Hyundai HY4BC31 User Manual

40 pages

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PETROL BRUSHCUTTER

HY4BC31

User Manual

Questions and Answers:

A
Annette WilsonAug 1, 2025
What to do if my Hyundai Brush Cutter engine cranks or starts hard but does not start?
- S
  Stephen BrooksAug 1, 2025
  If your Hyundai Brush Cutter's engine is having trouble starting, consider these potential causes and solutions: * Check if the fuel filter is blocked; if so, clean or replace it. * Inspect the fuel line for blockages or clogs; clean or replace as necessary. * Ensure the stop switch is turned ON. * Verify the spark gap is correctly adjusted to 0.6 – 0.8mm. * If the spark plug is covered with carbon or fouled with fuel, clean or replace it. * If the spark plug is defective, replace it. For carburetor faults, electrical problems or interlock switch issues, it's best to contact a dealer. If the fuel mixture is too rich, open the choke, clean or replace the air filter, adjust the carburetor, or contact a dealer.
E
Elizabeth ThomasAug 15, 2025
Why does my Hyundai HY4BC31 engine run but not accelerate properly?
- V
  Victoria CopelandAug 15, 2025
  If your Hyundai Brush Cutter engine runs but lacks proper acceleration, several factors could be responsible: * A dirty air filter may be restricting airflow; clean or replace it. * A dirty fuel filter could be the issue; replace the fuel filter. * A blocked fuel vent may be the cause; clear the vent. * A dirty or worn spark plug may be to blame; clean, adjust, or replace it. * Improper adjustment may be hindering performance; adjust accordingly. * Excessive heat can affect engine performance; clean the machine and allow it to cool down. * A cracked screen may be the problem; replace it.

Hyundai HY4BC31 Specifications

General

Model Number	HY4BC31
Engine Type	4 stroke, Air cooled
Engine Displacement	31cc
Engine Oil Type	Semi-Synthetic SAE 15W40
Engine Oil Capacity	60ml
Engine Power	0.8kW
Engine Max Speed at Rated Power	7000rpm
Cutting Diameter – Brush Cutter	255mm
Cutting Diameter – Grass Trimmer	450mm
Grass Trimmer Line Diameter	2.5mm
Fuel Tank Capacity	280ml
Noise Level	104dB

Weight and Dimensions

Net Weight	4.8Kg

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Summary

Safety and Operation Guidelines

General Safety Notes and Precautions

Covers general safety rules, operator responsibility, and precautions for safe operation.

Warning Symbols and Personal Protective Equipment (PPE)

Explains hazard symbols (DANGER, WARNING, CAUTION, NOTE) and lists required PPE.

Safety Information

Carbon Monoxide Hazards and Prevention

Hazards associated with carbon monoxide fumes and precautions to prevent poisoning.

General Fuel Safety

General safety rules related to handling and using fuel for the machine.

Operational Safety

Fuel Flammability and Fire Hazards

Safety precautions for handling flammable fuels and avoiding fire hazards.

Safe Fueling and Defueling Procedures

Detailed instructions for safe fueling and defueling operations, including ventilation and PPE.

Electrical Safety Precautions

Guidelines for safe handling of electrical components and isolation methods during maintenance.

Health and Environmental Safety

Vibration Effects and Prevention

Information on vibration-induced conditions like white finger and preventive measures.

Battery Safety and Handling

Risks associated with batteries and handling electrolyte leaks.

Battery Terminal Safety

Safety precautions when connecting/disconnecting battery terminals to prevent sparks.

Machine Usage Safety

Noise Hazards and Hearing Protection

Risks of hearing damage from machine noise and the importance of hearing protection.

Machine Operation Safety Rules

General safety rules for operating the machine, including unsuitable conditions.

Operating Environment and Training

Operating in Adverse Conditions

Safety advice for operating in low visibility or poor weather conditions.

Carbon Monoxide and Ventilation Risks

Hazards of carbon monoxide and importance of proper ventilation.

Operator Training and PPE Requirements

Need for training, manual use, and mandatory PPE for safe operation.

Part Locations

Component Identification and List

Visual identification and detailed list of all parts of the brushcutter.

Package Contents

Included Items in the Box

A complete list of all components provided in the product packaging.

Assembly Procedures

Assembly Safety and Preparation

Critical safety warnings and initial steps before starting assembly.

Handlebar and Shaft Assembly

Instructions for assembling the handle, adjusting the angle, and connecting shafts.

Head Attachments and Line Loading

Procedures for attaching trimmer/cutter heads and loading trimmer line.

Harness Attachment and Adjustment

Proper methods for wearing and adjusting the user harness for operation.

Fuel and Oil Management

Engine Oil Specification and Filling

Specifies engine oil type, capacity, and procedures for checking and filling.

Fuel Safety and Filling

Covers essential safety precautions for handling fuel and filling the tank.

Starting Procedures

Starting Procedure Warning

Reminder to check fluid levels before attempting to start the engine.

Starting from Cold Engine

Step-by-step guide for starting the brushcutter when the engine is cold.

Starting from Warm Engine

Procedure for starting the brushcutter when the engine is already warm.

Stopping Procedure

Engine Stop Procedure

Instructions on how to safely stop the engine of the brushcutter.

Using the Machine

Operational Safety and Precautions

Covers hot engine housing, stopping conditions, harness use, and general cutting safety.

Cutting Techniques and Kickback Avoidance

Provides tips on cutting methods and preventing kickback hazards.

Maintenance Guide

Safety, Spare Parts, and Schedule

Essential safety, parts, and schedule information for maintenance.

Component Servicing Procedures

Detailed steps for servicing the air filter, spark plug, oil, and fuel filter.

Transporting the Machine

Safe Transportation Guidelines

Instructions for safely transporting the machine, including fuel management.

Troubleshooting

Problem Diagnosis and Solutions

A table outlining common issues, their causes, and recommended remedies.

Storage Instructions

Long-Term Storage Preparation

Important instructions for preparing the machine for extended periods of storage.

Technical Specifications

Specifications of HY4BC31

A list of key technical data and specifications for the petrol brushcutter.

Recycling and Product Disposal

Disposal and Recycling Guidelines

Instructions for responsible disposal of the product, WEEE, and batteries.

Compliance and Recycling Resources

Information on manufacturer compliance schemes and recycling advice websites.

Declaration of Conformity

EC Conformity Declaration

Official declaration confirming the product's compliance with relevant EU directives.

Contact Details

Company Contact Information

Contact details for Genpower Ltd, including address, phone, and website.

Warranty Information

Warranty Registration Process

Guidance on how to register the machine to activate the manufacturer's warranty.

Manual Updates

Manual Information and Feedback

Information regarding manual revisions, error reporting, and modification policies.

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