Lawn Boy 10641 Manual User Manual

Form No. 3361-328 Rev B  
20in Mulching/Rear Bagging Lawn  
Mower  
Model No. 10640—Serial No. 290000001 and Up  
Model No. 10640C—Serial No. 290000001 and Up  
Model No. 10641—Serial No. 290000001 and Up  
Model No. 10641C—Serial No. 290000001 and Up  
Model No. 10642—Serial No. 290000001 and Up  
Model No. 10642C—Serial No. 290000001 and Up  
Model No. 10643C—Serial No. 290000001 and Up  
Model No. 10644C—Serial No. 290000001 and Up  
Model No. 10645—Serial No. 290000001 and Up  
Model No. 10646—Serial No. 290000001 and Up  
Model No. 10647—Serial No. 290000001 and Up  
Operator's Manual  
Model No.  
Introduction  
Read this information carefully to learn how to operate  
and maintain your product properly and to avoid injury  
and product damage. You are responsible for operating  
the product properly and safely.  
Serial No.  
This manual identifies potential hazards and has  
safety messages identified by the safety alert symbol  
(Figure 2), which signals a hazard that may cause serious  
injury or death if you do not follow the recommended  
precautions.  
You may contact Lawn-Boy directly at  
www.Lawn-Boy.com for product and accessory  
information, help finding a dealer, or to register your  
product.  
Whenever you need service, genuine Lawn-Boy parts,  
or additional information, contact an Authorized  
Service Dealer or Lawn-Boy Customer Service and have  
the model and serial numbers of your product ready.  
Figure 1 identifies the location of the model and serial  
numbers on the product. Write the numbers in the  
space provided.  
Figure 2  
1. Safety alert symbol  
This manual uses two words to highlight information.  
Important calls attention to special mechanical  
information and Note emphasizes general information  
worthy of special attention.  
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.  
Figure 1  
1. Model and serial number plate  
Important: This engine is not equipped with a  
spark arrester muffler. It is a violation of California  
© 2008—Lawn-Boy® Inc.  
8111 Lyndale Avenue South  
Bloomington, MN 55420  
Original Instructions (EN)  
Printed in the USA  
All Rights Reserved  
   
• Mow across the face of slopes; never up and down.  
Exercise extreme caution when changing direction  
on slopes.  
possible, then refuel such equipment with a portable  
container, rather than from a gasoline dispenser  
nozzle.  
• Watch for holes, ruts, bumps, rocks, or other hidden  
objects. Uneven terrain could cause a slip and fall  
accident. Tall grass can hide obstacles.  
• Keep the nozzle in contact with the rim of the fuel  
tank or container opening at all times until fueling is  
complete. Do not use a nozzle lock-open device.  
• Do not mow on wet grass or excessively steep slopes.  
Poor footing could cause a slip and fall accident.  
• If fuel is spilled on clothing, change clothing  
immediately.  
• Do not mow near drop-offs, ditches, or  
embankments. You could lose your footing or  
balance.  
• Never overfill fuel tank. Replace gas cap and tighten  
securely.  
Children  
Exhaust contains carbon monoxide, an  
odorless, deadly poison that can kill you.  
Tragic accidents can occur if the operator is not alert to  
the presence of children. Children are often attracted to  
the machine and the mowing activity. Never assume  
that children will remain where you last saw them.  
Do not run the engine indoors or in an enclosed  
area.  
• Keep children out of the mowing area and under  
the watchful care of a responsible adult other than  
the operator.  
General Service  
• Never operate machine in a closed area.  
• Be alert and turn mower off if a child enters the area.  
• Never allow children to operate the machine.  
• Keep all nuts and bolts tight to be sure the equipment  
is in safe working condition.  
• Use extra care when approaching blind corners,  
shrubs, trees, or other objects that may block your  
view of a child.  
• Never tamper with safety devices. Check their  
proper operation regularly.  
• Keep machine free of grass, leaves, or other debris  
build-up. Clean up oil or fuel spillage and remove  
any fuel-soaked debris. Allow machine to cool  
before storing.  
Service  
Safe Handling of Gasoline  
• If you strike a foreign object, stop and inspect the  
machine. Repair, if necessary, before starting.  
To avoid personal injury or property damage, use  
extreme care in handling gasoline. Gasoline is  
extremely flammable and the vapors are explosive.  
• Never make any adjustments or repairs with the  
engine running. Disconnect the spark plug wire  
and ground against engine to prevent unintended  
starting.  
• Extinguish all cigarettes, cigars, pipes, and other  
sources of ignition.  
• Use only an approved gasoline container.  
• Check grass catcher components and the discharge  
guard frequently and replace with manufacturer’s  
recommended parts, when necessary.  
• Never remove gas cap or add fuel with the engine  
running. Allow engine to cool before refueling.  
• Never refuel the machine indoors.  
• Mower blades are sharp. Wrap the blade or wear  
gloves, and use extra caution when servicing them.  
• Never store the machine or fuel container where  
there is an open flame, spark, or pilot light such as  
on a water heater or on other appliances.  
• Do not change the engine governor setting or  
overspeed the engine.  
• Never fill containers inside a vehicle or on a truck  
or trailer bed with a plastic liner. Always place  
containers on the ground away from your vehicle  
before filling.  
• Maintain or replace safety and instruction labels, as  
necessary.  
• Remove gas-powered equipment from the truck  
or trailer and refuel it on the ground. If this is not  
3
Safety and Instructional Decals  
Important: Safety and instruction decals are located near areas of potential danger. Replace damaged  
decals.  
94-8072  
117-4143  
1. Warning—read the Operator’s Manual.  
2. Thrown object hazard—keep bystanders a safe distance  
from the machine.  
3. Cutting/dismemberment hazard of hand or foot, mower  
blade—disconnect the spark plug wire and read the  
instructions before servicing or performing maintenance.  
4. Cutting/dismemberment hazard of hand or foot, mower  
108-4791  
blade—stay away from moving parts and keep all guards  
and shields in place.  
5. Cutting/dismemberment hazard of hand or foot, mower  
blade—do not mow up and down slopes, only mow across;  
stop the mower and engine, pick up debris before operating;  
look behind and down when reversing.  
104-7953  
Electric-start models only  
1. Warning—read the Operator’s Manual for information on charging the battery; contains lead; do not discard.  
2. Read the Operator’s Manual.  
4
2. Filling the Engine with Oil  
Setup  
Important: Remove and discard the protective  
Procedure  
plastic sheet that covers the engine.  
Your mower does not come with oil in the engine, but it  
does come with a bottle of oil.  
1. Unfolding the Handle  
1. Remove the dipstick (Figure 4).  
Procedure  
Folding or unfolding the handle improperly can  
damage the cables, causing an unsafe operating  
condition.  
• Do not damage the cables when folding or  
unfolding the handle.  
• If a cable is damaged, contact an Authorized  
Service Dealer.  
Figure 4  
1. Remove the handle knobs from the mower housing  
(Figure 3).  
2. Slowly pour oil into the oil fill tube until the oil level  
reaches the Full line on the dipstick (Figure 4). Do  
not overfill. (Max. fill: 20 oz. (0.59 l), type: SAE 30  
detergent oil with an API service classification of SF,  
SG, SH, SJ, SL, or higher.)  
Important: Route the cables to the outside of  
the handle as you install the handle.  
Note: If you overfill the engine, pour some oil out  
of it as directed in Changing the Engine Oil.  
3. Install the dipstick securely.  
Important: Change the engine oil after the first  
5 operating hours; change it yearly thereafter.  
Refer to Changing the Engine Oil.  
Figure 3  
1. Handle knob (2)  
3. Installing the Fuse  
2. Move the handle to the operating position.  
3. Install and tighten the handle knobs that you  
removed in step 1 (Figure 3).  
Procedure  
Electric-start models only  
Your mower comes with a 40-amp fuse that protects the  
electric starter.  
Important: You cannot start the mower with the  
electric starter or charge the battery unless you  
install the fuse.  
1. Unclip both ends of the battery cover and remove it  
(Figure 5).  
5
     
Product Overview  
Figure 5  
2. Insert the fuse into the fuse holder (Figure 6).  
Figure 7  
Self-propel model shown  
1. Spark plug  
8. Self-propel drive bar  
(self-propel models only)  
2. Primer (models 10643C  
and 10644C only)  
9. Ignition key (electric-start  
models only)  
3. Air filter  
4. Fuel tank cap  
10. Grass bag  
11. Battery (electric-start  
models only)  
Figure 6  
5. Oil fill/Dipstick  
12. Cutting height levers (4)  
6. Recoil start handle  
13. Battery charger  
(electric-start models  
only)  
3. Install the battery cover.  
7. Blade control bar  
4. Charging the Battery  
Procedure  
Operation  
Attachments/Accessories  
Electric-start models only  
Refer to Charging the Battery in the Maintenance  
section.  
A selection of Lawn-Boy approved attachments and  
accessories are available for use with the machine  
to enhance and expand its capabilities. Contact  
your Authorized Service Dealer or Distributor or  
go to www.Lawn-Boy.com for a list of all approved  
attachments and accessories.  
6
   
Filling the Fuel Tank  
Checking the Engine Oil Level  
Service Interval: Before each use or daily  
1. Remove the dipstick, wipe it clean, and fully install  
the dipstick (Figure 9).  
Gasoline is extremely flammable and explosive.  
A fire or explosion from gasoline can burn you  
and others.  
To prevent a static charge from igniting the  
gasoline, place the container and/or mower  
directly on the ground before filling, not in a  
vehicle or on an object.  
• Fill the tank outdoors when the engine is  
cold. Wipe up spills.  
• Do not handle gasoline when smoking or  
around an open flame or sparks.  
• Store gasoline in an approved fuel container,  
out of the reach of children.  
Figure 9  
2. Remove the dipstick and check the oil level  
(Figure 9). If the oil level is below the Add mark on  
the dipstick, slowly pour oil into the oil fill tube to  
raise the oil level to the Full mark on the dipstick.  
Do not overfill. (Max. fill: 20 oz. (0.59 l), type: SAE  
30 detergent oil with an API service classification of  
SF, SG, SH, SJ, SL, or higher.)  
Fill the fuel tank with fresh unleaded regular gasoline  
from a major name-brand service station (Figure 8).  
Important: To reduce starting problems, add  
fuel stabilizer to the fuel all season, mixing it with  
gasoline less than 30 days old.  
Note: If you overfill the engine, pour some oil out  
of it as directed in Changing the Engine Oil.  
3. Install the dipstick.  
Adjusting the Cutting Height  
Adjusting the cutting height may bring you into  
contact with the moving blade, causing serious  
injury.  
Figure 8  
• Stop the engine and wait for all moving parts  
to stop.  
• Do not put your fingers under the housing  
when adjusting the cutting height.  
If the engine has been running, the muffler will  
be hot and can severely burn you. Keep away  
from the hot muffler.  
Adjust the cutting height as desired. Set all four wheels  
to the same height.  
7
   
Note: To raise the mower, move all the cutting height  
levers forward; to lower the mower, move the all the  
cutting height levers rearward (Figure 10).  
Figure 12  
1. Blade control bar  
3. Turn the ignition key (Figure 13) (electric-start  
models only) or pull recoil start handle (Figure 14).  
Figure 10  
1. Raise the mower  
2. Lower the mower  
Note: The cutting height settings are 1 inch (25 mm);  
1-1/2 inch (38 mm); 2 inches (51 mm); 2-1/2 inches  
(64 mm); 3 inches (76 mm); 3-1/2 inches (89 mm); and  
4 inches (102 mm).  
Figure 13  
Starting the Engine  
1. Firmly push in the primer 3 times with your thumb,  
holding the primer in for a second before releasing  
it each time (models 10643C and 10644C only)  
(Figure 11).  
Figure 14  
Note: If the mower does not start after several  
attempts, contact an Authorized Service Dealer.  
Figure 11  
Note: If the air temperature is below 55°F (13°C),  
firmly push the primer in 5 times.  
2. Hold the blade control bar (Figure 12) against the  
handle.  
8
         
Using the Self-propel Drive  
Self-propel models only  
Mulching the Clippings  
Your mower comes from the factory ready to mulch the  
grass and leaf clippings back into the lawn.  
To operate the self-propel drive, squeeze the self-propel  
drive bar (Figure 15) toward the handle and hold it.  
If the grass bag is on the mower, remove it (refer to  
Removing the Grass Bag) before mulching the clippings.  
Bagging the Clippings  
Use the grass bag when you want to collect grass and  
leaf clippings from the lawn.  
A worn grass bag could allow small stones  
and other similar debris to be thrown in the  
operator’s or bystander’s direction and result in  
serious personal injury or death to the operator  
or bystanders.  
Figure 15  
1. Self-propel drive bar  
Check the grass bag frequently. If it is damaged,  
install a new Lawn-Boy replacement bag.  
To disengage the self-propel drive, release the self-propel  
drive bar.  
Note: The maximum self-propel ground speed is fixed.  
To reduce the ground speed, increase the space between  
the self-propel drive bar and the handle.  
The blade is sharp; contacting the blade can  
result in serious personal injury.  
Stopping the Engine  
Service Interval: Before each use or daily  
Stop the engine and wait for all moving parts to  
stop before leaving the operating position.  
To stop the engine, release the blade control bar  
(Figure 16).  
Installing the Grass Bag  
1. Lift up the rear deflector (Figure 17).  
Note: Remove the ignition key when you leave the  
mower (electric-start mowers only).  
Important: When you release the blade control  
bar, both the engine and blade should stop within  
3 seconds. If they do not stop properly, stop using  
your mower immediately and contact an Authorized  
Service Dealer.  
Figure 17  
Figure 16  
1. Rear deflector  
2. Insert the grass bag handle onto the notches on the  
handle brackets (Figure 17).  
9
     
– Walk at a slower pace while mowing.  
– Raise the cutting height on your mower.  
– Cut the grass more frequently.  
Removing the Grass Bag  
1. Lift up the rear deflector (Figure 17).  
2. Lift the grass bag handle out from the notches on the  
handle brackets and remove the bag from the mower.  
– Overlap cutting swaths instead of cutting a full  
swath with each pass.  
3. Close the rear deflector.  
– Set the cutting height on the front wheels one  
notch lower than the rear wheels. For example,  
set the front wheels at 2 inches (51 mm) and the  
rear wheels at 2-1/2 inches (64 mm).  
Operating Tips  
General Mowing Tips  
• Clear the area of sticks, stones, wire, branches, and  
other debris that the blade could hit.  
Cutting Leaves  
• After cutting the lawn, ensure that half of the lawn  
shows through the cut leaf cover. You may need to  
make more than one pass over the leaves.  
• Avoid striking solid objects with the blade. Never  
deliberately mow over any object.  
• If the mower strikes an object or starts to vibrate,  
immediately stop the engine, disconnect the wire  
from the spark plug, and examine the mower for  
damage.  
• If there are more than 5 inches (13 cm) of leaves  
on the lawn, set the front cutting height one or two  
notches higher than the rear cutting height.  
• For best performance, install a new blade before the  
cutting season begins.  
• Slow down your mowing speed if the mower does  
not cut the leaves finely enough.  
• Replace the blade when necessary with a Lawn-Boy  
replacement blade.  
Cutting Grass  
• Cut only about a third of the grass blade at a time.  
Do not cut below the 2 inch (51 mm) setting unless  
the grass is sparse or it is late fall when grass growth  
begins to slow down. Refer to Adjusting the Cutting  
Height.  
• When cutting grass over 6 inches (15 cm) tall, mow  
at the highest cutting height setting and walk slower;  
then mow again at a lower setting for the best lawn  
appearance. If the grass is too long, the mower may  
plug and cause the engine to stall.  
• Mow only dry grass or leaves. Wet grass and leaves  
tend to clump on the yard and can cause the mower  
to plug or the engine to stall.  
Wet grass or leaves can cause serious injury if  
you slip and contact the blade. Mow only in dry  
conditions.  
• Alternate the mowing direction. This helps disperse  
the clippings over the lawn for even fertilization.  
• If the finished lawn appearance is unsatisfactory, try  
one or more of the following:  
– Replace the blade or have it sharpened.  
10  
Maintenance  
Note: Determine the left and right sides of the machine from the normal operating position.  
Recommended Maintenance Schedule(s)  
Maintenance Service  
Maintenance Procedure  
Interval  
• Change the engine oil.  
After the first 5 hours  
• Check the engine oil level.  
• Ensure that the engine stops within 3 seconds after releasing the blade control bar.  
• Clean grass clippings and dirt from under the mower.  
Before each use or daily  
• Replace the air filter; replace it more frequently in dusty operating conditions.  
• Charge the battery for 24 hours (electric-start models only).  
Every 25 hours  
Before storage  
• Empty the fuel tank before repairs as directed and before annual storage.  
• Change the engine oil.  
• Replace the blade or have it sharpened (more frequently if the edge dulls quickly).  
• Refer to your Engine Operator’s Manual for any additional yearly maintenance  
procedures.  
Yearly  
Important: Refer to your Engine Operator’s Manual for additional maintenance procedures.  
Preparing for Maintenance  
1. Stop the engine and wait for all moving parts to stop.  
Tipping the mower may cause the fuel to leak.  
Gasoline is flammable, explosive and can cause  
personal injury.  
2. Disconnect the spark plug wire from the spark plug  
(Figure 18) before performing any maintenance  
procedure.  
Run the engine dry or remove the gasoline with  
a hand pump; never siphon.  
Figure 18  
1. Spark plug wire  
3. After performing the maintenance procedure(s),  
connect the spark plug wire to the spark plug.  
Important: Before tipping the mower to change  
the oil or replace the blade, allow the fuel tank  
to run dry through normal usage. If you must  
tip the mower prior to running out of fuel, use a  
hand fuel pump to remove the fuel. Always tip  
the mower onto its side with the dipstick down.  
11  
 
Replacing the Air Filter  
Service Interval: Every 25 hours  
1. Use a screw driver to open the air filter cover  
(Figure 19).  
Figure 21  
Figure 19  
3. Tip the mower onto its side, with the dipstick down,  
to drain the used oil out through the oil fill tube  
(Figure 22).  
2. Replace the air filter (Figure 20).  
Figure 20  
Figure 22  
3. Install the cover.  
4. Slowly pour oil into the oil fill tube until the oil level  
reaches the Full line on the dipstick (Figure 21). Do  
not overfill. (Max. fill: 20 oz. (0.59 l), type: SAE 30  
detergent oil with an API service classification of SF,  
SG, SH, SJ, SL, or higher.)  
Changing the Engine Oil  
Service Interval: After the first 5 hours  
Yearly  
Change the engine oil after the first 5 operating  
hours; change it yearly thereafter.  
Note: If you overfill the engine, pour some oil out  
of it as directed in step 3 above.  
Run the engine a few minutes before changing the oil  
to warm it. Warm oil flows better and carries more  
contaminants.  
5. Install the dipstick securely.  
6. Dispose of the used oil properly at a local recycling  
center.  
1. Perform the pre-maintenance procedures; refer to  
Preparing for Maintenance.  
2. Remove the dipstick (Figure 21).  
12  
         
Examine the blade whenever you run out of gasoline. If  
the blade is damaged or cracked, replace it immediately.  
If the blade edge is dull or nicked, have it sharpened or  
replace it.  
Charging the Battery  
Service Interval: Every 25 hours  
Electric-start models only  
Warning  
The blade is sharp; contacting the blade can  
result in serious personal injury.  
CALIFORNIA  
Proposition 65 Warning  
Battery posts, terminals, and related  
accessories contain lead and lead compounds,  
chemicals known to the State of California  
to cause cancer and reproductive harm.  
Wash hands after handling.  
Wear gloves when servicing the blade.  
1. Disconnect the spark plug wire from the spark plug.  
Refer to Preparing for Maintenance.  
2. Tip the mower onto its side, with the air filter up.  
3. Use a block of wood to hold the blade steady.  
Charge the battery for 24 hours initially, then monthly  
(every 25 starts) or as needed. Always use the charger  
in a sheltered area and charge the battery at room  
temperature (70° or 22° C) whenever possible.  
4. Remove the blade (turn the blade bolt  
counterclockwise), saving all the mounting hardware.  
5. Install the new blade (turn the blade bolt clockwise)  
and all mounting hardware (Figure 24).  
1. Connect the charger to the mower wire harness  
located below the ignition key (Figure 23).  
Figure 23  
2. Plug the charger into a wall outlet.  
Note: When the battery no longer holds a charge,  
recycle or dispose of the lead-acid battery according  
to local codes.  
Replacing the Fuse  
Electric-start models only  
Figure 24  
If the battery does not charge or the engine does not run  
with the electric starter, the fuse may be blown. Replace  
it with a 40-amp plug-in type fuse. Refer to Installing  
the Fuse.  
Important: Position the curved ends of the  
blade to point toward the mower housing.  
6. Use a torque wrench to tighten the blade bolt to  
60 ft-lb (82 N m).  
Replacing the Blade  
Service Interval: Yearly  
Important: A bolt torqued to 60 ft-lb (82 N m)  
is very tight. While holding the blade with a  
block of wood, put your weight behind the  
ratchet or wrench and tighten the bolt securely.  
This bolt is very difficult to overtighten.  
Important: You will need a torque wrench to install  
the blade properly. If you do not have a torque  
wrench or are uncomfortable performing this  
procedure, contact an Authorized Service Dealer.  
13  
   
Adjusting the Self-propel Drive Cleaning the Mower  
Cable  
Service Interval: Before each use or daily  
Self-propel models only  
Whenever you install a new self-propel cable or if  
the self-propel drive is out of adjustment, adjust the  
self-propel drive cable.  
The mower may dislodge material from under  
the mower housing.  
1. Loosen the cable support nut (Figure 25).  
• Wear eye protection.  
• Stay in the operating position (behind the  
handle).  
• Do not allow bystanders in the area.  
1. With the engine running on a flat paved surface,  
spray a stream of water in front of the right rear  
wheel (Figure 26).  
The water will splash into the path of the blade,  
cleaning out the clippings.  
Figure 25  
1. 1 to 1-1/2 inches (25 to 38 4. Cable support nut  
mm)  
Figure 26  
2. Self-propel drive bar  
3. Cable jacket  
5. Cable support  
2. When no more clippings come out, stop the water  
and move the mower to a dry area.  
2. Hold the self-propel bail 1 to 1-1/2 inches (25 to 38  
mm) from the handle (Figure 25).  
3. Run the engine for a few minutes to dry the housing  
to prevent it from rusting.  
3. Pull down the cable jacket (toward the mower) until  
there is no slack in the cable (Figure 25).  
4. Tighten the nut on the cable support.  
5. Release the self-propel drive bar and ensure that the  
cable is loose.  
Note: The cable must be loose with the self-propel  
drive bar in the released position; otherwise, the  
mower may creep when the bar is disengaged.  
14  
   
Folding the Handle  
Storage  
Store the mower in a cool, clean, dry place.  
Folding or unfolding the handle improperly can  
damage the cables, causing an unsafe operating  
condition.  
Preparing the Mower for  
Storage  
• Do not damage the cables when folding or  
unfolding the handle.  
• If a cable is damaged, contact an Authorized  
Service Dealer.  
Gasoline vapors can explode.  
• Do not store gasoline more than 30 days.  
1. Loosen the handle knobs until you can move the  
handle freely (Figure 27).  
• Do not store the mower in an enclosure near  
an open flame.  
• Allow the engine to cool before storing it.  
1. On the last refueling of the year, add fuel stabilizer  
to the fuel as directed by the engine manufacturer.  
2. Run the mower until the engine stops from running  
out of fuel.  
3. Prime the engine and start it again.  
4. Allow the engine to run until it stops. When you can  
no longer start the engine, it is sufficiently dry.  
5. Disconnect the wire from the spark plug and connect  
the wire onto the retaining post.  
6. Remove the spark plug, add 1 oz. (30 ml) of oil  
through the spark plug hole, and pull the starter rope  
slowly several times to distribute oil throughout the  
cylinder to prevent cylinder corrosion during the  
off-season.  
Figure 27  
7. Loosely install the spark plug.  
1. Handle knob (2)  
8. Tighten all nuts, bolts, and screws.  
9. Charge the battery for 24 hours, then unplug the  
battery charger an store the mower in an unheated  
area. If you must store the mower in a heated  
area, you must charge the battery every 90 days  
(electric-start models only).  
2. Move the handle forward as shown in Figure 27.  
Removing the Mower from  
Storage  
1. Remove the spark plug and spin the engine rapidly  
using the starter to blow the excess oil from the  
cylinder.  
2. Install the spark plug and tighten it with a torque  
wrench to 15 ft-lb (20 Nm).  
3. Charge the battery for 24 hours (electric-start models  
only).  
4. Connect the wire to the spark plug.  
15  
 
The Lawn-Boy No-Worry Warranty  
A Two-Year Full Warranty (45 day Limited Warranty for Commercial Use)  
A Three-Year Power Train Full Warranty for Residential Use (Limited Warranty for Commercial use)  
20 in.  
Mulching/  
Rear Bagging  
Lawn Mower  
The Lawn-Boy Tru-Start Commitment  
A Three-Year Full Warranty (Not applicable for Commercial Use)  
Conditions and Products Covered  
under the No-Worry Warranty  
Pickup and delivery charges  
Operational misuse, neglect, or accidents  
Repairs or attempted repairs by anyone other than an Authorized  
Lawn-Boy Service Dealer  
Lawn-Boy® Inc. and its affiliate, Lawn-Boy Warranty Company, pursuant  
to an agreement between them, jointly promise to repair any Lawn-Boy  
Product used for residential purposes*, if defective in materials or  
workmanship or if it stops functioning due to the failure of a component  
for the periods listed below.  
Repairs or adjustments to correct starting difficulties due to the  
following:  
Failure to follow proper maintenance procedures  
Rotary mower blade striking an object  
This Warranty applies to all 20 in. Lawn-Boy lawn mowers and their  
accessories. This warranty covers the cost of parts and labor, but you  
must pay transportation costs.  
Contaminants in the fuel system  
Improper fuel (consult your Operator’s Manual if in doubt)  
The following time periods apply from the date of purchase:  
Failure to drain the fuel system prior to any period of non-use  
over one month  
Products  
Warranty Period  
Product and Attachments  
Power Train** (Engine and Transmission)  
2 year full warranty  
3 year full warranty  
1 year  
Special operational conditions where starting may require more than  
two pulls:  
Batteries  
Wear Items (Belts, blades, blade adaptors,  
grass bags, cables, and wheels)  
90 days  
First time starts after extended period of non-use over one month  
or seasonal storage  
Cool temperature starts such as those found in early spring and  
late autumn  
Limited Warranty  
under the No-Worry Warranty for Commercial Use  
Improper starting procedure  
Gas-powered Lawn-Boy Products used at more than one location, or used  
for institutional or rental use, are warranted for 45 days against defects  
in materials or workmanship. Components failing due to normal wear  
are not covered by this warranty.  
If you are having difficulty starting your unit, please check the Operator’s  
Manual to ensure that you are using the correct starting procedures. This  
can save an unnecessary visit to a Service Dealer.  
Instructions for Obtaining Warranty Service  
Coverage under the Tru-Start Commitment  
If you think that your Lawn-Boy Product contains a defect in materials or  
workmanship, or if a normal, able-bodied adult can no longer start your  
product’s engine in one or two pulls, follow this procedure:  
Lawn-Boy® Inc. and its affiliate, Lawn-Boy Warranty Company, pursuant  
to an agreement between them, jointly promise that your Tru-Start engine,  
when used for residential purposes*, will start on the first or second pull  
for three (3) years from the date of purchase, if you provide the routine  
maintenance it requires, or we will fix it free of charge.  
1. Contact any Authorized Lawn-Boy Service Dealer to arrange service  
at their dealership. To locate a dealer convenient to you, refer to  
the Yellow Pages of your telephone directory (look under “Lawn  
also call the numbers listed in item #3 to use the 24-hour Lawn-Boy  
Dealer locator system.  
This Warranty applies to all 20 in. Lawn-Boy lawn mowers. This warranty  
covers the cost of parts and labor, but you must pay transportation costs.  
This Lawn-Boy Commitment does not apply when the product is used  
commercially.*  
2. Bring the product and your proof of purchase (sales receipt) to the  
Service Dealer. The dealer will diagnose the problem and determine  
if it is covered under warranty.  
The following applies to both  
the No-Worry Warranty and the Tru-Start Commitment  
3. If for any reason you are dissatisfied with the Service Dealer’s  
analysis or with the assistance provided, contact us at: Customer  
Care Department, Consumer Division, Lawn-Boy Warranty Company,  
8111 Lyndale Avenue South, Bloomington, MN 55420-1196; or call  
us toll free at 866-216-6032 (U.S. customers) or 866-216-6031  
(Canadian customers).  
Owner Responsibilities  
You must maintain your Lawn-Boy Product by following the maintenance  
procedures described in the Operator’s Manual. Such routine  
maintenance, whether performed by a dealer or by you, is at your expense.  
General Conditions  
Items and Conditions Not Covered  
All repairs covered by these warranties must be performed by an  
Authorized Lawn-Boy Service Dealer using Lawn-Boy approved  
replacement parts.  
There is no other express warranty except for special emission system  
coverage on some products. This express warranty does not cover the  
following:  
Neither Lawn-Boy® Inc. nor Lawn-Boy Warranty Company is liable  
for indirect, incidental, or consequential damages in connection with  
the use of the Lawn-Boy Products covered by these warranties,  
including any cost or expense of providing substitute equipment  
or service during reasonable periods of malfunction or non-use  
pending completion of repairs under these warranties.  
Cost of regular maintenance service or parts, such as filters, fuel,  
lubricants, oil changes, spark plugs, air filters, blade sharpening/worn  
blade on mowers, cable/linkage adjustments, or brake and clutch  
adjustments  
Any product or part which has been altered or misused and requires  
replacement or repair due to accidents or lack of proper maintenance  
Some states do not allow exclusions of incidental or consequential  
damages, so the above exclusions may not apply to you.  
Repairs necessary due to improper battery care, failure to use fresh  
fuel (less than one month old), or failure to properly prepare the unit  
prior to any period of non-use over one month  
This warranty gives you specific legal rights, and you may also have other  
rights which vary from state to state.  
Countries Other than the United States or Canada  
Customers who have purchased Lawn-Boy products exported from the United States or Canada should contact their Lawn-Boy Distributor (Dealer)  
to obtain guarantee policies for your country, province, or state. If for any reason you are dissatisfied with your Distributor’s service or have difficulty  
obtaining guarantee information, contact the Lawn-Boy importer. If all other remedies fail, you may contact us at Lawn-Boy Warranty Company.  
*Residential purposes means use of the product on the same lot as your home. Use at more than one location, or institutional or rental use, is considered  
commercial use and the commercial use warranty would apply.  
**Power Train coverage includes engine and transmission only. The transmission is defined as the gear case, internal components, and axles.  
374-0256 Rev B  

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