Echo SRM-310

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Grass Trimmer/Brush Cutter

Operator's Manual

MODELS, SRM - 310

SRM - 310S

SRM - 310U

Serial Number 04001001 - 04999999

WARNING DANGER

Read rules for safe operation and instructions carefully. ECHO provides an Operator's

Manual and a Safety Manual. Both must be read and understood for proper and safe

operation.

X7502127100 X750004110

01/03

Table of Contents

Other manuals for Echo SRM-310

Parts Catalog44 pages

Questions and Answers:

N
Nicholas FrancisJul 26, 2025
Why does my Echo Trimmer engine crank but not start?
- G
  George WaltonJul 26, 2025
  If your Echo Trimmer engine cranks but struggles to start, or doesn't start at all, several factors could be responsible. The fuel strainer or fuel line might be clogged, or there could be an issue with the carburetor. Try cleaning or replacing these parts. Also, the fuel mixture may be too rich, so try opening the choke, cleaning or replacing the air filter, or adjusting the carburetor. If there's no spark, ensure the switch is in the ON position. Finally, inspect the spark plug; if the spark gap is incorrect, adjust it to .65mm (0.026 in.), or clean/replace the plug if it's covered with carbon, fouled with fuel, or defective.
R
Robert SmithAug 6, 2025
What to do if Echo SRM-310 Trimmer engine runs, but dies or does not accelerate properly?
- C
  Chelsea KellyAug 6, 2025
  If your Echo Trimmer engine runs but dies or doesn't accelerate properly, it could be due to several reasons. Contaminants or residues in the fuel may be the problem; in this case, replace the fuel, or clean/replace the fuel components. Normal wear of the engine parts can also lead to this issue; clean and adjust or replace worn parts. Improper adjustment may also cause this problem, so adjust as necessary. If you've been operating the trimmer in dirty or dusty locations, clean the engine components.
W
Wesley RomeroAug 15, 2025
What to do if Echo Trimmer engine does not crank?
- K
  Kevin HorneAug 15, 2025
  If the Echo Trimmer engine does not crank, this could indicate an internal engine problem. In this case, it's best to see your Echo dealer for assistance.

Echo SRM-310 Specifications

General

Engine Type	2-Stroke
Displacement	30.5 cc
Shaft Type	Straight
Starter System	Recoil
Cutting Width	430 mm

Summary

Safety Instructions

Personal Condition and Safety Equipment

Covers physical condition, eye protection, hand protection, and hearing protection requirements.

Equipment

Unit Inspection and Safety Checks

Details pre-operation checks for loose parts, fuel leaks, shields, and cutting attachments.

Safe Operation

General Operating Practices

Guidelines for safe operation, including grip, stance, and ventilation.

Specifications

Model and Dimension Specifications

Lists physical dimensions, weight, and engine type for different models.

Performance and Technical Specs

Assembly

Drive ShaftPower Head Assembly

Step-by-step instructions for connecting the drive shaft to the power head.

Nylon Line Operation Setup

Blade Operation

Install Blade

Front HandleBarrier Bar Installation and Adjustment

U-Handle Installation

Connect Throttle Linkage and Ignition Leads

Balance and Adjust Unit

Pre-Operation

Preparing for Blade Use

Specifies required shields, harnesses, and handles for blade operation.

Choosing the Correct Blade

Fuel

Fuel Requirements and Type

Details approved gasoline octane, MTBE content, and two-stroke oil specifications.

Mixing and Handling Procedures

Instructions for mixing fuel, handling, and safety precautions.

Operation

Starting Cold Engine

Step-by-step guide for starting the engine from a cold state.

Starting Warm Engine

Stopping Engine

Maintenance

Maintenance Intervals Schedule

Air Filter

Air Filter Cleaning and Inspection

Fuel Filter

Fuel Filter Replacement

Spark Plug

Spark Plug Inspection and Gap Adjustment

Cooling Systems Cleaning

Cylinder Fin Cleaning Procedure

Carburetor Adjustment

Idle Speed Adjustment

Lubrication

Gear Housing Lubrication

Drive Shaft Lubrication

Nylon Line Replacement

Spool and Line Loading

Troubleshooting

Engine Problem Troubleshooting Chart

A guide to diagnosing and resolving common engine starting and running issues.

Storage

Long Term Storage Procedures

Steps for preparing the unit for storage exceeding 30 days.

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