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Cobra MT250C User Manual

Cobra MT250C
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Cobra MT250C Specifications

General IconGeneral
BrandCobra
ModelMT250C
CategoryTrimmer
LanguageEnglish

Summary

Attention Statements

DANGER!

Statement indicating an imminently hazardous situation resulting in death or serious injury if not avoided.

WARNING!

Statement indicating a potentially hazardous situation resulting in death or serious injury if not avoided.

CAUTION!

Information to avoid damage to the machine.

IMPORTANT!

Statement possessing special significance.

NOTE

Handy information that may make the job easier.

Introduction

IMPORTANT! Information Accuracy

Information accuracy and product changes disclaimer.

Safety Precautions

Electrical Shock Hazard

Warning against approaching or contacting electrical lines with the trimmer.

Related Manuals

Reference to owner's manual for specific maintenance/safety info.

Operating Precautions

General Safety Guidelines

Guidelines for safe operation including personal protective equipment and conduct.

Bystander Safety Distance

Keep bystanders at least 15 meters (50 feet) away from the operating trimmer.

Overhead Branch Cutting Warning

Never cut branches over your head due to risk of injury from falling objects.

Operator Fatigue and Alcohol Warning

Critical warnings about operation, fatigue, alcohol, and ventilation.

Equipment Operational Checks

Ensure cutter is installed, not damaged, and controls are working.

Fuel System Integrity Checks

Check for fuel leaks from tank, cap, pipe, and carburetor.

Installing the Powerhead

CAUTION! Component Damage

Do not force the lower tube into the powerhead to avoid component damage.

Assembly Steps

Detailed steps for attaching the powerhead to the tube assembly.

Connecting the Throttle Cable

Throttle Cable Connection

Connecting the throttle cable to the carburetor joint.

Switch Wire Connection

Connecting the switch wires between the engine and the main unit.

Adjusting the Throttle cable

Throttle Cable Adjustment Procedure

Adjusting throttle cable nuts to achieve proper free play.

Throttle Body Contact Check

Ensuring throttle contacts the stop on the throttle body at full throttle.

Assembling the Tube Sections

CAUTION! Tube Cleanliness

Keep tube ends clean and free of impurities during assembly.

Tube Assembly Steps

Steps for connecting powerhead/lower tube with upper tube assembly.

Disassembling The Pole sections

Pole Section Disassembly Steps

Steps to release and separate pole sections.

Mixing Fuel

CAUTION! Fuel Mixture Requirements

Engine requires 25:1 unleaded gasoline and 2-cycle mixing oil.

WARNING! Fuel Handling Safety

Safety precautions for handling fuel, including fire risk and ventilation.

Fueling Procedure

Steps for safely refueling the machine.

IMPORTANT

Fuel Storage Recommendation

Mix only enough fuel for immediate needs; use stabilizer for longer storage.

Starting A Cold Engine-Restarting After Refueling

Control Positions (Cold Engine)

Setting throttle, ignition switch, and choke for cold start.

IMPORTANT START-STOP Switch

Description of the START-STOP switch function.

Control Positions (Warm Engine)

Setting throttle and ignition switch for warm start.

Cranking The Engine

WARNING! Startup Safety

Ensure cutting attachment is clear of obstructions during startup.

CAUTION! Starter Abuse

Warnings about damaging the recoil starter.

Cranking Procedure

Steps for pulling the starter handle to engage and start the engine.

Engine Starts Or Fires

Action to take after the engine starts, like opening the choke.

Engine Starting Issues

Engine Stalled After Start

Repeat starting procedure if engine stops after initial start.

Engine Fails to Start

Procedure if the engine fails to start after repeated attempts.

Starting A Flooded Engine

Steps to clear excess fuel from a flooded engine.

CAUTION! Spark Plug Installation

Incorrect spark plug installation can cause serious engine damage.

Stopping The Engine

WARNING! Attachment Rotation

Cutting attachment may continue rotating after the engine is switched off.

Engine Stopping Procedure

Steps to properly stop the engine.

Adjusting The Carburetor

WARNING! Idle Speed Rotation

Cutting attachment must never rotate at engine idle speed.

Idle Speed Adjustment Procedure

Procedure for checking and adjusting engine idle speed.

Tachometer Use for Idle Setting

Using a tachometer for accurate idle speed setting.

Carburetor Mixture Note

Carburetor mixture cannot be adjusted.

Safety Operation

Pre-Operation Preparations

Steps before operating, including clothing and starting the engine.

Cutting Branch Sequence

Techniques for cutting branches efficiently.

Optimal Working Position

Recommended grip and angle for comfortable operation.

General maintenance

WARNING! Maintenance Safety

Ensure engine and attachment are stopped and spark plug wire disconnected before maintenance.

WARNING! Non-Standard Parts

Using non-standard parts may cause damage or injury.

Muffler Warnings

Warnings about operating without a muffler or with a damaged one.

Spark Plug Maintenance

Keep the spark plug and wire connections tight and clean.

Daily maintenance

Pre-Work Checks

Cleaning dirt, checking cooling fins and air cleaner.

10-Hour Maintenance

CAUTION! Air Cleaner Condition

Do not operate with damaged or wet air cleaner element.

10-Hour Cleaning Procedure

Steps for cleaning the air cleaner element.

10/15-Hour Maintenance

CAUTION! Spark Plug Area Cleaning

Clean spark plug area before removal to prevent dirt entry.

Spark Plug Cleaning and Adjustment

Procedure for cleaning and gapping the spark plug.

Specifications

General Specifications

Details on weight, engine type, displacement, speed, output, and capacity.

Noise and Vibration Levels

Measured sound power and vibration levels according to ISO standards.

BRUSH CUTTER

1. PARTS LOCATION

Diagram and list of brush cutter components.

2. Warning labels on the machine

Label Descriptions

Explanation of the meaning of various warning labels on the machine.

IMPORTANT! Seal Replacement

Procedure for replacing peeled or soiled warning seals.

WARING! Unauthorized Remodeling

Warning against remodeling the brush cutter.

3. Symbols on the machine

4. Safety precautions

Before using the machine

Pre-operation checks and safety guidelines, including manual reading and avoiding misuse.

Operating Environment Precautions

Warnings about operating in slippery conditions, fog, or storms.

Worker Fatigue Management

Advice on limiting continuous use and taking rests to prevent exhaustion.

WARNING CONSIDERING HANDLING OF FUEL

Fuel Storage and Refueling Safety

Precautions for storing fuel and refueling, avoiding heat and sparks.

Smoking Prohibition

Extremely dangerous to smoke while operating or refilling the brush cutter.

Spillage Cleanup Procedure

Procedure for cleaning up spilled fuel before restarting the engine.

THINGS TO CHECK BEFORE USING YOUR BRUSH CUTTER

Pre-work Area Obstacle Check

Inspecting the work area for obstacles and clearing them.

Obstacles and Pre-Start Checks

Hazardous Area Definition

Defining a 15m hazardous area around the brush cutter during use.

Pre-Operation Component Checks

Checking for loose parts, leaks, and blade condition.

Blade Condition and Sharpness

Ensuring blades are sharp and not damaged.

NOTES ON STARTING THE ENGINE

Pre-Start Obstacle Clearance

Ensure obstacles are within 15m of the brush cutter before starting.

Starting Position and Throttle Setting

Placing the cutter on the ground and setting throttle to idling position.

Post-Start Rotation Check

Checking if blades rotate after engine start and throttle release.

KICKBACK SAFETY PRECAUTIONS

Kickback Definition and Avoidance

Understanding and avoiding kickback from blade contact with objects.

OPERATION SAFETY PRECAUTIONS

Grip, Posture, and Balance

Gripping handles firmly and maintaining a steady posture and balance.

Engine Speed Control

Maintaining engine speed appropriate for cutting work.

Action on Obstruction or Refueling

Stopping the engine for grass obstruction or refueling.

Blade Contact with Hard Objects

Stopping engine and checking blade if it touches a hard object.

Safe Turning Procedure

Turning off the engine before turning around while working.

Electrical Shock Hazard Warning

Do not touch spark plug or cord while the engine is operating.

Burn Hazard Warning

Avoid touching muffler or engine parts immediately after shutdown.

Moving Between Work Locations

Turning off the engine and positioning the blade away from the body when moving.

MAINTENANCE SAFETY PRECAUTION

Regular Maintenance Schedule

Perform maintenance at regular intervals as described in the manual.

WARNING! Unauthorized Modifications

Never disassemble or modify the brush cutter; contact dealer for repairs.

5.SET UP

HANDLE Installation

Instructions for fixing the handle with bolts.

INSTALL GEARCASE

Steps for loosening screws, inserting pipe, and fastening clamp.

■ SAFETY GUARD

Safety Guard Attachment

Attaching the safety guard to the gear case.

INSTALLING THE METAL BLADE

Metal Blade Installation Steps

Steps for installing the inner holder, blade, and outer holder.

■ INSTALLING THE NYLON CUTTER (OPTION)

Nylon Cutter Installation Steps

Steps for installing the nylon cutter assembly.

NOTE! Bolt and Washer Handling

Keep bolts and washers safe during installation.

Stopping The engine

WARNING! Attachment Rotation

Cutting attachment may continue rotating after the engine is switched off.

Strap Wearing Instructions

Instructions for wearing and adjusting the strap for safe operation.

Emergency Strap Release

How to quickly release the machine from the strap in an emergency.

■ CUTTING OPERATION

METAL BLADE USAGE Techniques

Techniques for using the metal blade, including cutting direction and speed.

IMPORTANT! Low Speed Operation

Operating at low speed can cause issues with blades catching.

NYLON CUTTER USAGE

Techniques for using the nylon cutter, including cord power and speed.

8. MAINTENANCE

BLADE MAINTENANCE

Sharpening the blade and avoiding water cooling during grinding.

GEAR CASE MAINTENANCE

Lubricating the gear case with multi-purpose grease.

MAINTENANCE BEFORE STORAGE

Pre-Storage Cleaning and Checks

Brushing off dirt, checking for damage, and repairing abnormalities.

Fuel Extraction for Storage

Extracting fuel from the tank and running the engine dry before storage.

Engine Oil Treatment Before Storage

Adding oil to the cylinder and turning the starter rope.

Anti-rust Treatment for Storage

Applying anti-rust oil to metal parts and storing indoors.

9. SPECIFICATION

Brush cutter B250 Specifications

Details on weight, engine type, displacement, speed, output, and capacity.

Grass trimmer G250 Specifications

Details on weight, engine type, displacement, speed, output, and capacity.

POLE PRUNER

CAUTION! Pole Pruner Care

Maintaining the pole pruner according to the manual and safety guidelines.

Safety Device Integrity

Never modify or disable safety devices; use genuine parts.

Engine Operation Limits

Avoid running the engine at high RPM without a load to prevent damage.

Transport Safety

Securely tie down the pruner during transport to prevent spills or damage.

Refueling Precautions

Stop engine, allow to cool, avoid overfilling, and wipe spills.

Muffler and Spark Arrestor Safety

Never run without spark arrestor screen; avoid flammable material near muffler.

Work Area Preparation

Clear work area of debris for good footing.

Chain Maintenance

Keep the saw chain sharp and properly adjusted.

Cleaning

Keep the pruner clean and free of vegetation, mud, etc.

Product Description

Prior to Assembly

Familiarize with components before assembly for performance and safety.

IMPORTANT! Directional Terms

Definition of directional terms used in the manual.

WARNING! Modifications

Do not make unauthorized modifications or alterations to the pruner.

Use unit without upper tube

Operation Without Upper Tube

Instructions for removing the upper tube and attaching the gearcase to the lower tube.

Installing and Adjusting the Bar and China

WARNING! Engine Running

Never attempt chain installation with the engine running.

WARNING! Sharp Chain Handling

Wear gloves to protect hands when handling the sharp saw chain.

NOTE! Chain Soaking

Soak new or replacement chain loops in oil overnight for longest life.

Sprocket Cover Removal

Using plug wrench to remove sprocket cover nut and cover.

Guide Bar and Chain Alignment

Placing guide bar and aligning chain tensioning pin with hole.

CAUTION! Alignment Failure

Failure to align can cause serious damage to components.

WARNING! No Sprocket Cover

Never operate the pole pruner without the sprocket cover installed.

Adjusting the Chain

WARNING! Chain Adjustment Safety

Never attempt chain adjustment with the engine running.

CAUTION! Loose Chain Risk

A loose chain can jump off, causing damage; check often, especially with new chains.

IMPORTANT! Chain Adjustment Essentials

Proper chain adjustment is essential for performance, life, and safety.

Chain Tensioning Procedure

Steps for adjusting chain tension by turning the screw and lifting the guide bar.

Chain Oiler

WARNING! Oiler Adjustment Safety

Never fill oil reservoir or adjust oiler with the engine running.

IMPORTANT! Lubrication Importance

Service life depends on lubricant; use genuine oil or mix with kerosene for cold weather.

Filing The Oil Reservoir

Procedure for filling the oil reservoir with bar and chain oil.

Adjusting Oil Flow Rate

CAUTION! Oil Flow Rate

Increased flow speeds consumption; check level frequently.

Oil Flow Adjustment Procedure

Steps for adjusting the oil flow rate using the adjusting screw.

CAUTION! Adjusting Screw Use

Press adjusting screw slightly before turning to avoid pump damage.

Typical applications

Standard Cut

Convenient working position with a tool angle of 60°.

Cutting above obstacles

Pruning branches overhanging obstacles like rivers or lakes.

Cutting on a work platform

Cutting next to the trunk without damaging the work platform.

Working techniques

Relieving cut

Performing an undercut to prevent bark tearing, kickback, or pinching.

Flush-cutting thick branches

Techniques for cutting thick branches using undercut and cross-cuts.

50-hour Maintenance

Cooling Fins and Sprocket Inspection

Remove and clean cylinder cover, cooling fins, and inspect sprocket for wear.

Gearcase Lubrication

Lubricate the gearcase using lithium-base grease.

CAUTION! Fuel Line Integrity

Do not pierce fuel line with hooked wire; it is delicate and can be damaged.

Fuel Filter Inspection

Inspect fuel filter element for contamination and check fuel line for damage.

Sharpening the Chain

Chain Sharpening Basics

Re-sharpen dull edges with a file, ensuring equal sharpening for balance.

IMPORTANT! Sharpening Instructions

File all cutters to the same angle and depth to prevent vibration.

Filing Guide Recommendation

Using a filing guide for consistent angles.

Depth Gauge Adjustment

Lowering depth gauges to 0.5mm using a flat file.

Correct Filing Technique

Top Plate Angle

Correct angle for top plate filing to ensure proper cutting.

Depth Gauge Height

Ensuring top of depth gauge is at correct height below top plate.

Filling Problems

Top plate angle less than recommended

Filing at too shallow an angle results in slow cutting.

Hook in side plate cutting edge

Filing too low or with wrong file size can cause rough cutting.

High depth gauge

Undersized depth gauge causes slow cutting and wear.

Top plate angle more than recommended

Filing at too steep an angle results in sharp but fast-dulling cutters.

Back slope on side plate cutting edge

Incorrect side plate angle leads to cutters not feeding into wood.

Low depth gauge

Wrong depth gauge setting leads to rough cutting and chain grab.

HEDGE TRIMMER

WARNING! Transport and Storage Safety

Never transport or set down with engine running; use blade cover.

CAUTION! Hedge Trimmer Care

Maintain according to manual, do not modify safety devices, use genuine parts.

Work Area and Cutter Maintenance

Clear work area, keep cutters sharp and properly adjusted.

Cleaning and Debris Removal

Keep the hedge trimmer clean and free of vegetation, mud, etc.

Product description

Prior to assembly

Familiarize with components before assembly for performance and safety.

IMPORTANT! Directional Terms

Definition of directional terms used in the manual.

WARNING! Modifications Prohibited

Do not make unauthorized modifications or alterations to the hedge trimmer.

Installing the Hedge Trimmer Cutter Assembly

WARNING! Sharp Blades

Cutter blades are sharp; do not handle without protective cover.

IMPORTANT! Wear Gloves

Always wear gloves when working with or near the cutter assembly.

Cutter Assembly Installation

Steps for removing output shaft and inserting into gearbox.

Working head rotation

Changing head position only when the engine is not operating.

Gearbox Grease Procedure

Procedure for greasing the gearbox after 25 hours of run time.

Safety Operation

Applications and Preparations

Machine designed for trimming hedges; wear protective clothing and equipment.

Cutting sequence

Cut thick branches first; use multiple passes for radial cuts.

Cutting Techniques

Vertical cut

Swing cutting blade up and down in an arc along the hedge.

Horizontal cut

Hold blade at 0-10° angle and swing horizontally along the hedge.

Cutting Method Illustrations

Horizontal Cut (Ground)

Cutting close to ground from a standing position for low shrubs.

Overhead Cut

Cutting upper hedge surface with shaft upright and 90° blade angle.

Vertical Cut (Next to Hedge)

Cutting without standing directly next to hedge, e.g., flowerbeds.

Horizontal Cut (In Front of Hedge)

Cutting without standing directly in front of hedge, reaching over obstacles.

Operating the Articulated Hedge Trimmer

Head Injury Protection

Always wear a hard hat to reduce risk of head injuries.

Hair and Eye Protection

Secure long hair and wear eye/hearing protection; consider a face shield.

Glove and Clothing Recommendations

Wear non-slip gloves, snug-fitting clothes; never wear shorts.

Operating Grip and Balance

Operate with both hands, maintain proper footing and balance.

Bystander Safety Distance

Keep bystanders at least 15 meters away to reduce risk from moving blades or debris.

Footwear Recommendation

Wear sturdy footwear with non-slip soles; steel-toed boots recommended.

EC-DECLARATION OF CONFORMITY

EC Declaration of Conformity

Statement of compliance with EC safety and health requirements.

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