Craftsman 316791890 Owner’s Manual
Operator's Manual
®
2-Cycle
WEEDWACKER® GAS TRIMMER
Model No. 316.791890
UNBE_V4F_Z_ ,_r/4Rll_e _ A _ t _
with MAX FIRE@iI3NITION '_
CAUTION: Before using
this product, read this
manual and follow all
safety rules and operating
instructions.
Sears, Roebuck and Co., Hoffman Estates, IL 60179, U.S.A.
Visit our website" www.sears.com/craftsman
• SAFETY
• ASSEMBLY
• OPERATION
• MAINTENANCE
• PARTS LIST
• ESPANOL, R 13
769-02003
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.
TABLE OF CONTENTS
Safety Rules .................................... 2
Warranty ....................................... 4
Assembly Instructions ............................ 5
Oil and Fuel Information ........................... 5
Starting/Stopping Instructions ...................... 6
Operating Instructions ............................ 6
Maintenance and Repair Instructions ................ 8
Cleaning and Storage ............................ 9
Troubleshooting Chart ........................... 10
Specifications ................................. 10
Parts List ..................................... 25
Service Numbers ........................ Back Cover
SPARK ARRESTOR NOTE
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 a Sears or other qualified service dealer to
install the Accessory Muffler Assembly, Part #753-05169.
the safety rules. Please read these instructions I
before operating the unit in order to ensure the safety I
I,_ WARNING: When using the unit, you must follow I
All information, illustrations, and specifications in this manual
are based on the latest product information available at the
time of printing. We reserve the right to make changes at any
time without notice.
of the operator and any bystanders. Please keep
these instructions for later use.
* IMPORTANT SAFETY INSTRUCTIONS *
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 must not operate the unit. Teens must be
accompanied and 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.
• Use only Hassle Free IIITM XTRA QUIET Spiral Line. Never use
metal-reinforced line, wire, chain or rope. These can break off
and become dangerous projectiles.
• 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.
FUEL SAFETY WARNINGS
[,_, ARNING: Gasoline is highly flammable and its
• Store fuel only in containers specifically designed and
approved for the storage of such materials.
vapors can explode if ignited. Take the following
precautions:
• 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.
• Mix and 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, take the unit
to a Sears or other qualified service dealer for an adjustment.
• Adjust the D-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. Be 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 (p. 6).
• Use the right tool. Only use this tool for its intended purpose.
• Always hold the unit with both hands when operating. Keep a
firm grip on both handles or grips.
• Keep hands, face, and feet away 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.
• Turn the engine to off and disconnect the spark plug for
maintenance or repair.
• Use only replacement parts or accessories recommended for
this tool that are distributed by Sears or a Craftsman outlet.
Use of any replacement parts or accessories purchased
elsewhere may be hazardous, and will also 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 a 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 (pilot lights, etc.) or
sparks (switches, electrical motors, etc.).
• Allow the engine to cool before storing or transporting. Be
sure to secure the unit while transporting.
• Store the unit in a dry place, secured or at a height to prevent
unauthorized use or damage. Keep 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 (p. 9).
• Keep these instructions. Refer to them often and use them to
instruct other users. If you loan this unit to others, also loan
them these instructions.
SAVE THESE INSTRUCTIONS
• 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
A • SAFETY ALERT SYMBOL
U in conjunction with other symbols or pictographs.
@
Indicates danger, warning or caution. May be used
• WARNING - READ OPERATOR'S MANUAL
Readthe operator's manual(s)and follow allwarnings
and safety instructions. Failureto do so can resultin
serious injuryto 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.
• UNLEADED FUEL
Always use clean, fresh unleaded fuel
• OIL
_ Refer to operator's manual for the proper type of oil.
• SHARP BLADE
WARNING: Sharo blade on cutttng attachment
shield. To prevent serious Injury, do net touch the
line cutting blade.
SYMBOL MEANING
, HOT SURFACE WARNING
Do not touch a hot muffler gear h0using or
_ CYlinder.you may get burne& These parts get
;_lllll_ll_t_t_, extreme y hot from operat on. They rema n hot for
a short time after the unit isturned off.
,,, THROWNOBJECTSANDROTATING
_7_1 b CUTTER CAN CAUSE SEVERE INJURY
/_,_" WARNING: Do not operate without the Cuttiag
J_
__/_ attach-ment shield in place. Keep away from the
[otating Cutting attachmenL
,KEEP BYSTANDERS AWAY
L_.?_,_ WARNING: Keep all bystanders, especially
children and pets, at !east 50 feet (!5 m) from
the operating area.
TWO YEAR FULL WARRANTY ON CRAFTSMAN GAS TRIMMER
When used and maintained according to the operator's manual, if this gas trimmer fails due to a defect in material or workmanship
within two years from the date of purchase, return it to any Sears store, other Craftsman outlet, or Sears Parts & Repair Center in the
United States for free repair (or replacement if repair proves impossible). This warranty excludes cutting line, spark plug and air filter,
which are expendable parts that can wear out from normal use in less than two years. This warranty applies for only 30 days from the
date of purchase if this gas trimmer is used for commercial or rental purposes. This warranty gives you specific legal rights, and you
may also have other rights which vary from state to state.
Sears, Roebuck and Co., Hoffman Estates, IL 60179
California / EPA Emission Control Warranty Statement
Your Warranty Rights and Obligations
The California Air Resources Board, The Environmental Protection Agency and Sears, Roebuck and Co., are pleased to explain the
emission control system warranty on your 2005 and later small off-road engine. New small off-road engines must be designed, built and
equipped to meet stringent anti-smog standards. Sears, Roebuck and Co. must warrant the emission control system on your small off-
road engine for the periods of time listed below provided there has been no abuse, neglect or improper maintenance of your small off-
road engine.
Your Emission control system may include parts such as the carburetor or fuel-injection system, the ignition system, and catalytic
converter. Also included may be hoses, belts, connectors and other emission-related assemblies.
Where a warrantable condition exists, Sears will repair your small off-road engine at no cost to you including diagnosis, parts and
labor.
The 2005 and later small off-road engines are warranted for two years. If any emission-related part on your engine is
defective, the part will be repaired or replaced by Sears.
Owner's Warranty Responsibilities
• As the small off-road engine owner, you are responsible for the performance of the required maintenance listed in your operator's
manual. Sears recommends that you retain all receipts covering maintenance on your small off-road engine, but Sears cannot deny
warranty solely for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance.
• As the small off-road engine owner, you should however be aware that Sears may deny you warranty coverage ifyour small off-road
engine or a part has failed due to abuse, neglect, improper maintenance or unapproved modifications.
• You are responsible for presenting your small off-road engine to a Sears authorized service center as soon as problem exists. The
warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days.
If you have any questions regarding your warranty rights and responsibilities, you should call 1-800-4-MY-HOME ®.
Manufacturer's Warranty Coverage
• The warranty period begins on the date the engine or equipment is delivered to the retail purchaser.
• The manufacturer warrants to the initial owner and each subsequent purchaser, that the engine is free from defects in material and
workmanship which cause the failure of a warranted part for a period of two years.
• Repair and replacement of warranted part will be performed at no charge to the owner at an authorized Sears service center. For
the nearest location please contact Sears at: 1-800-4-MY-HOME ®.
• Any warranted part which is net scheduled for replacement, as required maintenance or which is scheduled only for regular
inspection to the effect of "Repair or Replace as Necessary" is warranted for the period. Any warranted part which is scheduled for
replacement as required maintenance will be warranted for the period of time up to the first scheduled replacement point for that
part.
• The owner will not be charged for diagnostic labor which leads to the determination that a warranted part is defective if the
diagnostic work is performed at an authorized Sears Service Center.
• The manufacturer is liable for damages to other engine components caused by the failure of a warranted part still under warranty.
• Failures caused by abuse, neglect or improper maintenance are not covered under warranty.
• The use of add-on or modified parts can be grounds for disallowing a warranty claim. The manufacturer is not liable to cover failures
of warranted parts caused by the use of add-on or modified parts.
• In order to file a claim, go to your nearest authorized Sears Service Center. Warranty service or repairs will be provided at all
authorized Sears Service Centers.
• Any manufacturer approved replacement part may be used in the performance of any warranty maintenance or repair of emission
related parts and will be provided without charge to the owner. Any replacement part that is equivalent in performance or durability
may be used in non-warranty maintenance or repair and will not reduce the warranty obligations of the manufacturer.
• The following components are included in the emission related warranty: engine, air filter, carburetor, primer, fuel lines, fuel pick
up/fuel filter, ignition module, spark plug and muffler.
INSTALL AND ADJUST THE D-HANDLE
Install
1. Place the D-handle down on to the
shaft housing and the bottom
clamp so that the handle slants
toward the shaft grip (Fig. 1). Place
handle and clamp a minimum of 6
inches from the end of the shaft
grip.
2. Start screws with a flat-head or T-
25 Torx screwdriver. Do not
tighten until handle is adjusted.
Adjust
3. While holding the unit in the _ ,,,
operating position (Fig. 2), position Fig. 2
the D-handle to the location that provides you the best grip.
4. Tighten the clamp screws evenly until the D-handle is secure.
INSTALL LINE TRIMMER ATTACHMENT
NOTE: To make installation easier, place the unit on the
ground or on a workbench.
1. Turn knob counterclockwise to loosen coupler (Fig. 11, p. 7).
2. While firmly holding attachment, push it straight into the
coupler until the release button snaps into the primary hole
(Fig. 12, p. 7).
NOTE: Aligning the release button with the guide recess (Fig.
12, p. 7)will help installation.
3. Turn the knob clockwise to tighten.
LINE TRIMMER APPLICATIONS
Cutting grass and light weeds; edging; and decorative trimming
around trees, fences, etc.
Primer
Bulb
Spark Plug
Shaft Grip
Fuel Cap On/Off Stop Control
Starter Rope
Grip
Shaft Grip
D-Handle
Twist & Edge and
Convertible TM
Cutting
Attachment
Shield
Muffler
Air Filter/Muffler
Cover
Hassle Free lip
On/OffStop Control
Shaff
Housing
Throttle Control
Coupler
Shaft Housing
Line Cutting
Blade
(4) Screws
CAUTION: For proper engine operation and
maximum reliability, pay strict attention to the oil and I
fuel mixing instructions on the 2-cycle oil container. I
Using improperly mixed fuel can severely damage
the eng ne.
[_IWARN'NG: Rem°vefue'capsl°w'Yt° av°idinjury
To Obtain Correct Fuel Mix:
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. 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. Do not mix
from fuel spray. Never operate the unit without the
fuel cap securely in place.
UNLEADEDGAS 2-CYCLE OIL
UNLEADED GAS 2 CYCLE OIL
1 GALLON US 3.2 FL. OZ.
(3.8 LITERS) (95 ml)
1 LITER 25 ml
MIXING RATIO - 40:1
Minimum 6
(15.24 cm)
D-Han_
Bottom Clamp
Fig. 1
WARNING: Add fuel in a clean, well ventilated
outdoor area. Wipe up any spilled fuel immediately.
Avoid creating a source of ignition for spilt fuel. Do
not start the engine until fuel vapors dissipate.
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.
them directly in the engine fuel tank. See the Fuel Mixture Table
for specific gas and oil mixing ratios.
OIL AND FUEL MIXING INSTRUCTIONS
Old and/or improperly mixed fuel are the main reasons for the
unit not running properly. Be sure to use fresh (less than 60
days old), 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
fuelandoilseparateandleadstoformationofacidsduring
storage.Whenusingalcohol-blendedfuel,usefreshfuel.
Using Blended Fuels
If you choose to use a blended fuel, or its use is unavoidable,
follow recommended precautions:
_, WARNING: Operate this unit only in a well-
,_ you are in the starting position when pulling the starterrope (Fig. 5). To avoid serious injury, the operator and
STARTING INSTRUCTIONS
STOPPING INSTRUCTIONS
1. Release your hand from the throttle control. Allow the
2. Press and hold On/Off Stop Control in the OFF (O) position
ventilated outdoor area. Carbon monoxide exhaust
fumes can be lethal in a confined area.
_ ARNING: Avoid accidental starting. Make sure
unit must be in a stable position while starting.
1. Mix gas with oil.
2. Fill the fuel tank with the fuel/oil mixture. See Oil and
Fuel Mixing Instructions.
NOTE: There is no need to turn the unit on. The On/Off
Stop Control is in the ON ( I) position at all times.
3. Fully press and release the primer bulb 10 times,
slowly. Some amount of fuel should be visible in the
primer bulb and fuel lines (Fig. 4). If you can't see fuel
in the bulb, press and release the bulb as many times
as it takes until you can see fuel in it.
4. Crouch in the starting position (Fig. 5). Do not
squeeze the throttle, and pull the starter rope with a
controlled and steady motion until the unit starts.
Wait 10 to 15 seconds, then squeeze the throttle to
control the cutting speed.
IF... the engine does not start, go back to step 3.
NOTE: The unit uses the Incredi-Pull TM starting system
with MAX FIRE IGNITION TM , which significantly
reduces the effort required to start the engine. You
must pull the starter rope out far enough to hear the
engine attempt to start. There is no need to pull the
rope briskly-- there is no harsh resistance when pulling.
Be aware that this starting method is vastly different
from (and much easier than) what you may be used to.
engine to cool down by idling.
until engine comes to a complete stop (Fig. 3)
• Always use the fresh fuel mix explained in the operator's manual
• Always shake the fuel mix before fueling the unit
• Drain the tank and run the engine dry before storing the unit
NOTE: Dispose of the old fuel/oil mix in accordance to
Federal, State and Local regulations.
Stop/Off (O)
Start/On
Throttle
Control
Fig. 3
Fig. 4
Starting
Position
,ncredi-Pu,/
Throttle
Fig. 5
body protection to reduce the risk of injury when
WARNING:Always wear eye, hearing, foot and
operating this unit.
HOLDING THE TRIMMER
Before operating the unit, stand in the operating position (Fig.
6). Check for the following:
• The operator is wearing eye protection and proper clothing
• With a slightly-bent right arm, the operator's hand is holding
the shaft grip
• The operator's left arm is slightly bent, the left hand holding
the D-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 over
LINE REPLACEMENT
for Hassle-Free liftMCutting Head
Always use Craftsman Hassle-Free
IIFMXTRA QUIET Spiral Line, Choose
the line size best suited for the job at
hand. Red colored line is designed for
cutting grass and small weeds. Black
colored line is designed for cutting
larger weeds and light brush.
NOTE: Before inserting new line into
the holes in the cutting head,
identify the proper holes. Follow
directions as shown on the line
glide plate. Do Not attempt to
remove the cutting head from the
unit when replacing line.
blade assembly. Excessive line length will make the
clutch overheat. This may lead to serious personal
WARNING:Do not remove or alter the line cutting
injury or damage to the unit.
1. Remove the old line and line glide plate from the cutting
head. Cutting Line Glide
2. Clean entire surface of cut- Nead_ Plate Arrow
ting head. Note positions "A" /J_ /_'_/_ ]. j
and "B" on the cutting head. ((I if//_::_}
3. Reinstall line glide plate (Fig. "_J/ t_/_-/_::_J/,_/ I
7). Align arrow with: __,._"A" when using medium (red) or
large (black) line, or
"B" when using lines with
diameters smaller than
medium (red)line
NOTE: Line glide plate must
be reinstalled in cutting
head before inserting new
line.
4. Insert both ends of your
line through the proper
holes in the side of the
cutting head (Fig. 8).
5. Pull the line and make
sure the line is against the
hub and is fully extended
through the positioning
tunnels (Fig. 9).
6. Correctly installed line will be the same length on both sides.
NOTE: Do not rest the Hassle-Free IIITM Cutting Head on the
ground while the unit is running.
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
TIPS FOR BEST TRIMMING RESULTS
• Keep the cutting attachment parallel to the ground.
• Cut from left to right whenever possible. Cutting to the right
improves the unit's cutting efficiency. Clippings are thrown
away from the operator.
• Trim only when grass and weeds are dry.
• The life of your cutting line is dependent upon:
- Following the trimming tips
- What vegetation is being cut \\
- Where vegetation is being cut
DECORATIVE TRIMMING
Decorative trimming is
accomplished by removing all
vegetation around trees, posts,
fences and more. Rotate the
whole unit so that the cutting Fig. 10
attachment is at a 30 °angle to the
ground (Fig. 10).
attachment, read and understand the manual that
came with the attachment. Follow all safety
WARNING: Before you begin using any
information contained within.
30 °
J
T
Fig. 7
Positioning
Tunnel
Fig. 8
ainst
the hub
Positioning
Tunnel
Fig. 9
_L ARNING: To avoid serious personal injury and
USING THE TWIST AND EDGE TM 90° Edging Hole
FEATURE (TrimmerOnly)
You can convert this unit to edge grass.
1. Make sure the unit is turned
2.
3.
Craftsman Convertible TM Primary Hole
4. Turn the knob clockwise to lock _._
Craftsman Convertible Feature
The coupler allows you to convert
this unit for use with the following
add-on attachments:
• Cultivator
• Blade Edger
• Blower
• Brush Cutter
• Pruner Fig. 13
To Install Attachments
NOTE: To make installation easier, place the unit on the ground
1. Make sure the unit is turned completely off.
2. Turn the knob counterclockwise to loosen the coupler (Fig. 11).
3. While firmly holding the attachment, push it straight into the
4. Turn the knob clockwise to tighten.
To Remove Attachments
1. Make sure the unit is turned completely off.
2. Turn the knob counterclockwise to loosen the coupler (Fig. 11).
3. Press and hold the release button (Fig. 12).
4. While firmly holding the upper shaft boom (Fig. 13), pull the
damage to the unit, shut the unit off before
removing or installing add-ons.
completely off.
Turn the knob counterclockwise
to loosen coupler (Fig. 11).
Push in the release button (Fig. 12) Knob
and twist the shaft 90° until the
release button snaps into the 90°
hole (Fig. 11).
Coupler \ \ _/
////_ \\\ Guide
Knob _ Recess
Fig. 12
the coupler (Fig. 13). _M Attachm_ent_ _//B°°m
CAUTION: These add-on attachments are to be I
snapped into the primary hole only. Using the wrong
hoe cou dead to persona n ury or damage to the un t.
or on a workbench.
coupler until the release button (Fig. 12) snaps into the
primary hole (Fig. 12). The primary hole is on the opposite
side of the coupler from the knob (Fig. 12). Align the release
button with the Guide Recess (Fig. 12) to help installation.
that the release button is fully snapped into the
CAUTION: Before operating this unit, be sure I
primary hole (Fig. 12), and that the knob (Fig. 13) is
securely tightened.
attachment out of the coupler.
Fig. 11
Release Button
Upper Shaft "-_
I
I
MAINTENANCE SCHEDULE
perform maintenance or repairs with unit running. I
,_ I WARNING: To prevent serious injury, never I
Always service and repair a cool unit, Disconnect the
spark pug w re to ensure that the un t cannot start,
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: Maintenance, replacement, or repair of the emission
control devices and system may be performed by a Sears
or other qualified service dealer. Call 1-800-4-MY-HOME ®
for more information.
In order to assure peak performance of your engine, inspection
of the engine exhaust port may be necessary after 50 hours of
operation, Ifyou 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 a
Sears or other qualified service dealer. Call 1-800-4-MY-
HOME ®for more information. 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 SEE
Before star_ing Fill fuel tank with fresh fuel p. 5
engine
Every 10 hours Clean and re-oil air filter p. 8
Every 25 hours
Every 50 hours arrestor screen for clogging or p. 9
AIR FILTER MAINTENANCE
Check and clean spark arrestor p. 8
Check spark plug condition and gap p. 9
Inspect exhaust port and spark
obstruction
WARNING: To avoid serious personal injury,
always turn your unit off and allow it to cool before
clean or service it,
Removing the Air Filter/Muffler Cover
1. Remove the four (4)screws
securing the air filter/muffler
cover (Fig, 14). Use a fiat
blade or T20 Torx bit
screwdriver.
2. Pull the cover from the
engine. Do not force.
Cleaning the Air Filter
,Screws
Failure to maintain your air
filter properly can result in poor
performance or can cause
permanent damage to your
engine,
1. Remove air filter/muffler
cover. Refer to Removing Fig. 14
the Air Filter/Muffler Cover
above,
2. Turn cover over and look inside to locate the air filter.
Remove the air filter from inside the air filter/muffler cover
(Fig. 15).
3, Wash the filter in
detergent and water
(Fig. 16). 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 (Fig, 17).
5. Squeeze the filter to
spread and remove
excess oil (Fig, 18).
6. Replace the air filter
Fig. 15
inside the air filter/muffler
cover (Fig, 15).
Fig. 16 Fig. 17
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
(Fig, 12) and tighten. Do not over J ,
tighten. Fig. 18
SPARK ARRESTOR MAINTENANCE
NOTE: Pay close attention when disassembling the muffler so
you can put it back together correctly. Failure to do so will
damage the unit and may cause serious personal injury.
1. Remove air filter/muffler cover. Refer to Removing the Air
Filter/Muffler Cover (p. 8).
2, Locate the muffler, but do not remove it. Find the screw on
the bottom of the muffler (Fig. 19). This screw holds the Spark
Arrestor Hood Assembly and the spark arrestor screen to the
bottom of the muffler, Remove this screw using either aTorx
T20 or flat blade screwdriver,
3. Using a small flat blade screwdriver, carefully pry up the
spark arrestor screen from the recessed hole, taking care to
notice that the "raised" part of the spark arrestor screen is
inside the recessed hole. Remove the spark arrestor screen
from the muffler.
4. Clean the spark arrestor screen with a wire brush, Replace it
if it is damaged, or if you are unable to clean it thoroughly.
5, Reinstall the spark arrestor screen by putting the "raised" portion
of the screen inside the recessed hole of the muffler, Make sure
that the spark arrestor screen fits flat against the muffler.
6, Place the spark arrestor plate on top of the spark arrestor screen
with the raised side up and the opening facing toward the engine
(Fig. 19)
7, Place the spark arrestor hood on top of the spark arrestor
platewiththe
"raised"sideup
Spark Arrestor
Hoo
Slots
To Engine
andthe
AWAYfromthe
engine(Fig.19).
openingfacing_-_.1.
Verifythatthe _'
exhaustwillbe
directed AWAY Screw
from the Tabs Screen
engine. Fig. 19
8. Replace the screw you removed in Step 2 and tighten
securely.
9. Reinstall the air filter/muffler cover (Fig. 14).
WARNING: Ifthe spark arrestor hood and spark
arrestor screen are not tightened securely, they could
fall off causing damage to the unit and possible
serious personal injury.
Spark Arrestor
Muffler
REPLACING THE SPARK PLUG
Use a Champion RDJ7Y spark plug or equivalent. 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 boot
firmly and pull it from the spark plug. Spark Plug
2. Clean around the spark plug. 0.020 in.
Remove the spark plug from the (0.5 ram)
cylinder head by turning a 5/8-inch
socket counterclockwise.
3. Replace a cracked, fouled or dirty f
spark plug. Set the air gap at 0.020 Fig. 21
in. (0.5 ram} using a feeler gauge (Fig. 21).
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.olb. (12.3-13.5 N°m). Do not over-tighten.
5. Reattach the plug boot.
_ ARNING: Do not sand blast, scrape or clean I
spark plug electrodes. Grit in the engine could
damage the cylinder.
CARBURETOR ADJUSTMENT
The idle speed of the engine is adjustable through the air
filter/muffler cover (Fig. 20). Idle
NOTE: Careless adjustments can Speed
seriously damage your unit. X Screw
Contact a Sears or other
qualified service dealer to
make carburetor adjustments.
Call 1-800-4-MY-HOME ® for
more information.
Check Fuel Mixture Fig. 20
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 (p. 5).
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 (p. 8).
Adjust Idle Speed Screw
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 at a high idle for a minute to
warm up. Refer to Starting/Stopping Instructions (p. 6).
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 (Fig.
20). Turn the idle speed screw in, clockwise, 1/8 of a turn
at a time (as needed) until the engine idles smoothly.
3. If the engine appears to be idling too fast, 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 not, have
the carburetor adjusted by a Sears or other qualified service
dealer. Call 1-800-4-MY-HOME ® for more information.
WARNING: The cutting attachment may spin
during idle speed adjustments. Wear protective
clothing and observe all safety instructions to
)revent serious personal injury.
TRANSPORTING
° Allow the engine to cool before transporting.
* Drain fuel from unit.
* Tighten fuel cap before transporting.
* Secure the unit while transporting.
CLEANING
Use a small brush to clean off the outside of the unit. Do not
use strong detergents. Household cleaners that contain
aromatic oils such as pine and lemon, and solvents such as
kerosene, can damage plastic housing or handle. Wipe off any
_ ARNING: To avoid serious personal injury, I
moisture with a soft cloth.
STORAGE
= Never store a fueled unit where fumes may reach an open
flame or spark.
= Allow the engine to cool before storing.
= Store the unit locked up to prevent unauthorized use or
damage.
= Store the unit in a dry, well-ventilated area.
= Store the unit out of the reach of children.
LONG TERM STORAGE
If you plan on storing the unit for an extended time, use the
following storage procedure:
1. Carefully drain the fuel tank by running the unit dry or
2. Start the engine and allow it to run until it stalls. This
3. Allow the engine to cool. Remove the spark plug and put 1
NOTE: Remove the spark plug and drain all of the oil from the
4. Thoroughly clean the unit and inspect it for any loose or
always turn your trimmer off and allow it to cool
before you clean or maintain it.
remove fuel cap and tip the motor housing over and drain
oil/gas fuel into a container with the same 2-cycle fuel
mixture. Do not use fuel that has been stored for more than
60 days.
ensures that all fuel has been drained from the carburetor.
oz. (30 ml) of any high quality motor oil or 2-cycle oil into
the cylinder. Pull the starter rope slowly to distribute the oil.
Reinstall the spark plug.
cylinder before attempting to start the trimmer after storage.
damaged parts. Repair or replace damaged parts and
tighten loose screws, nuts or bolts. The unit is ready for
storage.
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