MTD 41ADY90C401 Le manuel du propriétaire

Marque: MTD

Modèle: 41ADY90C401

Catégorie: Coupe-herbe

Taper: Le manuel du propriétaire

Ce manuel convient également à

YM90

English

Operator’s Manual

IMPORTANT: Read safety rules and instructions carefully before operating equipment.

PRINTED IN U.S.A.

PART NO. 769-00573 (12/02)

2-Cycle Trimmer/

Brushcutter

Model

YM90

TABLE OF CONTENTS

Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page

Rules for Safe Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Know Your Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Oil and Fuel Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Starting/Stopping Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Maintenance and Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Cleaning and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Inside Back Cover

FINDING MODEL NUMBER

This Operator’s Manual is an important part of your new trimmer. It will help you assemble, prepare and maintain the

unit for best performance. Please read and understand what it says.

Before you start assembling your new equipment, please locate the model plate on the unit and

copy the information from it onto the space provided below. The information on the model plate is very

important if you need help from our Customer Support Department or an authorized dealer.

• The model number is located on the engine. A sample model plate is shown and explained below. For future

reference, please copy the model number and the serial number of the equipment in the space provided.

CALLING CUST

OMER SUPPOR

If you have difficulty assembling this product or have any questions regarding the controls, operation or maintenance of

this unit, please call the Customer Support Department.

Call 1- (800)-345-8746, or 1- (800)-668-1238 in Canada, to reach a Customer Support representative.

Please have your unit’s model number and serial number ready when you call. You will be asked to

enter the serial number in order to process your call. This information is explained above.

VISIT OUR

WEB SITE

Visit our web site at www.yardman.com for more information about our quality Yard Man products, customer service,

parts, tips, literature and more.

Copy the model and parent

part number here:

Copy the serial number here:

S/N :

ITEM :

MODEL :

SPARK ARRESTOR

NOTE: For users on U.S. Forest Land and in the states of California, Maine, Oregon and Washington. All U.S.

Forest Land and the state of California (Public Resources Codes 4442 and 4443), Oregon and Washington require, by

law that certain internal combustion engines operated on forest brush and/or grass-covered areas be equipped with a

spark arrestor, maintained in effective working order, or the engine be constructed, equipped and maintained for the

prevention of fire. Check with your state or local authorities for regulations pertaining to these requirements. Failure to

follow these requirements could subject you to liability or a fine. This unit is factory equipped with a spark arrestor.

If it requires replacement, ask your LOCAL SERVICE DEALER to install the accessory part #182747 Spark Arrestor.

ARNING!

Read the Operator’s Manual and follow all warnings and safety instructions. Failure to do so can

result in serious injury to the operator and/or bystanders.

FOR QUESTIONS, CALL 1-800-345-8746 IN U.S. OR 1-800-668-1238 in CANADA

The purpose of safety symbols is to attract your attention to possible dangers. The safety symbols and

their explanations deserve your careful attention and understanding. The safety warnings do not by

themselves eliminate any danger. The instructions or warnings they give are not substitutes for proper

accident prevention measures.

SAFETY ALERT SYMBOL: Indicates danger, warning, or caution. Attention is required in order to avoid

serious personal injury. May be used in conjunction with other symbols or pictographs.

NOTE: Advises you of information or instructions vital to the operation or maintenance of the equipment.

DANGER: Failure to obey a safety warning will result in serious injury to yourself or to others. Always

follow the safety precautions to reduce the risk of fire, electric shock and personal injury.

WARNING: Failure to obey a safety warning can result in injury to yourself and others. Always follow

the safety precautions to reduce the risk of fire, electric shock and personal injury.

CAUTION: Failure to obey a safety warning may result in property damage or personal injury to

yourself or to others. Always follow the safety precautions to reduce the risk of fire, electric shock and

personal injury.

SECTION 1: IMPORTANT SAFE OPERATION PRACTICES

READ ALL INSTRUCTIONS

WARNING: When using the unit, you must

follow the safety rules. For your own safety

and that of bystanders, please read these

instructions before operating the unit.

Please keep the instructions for later use.

Before Operating

• Read the instructions carefully. Be familiar with the

controls and proper use of the unit.

• Do not operate this unit when tired, ill or under the

influence of alcohol, drugs or medication.

SECTION 1a:RULES FOR SAFE OPERATION

WARNING

California Proposition 65 Warning:

THE ENGINE EXHAUST FROM THIS

PRODUCT CONTAINS CHEMICALS

KNOWN TO THE STATE OF CALIFORNIA

TO CAUSE CANCER, BIRTH DEFECTS

OR OTHER REPRODUCTIVE HARM.

• Be aware of risk of injury to the head, hands and feet.

• Clear the area to be cut before each use. Remove

rocks, broken glass, nails, wire, string and other

objects which may be thrown or become entangled in

the cutting attachment. Clear the area of children,

bystanders and pets; keep them outside a 50-foot

(15 m.) radius, at a minimum. Even then, they are still

at risk from thrown objects. Encourage bystanders to

wear eye protection. If you are approached, stop the

unit immediately.

• Squeeze the throttle control and check that it returns

automatically to the idle position. Make all adjustments

or repairs before using the unit.

Safety Warnings for Gas Trimmers

WARNING: Gasoline is highly flammable,

and its vapors can explode if ignited. Take

the following precautions:

• Store fuel only in containers specifically designed and

approved for the storage of such materials.

• Always stop the engine and allow it to cool before

filling the fuel tank. Never remove the fuel tank cap or

add fuel when the engine is hot. Never operate the unit

without the fuel cap securely in place. Loosen the fuel

tank cap slowly to relieve any pressure in the tank.

• Add fuel in a clean, well-ventilated outdoor area where

there are no sparks or flames. Remove the fuel cap

slowly, and only after the engine stops. Do not smoke

while fueling or mixing fuel. Wipe up any spilled fuel

from the unit immediately.

• Avoid creating a source of ignition for spilled fuel. Do

not start the engine until fuel vapors dissipate.

• Move the unit at least 30 feet (9.1 m) from the fueling

source and site before starting the engine. Do not

smoke. Keep sparks and open flames away from the

area while adding fuel or operating the unit.

While Operating

• Never start or run the unit inside a closed room or

building. Breathing exhaust fumes can be fatal.

Operate this unit only in a well-ventilated outdoor area.

• Wear safety glasses or goggles that meet ANSI Z87.1

standards and are marked as such. Wear ear/hearing

protection when operating this unit. Wear a face or

dust mask if the operation is dusty.

• Wear heavy long pants, boots, gloves and a long

sleeve shirt. Do not wear loose clothing, jewelry, short

pants, sandals or go barefoot. Secure hair above

shoulder level.

• The cutting attachment shield must always be in place

while operating the unit. Do not operate unit without

both trimming lines extended, and the proper line

installed. Do not extend the trimming line beyond the

length of the shield.

• This unit has a clutch. The cutting attachment remains

stationary when the engine is idling. If it does not, have

the unit adjusted by an authorized service technician.

• Adjust the J-handle to your size in order to provide the

best grip.

• Be sure the cutting attachment is not in contact with

anything before starting the unit.

• Use the unit only in daylight or good artificial light.

• Avoid accidental starting. Remain in the starting

position whenever pulling the starter rope. The

operator and unit must be in a stable position while

starting. Refer to Starting/Stopping Instructions.

• Use the right tool. Only use this tool for its intended

purpose.

• Do not overreach. Always keep proper footing and

balance.

• Always hold the unit with both hands when operating.

Keep a firm grip on both handles or grips.

• Keep hands, face, and feet at a distance from all

moving parts. Do not touch or try to stop the cutting

attachment when it rotates.

• Do not touch the engine, gear housing or muffler.

These parts get extremely hot from operation, even

after the unit is turned off.

• Do not operate the engine faster than the speed

needed to cut, trim or edge. Do not run the engine at

high speed when not cutting.

• Always stop the engine when cutting is delayed or

when walking from one cutting location to another.

• If you strike or become entangled with a foreign

object, stop the engine immediately and check for

damage. Do not operate before repairing damage. Do

not operate the unit with loose or damaged parts.

• Stop the unit, switch the engine to off, and disconnect

the spark plug for maintenance or repair.

• Use only Genuine Factory Parts™ replacement parts

and accessories for this unit. These are available from

your authorized service dealer. Use of any unauthorized

parts or accessories could lead to serious injury to the

user, damage to the unit, and a voided warranty.

• Keep unit clean of vegetation and other materials.

They may become lodged between the cutting

attachment and shield.

• Children under the age of 15 must not use the unit;

teens may operate the unit with adult guidance.

• Inspect the unit before use. Replace damaged parts.

Check for fuel leaks. Make sure all fasteners are in

place and secure. Replace cutting attachment parts

that are cracked, chipped or damaged in any way.

Make sure the cutting attachment is properly installed

and securely fastened. Be sure that the cutting

attachment shield is properly attached, and positioned

as recommended. Failure to do so can result in

personal injury to the operator and bystanders, as well

as damage to the unit.

• Use only 0.095-inch (2.41 mm) diameter Genuine

Factory Parts™ replacement line. Never use metal-

reinforced line, wire, chain or rope. These can break

off and become dangerous projectiles.

• To reduce fire hazard, replace a faulty muffler and

spark arrestor. Keep the engine and muffler free from

grass, leaves, excessive grease or carbon build up.

While Operating with the Cutting Blade

• Read and understand all safety warnings before

operating this unit.

• Always use the shoulder harness when using the

brush blade accessory.

• Keep the J-handle between the operator and cutting

attachment or blade at all times.

• NEVER cut with the cutting blade located over 30

inches (76 cm) or more above the ground level.

• Blade thrust may occur when the spinning blade

contacts an object that it does not immediately cut.

Blade thrust can be violent enough to cause the unit

and/or operator to be propelled in any direction , and

possibly lose control of the unit. Blade thrust can

occur without warning if the blade snags, stalls or

binds. This is more likely to occur in areas where it is

difficult to see the material being cut.

• For operation with the brush blade, do not cut

anything thicker than 1/2 inch or a violent kickback

could occur.

• Do not attempt to touch or stop the blade when it is

rotating.

•A coasting blade can cause injury while it continues to

spin after the engine is stopped or the throttle trigger

is released. Maintain proper control until the blade has

completely stopped rotating.

• Do not run the unit at high speed when not cutting.

• If you strike or become entangled with a foreign

object, stop the engine immediately and check for

damage. Have any damage repaired before attempting

further operations. Do not operate unit with a bent,

cracked or dull blade. Discard blades that are bent,

warped, cracked or broken.

• Do not sharpen the cutting blade. Sharpening the blade

can cause the blade tip to break off while in use. This can

result in severe personal injury. Replace the blade.

• Do not use the cutting blade for edging or as an

edger, severe personal injury to yourself or others can

occur. Use the cutting blade only for the purpose as

described in this manual.

•Stop the engine IMMEDIATELY if you feel excessive

vibration. Vibration is a sign of trouble. Inspect thoroughly

for loose nuts, bolts or damage before continuing. Repair

or replace affected parts as necessary.

After Use

• Clean cutting blades with a household cleaner to

remove any gum buildup. Oil the blade with machine

oil to prevent rust.

• Lock up and store the cutting blade in an appropriate area

to protect the blade from unauthorized use or damage.

Other Safety Warnings

• Never store a fueled unit inside a building where fumes

may reach an open flame or spark.

• Allow the engine to cool before storing or transporting.

Be sure to secure the unit while transporting.

• Store the unit in a dry area, locked up or up high to

prevent unauthorized use or damage, out of the reach

of children.

• Never douse or squirt the unit with water or any other

liquid. Keep handles dry, clean and free from debris.

Clean after each use, see Cleaning and Storage

instructions.

• Keep these instructions. Refer to them often and use

them to instruct other users. If you loan someone this

unit, also loan them these instructions.

SAVE THESE INSTRUCTIONS

SECTION 1b:SAFETY & INTERNATIONAL SYMBOLS

This operator's manual describes safety and international symbols and pictographs that may appear on this product.

Read the operator's manual for complete safety, assembly, operating and maintenance and repair information.

SYMBOL MEANING

• ON/OFF STOP CONTROL

OFF or STOP

• THROWN OBJECTS AND

ROTATING CUTTER CAN

CAUSE SEVERE INJURY

WARNING:

Do not operate without

the cutting attachment shield in place.

Keep away from the rotating cutting

attachment.

• HOT SURFACE WARNING

Do not touch a hot muffler, gear housing

or cylinder. You may get burned. These

parts get extremely hot from operation.

They remain hot for a short time after the

unit is turned off.

• SHARP BLADE

WARNING: Sharp blade on cutting

attachment shield. To prevent serious

injury, do not touch line cutting blade.

• BRUSHCUTTERS • REPLACE

DULL BLADE

Do not sharpen the cutting blade.

Sharpening the blade can cause the

blade tip to break off while in use. This

can result in severe personal injury.

•TRIMMER/BRUSHCUTTER

SAFETY

WARNING: Thrown objects and

rotating cutter can cause severe injury.

Keep bystanders, especially children

and pets, at least 50 feet (15 m) away

from the cutting area. The cutting

attachment shield must be used when

using the trimmer cutting attachment.

SYMBOL MEANING

• SAFETY ALERT SYMBOL

Indicates danger, warning or caution.

May be used in conjunction with other

symbols or pictographs.

•WARNING - READ

OPERATOR'S MANUAL

Read the operator’s manual(s) and follow

all warnings and safety instructions.

Failure to do so can result in serious injury

to the operator and/or bystanders.

• WEAR EYE AND HEARING

PROTECTION

WARNING:

Thrown objects and loud

noise can cause severe eye injury and

hearing loss. Wear eye protection

meeting ANSI Z87.1 standards and ear

protection when operating this unit.

Use a full face shield when needed.

•KEEP BYSTANDERS AWAY

WARNING:

Keep all bystanders,

especially children and pets, at least

50 feet (15 m) from the operating area.

• UNLEADED FUEL

Always use clean, fresh unleaded fuel.

• OIL

Refer to operator's manual for the

proper type of oil.

•ON/OFF STOP CONTROL

ON / START / RUN

SECTION 2: KNOW YOUR UNIT

Cutting Attachment

Shield

Fuel Cap

Throttle

Control

Throttle

Lock-Out

J-Handle

Cutting Attachment

Gear Housing

Shaft Grip

Primer Bulb

EZ-Start™

Lever

Air Filter/Muffler

Cover

Engine Stand

Spark Plug

On/Off Stop Control

Shaft

Housing

Starter Rope Grip

EZ-Link™

Blade Shield /

Shield Mount

Brush

Blade

Line Cutting Blade

Spark Plug

Muffler

Shoulder Strap Clip

Applications

As a trimmer:

• Cutting grass and light weeds

• Edging

• Decorative trimming around trees, fences, etc.

As a brushcutter:

• Cutting weeds and light bush of up to 1/2 inch

in diameter

Other optional accessories may be used with the

YM90. Refer to Operating the EZ-Link System for a

list of add-ons.

SECTION 3: ASSEMBLY INSTRUCTIONS

Installing and Adjusting the J-handle

1. Place the J-handle between the top and middle

clamp pieces. See Figure 1.

2. While holding the three pieces together, install the four

(4) screws through the top clamp and into middle clamp.

NOTE: The holes in the top and middle clamp will line up

only when assembled correctly.

3. Place the clamps and the J-handle over the shaft

housing and onto the bottom clamp.

4. Hold each hex nut in the bottom clamp recess with a

finger. Start screws with a large Phillips screwdriver.

Do not tighten until you make the handle adjustment.

5. Slide the J-handle in or out until the arrow/white line on the

decal touches the clamp assembly.

See Figure 2.

You

must first loosen the screws if the handle is pre-installed.

Figure 3

Figure 4

6. While holding the unit in the operating position,

arrange the J-handle to the location that provides you

the best grip. See Figure 3.

7. Tighten the clamp screws evenly, until the J-handle

is secure.

(4) Screws

Top Clamp

J-Handle

Middle Clamp

Bottom Clamp

Nuts

Decal

Figure 2

Figure 1

Support Fitting

Remove and Install the Cutting Attachment

Shield

Remove the cutting attachment shield when using the

unit as a brushcutter

Remove the cutting attachment shield from the shield

mount by removing the three (3) screws with a flat blade

screwdriver. See Figure 7. Store parts for future use.

Install the Harness

1. Push the strap through the center of the buckle.

2. Pull the strap over the cross bar and down through

the slot in the buckle. See Figure 4.

3. Put the harness on over head and onto shoulder.

Snap it on to the support fitting. See Figure 5.

4. Adjust length to fit the operator’s size. Pull tab to

lengthen, pull strap to shorten. See Figure 6.

WARNING: Always use the shoulder

harness when using the cutting blade to

avoid serious personal injury.

Figure 6

WARNING: The cutting attachment shield

should NOT be installed when operating the

unit with a blade. Remove the cutting

attachment shield before removing or

installing the blade.

Figure 5

Install the cutting attachment shield when using the unit

as a grass trimmer

Install the cutting attachment shield on the shield mount by

inserting the three (3) screws into the shield mount. Tighten

securely with a flat blade screwdriver. See Figure 7.

Remove the Cutting Attachment & Install

the Cutting Blade

NOTE: To make cutting blade removal and installation easier,

place the unit on the ground or on a work bench

Remove the Cutting Attachment Shield

See Remove and Install the Cutting Attachment Shield.

Remove the Cutting Attachment

1. Align the shaft bushing hole with the locking rod slot

and insert the locking rod into the shaft bushing hole.

See Figure 8.

(3) Screws

Cutting

Attachment

Shield

Shield Mount

Gear Housing

Cutting Attachment

Locking Rod

Slot

Locking Rod

Shaft Bushing Hole

Locking Rod Slot

Output Shaft

Bushing

Locking Rod

Output Shaft

2. Hold the locking rod in place by grasping it next to

the boom of the unit. See Figure 9.

3. While holding the locking rod, remove the cutting

attachment by turning it clockwise off of the output shaft.

See Figure 10.

Store the cutting attachment for future use.

NOTE: The blade retainer under the cutting attachment

will be used when installing the cutting blade.

Install the Cutting Blade

4. Place the cutting blade on the output shaft bushing.

See Figure 11.

Shield

Mount

Locking Rod

Cutting

Blade

Blade Retainer

Nut

Output Shaft

Bushing

Pilot Hole

SECTION 3: ASSEMBLY INSTRUCTIONS

WARNING: To avoid serious personal

injury, the cutting attachment shield MUST

be in place at all times while operating the

unit as a grass trimmer.

WARNING: The gear housing gets hot with

use. It can result in injury to the operator.

The housing remains hot for a short time

even after the unit is turned off. Do not

touch the gear housing until it has cooled.

WARNING:

To avoid serious personal

injury, always wear gloves while handling or

installing the blade.

Figure 10

Figure 9

Figure 8

Figure 7

Figure 11

SECTION 3: ASSEMBLY INSTRUCTIONS

Pilot Step

Remove the Cutting Blade & Install the

Cutting Attachment

Remove the Cutting Blade

1. Align the shaft bushing hole with the locking rod slot and

insert the locking rod into the bushing hole. See Figure 8

2. Hold the locking rod in place by grasping it next to

the boom of the unit. See Figure 14.

3. While holding the locking rod, loosen the nut on the

blade by turning it clockwise with a 5/8 inch closed-

end or socket wrench. See Figure 14.

9. Remove the locking rod from the locking rod slot.

1/4-1/2 turn

Counterclockwise

6. Align the shaft bushing hole with the locking rod

slot and insert the locking rod into the bushing hole.

See Figure 8.

7. Put the blade retainer and nut on the output shaft.

Make sure that the blade is installed correctly.

8. Tighten nut counterclockwise against the blade while

holding the locking rod:

• If using a torque wrench and an 5/8 inch socket tighten

to: 325 - 335 in•lb, 27 - 28 ft.•lb, 37 - 38 N•m.

• Without a torque wrench, use a 5/8 inch closed-end or

socket wrench, turning the nut until the blade retainer is

snug against the shaft bushing. Make sure that the blade

is installed correctly, then rotate the nut an additional 1/4

to 1/2 turn counterclockwise. See Figure 13.

Cutting Attachment

Locking Rod

Clockwise

6. Remove the locking rod.

7. Install the cutting attachment shield. Refer to Remove

and Install the Cutting Attachment Shield.

Blade Retainer

Output Shaft

Bushing

5. Make sure that the cutting blade is centered on the

pilot step and sitting flat against the output shaft

bushing. See Figure 12.

4. Remove the nut, blade retainer and blade. Store the

nut and blade together for future use in a secure

place. Store out of children’s reach.

Install the Cutting Attachment

Align the shaft bushing hole with the locking rod slot and

insert the locking rod into the shaft bushing hole.

See

Figure 8.

Place the blade retainer on the output shaft

with the flat surface against the output shaft bushing.

See

Figure 15.

Screw the cutting attachment

counterclockwise onto the output shaft. Tighten securely.

NOTE: The blade retainer must be installed on the output

shaft in the position shown for the cutting

attachment to work correctly.

WARNING:

To avoid serious personal

injury or damage to the unit, do not start or

operate this unit with the locking rod in the

locking rod slot.

WARNING: Do not sharpen the cutting blade.

Sharpening the blade can cause the blade tip

to break off while in use. This can result in

severe personal injury. Replace the blade.

WARNING: If the cutting blade is off-

center, the unit will vibrate and the blade

may fly off, causing possible serious

personal injury.

WARNING: To avoid serious personal

injury, the cutting head guard MUST be in

place at all times while operating the unit

as a trimmer.

WARNING: To avoid serious personal

injury, always wear gloves while handling or

installing the blade.

Figure 14

Figure 15

Figure 12

Figure 13

SECTION 4: OIL AND FUEL INFORMATION

WARNING: Gasoline is extremely

flammable. Ignited vapors may explode.

Always stop the engine and allow it to cool

before filling the fuel tank. Do not smoke

while filling the tank. Keep sparks and

open flames at a distance from the area.

WARNING: Remove fuel cap slowly to avoid

injury from fuel spray. Never operate the unit

without the fuel cap securely in place.

WARNING: Add fuel in a clean, well-

ventilated outdoor area. Wipe up any

spilled fuel immediately. Avoid creating a

source of ignition for spilled fuel. Do not

start the engine until fuel vapors dissipate.

NOTE: Dispose of the old fuel/oil mix in accordance to

Federal, State and Local regulations.

Oil and Fuel Mixing Instructions

Old and/or improperly mixed fuel is the main reason for

improper unit performance. Be sure to use fresh, clean

unleaded fuel. Follow the instructions carefully for the

proper fuel/oil mixture.

Definition of Blended Fuels

Today's fuels are often a blend of gasoline and

oxygenates such as ethanol, methanol, or MTBE (ether).

Alcohol-blended fuel absorbs water. As little as 1%

water in the fuel can make fuel and oil separate. It forms

acids when stored. When using alcohol-blended fuel,

use fresh fuel (less than 60 days old).

Using Blended Fuels

If you choose to use a blended fuel, or its use is

unavoidable, follow recommended precautions:

• Always use fresh fuel mix per your operator's manual

• Always agitate the fuel mix before fueling the unit

• Drain the tank and run the engine dry before storing

the unit

Using Fuel Additives

The bottle of 2-cycle oil that came with your unit

contains a fuel additive which will help inhibit corrosion

and minimize the formation of gum deposits. It is

recommended that you use only our 2-cycle oil with this

unit.

If unavailable, use a good 2-cycle oil designed for air-

cooled engines along with a fuel additive, such as

STA-BIL

Gas Stabilizer or an equivalent. Add 0.8 oz.

(23 ml.) of fuel additive per gallon of fuel according to the

instructions on the container. NEVER add fuel additives

directly to the unit's fuel tank.

CAUTION: For proper engine operation and

maximum reliability, pay strict attention to

the oil and fuel mixing instructions on the

2-cycle oil container. Using improperly mixed

fuel can severely damage the engine.

Thoroughly mix the proper ratio of 2-cycle engine oil with

unleaded gasoline in a separate fuel can. Use a 40:1 fuel/oil

ratio. Do not mix them directly in the engine fuel tank. See

the table below for specific gas and oil mixing ratios.

NOTE: One gallon (3.8 liters) of unleaded gasoline mixed

with one 3.2 oz. (95 ml.) bottle of 2-cycle oil

makes a 40:1 fuel/oil ratio.

UNLEADED GAS 2-CYCLE OIL

1 US. GALLON + 3.2 FL. OZ.

(3.8 LITERS) (95 ml)

1 LITER + 25 ml

MIXING RATIO - 40:1

SECTION 5: STARTING/STOPPING INSTRUCTIONS

WARNING: Operate this unit only in a well- ventilated

outdoor area. Carbon monoxide exhaust fumes can be

lethal in a confined area

WARNING: Avoid accidental starting. Make sure you are

in the starting position when pulling the starter rope.

See Figure 18. To avoid serious injury, the operator and

unit must be in a stable position while starting.

To avoid serious personal injury, ensure any Add-On

being used is installed correctly and secure before

starting unit.

Stopping Instructions

1. Release your hand from the throttle control.

See Figure 18. Allow the engine to cool

down by idling.

2. Push and hold the On/Off Stop Control in

the OFF (O) position until the engine stops

running. See Figure 16

On/Off Stop Control

Start/On (I)

Stop/Off (O)

Throttle Control

Starter Rope

Throttle Control

Primer

Bulb

EZ-Start™

Lever

Figure 18

Figure 17

Figure 16

Starting Instructions

IF... You are starting a warm engine, begin at step 4.

1. Mix gas with oil. Fill fuel tank with fuel/oil mixture.

See Oil and Fuel Mixing Instructions.

2. Make sure the On/Off Stop Control is in the ON (I)

position. See Figure 16.

3. Fully press and release the primer bulb 10 times,

slowly, until FUEL IS VISIBLE IN THE PRIMER

BULB. See Figure 17. If you can’t see fuel in the

bulb, press and release the bulb as many times as it

takes before you can see fuel in it.

4. Push the EZ-Start™ Lever to the left until it clicks and

locks into place. See Figure 17.

5. With the unit in the starting position, DO NOT

SQUEEZE THE THROTTLE CONTROL. See Figure

18. Pull the starter rope 5 times briskly, making sure the

EZ-Start™ lever is pushed to the left.

IF... The engine does not start, go back to step 3.

IF... The engine starts to run before the fifth pull, go to step 6.

IF... The outside temperature or engine temperature

exceeds 90º F and the engine fails to start after 5

pulls, fully squeeze the throttle control and pull the

starter rope briskly 3 to 8 more times. The engine

should start within these pulls.

NOTE: When starting, the EZ-Start™ Lever will automatically

click off when you squeeze the throttle control.

6. When the engine starts, squeeze the throttle control to

warm up the engine for 5 to 10 seconds. The EZ-

Start™ Lever will click off automatically. See Figure 17.

...

The engine stalls while squeezing the throttle, go

back to step 4.

IF... The engine stalls before you squeeze the throttle

control, hold the throttle control and pull the starter

rope until the trimmer starts.

Throttle Lock-Out

For edging (when using the line head cutting attachment

with EZ-Link™ models), lock the release button of the

cutting attachment into the 90° edging hole or the 180°

edging hole. See Figure 21.

Operating the EZ-Link™ System

The EZ-Link™ system enables the use of these optional

Add-Ons:

Blower/Vacuum . . . . . . . . . . . . . . . . . . . . . . . . . . BV720r

Cultivator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GC720r

Edger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LE720r

Hedge Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . HS720r

Snow Thrower . . . . . . . . . . . . . . . . . . . . . . . . . . . ST720r

Straight Shaft Trimmer . . . . . . . . . . . . . . . . . . . . SS725r

Tree Pruner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TP720r

Turbo Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . TB720r

Removing the Cutting Attachment or Add-Ons

1. Turn the knob counterclockwise to loosen. See Figure 19.

2. Press and hold the release button. See Figure 19.

3. While firmly holding the upper shaft housing, pull

the cutting attachment or add-on straight out of the

EZ-Link™ coupler. See Figure 20.

Installing the Cutting Attachment or Add-On

NOTE: Place the unit on the ground or on a work bench

to make add-on installation or removal easier.

1. Turn knob counterclockwise to loosen.

EZ-Link™ Coupler

Release Button

Guide Recess

Knob

Primary Hole

Upper Shaft Housing

EZ-Link™ Coupler

2. While firmly holding the add-on, push it straight into

the EZ-Link™ coupler. See Figure 20.

NOTE: Aligning the release button with the guide recess

will help installation. See Figure 19.

3. Turn the knob clockwise to tighten. See Figure 21.

Knob

Lower Shaft Housing

Release Button

90˚ Edging Hole

(Trimmer Only)

180˚ Edging Hole

(Trimmer Only)

CAUTION: Lock the release button in the

primary hole and securely tighten the knob

before operating this unit

SECTION 6: OPERATING INSTRUCTIONS

Figure 21

Figure 20

Figure 19

CAUTION:

The cutting attachment and add-

ons with the EZ-Link™ system are to be used

in the primary hole unless stated otherwise in

the specific add-ons operator’s manual.

Using the wrong hole could lead to personal

injury or damage to the unit.

WARNING: Read and understand the

operator’s manual for each add-on prior to

operation.

WARNING: To avoid serious personal injury

and damage to the unit, shut off the unit

before removing or installing add-ons.

Holding the Trimmer

WARNING: Always wear eye, hearing, foot

and body protection to reduce the risk of

injury when operating this unit.

Before operating the unit, stand in the operating

position. See Figure 22. Check for the following:

• The operator is wearing eye protection and proper

clothing

• With a slightly-bent right arm, the operator’s right hand

is holding the shaft grip

• The operator’s left arm is straight, the left hand holding

the J-handle

• The unit is at waist level

•

The cutting attachment is parallel to the ground and

easily contacts the grass without the need to bend ove

Once you are in the operating position, hook the

shoulder strap to the unit.

Adjusting Trimming Line Length

The Bump Head™ cutting attachment allows you to release

trimming line without stopping the engine. To release more

line, lightly tap the cutting attachment on the ground while

operating the trimmer at high speed. See Figure 23.

NOTE: Always keep the trimming line fully extended.

Line release becomes more difficult when the

cutting line gets shorter.

Each time the head is bumped, about 1 inch (25.4 mm)

of trimming line releases. A blade in the cutting

attachment shield will cut the line to the proper length if

any excess line is released.

For best results, tap the bump knob on bare ground or

hard soil. If you attempt a line release in tall grass, the

engine may stall. Always keep the trimming line fully

extended. Line release becomes more difficult when the

cutting line gets shorter.

NOTE: Do not rest the bump knob on the ground while

the unit is running.

CAUTION: Do not remove or alter the line

cutting blade assembly. Excessive line

length may make the unit overheat.

Some line breakage will occur from:

• Entanglement with foreign matter

• Normal line fatigue

• An attempt to cut thick, stalky weeds

•

Forcing the line into objects such as walls or fence posts

Tips for Best Trimming Results

• For best trimming results, operate unit at full throttle.

• Keep the cutting attachment parallel to the ground.

• Do not force the cutting attachment. Allow the tip of

the line to do the cutting, especially along walls.

Cutting with more than the tip will reduce cutting

efficiency and may overload the engine.

• Cut grass over 8 inches (200 mm) tall by working

from top to bottom in small increments to avoid

premature line wear or engine drag.

• Cut from left to right whenever possible. Cutting to

the right improves the unit's cutting efficiency.

Clippings are thrown away from the operator.

• Slowly move the trimmer into and out of the cutting

area at the desired height. Move either in a forward-

to-backward or side-to-side motion. Cutting shorter

lengths produces the best results.

• Trim only when grass and weeds are dry.

• The life of your cutting line is dependent upon:

• Following the trimming techniques

• What vegetation is being cut

• Where vegetation is cut

For example, the line will wear faster when trimming

against a foundation wall as opposed to trimming

around a tree.

SECTION 6: OPERATING INSTRUCTIONS

Figure 22

Figure 23

Decorative Trimming

Decorative trimming refers to the removal of vegetation

around trees, posts, fences and more.

Rotate the whole unit so that the cutting attachment is at

a 30° angle to the ground. See Figure 24.

Figure 24

Using the Cutting Blade

Before operating the unit with the cutting blade, stand in

the operating position. See Figure 25. Refer to Holding

the Trimmer.

Cutting Blade Operating Tips

To establish a rhythmic cutting procedure:

• Plant feet firmly, comfortably apart.

• Bring the engine to full throttle before entering the

material to be cut. At full throttle the blade has

maximum cutting power and is less likely to bind, stall

or cause blade thrust (which can result in serious

personal injury to the operator or others).

• Cut while swinging the upper part of your body from

left to right.

• Always release the throttle trigger and allow the engine

to return to idle speed when not cutting.

• When you are finished, always unsnap the unit from

the harness before taking off the harness.

• Swing the unit in the opposite direction as the blade

spins, which increases the cutting action.

• After the return swing, move forward to the next area

to be cut plant your feet again.

• The cutting blade is designed with a second cutting

edge. You can use it by removing the blade, turning it

upside down, and reinstalling it.

To reduce the chance of material wrapping around the

blade, follow these steps:

• Cut at full throttle

• Swing the unit into material to be cut from your left to

your right, see Figure 26

• Avoid the material just cut as you make the return swing

WARNING: Do not clear away any cut

material with the engine running or blade

turning. To avoid serious personal injury,

turn off the engine. Allow the blade to stop

before removing materials wrapped around

the blade shaft.

WARNING: Do not sharpen the cutting

blade. Sharpening the blade can cause the

blade tip to break off while in use. This can

result in severe personal injury to yourself

or others. Replace the blade.

WARNING: The blade continues to spin after

the engine is turned off. The coasting blade

can seriously cut you if accidentally touched.

WARNING: Blade thrust may occur when

the spinning blade contacts an object that

it does not immediately cut. Blade thrust

can be violent enough to cause the unit

and/or operator to be propelled in any

direction, and possibly lose control of the

unit. Blade thrust can occur without

warning if the blade snags, stalls or binds.

This is more likely to occur in areas where

it is difficult to see the material being cut.

WARNING: Do not use the cutting blade for

edging or as an edger. Severe personal

injury to yourself or others can result.

WARNING: Always wear eye, hearing, foot, body

protection and the shoulder strap to reduce the

risk of injury when operating this unit.

Figure 26

Figure 25

SECTION 6: OPERATING INSTRUCTIONS

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

WARNING: To prevent serious injury, never

perform maintenance or repairs with unit

running. Always service and repair a cool

unit. Disconnect the spark plug wire to

ensure that the unit cannot start.

Maintenance Schedule

Perform these required maintenance procedures at the

frequency stated in the table. These procedures should

also be a part of any seasonal tune-up.

NOTE: Some maintenance procedures may require

special tools or skills. If you are unsure about

these procedures take your unit to any non-road

engine repair establishment, individual or

authorized service dealer.

NOTE: Maintenance, replacement, or repair of the

emission control devices and system may be

performed by any non-road engine repair

establishment, individual or authorized service

dealer.

In order to assure peak performance of your engine,

inspection of the engine exhaust port may be necessary

after 50 hours of operation. If you notice lost RPM, poor

performance or general lack of acceleration, this service

may be required. If you feel your engine is in need of this

inspection, refer service to any non-road engine repair

establishment, individual or authorized service dealer for

repair. DO NOT attempt to perform this process yourself

as engine damage may result from contaminants

involved in the cleaning process for the port.

FREQUENCY MAINTENANCE REQUIRED REFER TO

Before starting engine Fill fuel tank with fresh fuel Page 11

Every 10 hours Clean and re-oil air filter Page 18

Every 25 hours

Check and clean spark arrestor

Check spark plug condition and gap

Page 19

Page 20

Every 50 hours

Inspect exhaust port and spark arrestor screen for clogging or

obstruction to assure maximum performance levels

Page 19

Line Installation

This section covers both SplitLine™ and standard single

line installation.

Always use Genuine Factory Parts™ 0.095 in. (2.41 mm)

replacement line. Using line other than the specified may

make the engine overheat or fail.

WARNING: Never use metal-reinforced line,

wire, chain or rope. These can break off

and become dangerous projectiles.

There are two methods to replace the trimming line:

• Wind the inner reel with new line

• Install a prewound inner reel

Winding the Existing Inner Reel

1. Hold the outer spool with one hand and unscrew the

bump knob counterclockwise. See Figure 27. Inspect

the bolt inside the bump knob to make sure it moves

freely. Replace the bump knob if damaged.

2. Remove the inner reel from the outer spool. See

Figure 27.

3. Remove spring from the inner reel. See Figure 27.

4. Use a clean cloth to wipe the inner reel, spring, shaft,

and inner surface of the outer spool. See Figure 28.

Figure 27

Figure 28

Inner Reel

Spring

Outer Spool

Bump Knob

Bolt

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

5. Check the indexing teeth on the inner reel and outer

spool for wear. If necessary, remove burrs or replace

the reel and spool. See Figure 29.

NOTE: SplitLine™ can only be used with the inner reel

containing slotted holes. Single line can be used

on either type of inner reel. Use Figure 30 to

identify the inner reel you have.

Indexing Teeth

NOTE: Always use the correct line length when installing

trimming line on the unit. The line may not

release properly if the line is too long.

Single Line Installation

Go To Step 8 for SplitLine™ Installation

6. Cut approximately 25 feet (7.6 m) of new trimming

line, then loop it into two equal lengths. Insert each

end of the line through one of the two holes in the

inner reel. Pull the line through the inner reel so that

the loop is as small as possible. See Figure 31.

Slotted Holes

For Use with SplitLine™

or Single Line

For Use with

Single Line ONLY

7. Wind the lines in tight even layers onto the reel. See

Figure 32. Wind the line in the direction indicated on

the inner reel. Place your index finger between the

two lines to stop the lines from overlapping. Do not

overlap the ends of the line. Proceed to step 11.

SplitLine™ Installation

8. Cut approximately 12 feet (3.65 m) of new trimming

line. Insert one end of the line through one of the two

holes in the inner reel. Pull the line through the inner

reel until only about 4 inches is left out. See Figure 33.

9. Insert the end of the line into the open hole in the

inner reel and pull the line tight to make the loop as

small as possible. See Figure 33.

Loop

10. Before winding, split the line back about 6 inches.

11. Wind the line in tight even layers in the direction

indicated on the inner reel.

NOTE: Failure to wind the line in the direction indicated will

cause the cutting attachment to operate

incorrectly.

12. Insert the ends of the line into the two holding slots.

See Figure 34.

13. Insert the ends of the line through the eyelets in the

outer spool and place inner reel with spring inside

the outer spool. See Figure 35. Push the inner reel

and outer spool together. While holding the inner reel

and outer spool, grasp the ends and pull firmly to

release the line from the holding slots in the reel.

Figure 29

Figure 31

Figure 30

Figure 33

Figure 32

Air Filter Maintenance

Removing the Air Filter/Muffler Cover

WARNING: To avoid serious personal injury,

always turn your trimmer off and allow it to

cool before you clean or service it.

1. Remove the four (4) screws securing the air filter/

muffler cover. See Figure 36. Use a flat blade or T20

Torx bit screwdriver.

2. Pull the cover from the engine. Do not force.

Cleaning the Air Filter

WARNING: To avoid serious personal injury,

always turn your trimmer off and allow it to

cool before you clean it or perform any

maintenance.

Clean and re-oil the air filter every 10 hours of operation.

It is an important item to maintain. Failure to maintain the

air filter will VOID the warranty.

1. Remove air filter/muffler cover. See Removing the Air

Filter/Muffler Cover.

2. Turn cover over and look inside to locate the air filter.

Remove the air filter from inside the air filter/muffler

cover. See Figure 37.

3. Wash the filter in detergent and water. See Figure 38.

Rinse the filter thoroughly. Squeeze out excess

water. Allow it to dry completely.

4. Apply enough clean SAE 30 oil to lightly coat the

filter. See Figure 39.

5. Squeeze the filter to spread and remove excess oil.

See Figure 40.

Figure 36

Screws

EZ-Start™

Lever

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

Holding Slots

Spring

NOTE: The spring must be assembled on the inner reel

before reassembling the cutting attachment.

14. Hold the inner reel in place and install the bump

knob by turning counterclockwise. Tighten securely.

Installing a Pre Wound Reel

1. Hold the outer spool with one hand and unscrew the

bump knob clockwise. See Figure 27. Inspect the

bolt inside the bump knob to make sure it moves

freely. Replace the bump knob if damaged.

2. Remove the old inner reel from the outer spool. See

Figure 27.

3. Remove the spring from the old inner reel. See

Figure 27.

4. Place the spring in the new inner reel.

NOTE: The spring must be assembled on the inner reel

before reassembling the cutting attachment.

5. Insert the ends of the line through the eyelets in the

outer spool. See Figure 35.

6. Place the new inner reel inside the outer spool. Push

the inner reel and outer spool together. While holding

the inner reel and outer spool, grasp the ends and

pull firmly to release the line from the holding slots in

the reel.

7. Hold the inner reel in place and install the bump

knob by turning counterclockwise. Tighten securely.

Replacement Parts

For replacement parts, refer to the Accessories /

Replacement Parts section.

Figure 35

Figure 34

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

Air Filter

Inside Muffler

Cover

Figure 38Figure 37

Figure 40

Figure 39

6. Replace the air filter inside the air filter/muffler cover.

See Figure 37.

NOTE:

Operating the unit without the air filter and air

filter/muffler cover assembly, will VOID the warranty.

Reinstalling the Air Filter/Muffler Cover

1. Place the air filter/muffler cover over the back of the

carburetor and muffler. Align the screw holes.

2. Insert the four (4) screws into the holes in the air

filter/muffler cover and tighten. See Figure 36.

Do not over tighten.

Spark Arrestor Maintenance

1. Remove air filter/muffler cover. See Removing the Air

Filter/Muffler Cover.

2. Locate muffler front and the two (2) bolts securing it

to the engine. See Figure 41. Remove the two (2)

bolts using a flatblade screwdriver or 5/16-inch

socket or nut driver. Pull muffler off of the engine.

3. Turn muffler over to the back side and locate the

exhaust gasket. Remove the muffler gasket from the

muffler. See Figure 41.

NOTE: If the exhaust gasket is torn or damaged, replace

it with a new gasket before reassembling muffler.

Using a small flatblade screwdriver, carefully pry up the

spark arrestor from the recessed hole. See Figure 42.

Remove the spark arrestor from the muffler.

Muffler - Front Side

Muffler - Back Side

Bolts

Exhaust

Gasket

Spark

Arrestor

Muffler - Back Side

Spark

Arrestor

Flat blade

Screwdriver

Spark Arrestor

5. Clean the spark arrestor with a wire brush. Replace it

if it is damaged or if it is impossible to clean

thoroughly. See Figure 42.

6. Reinstall the spark arrestor by pressing it into the

recessed hole on the muffler's back side. Make sure

it fits tightly against the muffler and is not raised up.

7. Place the exhaust gasket against muffler's back side.

Align the gasket bolt holes with the bolt holes in the

muffler. While holding exhaust gasket in place, insert

the bolts into the muffler's front side. See Figure 41.

8. Place the muffler (with the exhaust gasket in place

and bolts inserted), against the engine, aligning the

bolt holes. Tighten the bolts to secure the muffler to

the engine. If using a torque wrench torque to:

80-90 in.•lb. (9-10.2 N•m).

WARNING: If the muffler is not tightened

securely, it could fall off causing damage to

the unit and possible serious personal injury.

9. Reinstall the air filter/muffler cover.

Figure 42

Figure 41

Replacing the Spark Plug

Use a Champion RDJ7Y spark plug (or equivalent). The

correct air gap is 0.020 inch (0.5 mm). Remove the plug

after every 25 hours of operation and check its condition.

1. Stop the engine and allow it to cool. Grasp the plug

wire firmly and pull it from the spark plug.

2. Clean around the spark plug. Remove the spark plug

from the cylinder head by turning a 5/8 in. socket

counterclockwise.

3. Replace cracked, fouled or dirty spark plug. Set the

air gap at 0.020 in. (0.5 mm) using a feeler gauge.

See Figure 44.

CAUTION: Do not sand blast, scrape or

clean electrodes. Grit in the engine could

damage the cylinder.

4. Install a correctly-gapped spark plug in the cylinder

head. Tighten by turning the 5/8 inch socket

clockwise until snug.

If using a torque wrench torque to:

110-120 in.•lb. (12.3-13.5 N•m).

Do not over tighten.

0.020 in.

(0.5 mm)

Figure 44

Idle Speed Screw

Figure 43

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

Carburetor Adjustment

The idle speed of the engine is adjustable through the air

filter/muffler cover. See Figure 43.

NOTE: Careless adjustments can seriously damage your

unit. An authorized service dealer should make

carburetor adjustments.

Check Fuel Mixture

Old and/or improperly mixed fuel is usually the reason for

improper unit performance. Drain and refill the tank with

fresh, properly mixed fuel prior to making any

adjustments. Refer to Oil and Fuel Information.

Clean Air Filter

The condition of the air filter is important to the operation

of the unit. A dirty air filter will restrict air flow and change

the air/fuel mixture. This is often mistaken for an out of

adjustment carburetor. Check the condition of the air

filter before adjusting the idle speed screw. Refer to Air

Filter Maintenance.

Adjust Idle Speed

WARNING: The cutting attachment may

spin during idle speed adjustments. Wear

protective clothing and observe all safety

instructions to prevent serious personal

injury.

If, after checking the fuel mixture and cleaning the air

filter, the engine still will not idle, adjust the idle speed as

follows.

1. Start the engine and let it run at a high idle for a

minute to warm up. See Starting/Stopping

Instructions.

2. Release the throttle trigger and let the engine idle. If

the engine stops, insert a small Phillips or flat blade

screwdriver into the hole in the air filter/muffler cover.

See Figure 43. Turn the idle speed screw in,

clockwise, 1/8 of a turn at a time (as needed) until the

engine idles smoothly.

NOTE: The cutting attachment should not rotate when

the engine idles.

3. If the cutting attachment rotates when the engine idles,

turn the idle speed screw counterclockwise 1/8 of a

turn at a time (as needed), to reduce idle speed.

Checking the fuel mixture, cleaning the air filter, and

adjusting the idle speed should solve most engine

problems.

If this is not the case and the following are all true:

• The engine will not idle

• The engine hesitates or stalls on acceleration

• There is a loss of engine power

Have the carburetor adjusted by an authorized service

dealer.

WARNING: After turning the unit off, make

sure the cutting attachment has stopped

before setting the unit down. This helps

prevent serious personal injury.

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MTD 41ADY90C401 Le manuel du propriétaire

Marque: MTD

Modèle: 41ADY90C401

Catégorie: Coupe-herbe

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