Lawn Boy 10734 Manual User Manual

Form No. 3402-418 Rev A  
21in Mulching/Rear Bagging Lawn  
Mower  
Model No. 10730—Serial No. 316000001 and Up  
Model No. 10732—Serial No. 316000001 and Up  
Model No. 10734—Serial No. 316000001 and Up  
Model No. 17730—Serial No. 316000001 and Up  
Model No. 17732—Serial No. 316000001 and Up  
Model No. 17734—Serial No. 316000001 and Up  
Operator's Manual  
Introduction  
This rotary-blade, walk-behind lawn mower is intended  
to be used by residential homeowners. It is designed  
primarily for cutting grass on well-maintained lawns  
on residential properties. It is not designed for cutting  
brush or for agricultural uses.  
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.  
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.  
Figure 2  
1. Safety alert symbol  
This manual uses 2 words to highlight information.  
Important calls attention to special mechanical information  
and Note emphasizes general information worthy of special  
attention.  
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.  
Receive a complimentary side-discharge chute by completing  
the Discharge Chute Order Form when you register your  
weeks for delivery (subject to availability).  
WARNING  
CALIFORNIA  
Proposition 65 Warning  
This product contains a chemical or chemicals  
known to the State of California to cause cancer,  
birth defects, or other reproductive harm.  
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  
Model No.  
Serial No.  
It is a violation of California Public Resource Code  
Section 4442 or 4443 to use or operate the engine on any  
forest-covered, brush-covered, or grass-covered land unless  
the engine is equipped with a spark arrester, as defined in  
Section 4442, maintained in effective working order or the  
© 2015—Lawn-Boy® Inc.  
8111 Lyndale Avenue South  
Bloomington, MN 55420  
Original Instructions (EN)  
Printed in the USA  
All Rights Reserved  
*3402-418*  
A
     
Safety and Instructional Decals  
Important: Safety and instruction decals are located near areas of potential danger. Replace damaged decals.  
Manufacturer's Mark  
1. Indicates that the blade is identified as a part from the  
original machine manufacturer.  
94-8072  
104-7953 (Electric-start model 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.  
117–2718  
3
 
Setup  
Important: Remove and discard the protective plastic  
sheet that covers the engine.  
1
Unfolding the Handle  
No Parts Required  
Procedure  
117-4143  
1. Warning—read the Operator's Manual.  
WARNING  
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.  
Folding or unfolding the handle improperly can  
damage the cables, causing an unsafe operating  
condition.  
4. Cutting/dismemberment hazard of hand or foot, mower  
blade—stay away from moving parts and keep all guards  
and shields in place.  
• Do not damage the cables when folding or  
unfolding the handle.  
• If a cable is damaged, contact an Authorized  
Service Dealer.  
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.  
1. Remove the handle knobs from the machine housing  
(Figure 3).  
Figure 3  
1. Handle knob (2)  
Important: Route the cables to the outside of the  
handle as you unfold the handle (Figure 4).  
4
     
Figure 5  
2. Rope guide  
1. Recoil-starter rope  
3
Filling the Engine with Oil  
No Parts Required  
Figure 4  
Electric-start model shown  
1. Cables  
2. Wiring harness  
3. Handle  
Procedure  
Important: Your machine does not come with oil in  
the engine. Before starting the engine, fill the engine  
with oil.  
(electric-start model only)  
2. Move the handle to the operating position (Figure 3).  
1. Move the machine to a level surface.  
3. Install the handle knobs and tighten them firmly by  
hand.  
2. Remove the dipstick (Figure 6) and pour about 3/4 of  
the crankcase capacity of oil into the oil-fill tube.  
Note: Max. fill: 0.53 L (18 oz), type: 10W-30 or SAE  
30 detergent oil with an API service classification of  
SJ or higher.  
2
Installing the Recoil-Starter  
Rope in the Rope Guide  
No Parts Required  
Procedure  
Important: To start the engine safely and easily  
whenever you use the machine, install the recoil-starter  
rope in the rope guide.  
Hold the blade-control bar to the upper handle and pull the  
recoil-starter rope through the rope guide on the handle  
(Figure 5).  
Figure 6  
3. Wipe off the dipstick with a clean cloth.  
4. Insert the dipstick into the oil-fill tube, but do not  
screw it in.  
5. Remove the dipstick and read the oil level on the  
dipstick (Figure 6).  
5
             
If the oil level is low, add a small amount of oil  
slowly to the oil-fill tube, and then repeat steps  
3 through 5 until the oil level on the dipstick is  
correct.  
5
If the oil level is high, drain the excess oil until the  
oil level on the dipstick is correct. To drain the  
excess oil, refer to Changing the Engine Oil (page  
15).  
Assembling the Grass Bag  
No Parts Required  
Important: If the oil level in the crankcase is  
too low or too high and you run the engine,  
you may damage the engine.  
Procedure  
1. Slip the grass bag over the frame as shown in Figure 7.  
6. 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 (page 15).  
4
Charging the Battery  
(Electric-start model only)  
No Parts Required  
Figure 7  
Procedure  
1. Handle  
2. Frame  
3. Grass bag  
(page 16).  
Note: Do not slip the bag over the handle (Figure 7).  
2. Hook the bottom channel of the bag onto the bottom  
of the frame (Figure 8).  
6
     
Product Overview  
Figure 9  
Electric-start model shown  
1. Self-propel-drive bar  
(self-propel model only)  
7. Ignition key (electric-start  
model only)  
Figure 8  
2. Recoil-start handle  
8. Battery (not shown;  
electric-start model only)  
3. Grass bag  
9. Fuel-tank cap  
10. Air filter  
3. Hook the top and side channels of the bag onto the top  
and sides of the frame, respectively (Figure 8).  
4. Oil fill/Dipstick  
5. Cutting-height lever (2)  
6. Blade-control bar  
11. Spark plug  
12. Battery charger  
(electric-start model only)  
7
   
Attachments/Accessories  
Operation  
A selection of Lawn-Boy approved attachments and  
accessories is 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.  
Before Operation  
Before Operation Safety  
General Safety  
Filling the Fuel Tank  
Become familiar with the safe operation of the equipment,  
operator controls, and safety signs.  
DANGER  
Check that all guards and safety devices, such as deflectors  
and/or grass catcher, are in place and working properly.  
Gasoline is extremely flammable and explosive. A  
fire or explosion from gasoline can burn you and  
others.  
Always inspect the machine to ensure that the blades,  
blade bolts, and cutting assembly are not worn or  
damaged.  
To prevent a static charge from igniting the  
gasoline, place the container and/or machine  
directly on the ground before filling, not in a  
vehicle or on an object.  
Inspect the area where you will use the machine and  
remove all objects that the machine could throw.  
Adjusting the cutting height may bring you into contact  
with the moving blade, causing serious injury.  
• Fill the tank outdoors when the engine is cold.  
Wipe up spills.  
– Shut off the engine and wait for all moving parts to  
stop.  
• Do not handle gasoline when smoking or around  
an open flame or sparks.  
– Do not put your fingers under the housing when  
adjusting the cutting height.  
• Store gasoline in an approved fuel container, out  
of the reach of children.  
Fuel Safety  
DANGER  
Fuel is extremely flammable and highly explosive.  
A fire or explosion from fuel can burn you and  
others and can damage property.  
For best results, use only clean, fresh (less than 30 days  
old), unleaded gasoline with an octane rating of 87 or  
higher ((R+M)/2 rating method).  
Oxygenated fuel with up to 10% ethanol or 15% MTBE  
by volume is acceptable.  
To prevent a static charge from igniting the fuel,  
place the container and/or machine directly on  
the ground before filling, not in a vehicle or on  
an object.  
Ethanol: Gasoline with up to 10% ethanol (gasohol)  
or 15% MTBE (methyl tertiary butyl ether) by volume  
is acceptable. Ethanol and MTBE are not the same.  
Gasoline with 15% ethanol (E15) by volume is not  
approved for use. Never use gasoline that contains  
more than 10% ethanol by volume, such as E15  
(contains 15% ethanol), E20 (contains 20% ethanol), or  
E85 (contains up to 85% ethanol). Using unapproved  
gasoline may cause performance problems and/or engine  
damage which may not be covered under warranty.  
• Fill the fuel tank outdoors, in an open area, when  
the engine is cold. Wipe up any fuel that spills.  
• Do not handle fuel when smoking or around an  
open flame or sparks.  
• Store fuel in an approved container and keep it  
out of the reach of children.  
Do not use gasoline containing methanol.  
Do not store fuel either in the fuel tank or in fuel  
containers over the winter unless a fuel stabilizer is used.  
WARNING  
Do not add oil to gasoline.  
Fuel is harmful or fatal if swallowed. Long-term  
exposure to vapors can cause serious injury and  
illness.  
Important: To reduce starting problems, add fuel  
stabilizer to the fuel all season, mixing it with gasoline  
less than 30 days old.  
• Avoid prolonged breathing of vapors.  
• Keep your hands and face away from the nozzle  
and the fuel-tank opening.  
• Keep fuel away from your eyes and skin.  
8
         
Important: If the oil level in the crankcase is  
too low or too high and you run the engine,  
you may damage the engine.  
6. Install the dipstick securely.  
Adjusting the Cutting Height  
WARNING  
Adjusting the cutting height may bring you into  
contact with the moving blade, causing serious  
injury.  
• Stop the engine and wait for all moving parts  
to stop.  
Figure 10  
• Do not put your fingers under the housing when  
adjusting the cutting height.  
Checking the Engine-Oil Level  
Service Interval: Before each use or daily  
CAUTION  
Max. fill: 0.53 L (18 oz), type: 10W-30 or SAE 30 detergent  
oil with an API service classification of SJ or higher.  
If the engine has been running, the muffler will be  
hot and can severely burn you. Keep away from the  
hot muffler.  
1. Move the machine to a level surface.  
2. Remove the dipstick (Figure 11).  
Adjusting the Cutting Height  
(High-wheel model only)  
Adjust the cutting height as desired. Set the front wheels and  
the rear wheels to the same height.  
Note: To raise or lower the machine, move the cutting-height  
levers as shown in Figure 12.  
Figure 11  
3. Wipe off the dipstick end with a clean cloth.  
4. Insert the dipstick into the oil-fill tube, but do not  
screw it in.  
Figure 12  
5. Remove the dipstick and read the oil level; refer to  
Figure 11.  
1. Raise the machine  
2. Lower the machine  
If the oil level is low, add a small amount of oil  
slowly to the oil-fill tube, and then repeat steps  
3 through 5 until the oil level on the dipstick is  
correct.  
Note: The cutting height settings are 32 mm (1-1/4 inches);  
44 mm (1-3/4 inches); 57 mm (2-1/4 inches); 70 mm (2-3/4  
inches); 83 mm (3-1/4 inches); and 95 mm (3-3/4 inches).  
If the oil level is high, drain the excess oil until the  
oil level on the dipstick is correct. To drain the  
excess oil, refer to Changing the Engine Oil (page  
15).  
9
           
Watch for holes, ruts, bumps, rocks, or other hidden  
objects. Uneven terrain could cause a slip-and-fall  
accident.  
Adjusting the Cutting Height  
(Regular-wheel model only)  
Adjust the cutting height as desired. Set the front wheels and  
the rear wheels to the same height.  
Stop the machine and inspect the blades after striking an  
object or if there is an abnormal vibration in the machine.  
Make all necessary repairs before resuming operation.  
Note: To raise or lower the machine, move the cutting-height  
levers as shown in Figure 13.  
Before leaving the operating position, shut off the engine,  
remove the key, and wait for all moving parts to stop.  
If the engine has been running the muffler will be hot and  
can severely burn you. Keep away from the hot muffler.  
Check the grass catcher components and the discharge  
guard frequently and replace them with the manufacturer’s  
recommended parts when necessary.  
Use accessories and attachments approved by the  
Lawn-Boy® Inc. only.  
Figure 13  
Slope Safety  
1. Raise the machine  
2. Lower the machine  
Mow across the face of slopes; never up and down. Use  
extreme caution when changing direction on slopes.  
Do not mow on excessively steep slopes. Poor footing  
could cause a slip-and-fall accident.  
Note: The cutting height settings are 32 mm (1-1/4 inches);  
44 mm (1-3/4 inches); 57 mm (2-1/4 inches); 70 mm (2-3/4  
inches); 83 mm (3-1/4 inches); and 95 mm (3-3/4 inches).  
Do not mow near drop-offs, ditches, or embankments.  
You could lose your footing or balance.  
During Operation  
Starting the Engine  
1. Hold the blade-control bar (Figure 14) against the  
handle.  
During Operating Safety  
General Safety  
Wear appropriate clothing, including eye protection;  
slip-resistant, substantial footwear; and hearing  
protection. Tie back long hair, secure loose clothing, and  
do not wear jewelry.  
Do not operate the machine while ill, tired, or under the  
influence of alcohol or drugs.  
Figure 14  
1. Blade-control bar  
The blade is sharp; contacting the blade can result in  
serious personal injury. Shut off the engine and wait for  
all moving parts to stop before leaving the operating  
position.  
2. Turn the ignition key (electric-start model only; refer to  
Figure 15) or pull the recoil-start handle (Figure 16).  
When you release the blade-control bar, the engine should  
shut off and the blade should stop within 3 seconds. If  
not, stop using your machine immediately and contact an  
Authorized Service Dealer.  
Operate the machine only in good visibility and  
appropriate weather conditions. Do not operate the  
machine when there is the risk of lighting.  
Figure 15  
Wet grass or leaves can cause serious injury if you slip and  
contact the blade. Mow only in dry conditions.  
Use extreme care when approaching blind corners,  
shrubs, trees, or other objects that may block your view.  
10  
           
Stopping the Engine  
Service Interval: Before each use or daily  
To stop the engine, release the blade-control bar (Figure 18).  
Note: Remove the ignition key when you leave the machine  
(electric-start model only).  
Figure 16  
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 machine  
immediately and contact an Authorized Service Dealer.  
Note: If the machine does not start after several  
attempts, contact an Authorized Service Dealer.  
Using the Self-propel Drive  
(Self-Propel model only)  
To operate the self-propel drive, squeeze the self-propel drive  
bar (Figure 17) toward the handle and hold it.  
Figure 18  
Mulching the Clippings  
Your machine comes from the factory ready to mulch the  
grass and leaf clippings back into the lawn.  
If the grass bag is on the machine, remove it before mulching  
the clippings. Refer to Removing the Grass Bag (page 12).  
Figure 17  
1. Self-propel drive bar  
Bagging the Clippings  
Use the grass bag when you want to collect grass and leaf  
clippings from the lawn.  
To disengage the self-propel drive, release the self-propel  
drive bar.  
WARNING  
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.  
A worn grass bag could allow small stones and  
other similar debris to be thrown toward you or  
bystanders, resulting in serious personal injury or  
death.  
Check the grass bag frequently. If it is damaged,  
install a new Lawn-Boy replacement bag.  
WARNING  
The blade is sharp; contacting the blade can result  
in serious personal injury.  
Stop the engine and wait for all moving parts to stop  
before leaving the operating position.  
11  
             
When cutting grass over 15 cm (6 inches) 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 machine may plug and cause  
the engine to stall.  
Installing the Grass Bag  
1. Lift up the rear deflector (Figure 19).  
Mow only dry grass or leaves. Wet grass and leaves tend  
to clump on the yard and can cause the machine to plug  
or the engine to stall.  
WARNING  
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 1  
or more of the following:  
Figure 19  
– Replace the blade or have it sharpened.  
– Walk at a slower pace while mowing.  
– Raise the cutting height on your machine.  
– Cut the grass more frequently.  
1. Rear deflector  
3. Rod end (2)  
4. Grass bag  
2. Notch in the handle  
bracket (2)  
2. Insert the rod ends of the grass bag into the notches  
in the handle brackets (Figure 19).  
– Overlap cutting swaths instead of cutting a full swath  
with each pass.  
3. Allow the rear deflector to rest on the bag.  
– Set the cutting height on the front wheels a notch  
lower than the rear wheels. For example, set the front  
wheels at 57 mm (2-1/4 inches) and the rear wheels  
at 70 mm (2-3/4 inches).  
Removing the Grass Bag  
1. Lift up the rear deflector (Figure 19).  
2. Lift the grass-bag handle out from the notches on the  
handle brackets and remove the bag from the machine.  
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 a single pass over the leaves.  
3. Close the rear deflector.  
Operating Tips  
If there are more than 13 cm (5 inches) of leaves on the  
lawn, set the front cutting height 1 or 2 notches higher  
than the rear cutting height.  
General Mowing Tips  
Clear the area of sticks, stones, wire, branches, and other  
debris that the blade could hit.  
Slow down your mowing speed if the machine does not  
cut the leaves finely enough.  
Avoid striking solid objects with the blade. Never  
deliberately mow over any object.  
After Operation  
If the machine strikes an object or starts to vibrate,  
immediately stop the engine, disconnect the wire from  
the spark plug, and examine the machine for damage.  
After Operating Safety  
For best performance, install a new blade before the  
cutting season begins.  
General Safety  
Replace the blade when necessary with a Lawn-Boy  
replacement blade.  
Clean grass and debris from the machine to help prevent  
fires. Clean up oil or fuel spills.  
Allow the engine to cool before storing the machine in  
any enclosure.  
Cutting Grass  
Cut only about a third of the grass blade at a time. Do not  
cut below the 44 mm (1-3/4 inch) setting unless the grass  
is sparse or it is late fall when grass growth begins to slow  
down. Refer to Adjusting the Cutting Height (page 9).  
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.  
12  
         
Hauling Safety  
Use care when loading or unloading the machine into a  
trailer or truck.  
Use full-width ramps for loading the machine into a  
trailer or truck. Do not exceed a 15° angle between the  
ramp and the trailer or truck.  
Tie the machine down securely using straps, chains, cable,  
or ropes. Both front and rear straps should be directed  
down and outward from the machine.  
Folding the Handle  
WARNING  
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.  
1. Loosen the handle knobs until you can move the  
handle freely (Figure 20).  
Figure 20  
1. Handle knob (2)  
2. Move the handle forward as shown in Figure 20.  
13  
   
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  
Before each use or daily  
After each use  
• 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 machine.  
• Check the air cleaner for dirty, loose, or damaged parts, and clean or replace them  
if necessary.  
• Charge the battery for 24 hours (electric-start model only).  
Every 25 hours  
• Replace the air cleaner element (more frequently when operating the machine  
in dusty or dirty operating conditions).  
• Clean the cooling system (refer to your engine owner's manual).  
• Replace the spark plug.  
Every 100 hours  
Before storage  
Yearly  
• 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 owner's manual for any additional yearly maintenance  
procedures.  
Important: Refer to your engine owner’s manual for additional maintenance procedures.  
Preparing for Maintenance  
Important: Before tipping the machine to change  
the oil or replace the blade, allow the fuel tank to  
run dry through normal usage. If you must tip  
the machine prior to running out of fuel, use a  
hand fuel pump to remove the fuel. Always tip the  
machine onto its side with the dipstick down.  
1. Stop the engine and wait for all moving parts to stop.  
2. Disconnect the spark-plug wire from the spark plug  
(Figure 21) before performing any maintenance  
procedure.  
WARNING  
Tipping the machine may cause the fuel to  
leak. Gasoline is flammable and explosive and  
can cause personal injury.  
Run the engine dry or remove the gasoline  
with a hand pump; never siphon.  
Figure 21  
1. Spark-plug wire  
3. After performing the maintenance procedure(s),  
connect the spark-plug wire to the spark plug.  
14  
       
Servicing the Air Cleaner  
Service Interval: Every 25 hours/Yearly (whichever comes  
first)—Check the air cleaner for dirty,  
loose, or damaged parts, and clean or  
replace them if necessary.  
Changing the Engine Oil  
Service Interval: After the first 5 hours  
Yearly  
Run the engine a few minutes before changing the oil to warm  
it. Warm oil flows better and carries more contaminants.  
Every 100 hours/Yearly (whichever comes  
first)—Replace the air cleaner element (more  
frequently when operating the machine in dusty or  
dirty operating conditions).  
1. Perform the pre-maintenance procedures; refer to  
Preparing for Maintenance (page 14).  
2. Tip the machine onto its side, with the dipstick down,  
to drain the used oil out through the oil-fill tube (Figure  
23).  
1. Perform the pre-maintenance procedures; refer to  
Preparing for Maintenance (page 14).  
2. Press down on the latch tabs on top of the air-cleaner  
cover (Figure 22).  
Figure 23  
3. Remove the dipstick.  
4. After draining the used oil, return the machine to the  
normal operating position.  
5. Pour about 3/4 of the crankcase capacity of oil into  
the oil-fill tube.  
Note: Max. fill: 0.53 L (18 oz), type: 10W-30 or SAE  
30 detergent oil with an API service classification of  
SJ or higher.  
Figure 22  
6. Wipe off the dipstick end with a clean cloth.  
1. Latch tabs  
2. Air-cleaner element  
7. Insert the dipstick into the oil-fill tube, but do not  
screw it in.  
3. Open the cover.  
8. Remove the dipstick and read the oil level on the  
dipstick (Figure 24).  
4. Replace the air-cleaner element.  
5. Install the cover.  
15  
         
Figure 25  
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.  
Figure 24  
Note: Your battery charger may have a 2-color LED display  
that indicates the following states of charging:  
If the oil level is low, add a small amount of oil  
slowly to the oil-fill tube, and then repeat steps  
6 through 8 until the oil level on the dipstick is  
correct.  
A red light indicates that the charger is charging the  
battery.  
A green light indicates that the charger is fully charged or  
the charger is disconnected from the battery.  
If the oil level is high, drain the excess oil until the  
oil level on the dipstick is correct.  
A flashing light that alternates between red and green  
indicates that the battery is nearly fully charged. This state  
lasts only a few minutes until the battery is fully charged.  
Important: If the oil level in the crankcase is  
too low or too high and you run the engine,  
you may damage the engine.  
Replacing the Fuse  
(Electric-start model only)  
9. Install the dipstick securely.  
10. Recycle the used oil properly.  
Your machine comes with a fuse that protects the electric  
starter. 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.  
Charging the Battery  
(Electric-start model only)  
Service Interval: Every 25 hours  
Important: You cannot start the machine with the  
electric starter or charge the battery unless you install  
the fuse.  
WARNING  
1. Unclip the battery cover and remove it (Figure 26).  
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.  
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.  
Figure 26  
1. Connect the charger to the wire harness located below  
the ignition key (Figure 25).  
1. Battery cover  
2. Foam  
3. Battery  
4. Fuse holder  
2. Insert the fuse into the fuse holder (Figure 27).  
16  
         
Figure 27  
3. Install the battery cover.  
Replacing the Blade  
Service Interval: Yearly  
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.  
Figure 28  
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.  
Important: Position the curved ends of the blade  
to point toward the machine housing.  
6. Use a torque wrench to tighten the blade bolt to 82  
N-m (60 ft-lb).  
WARNING  
The blade is sharp; contacting the blade can result  
in serious personal injury.  
Important: A bolt torqued to 82 N-m (60 ft-lb) 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.  
• Disconnect the wire from the spark plug.  
• Wear gloves when servicing the blade.  
1. Disconnect the spark-plug wire from the spark plug.  
Refer to Preparing for Maintenance (page 14).  
2. Tip the machine onto its side, with the air filter up.  
3. Use a block of wood to hold the blade steady.  
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 28).  
17  
     
Adjusting the Self-Propel Drive Cleaning the under the  
Cable (Self-propel model only) Machine  
Whenever you install a new self-propel cable or if the  
self-propel drive is out of adjustment, adjust the self-propel  
drive cable.  
Service Interval: After each use  
WARNING  
The machine may dislodge material from under the  
machine.  
1. Loosen the cable-support nut (Figure 29).  
• 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  
30).  
The water will splash into the path of the blade,  
cleaning out the clippings.  
Figure 29  
1. 25 to 38 mm (1 to 1-1/2  
inches)  
4. Cable-support nut  
5. Cable support  
2. Self-propel drive bar  
3. Cable jacket  
Figure 30  
2. Hold the self-propel bail 25 to 38 mm (1 to 1-1/2  
inches) from the handle (Figure 29).  
2. When no more clippings come out, stop the water and  
move the machine to a dry area.  
3. Pull down the cable jacket (toward the machine) until  
there is no slack in the cable (Figure 29).  
3. Run the engine for a few minutes to dry the underside  
of the machine to prevent it from rusting.  
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  
machine may creep when you disengage the bar.  
18  
     
Remove the Machine from  
Storage  
Storage  
Store the machine in a cool, clean, dry place.  
1. Check and tighten all fasteners.  
2. Remove the spark plug and spin the engine rapidly  
by pulling the recoil-start handle or using the electric  
starter (electric-start model only) to blow the excess  
oil from the cylinder.  
Preparing the Machine for  
Storage  
3. Install the spark plug and tighten it with a torque  
wrench to 20 N-m (15 ft-lb).  
WARNING  
Gasoline vapors can explode.  
4. Perform any maintenance procedures; refer to  
Maintenance (page 14).  
• Do not store gasoline more than 30 days.  
• Do not store the machine in an enclosure near  
an open flame.  
5. Check the engine-oil level; refer to Checking the  
Engine-Oil Level (page 9).  
• Allow the engine to cool before storing it.  
6. Fill the fuel tank with fresh gasoline; refer to Filling the  
Fuel Tank (page 8).  
1. On the last refueling of the year, add fuel stabilizer to  
the fuel as directed by the engine manufacturer.  
7. Connect the wire to the spark plug.  
8. Charge the battery for 24 hours (electric-start model  
only); refer to Charging the Battery (Electric-start  
model only) (page 16).  
2. Run the machine 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.  
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.  
7. Install the spark plug and tighten it with a torque  
wrench to 15 ft-lb (20 N-m).  
8. Tighten all nuts, bolts, and screws.  
9. Charge the battery for 24 hours, then unplug the  
battery charger an store the machine in an unheated  
area. If you must store the machine in a heated area,  
you must charge the battery every 90 days.  
19  
     
21 in. Mulching/Rear Bagging  
Walk Power Mowers  
The Lawn-Boy No-Worry Warranty  
A 2-Year Full Warranty (45 Day Limited Warranty for Commercial Use)  
The Lawn-Boy True Start Commitment  
A 3-Year Full Warranty (Not Applicable for Commercial Use)  
Conditions and Products Covered  
Items and Conditions Not Covered  
Lawn-Boy Inc. and its affiliate, Lawn-Boy Warranty Company, pursuant  
to an agreement between them, jointly promise to repair the Lawn-Boy  
Product listed below if used for residential purposes*; if it is defective in  
materials or workmanship or if it stops functioning due to the failure of a  
component; or if the Lawn-Boy True Start engine will not start on the first or  
second pull, provided the routine maintenance required in the Operator's  
Manual have been performed.  
There is no other express warranty except for special emission system  
coverage and engine warranty coverage on some products. This express  
warranty does not cover the following:  
Cost of regular maintenance service or parts, such as filters, fuel,  
lubricants, oil changes, spark plugs, air filters blade sharpening or worn  
blades, cable/linkage adjustments, or brake and clutch adjustments  
Components failing due to normal wear  
This warranty covers the cost of parts and labor, but you must pay  
transportation costs.  
Any product or part which has been altered or misused or neglected  
and requires replacement or repair due to accidents or lack of proper  
maintenance  
The following time periods apply from the date of purchase:  
Products  
Warranty Period  
2 - year full warranty  
Pickup and delivery charges  
21 in. Mulching/Rear Bagging  
Mowers and Attachments  
True Start Commitment  
Engine  
Repairs or attempted repairs by anyone other than an Authorized  
Lawn-Boy Service Dealer  
3 - year full warranty  
3 - year full warranty  
1 - year full warranty  
90 days  
Repairs necessary due to failure to follow recommended fuel  
procedure (consult Operator's Manual for more details)  
Battery  
Wear Items (Belts, blades, blade  
adaptors, grass bags, cables, and  
wheels)  
Removing contaminants from the fuel system is not covered  
Use of old fuel (more than one month old) or fuel which contains  
more than 10% ethanol or more that 15% MTBE  
Limited Warranty for Commercial Use*  
Failure to drain the fuel system prior to any period of non-use  
over one month  
Gas-powered Lawn-Boy Products used for commercial, 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.  
Repairs or adjustments to correct starting difficulties due to the  
following:  
Failure to follow proper maintenance procedures or recommended  
fuel procedure  
The True Start Commitment does not apply when the product is used  
commercially*.  
Rotary mower blade striking an object  
Special operational conditions where starting may require more than  
two pulls:  
Instructions for Obtaining Warranty Service  
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:  
First time starts after extended period of non-use over three  
months or seasonal storage  
Cool temperature starts such as those found in early spring and  
late autumn  
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 Mowers”)  
the numbers listed in item #3 to use the 24-hour Lawn-Boy Dealer  
locator system.  
Improper starting procedures - 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 an Authorized Lawn-Boy Service Dealer.  
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.  
General Conditions  
All repairs covered by these warranties must be performed by an Authorized  
Lawn-Boy Service Dealer using Lawn-Boy-approved replacement parts.  
Repair by an Authorized Lawn-Boy Service Dealer is your sole remedy  
under this warranty.  
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  
Lawn-Boy Inc.  
8111 Lyndale Avenue South  
Bloomington, MN 55420-1196  
Toll free at 866-216-6032 (U.S. customers)  
Toll free at 866-216-6031 (Canadian customers)  
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.  
Some states do not allow exclusions of incidental or consequential  
damages, so the above exclusions may not apply to you.  
Owner Responsibilities  
You must maintain your Lawn-Boy Product by following the maintenance  
procedures described in the Operator's Manual. Such routine maintenance, This warranty gives you specific legal rights, and you may also have other  
whether performed by a dealer or by you, is at your expense. 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.  
Australian Consumer Law: Australian customers will find details relating to the Australian Consumer Law either inside the box or at your local  
Lawn-Boy Dealer.  
*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.  
374-0256 Rev F  

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