MTD 41ADY90C401 Le manuel du propriétaire

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Le manuel du propriétaire

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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
2
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
T
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 :
3
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.
W
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.
4
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.
5
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
6
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
7
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.
8
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
9
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
10
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
5.
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
11
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
12
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.
IF
...
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
13
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.
14
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
r
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
15
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
16
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
17
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
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
18
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
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
19
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.
4.
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
20
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

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