Troy-Bilt TB25S User Manual (English)

Questions and Answers:

M
Matthew KennedyJul 30, 2025
Why does my Troy-Bilt TB25S Trimmer engine lack power or stall?
- M
  Megan OrtizJul 30, 2025
  If your Troy-Bilt Trimmer engine lacks power or stalls, consider these potential causes: the fuel might be old (over 30 days) or improperly mixed, in which case you should drain the fuel tank and add fresh, properly-mixed fuel. Another reason may be that the air filter is dirty. Clean or replace the air filter to resolve this. A fouled spark plug can also cause these issues; replace it if necessary.
T
Tamara EvansAug 8, 2025
What to do if my Troy-Bilt Trimmer engine will not accelerate?
- C
  Christopher BeltranAug 8, 2025
  If your Troy-Bilt Trimmer engine won't accelerate, the issue could stem from several causes. Old or improperly mixed fuel is a common culprit; drain the fuel tank and add fresh, properly-mixed fuel. Another possibility is that the cutting head is bound with grass, so stop the engine and clean it. A dirty air filter can also impede acceleration; clean or replace it.
D
Dana ThomasAug 19, 2025
Why Troy-Bilt Trimmer engine will not idle?

Troy-Bilt TB25S Specifications

General

Brand	Troy-Bilt
Model	TB25S
Category	Trimmer
Language	English

Summary

Service Information

Service Contact and Warranty

Details on obtaining service, warranty claims, and authorized service centers.

Safety Guidelines

Safety Symbol Meanings

Explains the meaning of safety symbols like Danger, Warning, Caution, and Note.

Spark Arrestor Note

Discusses spark arrestor requirements for certain areas and the unit's equipment.

Important Safety Instructions

Read All Instructions Before Operating

Emphasizes reading and understanding all safety instructions before use.

Safety Warnings for Gas Units

Details specific safety precautions related to gasoline and its flammability.

Safety While Operating

Provides essential safety guidelines to follow during the operation of the unit.

Additional Safety Warnings

Other Safety Warnings

Covers additional safety precautions for maintenance, storage, and general handling.

Safety and International Symbols

Safety Alert Symbol and Manual Reference

Explains the safety alert symbol and the importance of reading the manual.

Personal Protective Equipment

Stresses the need for eye, hearing, foot, and hand protection.

Fuel and Control Operation

Details fuel requirements, E85 caution, and operation of primer/choke controls.

Operational Hazards and Warnings

Warns about thrown objects, hot surfaces, sharp blades, and loose screws.

Know Your Unit

Unit Applications

Lists the primary uses of the trimmer, such as cutting grass and edging.

Assembly Tools Required

Specifies the tools needed for assembling the unit.

Specifications

Provides detailed technical specifications of the TB25S trimmer.

Assembly

Installing the Cutting Head Shield

Instructions for securely attaching the cutting head shield to the unit.

Connecting the Upper and Lower Shafts

Guides on how to join the upper and lower shaft components.

Handle Installation and Adjustment

Installing and Adjusting the Handle

Details the process for fitting and adjusting the unit's handle for comfort.

Oil and Fuel

Oil and Fuel Mixing Instructions

Provides detailed guidance on the correct mixture of oil and gasoline for the engine.

Fueling the Unit

Step-by-step instructions for safely adding fuel to the unit's tank.

Starting and Stopping

Starting Instructions

Comprehensive steps for starting the TB25S trimmer engine.

Stopping Instructions

Clear steps on how to safely shut down the trimmer's engine.

Operation

Holding the Unit

Guidance on the correct posture and grip for safe operation.

Tips for Best Results

Offers advice for efficient trimming and cutting techniques.

Decorative Trimming

Instructions on how to perform decorative trimming around objects.

Maintenance

Maintenance Schedule

Outlines the required maintenance procedures and their frequencies.

Replacing the Trimming Line

Step-by-step guide on how to replace the trimming line.

Air Filter and Idle Speed Maintenance

Maintaining the Air Filter

Instructions for cleaning and maintaining the unit's air filter.

Adjusting the Idle Speed

Guidance on how to adjust the engine's idle speed for proper operation.

Spark Plug and Cleaning/Storage

Maintaining the Spark Plug

Steps for inspecting, cleaning, and gapping the spark plug.

Cleaning and Storage

Cleaning the Unit

Provides instructions on how to clean the exterior of the unit.

Storing the Unit

Details procedures for both short-term and long-term storage of the unit.

Troubleshooting

Engine Will Not Start

Lists common causes and solutions when the engine fails to start.

Engine Will Not Idle

Addresses issues related to the engine not idling properly.

Engine Will Not Accelerate

Provides solutions for when the engine fails to accelerate.

Engine Lacks Power or Stalls

Solutions for when the engine loses power or stalls during operation.

Warranty Information

Manufacturer's Limited Warranty

Outlines the terms and conditions of the manufacturer's limited warranty.

How to Obtain Service

Provides instructions on how to locate and contact authorized service centers.

Warranty Exclusions

Lists specific cases and parts not covered by the limited warranty.

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