricate it with silicone spray. * There might not be enough line on the spool. Install more line. * The line could be worn too short. Pull the line while alternately pressing down on and releasing the retaining cap. * The line may be tangled on the spool. Remove the line and rewind it. * The engine speed may be too slow. Advance the line at full throttle.
  • D
    Daniel WestAug 26, 2025
    Why Toro Trimmer engine does not reach full speed and emits excessive smoke?
    • M
      mhenryAug 26, 2025
      If your Toro Trimmer engine doesn't reach full speed and emits excessive smoke, ensure you're using fresh fuel and the correct 2-cycle oil mix. Also, check and clean the air filter and the spark arrestor screen, as they may be dirty.
  • D
    david14Aug 28, 2025
    What to do if the line will not advance when using automatic line lengthening on my Toro Trimmer?
    • B
      Bryan McintyreAug 28, 2025
      If the line on your Toro Trimmer won't advance automatically, try these steps: First, lubricate the line with silicone spray if it seems welded together. If there's not enough line, install more. If the line is too short, pull it while pressing and releasing the retaining cap. If the line is tangled, remove it from the spool and rewind it. Lastly, make sure the engine is at full throttle when advancing the line.
  • T
    Tyler CarterAug 31, 2025
    Why does oil drip from the muffler of my Toro 51934B Trimmer?
    • J
      john68Aug 31, 2025
      If oil drips from the muffler of your Toro Trimmer, operate the product at full throttle. Also, ensure you are using fresh fuel and the correct 2-cycle oil mix, and check to see if the air filter is dirty and clean it if needed.
  • M
    Michael KempSep 2, 2025
    How to fix retaining cap hard to turn when using automatic line lengthening on Toro Trimmer?
    • T
      Timothy WatsonSep 2, 2025
      If the retaining cap on your Toro Trimmer is hard to turn when using automatic line lengthening, clean the screw threads and lubricate them with grease. If this doesn't solve the problem, replace the retaining cap.
  • M
    Melissa CamachoSep 5, 2025
    Why does my Toro 51934B engine not reach full speed and emits excessive smoke?
    • W
      William RuizSep 5, 2025
      If your Toro Trimmer engine does not reach full speed and emits excessive smoke, check the following: 1. **Fuel mixture:** Use fresh fuel and the correct 2-cycle oil mix. 2. **Air filter:** Clean the air filter. 3. **Spark arrestor:** Clean the spark arrestor screen.
  • P
    Patricia RussoSep 7, 2025
    How to prevent grass from wrapping around the Toro 51934B head?
    • S
      Shannon DavisSep 8, 2025
      If grass wraps around the trimmer head assembly and the attachment shaft of your Toro Trimmer, consider these solutions: 1. If you are cutting tall grass at ground level, cut it from the top down. 2. If you are operating the product at part throttle, operate it at full throttle.
  • T
    Teresa CaldwellSep 12, 2025
    Why is oil dripping from the muffler of my Toro Trimmer?
    • J
      James WrightSep 12, 2025
      If oil drips from the muffler of your Toro Trimmer, here's what you should check: 1. Ensure you are operating the product at full throttle. 2. Verify you are using fresh fuel and the correct 2-cycle oil mix. 3. Make sure the air filter is clean.
  • T
    Tina BatesSep 13, 2025
    What to do if retaining cap is hard to turn on Toro 51934B?
    • K
      khansenSep 14, 2025
      If the retaining cap is hard to turn when using automatic line lengthening on your Toro Trimmer, the screw threads may be dirty or damaged. Clean the threads and lubricate them with grease. If this doesn't solve the problem, replace the retaining cap.

Summary

Operators Manual Introduction

Important Pre-Operation Information

Safe Fueling Procedures

Details on safely handling and mixing gasoline for the product.

Engine Starting Procedures

Instructions for starting the engine when cold versus warm.

Troubleshooting Flooded Engines

Steps to correct a flooded engine condition.

Product Introduction and Safety

Model and Serial Number Record

Space to record model and serial numbers for service.

Understanding Safety Signal Words

Explanation of signal words like DANGER, WARNING, CAUTION, Important, and Note.

Comprehensive Safety Rules

Operator Safety Precautions

Covers operator condition, clothing, protective gear, and stance.

Pre-Operation Inspection Checklist

Inspecting the product, attachment, and work area before use.

Safe Operating Practices

Rules for fueling, exhaust, work area, and controlling the product.

Product Safety Symbols

Interpreting Safety Symbols

Explains symbols related to safety, reading the manual, and protection.

Fuel and Oil Mixture Symbol

Specifies the type of gasoline and oil mixture required for the engine.

Hazard Signal Word Definitions

Signal Word Risk Levels

Defines DANGER, WARNING, and CAUTION signal words and their risk levels.

Service and Eye Protection Warnings

Emphasizes professional service and wearing eye protection.

Product Identification Labels

Engine Starting Procedure Labels

Label detailing cold and warm engine starting procedures.

General Safety and Operation Labels

Labels showing safety warnings, bystander distance, and choke positions.

Technical Specifications

Engine and Cutting Details

Details engine size, durability, cutting width, and line size.

Model Weight Information

Lists the weight of different model numbers of the trimmer/brushcutter.

Product Applications

Intended Product Uses

Outlines the intended uses for the trimmer and brushcutter.

Product Features Overview

Common Features Explained

Describes engine, dual line, grass deflector, and ergonomic design.

Model-Specific Features

Details features like grass barrier, blade, guard, strap, and barrier bar.

Product Unpacking Guide

Unpacking and Inspection Steps

Steps for carefully removing and inspecting the product from the box.

Included Parts List

Lists all components included in the product packaging.

Product Assembly Instructions

Shaft and Handle Assembly

Steps to connect the upper and attachment shafts and attach the front handle.

Shoulder Strap Attachment

Instructions for attaching the shoulder strap to the brushcutter.

Assembly: Grass Deflector

Grass Deflector Attachment

Instructions for attaching the grass deflector for curved and straight shaft models.

Brushcutter to Trimmer Conversion

Removing Brushcutter Parts

Steps to remove the blade, guard, and flanged washer.

Installing Trimmer Head

Procedures to attach the grass deflector and trimmer head.

Trimmer to Brushcutter Conversion

Removing Trimmer Parts

Steps to remove the trimmer head assembly and grass deflector.

Installing Brushcutter Parts

Procedures to attach the brushcutter guard and blade.

Product Operation Guide

Fuel Mixing Procedure

Detailed instructions for mixing gasoline and 2-cycle oil with a chart.

Fuel Tank Filling Safety

Steps for safely filling the fuel tank, including warnings.

Operation: Starting and Stopping

Engine Starting Procedures

Instructions for starting a cold or warm engine.

Stopping the Engine

Simple steps to turn off the engine and product.

Trimmer Operation

Curved Shaft Trimmer Use

How to hold and operate the curved shaft trimmer.

Straight Shaft Trimmer Use

How to hold and operate the straight shaft trimmer.

Advancing Trimmer Line

Method for extending the trimmer line during operation.

Brushcutter Operation

Brushcutter Usage Technique

How to hold and operate the brushcutter for effective cutting.

Effective Cutting Tips

Advice on cutting techniques and avoiding damage to the product or surroundings.

Product Maintenance Schedule

Emissions Control Maintenance

Table outlining maintenance intervals for emission-related parts.

Cleaning Product Components

Instructions for cleaning the exterior, air intake vents, and spool area.

General Product Servicing

General advice on checking fasteners and replacing damaged parts.

Maintenance: Line and Spool

Replacing Trimmer Cutting Line

Step-by-step guide to replace the trimmer line.

Replacing Trimmer Spool

Instructions for removing and installing a new trimmer spool.

Maintenance: Filters and Arrester

Fuel Cap Inspection

Inspecting the fuel cap for leaks and proper function.

Air Filter Cleaning and Oiling

Detailed steps for cleaning and oiling the air filter.

Spark Arrester Cleaning

How to locate, remove, and clean the spark arrester screen.

Maintenance: Spark Plug, Storage, Transport

Spark Plug Replacement

Steps for removing and installing a new spark plug.

Product Storage Guidelines

Procedures for short-term and long-term storage.

Product Transport Safety

Guidelines for safely moving the product.

Troubleshooting Common Issues

Engine Wont Start Troubleshooting

Common causes and solutions for engine starting issues.

Engine Performance Problems

Addresses issues like low speed, excessive smoke, and oil drips.

Line Advancement Issues

Solutions for line not advancing or retaining cap being hard to turn.

Cutting and Wrapping Problems

How to handle grass wrapping and cutting tall grass.

Product Warranty Information

Warranty Coverage Details

Outlines the terms, duration, and coverage of the product warranty.

How to Obtain Warranty Service

Instructions on how to get warranty repairs and what is covered.

Warranty Exclusions and Limits

Lists items and conditions not covered by the warranty.

Emission Control Warranty

Emission Warranty Rights & Duties

Explains the emissions warranty coverage and owner's responsibilities.

Emission Warranty Maintenance & Limits

Details owner's maintenance duties and warranty limitations.

Customer Service and Support

Contacting Authorized Service

Provides contact details for locating authorized service dealers.

Toro 51934B Specifications

General IconGeneral
Power SourceGas
Line Diameter0.095 inches
Line FeedBump Feed
Engine Type2-Cycle
Engine Displacement25.4 cc
Cutting SystemDual Line
Shaft TypeStraight

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