Echo SRM - 311 User Manual

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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.

WARNING

The engine exhaust from this

product contains chemicals known

to the State of California to cause

cancer, birth defects or other

reproductive harm.

Grass Trimmer/Brush Cutter

Operator's Manual

MODELS, SRM - 311

SRM - 311S

SRM - 311U

X7502128101

X750006721

04/04

Table of Contents

Questions and Answers:

L
ltaylorJul 26, 2025
What to do if my Echo SRM - 311 Trimmer engine cranks but starts hard or doesn't start?
- M
  meredith54Jul 26, 2025
  If your Echo Trimmer engine cranks but struggles to start or doesn't start at all, several factors could be responsible. A clogged fuel strainer, fuel line, or carburetor can prevent proper fuel delivery; in this case, clean or replace the affected components. Also, a lack of spark could be the issue; try turning the switch to the ON position. For more complex issues, it is recommended to see your Echo dealer. Also, you may need to adjust to .65mm(0.026 in.) Clean or replace Replace plug.
A
Allison WestAug 2, 2025
Why is my Echo SRM - 311 Trimmer engine cranking but not starting?
- J
  jonathanrodriguezAug 2, 2025
  If your Echo Trimmer engine cranks but struggles to start or doesn't start at all, several factors could be at play: * A clogged fuel strainer or fuel line, or issues with the carburetor. Try cleaning or replacing these components. * A fuel mixture that's too rich. In this case, open the choke, clean or replace the air filter, and adjust the carburetor. If the problem persists, consult your Echo dealer. * Absence of spark. If there is no spark, turn the switch to ON, or see your Echo dealer. * Incorrect spark plug gap, carbon buildup, fuel fouling, or a defective plug. Adjust the gap to 0.65mm (0.026 in.), clean or replace the plug, or replace it entirely if necessary.
J
James GibsonAug 7, 2025
Why does my Echo SRM - 311 engine run, but then dies or does not accelerate properly?
- J
  Jerry BellAug 8, 2025
  If your Echo Trimmer engine runs but dies or doesn't accelerate properly, consider these potential causes and solutions. Normal wear of components could be the issue, suggesting you clean or replace them as needed. Contaminants or residues in the fuel might also be a factor, requiring you to replace the fuel or clean/replace the affected parts. Furthermore, vibration can affect performance, so adjusting the trimmer might help. Extended operation in dirty or dusty locations may require cleaning. Clean and adjust or replace parts due to normal wear.
M
Michael ValdezAug 13, 2025
What to do if Echo SRM - 311 engine runs, but dies or does not accelerate properly?
- H
  hscottAug 13, 2025
  If your Echo Trimmer engine runs but dies or doesn't accelerate properly, consider these potential causes: * A dirty air filter. Clean or replace it. * A dirty fuel filter. Replace it. * A plugged fuel vent. Clean or replace it. * A dirty or worn spark plug. Clean and adjust, or replace it. * Improper adjustment. Adjust it. * Excessive dirt or debris. Clean it. * A cracked, plugged, or perforated screen. Replace it.
D
David HarrisAug 20, 2025
How to fix an Echo SRM - 311 when the engine does not crank?
- J
  jellisAug 20, 2025
  If your Echo Trimmer engine does not crank, this could indicate an internal engine problem, and it is recommended to see your Echo dealer.

Echo SRM - 311 Specifications

General

Brand	Echo
Model	SRM - 311
Category	Trimmer
Language	English

Summary

SAFETY INSTRUCTIONS

Personal Condition & Safety Gear

Guidelines for operator's physical condition and required safety equipment.

Extended Operation Precautions

HEALTH & OPERATIONAL RISKS

Repetitive Stress Injury Prevention

How to avoid RSI/CTS through proper posture and breaks.

MODEL SRM-311 PART DESCRIPTIONS

Key Components and Controls

Detailed descriptions of Power Head, Drive Shaft, Throttle Trigger, Stop Switch, and Choke.

Cutting Attachments and Shields

Information on Nylon Head, Blades, Cut-off Knife, and Plastic/Metal Shields.

ASSEMBLY

Drive Shaft/Power Head Assembly

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

Plastic Debris Shield Installation

ASSEMBLY (Continued)

Install Blade

Step-by-step guide for securely installing metal blades.

U-Handle Installation

Front Handle/Barrier Bar Installation

Connect Throttle Linkage and Ignition Leads

Balance and Adjust Unit

PRE-OPERATION

Preparing for Blade Use

Configuration requirements (shields, handles, harnesses) for different blade types.

Choosing the Correct Blade

Guidance on selecting the appropriate blade for the material being cut.

OPERATION WITH BLADES

Blade Type Selection & Use

Details on Plastic/Nylon, 8 Tooth, 80 Tooth, and 22 Tooth blades and their applications.

Harness Recommendation

FUEL

Fuel and Oil Specifications

Requirements for gasoline and two-stroke oil, including mix ratios.

Fuel Handling and Mixing

Safe procedures for mixing fuel and handling flammable liquids.

OPERATION

Starting Cold Engine

Step-by-step instructions for starting a cold engine using the choke and primer.

OPERATION (Continued)

Starting Warm Engine

STOPPING ENGINE

MAINTENANCE INTERVALS

Do-It-Yourself Maintenance

AIR FILTER MAINTENANCE

FUEL FILTER MAINTENANCE

SPARK PLUG MAINTENANCE

COOLING SYSTEM CLEANING

COOLING SYSTEM CLEANING (Continued)

EXHAUST SYSTEM - SPARK ARRESTOR SCREEN

LUBRICATION

Gear Housing Lubrication

Drive Shaft Lubrication

NYLON LINE REPLACEMENT (Model SRM-311 Only)

NYLON LINE REPLACEMENT (Models SRM-311S/311U Only)

NYLON LINE REPLACEMENT (Continued)

SHARPENING METAL BLADES

Sharpening 8-tooth Blades

Guide on how to sharpen 8-tooth blades using files.

TROUBLESHOOTING

Engine Problem Troubleshooting Chart

A chart to diagnose and resolve common engine starting and running issues.

STORAGE

Long Term Storage (over 30 days)

Protective maintenance procedures for storing the unit for extended periods.

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