Operator’s Manual
Curved Shaft,
2-Cycle Trimmer
Model
41AD-280G000
IMPORTANT: Read safety rules and instructions carefully before operating equipment.
Warning: This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-
covered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a spark arrester meeting
applicable local or state laws (if any). If a spark arrester is used, it should be maintained in effective working order by the operator.
In the State of California the above is required by law (Section 4442 of the California Public Resources Code). Other states may have
similar laws. Federal laws apply on federal lands. A spark arrestor is installed on this unit. A replacement spark arrestor for the muffler
is available through your nearest engine authorized service dealer or contact the service department, 550 N. 54th Street, Chandler,
Arizona 85226-2434.
MTD SOUTHWEST INC 550 N. 54TH STREET, CHANDLER, ARIZONA 85226-2434
PRINTED IN U.S.A. FORM NO. 770-10506
PART NO. 10316 rev. A (12/00)
English
2
TABLE OF CONTENTS
Content Page
Important Safe Operation Practices .................................................................... 3-5
Assembling Your Trimmer .................................................................................... 6
Know Your Trimmer.............................................................................................. 7
Operating Your Trimmer ....................................................................................... 8
Making Adjustments ............................................................................................ 12
Maintaining Your Trimmer .................................................................................... 13
Off-Season Storage ............................................................................................. 16
Troubleshooting.................................................................................................... 17
Parts List .............................................................................................................. 18
Warranty............................................................................................................... 22
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 to 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.
• You can locate the model number by looking on the bottom side of the shaft housing next to the
shaft grip. A sample model plate is explained below. For future reference, please copy the model
number and the serial number of the equipment in the space below.
CALLING CUSTOMER SUPPORT
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 in Canada 1- (800)-668-1238, to reach a Customer Support
representative. Please have your unit’s model number and serial number ready when you
call. See previous section to locate this information. You will be asked to enter the serial
number in order to process your call.
Copy the model / parent
part number here:
Copy the serial number here:
3
SECTION 1: IMPORTANT SAFE OPERATION PRACTICES
This Symbol Points Out Important Safety Information Which, If Not Followed, Could Endanger The
Personal Safety And/or Property Of Yourself And Others. Read And Follow All Instructions In This
Manual Before Attempting To Operate Your Trimmer. Failure To Comply With These Instructions May
Result In Personal Injury. When You See This Symbol–Heed Its Warning.
DANGER: Your unit was built to be operated according to the rules for safe operation in this
manual. As with any type of power equipment, carelessness or error on the part of the operator can
result in serious personal injury. This trimmer is capable of amputating hands and feet. Failure to
observe the following instructions could result in serious injury or death.
WARNING: Engine Exhaust, some of its constituents, and certain vehicle components contain or emit
chemicals known to State of California to cause cancer and birth defects or other reproductive harm.
READ ALL INSTRUCTIONS
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.
• Children and teens under the age of 15 must not
use the unit, except for teens guided by an adult.
• 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 the cutting attachment shield is
properly attached, and positioned as recommended. Failure to so can result in personal injury
to the operator and bystanders, as well as damage to the unit.
• Use only 0.080 inch (2.03 mm) diameter genuine
manufacturer’s replacement line. Never use
metal-reinforced line, wire, chain, or rope, etc.
These can break off and become a dangerous
projectile.
• Be aware of the risk of injury to the head, hands
and feet.
• Clear the area to be cut before each use. Remove
all objects such as rocks, broken glass, nails,
wire, or string which can be thrown or become
entangled in the cutting attachment. Clear the
area of children, bystanders, and pets. At a minimum, keep all children, bystanders and pets outside a 50 feet (15 m) radius; there still may be a
risk to bystanders from thrown objects.
Bystanders should wear eye protection. If you are
approached, stop the engine and cutting attachment immediately.
• Squeeze the throttle control and check that it
returns automatically to the idle position. Make all
adjustments or repairs before using unit.
• This unit was not designed to be used as a
brushcutter. Do not attach or operate this unit
with any type of brushcutting blade or brushcutting attachment.
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 cap of the
fuel tank, 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 area outdoors
where there are no sparks or flames. Slowly
remove the fuel cap only after stopping engine.
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 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 kill.
Operate this unit only in a well ventilated area
outdoors.
• Wear safety glasses or goggles that are marked
as meeting ANSI Z87.1 standards, and 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.
4
• This unit does not have a clutch. The cutting
attachment continues to rotate when the engine
is idling. To prevent injury, have the unit adjusted
by an authorized service technician.
• Adjust the D-Handle to your size 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. Be in the starting position whenever pulling the starter rope. The operator and unit must be in a stable position while
starting. See Starting/Stopping Instructions.
• Use the right tool. Only use this tool for the purpose intended.
• Do not overreach. Always keep proper footing
and balance.
• Always hold the unit with both hands when operating. Keep a firm grip on both the front and rear
handle 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 is rotating.
• Do not touch the engine, gear housing or muffler.
These parts get extremely hot from operation.
When turned off they remain hot for a short time.
• 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 and switch the engine to off for maintenance, repair, or for changing the cutting attachment or other attachments.
• Use only replacement parts and accessories
approved by the manufacturer for this unit. These
are available from your authorized service dealer.
Use of any non approved parts or accessories
could lead to serious injury to the user, or damage
to the unit, and void your warranty.
• Keep unit clean of vegetation and other materials.
They may become lodged between the cutting
attachment and shield.
• To reduce fire hazard, replace faulty muffler and
spark arrestor, keep the engine and muffler free
from grass, leaves, excessive grease or carbon
build up.
OTHER SAFETY WARNINGS
• Never store the unit, with fuel in the tank, 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
WARNING – YOUR RESPONSIBILITY: Restrict the use of this power machine to persons
who read, understand and follow the warnings and instructions in this manual and on the machine.
• 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
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.
• KEEP BYSTANDERS AWAY
Keep all bystanders, especially children and pets, at least 50 feet (15 m) from the operating area.
5
• PRIMER BULB
Push primer bulb, fully and slowly, 5 to 7 times.
• UNLEADED FUEL
Always use clean, fresh unleaded fuel.
• OIL
Refer to operator's manual for the proper type of oil.
• THROWN OBJECTS CAN CAUSE SEVERE INJURY
Do not operate unit without proper attachments and guards in place.
• ON/OFF STOP CONTROL
ON / START / RUN
• ON/OFF STOP CONTROL
OFF OR STOP
• HOT SURFACE WARNING
Do not touch a hot muffler, cylinder or gearbox. You may get burned. These parts get
extremely hot from operation. When turned off they remain hot for a short time.
• SHARP BLADE
WARNING: Sharp blade on cutting attachment shield. To prevent serious injury, do not
touch line cutting blade.
• DO NOT USE BLADES
WARNING: To prevent serious injury, do not attach or operate the unit with any type of
blade.
• CHOKE CONTROL
A • FULL choke position.
B • PARTIAL choke position.
C • RUN position.
WARNING: The operation of any power tool can cause foreign objects to be thrown into
your eyes. This can lead to severe eye damage. Before commencing power tool operation,
always wear safety glasses or goggles that are marked as meeting ANSI Z87.1 standards,
and a full face shield when needed.
6
Figure 4
Installing and Adjusting the D-Handle
NOTE: The bolt, washer and wing nut need to be
removed from the D-handle before installing.
1. Push the D-handle down onto the shaft housing
so that the handle slants towards the shaft grip.
The squared bolt hole in the handle is to the right.
See Figure 1.
2. Insert the shoulder bolt into the squared hole in
the handle. Place the washer on the bolt, and
screw the wing nut onto the bolt. Do not tighten
until you make the handle adjustment.
3. Rotate the D-handle to place the grip above the
top of the shaft housing. Place it a minimum of 6
inches (15.24 cm) from the end of the shaft grip.
4. While holding the unit in the operating position,
position the D-handle to the location that provides
you the best grip. See Figure 2.
5. Tighten the wing nut until the D-handle is secure.
SECTION 2: ASSEMBLING YOUR TRIMMER
Installing the Cutting Attachment Shield
Use the following instructions if the cutting attachment shield on your unit is not installed.
WARNING: Never operate the trimmer
without the cutting attachment shield in
place to prevent serious personal injury.
1. Place the cutting attachment shield onto the shaft
housing above the clamp assembly, See Figure 3.
2. Push the cutting attachment shield down to the
top of the cutting attachment assembly and then
rotate the cutting attachment shield until the
screw holes align and the guard fits into the
recessed pocket. See Figure 3.
3. Install the four (4) screws with a Phillips screwdriver. Tighten securely. See Figure 4.
Figure 1
Figure 2
Figure 3
Bolt
Washer
Wing Nut
Tighten
Shaft Grip
D-Handle
Minimum 6 inches
(15.24 cm)
Shaft Housing
Cutting
Attachment
Shield
Cutting
Attachment
(4) Screws
Shaft Housing
Clamp
7
Figure 5
SECTION 3: KNOW YOUR TRIMMER
Primer Bulb
Choke Control
Air Filter/
Muffler Cover
Spark
Plug
Muffler
On/Off Stop
Control
STOP/OFF (O)
START/ON (I)
Throttle
Control
Read this operator’s manual and safety rules before
operating your trimmer. Compare illustrations in
Figure 5 with your trimmer to familiarize yourself with
the location of various controls and adjustments.
Save this manual for future reference.
Application
Use this unit for cutting grass and light weeds. Also
for edging and decorative trimming around trees,
fences, etc.
Throttle Control
The throttle control trigger is located below shaft grip.
It controls the engine speed. See Figure 5.
On/Off Stop Control
The On/Off Stop control switch is located on the left
side mounting bracket. It is used to turn the unit on
and off. The switch must be in the START position to
start the unit. See Figure 5.
Choke Control
The choke control is located above the air filter/muffler
cover. It is used to enrich the fuel mixture when starting
a cold engine. See Figure 5.
Primer Bulb
The primer bulb is located to the left of the air
filter/muffler cover. It is used to draw fuel into the
carburetor when starting a cold engine or after
refueling the unit. See Figure 5.
Shaft Grip and D-Handle
Used to grip the unit during operation. See Figure 5.
Cutting Attachment Shield
Protects operator from thrown debris. Contains line
cut-off blade to make sure the line is not extended
beyond its proper length. Cutting attachment shield
must be installed at all times when using the cutting
attachment. See Figure 5.
Cutting Attachment
Consists of a reel housing, reel, spring, Bump Knob,
and cutting line. See Figure 5.
Cutting Attachment
Shield
Fuel Cap
D-Handle
Cutting Attachment
Shaft Grip
Shaft
Housing
Line Cutting Blade
8
SECTION 4: OPERATING YOUR TRIMMER
Oil and Gas Mixing Instructions
Old and/or improperly mixed fuel are the main
reasons for the unit not running properly. 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 alcoholblended 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.
• Use the fuel additive STA-BIL® or an equivalent.
• 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 use of fuel additive, such as STA-BIL® Gas
Stabilizer or an equivalent, will inhibit corrosion and
minimize the formation of gum deposits. Using a fuel
additive can keep fuel from forming harmful deposits
in the carburetor for up to six (6) months. 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
32:1 fuel/oil ratio. Do not mix them directly in the
engine fuel tank. See Figure 6 for specific gas and oil
mixing ratios.
NOTE: Two gallons (7.6 liters) of unleaded gasoline
mixed with one 8 oz. (236 ml) bottle of Arnold 2 Cycle
Oil makes a 32:1 fuel/oil ratio OR one gallon (3.8 liters)
of unleaded gasoline mixed with one 4 oz. (120 ml)
bottle of Arnold 2 Cycle Oil makes a 32:1 fuel/oil ratio.
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 area outdoors. Wipe up any
spilled fuel immediately. Avoid creating
a source of ignition for spilt 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.
+
OR
UNLEADED GAS ARNOLD 2 CYCLE OIL
2 US. GALLONS + 8.0 FL. OZ.
(7.6 LITERS) (236 ml)
1 US. GALLON
+ 4.0 FL. OZ.
(3.8 LITERS) (120 ml)
MIXING RATIO - 32:1
Figure 6
9
Choke Control
Full Choke
Position (A)
Primer Bulb
Starting Engine
WARNING: Avoid accidental starting. Be
in the starting position when pulling the
starter rope. See Figure 9. The operator
and unit must be in a stable position
while starting to avoid serious personal
injury.
WARNING: Operate this unit only in a
well ventilated area outdoors. Carbon
monoxide exhaust fumes can be lethal
in a confined area.
1. Mix gas with oil. Fill fuel tank with fuel/oil mixture.
See Oil and Gas Mixing Instructions.
2. Put the On/Off Stop Control in the START (I)
position. See Figure 7.
3. Fully press and release primer bulb slowly 5 to 7
times. Fuel should be visible in the bulb. If fuel is
not visible, press three (3) more times, or until it
is. See Figure 8.
4. Place the choke lever in the FULL choke position
(A ). See Figure 8.
5. With the unit on the ground, squeeze the throttle
control and pull starter rope briskly. See Figure 9.
Continue pulling until the engine sounds as
though it wants to run (normally 2 to 5 pulls).
NOTE: Squeeze the throttle control until the engine
has started and warmed up.
6. Place the choke lever in the PARTIAL choke
position (B ). See Figure 8.
NOTE: The unit will not run in the FULL choke
position (A ).
7. Pull starter rope briskly 1 to 3 times to start the
engine. See Figure 9.
8. If the engine does not start, repeat steps
4 through 7.
Run
Position (C)
Partial Position (B)
NOTE: If the engine floods while trying to start, place
the choke lever in the RUN position (C ). Squeeze
the throttle control. Pull the starter rope briskly. The
engine should start within three (3) to eight (8) pulls.
9. Squeeze the throttle control to warm up engine
for 5 to 10 seconds. Place the choke lever in the
RUN position (C ). See Figure 8.
NOTE: Choking is unnecessary when starting a warm
engine. Put the On/Off Stop Control in the START (I)
position and start in PARTIAL Choke
position (B ). See Figures 7 and 8.
To Stop Engine
1. Release your hand from the throttle control. See
Figure 9. Allow the engine to cool down by idling.
2. Put the On/Off Stop Control in the STOP (O)
position. See Figure 8.
Figure 7
Figure 8
Figure 9
On/Off Stop Control
Start/On (I)
Stop/Off (O)
Starter Rope
Throttle Control
Each time the head is bumped, about 1 inch (25.4
mm) of trimming line is released. A blade in the cutting attachment shield will cut the line to the proper
length if excess line is released.
For best results, tap the Bump Head™ on bare
ground or hard soil. If line release is attempted in tall
grass, the engine may stall. Always keep the trimming
line fully extended. Line release becomes more difficult as the cutting line becomes shorter.
NOTE: Do not rest the Bump Head™ on the ground
while the unit is running .
CAUTION: Do not remove or alter the
line cutting blade assembly. Excessive
line length will make the unit overheat.
This may lead to serious personal injury
or damage to the unit.
Some line breakage will occur from:
• Entanglement with foreign matter
• Normal line fatigue
• Attempting to cut thick, stalky weeds
• Forcing the line into objects such as walls or
fence posts
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 11.
NOTE: Always keep the trimming line fully extended.
Line release becomes more difficult as cutting line
becomes shorter
10
Figure 10
Using Your Trimmer
WARNING: Dress properly to reduce the
risk of injury when operating this unit.
Do not wear loose clothing or jewelry.
Wear eye and ear/hearing protection.
Wear heavy, long pants, boots and
gloves. Do not wear short pants, sandals
or go barefoot.
Before operating the unit, stand in the operating
position. See Figure 10. Check for the following:
• The operator is wearing eye protection and proper clothing.
• The right arm is slightly bent, and the hand is
holding the shaft grip.
• The left arm is straight, and the hand is holding
the D-Handle.
• The unit is at waist level.
• The cutting attachment is parallel to the ground
and easily contacts the vegetation to be cut without the operator having to bend over.
Figure 11
11
Figure 12
Decorative Trimming
Decorative trimming is accomplished by removing all
vegetation around trees, posts, fences, etc.
Rotate the whole unit so that the cutting attachment
is at a 30° angle to the ground. See Figure 12.
Tips for Best Trimming Results
• 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) 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-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 previous trimming techniques
• What vegetation is being cut
• Where it’s being cut
For example, the line will wear faster when trimming
against a foundation wall as opposed to trimming
around a tree.
12
SECTION 5: MAKING ADJUSTMENTS
Idle Speed Screw
Figure 13
Engine Specifications
Engine Type … … … … … … …Air-Cooled, 2-Cycle
Displacement … … … … … … … … … … … 31cc
Idle Speed R.P.M. … … … … …
3,400-4,400 rpm
Operating R.P.M. … … … … … … 6,600-8,000 rpm
Fuel/Oil Mixture Ratio. … … … … … … … … 32:1
Unit Weight
(No fuel, with cutting attachment, cutting
attachment shield and D-handle) … 9.5 lbs. (4.31 kg)
Carburetor Adjustments
WARNING: If any adjustments are made
to the engine while the engine is running
(e.g. carburetor), keep clear of all moving
parts. Be careful of heated surfaces and
muffler.
The idle speed adjuster of the engine is adjustable
through the air filter/muffler cover. See Figure 13.
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 the unit not running properly. Drain and refill the
tank with fresh, properly mixed fuel prior to making
any adjustments. Refer to OPERATING YOUR TRIMMER in Section 4.
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 adjuster. Refer to MAINTAINING YOUR
TRIMMER in Section 6.
Adjusting Idle Speed
WARNING: This unit will need to be
running during idle speed adjustment.
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 screw as follows.
1. Start the engine and let it run about 2-3 minutes
at a high idle to warm up. Refer to OPERATING
YOUR TRIMMER in Section 4.
2. Release the throttle control 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. Turn the idle speed screw in,
clockwise, 1/8 of a turn at a time (as needed) until
the engine idles smoothly. See Figure 13.
3. If the unit appears to be idling too fast, turn the
idle speed adjuster counterclockwise 1/8 of a turn
at a time (as needed), to reduce idle speed.
NOTE: If a tachometer is available, set idle speed to
RPM specifications.
Checking the fuel mixture, cleaning the air filter, and
adjusting the idle speed screw should solve most
engine problems.
If not and:
• 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:
When the unit is turned off
make sure the cutting attachment has
stopped before the unit is set down to
prevent serious personal injury.
13
WARNING: To avoid serious personal
injury, always turn the unit off, allow it
to cool and disconnect the spark plug
before you clean or perform any
maintenance on it.
Trouble Shooting
Refer to the trouble shooting chart for more information.
Engine
IMPORTANT: Never run your engine without air
cleaner completely assembled.
Air Filter Maintenance
1. Place the choke control in the PARTIAL choke
position (B).
NOTE: The choke control must be in the PARTIAL
choke position (B) to remove the air filter/muffler
cover. See Figure 14.
2. Remove the four (4) screws securing the air
filter/muffler cover. See Figure 14. Use a flat blade
or # T20 Torx bit screwdriver.
3. Pull the cover from the engine. Do not force.
4. Remove the air filter from behind the air filter/
muffler cover. See Figure 15.
4. Wash the filter in detergent and water. Rinse the
filter thoroughly. Squeeze out excess water. Allow
it to dry completely.
5. Apply enough clean SAE 30 oil to lightly coat the
filter. See Figure 16.
6. Squeeze the filter to spread and remove excess
oil. See Figure 16.
7. Replace the air filter inside the air filter/muffler
cover. See Figure 15.
NOTE: Operating the unit without the air filter and air
filter/muffler cover assembly, will VOID the warranty.
Figure 14
Figure 15
SECTION 6: MAINTAINING YOUR TRIMMER
Maintenance Schedule
These required maintenance procedures should be performed at the frequency stated in the table. They should
also be included as part of any seasonal tune-up.
FREQUENCY MAINTENANCE REQUIRED
Before Starting Engine Fill fuel tank with correct oil and fuel mixture.
Every 10 Hours Clean and re-oil air filter.
Every 50 Hours or Seasonal Check spark plug condition and gap.
Choke Control
Screws
Screws
Partial Choke
Position (B)
Air Filter
Figure 16
14
8. Place the air filter/muffler cover over the back of
the carburetor and muffler.
NOTE: The choke control must be in the PARTIAL
choke position (B) to install the air filter/muffler cover.
See Figure 14.
9. Insert the four (4) screws into the holes in the air
filter/muffler cover and tighten. See Figure 14.
Use a flat blade or # T20 Torx bit screwdriver. Do
not over tighten. Do not force.
Figure 17
Figure 18
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 50 hours of operation to check its
condition.
1. Stop the engine and allow it to cool. Grasp the
plug wire firmly and pull the cap from the spark
plug.
2. Clean dirt from around the spark plug. Remove
the spark plug from the cylinder head by turning a
5/8 in. socket counterclockwise.
NOTE: Replace cracked, fouled or dirty spark plug.
3. Set the air gap at 0.020 inch (0.5 mm) using a
feeler gauge. See Figure 17.
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 inch
(0.5 mm)
Line Installation
This section covers both SplitLine™ and standard
single line installation.
Always use manufacturer’s 0.080 inch (2.03 mm)
replacement line. Line other than specified may make
the engine overheat or fail.
WARNING: Never use metal-reinforced
line, wire, chain, or rope, etc. These can
break off and become a dangerous projectile.
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. Inspect the
bolt inside the Bump Knob to make sure it moves
freely. Replace the Bump Knob if damaged. See
Figure 18.
2. Remove the inner reel from the outer spool. See
Figure 19.
3. Remove spring from the inner reel. See Figure 19.
4. Use a clean cloth to clean the the inner reel,
spring, shaft, and inner surface of the outer spool.
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 20.
NOTE: SplitLine™ can only be used with the inner
reel with the slotted holes. Single line can be used on
either type of inner reel. Use figure 21 to identify the
inner reel you have.
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.
Bump Knob
Bolt
15
Figure 19
Figure 22
Figure 23
Figure 24
Figure 20
Figure 21
Single Line Installation
Go To Step 8 for SplitLine™ Installation
6. Take approximately 25 feet (7.6 m) of new trimming line, 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 22.
7. Wind the lines in tight even layers, onto the reel.
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. See Figure 23.
Proceed to step 11.
SplitLine™ Installation
8. Take 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 24.
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 24.
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.
Inner Reel
Spring
Outer Spool
Indexing Teeth
Slotted Holes
For Use with SplitLine or
Single Line
For Use with
Single Line ONLY
Loop
Loop
16
SECTION 7: OFF SEASON STORAGE
If the unit will be stored for an extended time,
1. Drain all fuel from the fuel tank into a container.
Do not use fuel that has been stored for more
than 60 days. Dispose of the old fuel in
accordance to local regulations.
2. Start the engine and allow it to run until it stalls.
This ensures that all fuel has been drained from
the carburetor.
3. Allow the engine to cool. Remove the spark plug
and put 1 oz. (30 ml) of high quality motor oil
into the cylinder. Pull the starter rope slowly to
distribute the oil. Reinstall the spark plug.
NOTE: Remove the spark plug and drain all of the oil
from the cylinder before attempting to start the unit
after storage.
4. Thoroughly clean the unit and inspect for any
loose or damaged parts. Repair or replace
damaged parts and tighten loose screws, nuts or
bolts.
The unit is ready for storage.
• Never store the unit with fuel in the tank where
fumes may reach an open flame or spark.
• Allow the engine to cool before storing.
• Store the unit in a locked up area to prevent
unauthorized use or damage.
• Store the unit in a dry, well ventilated area. Do not
store next to corrosive materials, such a fertilizer.
• Store the unit out of the reach of children.
12. Insert the ends of the line into the two holding
slots. See Figure 25.
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 26. 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 spool.
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 clockwise. Tighten securely.
Installing a Prewound Reel
1. Hold the outer spool with one hand and unscrew
the Bump Knob counterclockwise. Inspect the
bolt inside the Bump Knob to make sure it moves
freely. Replace the Bump Knob if damaged. See
Figure 18.
2. Remove the old inner reel from the outer spool.
See Figure 19.
3. Remove the spring from the old inner reel. See
Figure 19.
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 26.
Holding Slots
Spring
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 spool.
7. Hold the inner reel in place and install the Bump
Knob by turning clockwise. Tighten securely.
Replacement Parts:
Refer to PARTS LIST in Section 9.
Figure 25
Figure 26
17
SECTION 8: TROUBLE SHOOTING GUIDE
ENGINE WILL NOT START
ENGINE WILL NOT IDLE
ENGINE WILL NOT
ACCELERATE
ENGINE LACKS POWER
OR STALLS WHEN UNDER
LOAD
CUTTING ATTACHMENT
WILL NOT ADVANCE LINE
On/Off Stop Control in the STOP
position
Empty fuel tank
Primer bulb wasn't pressed enough
Engine flooded
Old or improperly mixed fuel
Fouled spark plug
Air Filter is Plugged
Old or improperly mixed fuel
Improper carburetor adjustment
Old or improperly mixed fuel
Improper carburetor adjustment
Old or improperly mixed fuel
Improper carburetor adjustment
Cutting attachment bound with
grass
Cutting attachment out of line
Inner reel bound up
Cutting head dirty
Line welded
Line twisted when refilled
Not enough line is exposed
Turn the On/Off Stop Control to START
Fill fuel tank
Press primer bulb fully and slowly 5-7
times
Use starting procedure with choke
control in the RUN position
Drain fuel tank / Add fresh fuel mixture
Replace or clean the spark plug
Replace or clean the air filter
Drain fuel tank / Add fresh fuel mixture
Refer to MAKING ADJUSTMENTS,
Section 5.
Drain fuel tank / Add fresh fuel mixture
Refer to MAKING ADJUSTMENTS,
Section 5.
Drain fuel tank / Add fresh fuel mixture
Refer to MAKING ADJUSTMENTS,
Section 5.
Stop the engine and clean cutting
attachment
Refill with new line
Replace the inner reel
Clean inner reel and outer spool
Disassemble, remove the welded section and rewind the line
Disassemble and rewind the line
Push the Bump Knob and pull out line
until 4 inches (102 mm) of line is outside of the cutting attachment
Trouble Possible Cause(s) Corrective Action
18
SECTION 9: PARTS LIST FOR MODEL 41AD-280G000
42
1
2
3
8
10
12
3
4
5
7
6
11
13
15
16
47
48
43
14
22
49
20
17
18
19
21
26
27
28
31
32
30
33
34
36
37
38
35
25
32
39
40
46
41
44
42
45
24
29
23
9
19
1 182059 Air Cleaner/Muffler Cover Assembly
(includes 2 & 42)
2 180350 Air Cleaner Filter
3 181345 Carburetor Mounting Screw
Assembly
4 180226 Wavey Washer
5 182160 Choke Lever Assembly (includes 6)
6 182161 Choke Knob and Screw
7 182162 Choke Lever and Plate (includes 5)
8 182062 Carburetor Assembly W/Limiter
Caps (includes 9 & 21)
9 610675 Carburetor Gasket
10 181860 Carb Mount Screw
11 182616 Primer and Hose Assembly
12 182063 Carb Mount Assembly
(includes 10 & 15)
13 684451 Reed Assembly
14 181866 Power Shaft Assembly
15 612115 Carburetor Mount Gasket
16 181865 Crank Case Service Assembly
(includes 10, 14 & 24)
17 612134 Rear Mounting Pad
18 181152 Fuel Tank Assembly
(includes 19-21)
19 180000 Fuel Cap Assembly
20 181168 Fuel Return Line
21 682039 Fuel Line Assembly
22 145308 Front Mounting Pad
23 153520 Shroud Assembly
24 181861 Shroud Screw
25 182064 Shroud Extension and Stand
26 181867 Flywheel Assembly
27 610303 Square Nut Drive
28 181597 Recoil Pulley Assembly
29 613102 Recoil Spring
30 611061 Rope Guide
31 181889 Pulley Retainer Assembly
32 182827 Switch Assembly (includes 39)
33 181079 Pull Handle
34 613103 Rope
35 182828 Starter Housing Assembly
(includes 28-34 & 39)
36 181862 Housing Screw
37 181345 Cover Screw
38 153597 Upper Clamp Assembly
39 180036 Wire Lead
40 181937 Module Assembly
41 610311 Spark Plug
42 182066 Muffler Assembly (includes 43-45)
43 182747 Spark Arrestor
44 182065 Exhaust Gasket
45 147575 Muffler Mounting Bolt Assembly
46 181622 Cylinder Assembly
(includes 48 & 49)
47 684449 Piston and Rod Assembly
48 610674 Cylinder Gasket
49 182505 Cylinder Bolt
* 182067 Engine Gasket Kit
* 180602 O.E.M. Carburetor Repair Kit
(Walbro)
* 180090 O.E.M. Carburetor Repair Kit (Zama)
* 181069 Gasket Diaphragm Repair Kit
(Walbro)
* 180091 Gasket Diaphragm Repair Kit
(Zama)
* 180530 Piston Ring
* 182792 Short Block Assembly
(includes 10, 14, 16, 24, 41, 46-49)
* 181501 Starter Housing Screw Set
* 610309 Crankcase Seal
* Not Shown
Part No. Part Description
Ref.
No.
Part No. Part Description
Ref.
No.
MODEL 41AD-280G000
20
MODEL 41AD-280G000
10
8
13
9
17
16
18
19
15
11
12
14
1
1
5
6
7
4
3
2
21
1 182093 Throttle Housing and Trigger
Assembly (includes 2 & 3)
2 610314 Throttle Trigger Spring
3 180975 Throttle Trigger
4 182068 Throttle Cable Assembly
5 145819 D-Handle Assembly
6 181587 D-Handle Hardware
7 181893 Drive Shaft Housing Assembly
8 153597 Lower Clamp Assembly
9 682064 Flexible Drive Shaft
10 180531 Shield Mounting Screw
11 181784 Bushing Housing Assembly with
Spool Shaft
12 145569 Anti-Rotation Screw
13 683274 Shield and Blade Assembly
(includes 14)
14 682061 Blade Assembly
15 153619 Outer Spool and Eyelet Assembly
(includes 16)
16 610660 Retainer
17 610317 Spring
18 610318 Inner Reel
19 153066 Bump Head Knob Assembly
* 610375 Replacement Line, 0.80 Diameter
* 153577 Reel and Line Assembly
* 180897 Bump Head Assembly
(includes 15-19)
* 682075 Shoulder Strap Assembly
* 182780 Arnold 2-Cycle Oil
* not shown
MODEL 41AD-280G000
Part No. Part Description
Ref.
No.
Part No. Part Description
Ref.
No.
Optional Accessories
MANUFACTURER’S LIMITED WARRANTY FOR:
No implied warranty, including any implied warranty of
merchantability or fitness for a particular purpose,
applies after the applicable period of express written
warranty above as to the parts as identified. No other
express warranty or guaranty, whether written or oral,
except as mentioned above, given by any person or
entity, including a dealer or retailer, with respect to
any product shall bind MTD. During the period of the
Warranty, the exclusive remedy is repair or replacement of the product as set forth above. (Some states
do not allow limitations on how long an implied warranty
lasts, so the above limitation may not apply to you.)
The provisions as set forth in this Warranty provide
the sole and exclusive remedy arising from the sales.
MTD shall not be liable for incidental or consequential
loss or damages including, without limitation, expenses incurred for substitute or replacement lawn care
services, for transportation or for related expenses, or
for rental expenses to temporarily replace a warranted product. (Some states do not allow limitations on how
long an implied warranty lasts, so the above limitation
may not apply to you.)
In no event shall recovery of any kind be greater than the
amount of the purchase price of the product sold.
Alteration of the safety features of the product shall void
this Warranty. You assume the risk and liability for loss,
damage, or injury to you and your property and/or to
others and their property arising out of the use or misuse
or inability to use the product.
This limited warranty shall not extend to anyone other
than the original purchaser, original lessee or the person
for whom it was purchased as a gift.
How State Law Relates to this Warranty: This warranty
gives you specific legal rights, and you may also have
other rights which vary from state to state.
To locate your nearest service dealer dial
1-800-345-8746 in the United States or
1-800-668-1238 in Canada.
MTD Southwest Inc
550 N. 54th Street
Chandler, AZ 85226 U.S.A.
The limited warranty set forth below is given by MTD
SOUTHWEST INC (“MTD”) with respect with new
merchandise purchased and used in the United States, its
possessions and territories.
MTD warrants this product against defects in material and
workmanship for a period of two (2) years commencing on
the date of original purchase and will, at its option, repair or
replace, free of charge, any part found to be defective in
material or workmanship. This limited warranty shall only
apply if this product has been operated and maintained in
accordance with the Operator’s Manual furnished with the
product, and has not been subject to misuse, abuse,
commercial use, neglect, accident, improper maintenance,
alteration, vandalism, theft, fire, water or damage because
of other peril or natural disaster. Damage resulting from the
installation or use of any accessory or attachment not
approved by MTD for use with the product(s) covered by
this manual will void your warranty as to any resulting damage. This warranty is limited to ninety (90) days from the
date of original retail purchase for any MTD product that is
used for rental or commercial purposes, or any other
income-producing purpose.
HOW TO OBTAIN SERVICE: Warranty service is available,
WITH PROOF OF PURCHASE THROUGH YOUR LOCAL
AUTHORIZED SERVICE DEALER. To locate the dealer in
your area, please check for a listing in the Yellow Pages or
contact the Customer Service Department of MTD SOUTHWEST INC by calling 1-800-345-8746 or writing to 550 N.
54th Street, Chandler, Arizona 85226 or if in Canada call
1-800-668-1238. No product returned directly to the factory will be accepted unless prior written permission has been
extended by the Customer Service Department of MTD
SOUTHWEST INC.
This limited warranty does not provide coverage in the
following cases:
A. Tune-ups - Spark Plugs, Carburetor Adjustments,
Filters.
B. Wear items - Bump Knobs, Outer Spools,Cutting
Line, Inner Reels, Starter Pulley,Starter Ropes, Drive
Belts.
C. MTD does not extend any warranty for products sold
or exported outside of the United States of America,
its possessions and territories, except those sold
through MTD’s authorized channels of export distribution.
MTD reserves the right to change or improve the design
of any MTD Product without assuming any obligation to
modify any product previously manufactured.
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