McCulloch MT765 User Manual (English)

Questions and Answers:

V
Vincent MarshallJul 29, 2025
How to fix a McCulloch MT765 that will not start?
- K
  Kimberly MorganJul 29, 2025
  If your McCulloch Trimmer won't start, several factors could be the cause. First, check if the fuel tank is empty and fill it with properly mixed fuel if needed. Make sure you press the primer bulb fully and slowly 10 times. If the engine is flooded, squeeze the trigger and pull the starter rope. Also, old or improperly mixed fuel can be a culprit, so drain the gas tank and add a fresh fuel mixture. A fouled spark plug or a plugged spark arrestor might also be the issue; in these cases, replace or clean the spark plug or clean or replace the spark arrestor, respectively.
S
Stephanie HicksAug 3, 2025
What to do if the cutting attachment will not advance on my McCulloch MT765 Trimmer?
- J
  Jonathan RiveraAug 3, 2025
  If the cutting attachment on your McCulloch Trimmer won't advance, several issues could be the cause. First, check if the cutting attachment is bound with grass; if so, stop the engine and clean the cutting attachment. If the cutting attachment is out of line, refill it with a new line. An inner reel that is bound up will also prevent advancement, so replace the inner reel. A dirty cutting head can be another cause, so clean the inner reel and outer spool. Also, if the line is welded, disassemble, remove the welded section, and rewind. If the line is twisted when refilled, disassemble and rewind the line. Finally, if not enough line is exposed, push the bump knob and pull out the line until 4 inches (102 mm) of line is outside of the cutting attachment.
A
Allison HodgesAug 8, 2025
What to do if the cutting line advances uncontrollably on my McCulloch Trimmer?
- C
  Christina WelchAug 9, 2025
  If the cutting line on your McCulloch Trimmer advances uncontrollably, it might be due to oil, cleaner, or lubricant in the cutting head. Clean and thoroughly dry the cutting head to resolve this issue.
M
Michelle LopezAug 13, 2025
What to do if my McCulloch MT765 Trimmer engine will not accelerate?
- J
  Jason RoblesAug 13, 2025
  If your McCulloch Trimmer engine will not accelerate, there are several possible causes. Start by checking the fuel. Old or improperly mixed fuel can cause acceleration issues, so drain the gas tank and add a fresh fuel mixture. A dirty air filter may also be the cause, so clean or replace the air filter. Also, a plugged spark arrestor may prevent acceleration, so clean or replace the spark arrestor. Finally, check the cutting attachment; if it's bound with grass, stop the engine and clean it.
M
Monica GoldenAug 18, 2025
Why does my McCulloch MT765 engine lack power or stall?
- S
  srobertsonAug 18, 2025
  If your McCulloch Trimmer engine lacks power or stalls, consider these potential causes. Old or improperly mixed fuel is a common issue, so drain the gas tank and add fresh fuel mixture. A fouled spark plug can also lead to power loss, so replace or clean the spark plug. Additionally, a plugged spark arrestor might be the problem, so clean or replace the spark arrestor.
C
Christopher ScottAug 25, 2025
Why won't my McCulloch MT765 Trimmer engine idle?
- J
  jconnerAug 25, 2025
  If your McCulloch Trimmer engine won't idle, several factors could be responsible. A plugged air filter can cause idling problems, so replace or clean the air filter. Also, old or improperly mixed fuel can prevent the engine from idling properly, so drain the gas tank and add a fresh fuel mixture.

McCulloch MT765 Specifications

General

Brand	McCulloch
Model	MT765
Category	Trimmer
Language	English

Summary

Introduction

Service Information

Information on where to get service and how to find authorized dealers.

Product References, Illustrations and Specifications

Details on product information, changes, copyright, and trademarks.

Rules for Safe Operation

Safety Symbols and Meanings

Explanation of safety symbols used in the manual and their meanings.

Important Safety Instructions

Key safety rules to follow before and during operation.

Safety Warnings for Gas Trimmers

Specific warnings related to gasoline and its flammability.

Fueling and Operating Precautions

Safe practices for adding fuel and operating the trimmer outdoors.

While Operating

Guidelines for safe operation, including protective gear and unit handling.

Other Safety Warnings

Additional safety advice for storage, transport, and general use.

Safety and International Symbols

Explains various safety symbols and pictographs found on the product.

Choke Control and Fuel Type

Details on choke positions and the required fuel type.

Know Your Unit

Applications

Lists the common uses for the trimmer, such as cutting grass and edging.

Unit Components

Identifies key parts of the trimmer with labels and diagrams.

Assembly Instructions

Install and Adjust the D-Handle

Step-by-step guide to attaching and positioning the D-handle.

Install the Cutting Attachment Shield

Instructions for securely attaching the safety shield for the cutting head.

Oil and Fuel Information

Oil and Fuel Mixing Instructions

Guidelines for correctly mixing gasoline and oil for the 2-cycle engine.

Using Blended Fuels

Precautions when using blended fuels containing ethanol or methanol.

Using Fuel Additives

Recommendations for fuel additives to prevent corrosion and gumming.

Starting/Stopping Instructions

Starting Instructions

Detailed steps for starting the trimmer engine, including choke and primer use.

Stopping Instructions

Procedures for safely shutting down the trimmer engine.

Operating Instructions

Holding the Trimmer

Proper body posture and hand placement for safe and effective operation.

Adjusting Trimming Line Length

How to extend the trimmer line using the bump head mechanism.

Tips for Best Trimming Results

Techniques for efficient and effective grass cutting and trimming.

Decorative Trimming

Method for performing decorative trimming around objects.

Maintenance and Repair Instructions

Maintenance Schedule

Schedule of required maintenance tasks and their frequencies.

Line Installation

Instructions for installing new trimmer line, including warnings.

Winding the Existing Inner Reel

Step-by-step guide to rewinding trimmer line onto the inner reel.

Single Line Installation

Detailed steps for installing single-strand trimmer line.

SplitLine™ Installation

Specific instructions for installing the SplitLine™ trimming line.

Installing a Prewound Reel

Guide for installing a pre-filled trimmer line spool.

Air Filter Maintenance

Procedures for cleaning and re-oiling the air filter for engine performance.

Spark Arrestor Maintenance

Instructions for cleaning and maintaining the spark arrestor screen.

Carburetor Adjustment

Information on carburetor adjustment and when to seek professional service.

Clean Air Filter

Explains the importance of the air filter and how to clean it.

Adjust Idle Speed Screw

Steps to adjust the idle speed of the engine.

Replacing the Spark Plug

Guide for removing, checking, and replacing the spark plug.

Cleaning

General cleaning instructions for the trimmer unit.

Storage

Guidelines for storing the trimmer safely.

Long Term Storage

Specific procedures for storing the unit for extended periods.

Transporting

Precautions and steps for safely transporting the trimmer.

Troubleshooting

Engine Will Not Start

Common causes and solutions for the engine failing to start.

Engine Will Not Idle

Causes and fixes for the engine not idling properly.

Engine Will Not Accelerate

Reasons and actions for the engine failing to accelerate.

Engine Lacks Power or Stalls When Cutting

Solutions for when the engine loses power or stops during use.

Cutting Attachment Will Not Advance Line

Troubleshooting steps for when the trimmer line does not feed out.

Cutting Line Advances Uncontrollably

Causes and solutions for the trimmer line feeding out excessively.

Specifications

Engine

Technical specifications for the engine, including type, displacement, and RPM.

Drive Shaft and Cutting Attachment

Specifications for the drive shaft, cutting mechanism, and line details.

California / EPA Emission Control Warranty Statement

Your Warranty Rights and Obligations

Explains owner responsibilities regarding maintenance and warranty claims.

Manufacturer's Warranty Coverage

Details the warranty period, coverage, and service procedures.

Manufacturer's Limited Warranty for: McCULLOCH

Limited Warranty Terms

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

Obtaining Service

Instructions on how to get warranty service and locate dealers.

Warranty Exclusions

Lists situations and parts not covered by the warranty.

How State Law Relates to This Warranty

Explains how state-specific laws affect the warranty terms.

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