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Form No. 3384-164 Rev A

21in Mulching/Rear Bagging Lawn
Mower

Model No. 10738—Serial No. 314000001 and Up

Operator's Manual

Receive a free side-discharge chute by
completing the

Discharge Chute Order

Form

when you register your product at

www.Lawn-Boy.com! Please allow four to five
weeks for delivery.

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.

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.

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 1

1.

Model and serial number plate

Model No.

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.

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.

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.

Important:

This engine is not equipped with a spark

arrester muffler. It is a violation of California Public
Resource Code Section 4442 to use or operate the engine
on any forest-covered, brush-covered, or grass-covered
land. Other states or federal areas may have similar laws.

This spark ignition system complies with Canadian ICES-002.

The enclosed

Engine Owner's Manual

is supplied for

information regarding the US Environmental Protection

© 2014—Lawn-Boy® Inc.
8111 Lyndale Avenue South
Bloomington, MN 55420

Register at www.LawnBoy.com.

Original Instructions (EN)

Printed in the USA

All Rights Reserved

*3384-164* A

Summary of Contents for 10738

Page 1: ...gure 1 1 Model and serial number plate Model No Serial No This manual identifies potential hazards and has safety messages identified by the safety alert symbol Figure 2 which signals a hazard that ma...

Page 2: ...avoid possible injury or death Improperly using or maintaining this mower could result in injury or death To reduce this potential comply with the following safety instructions The following instructi...

Page 3: ...proved gasoline container Never remove the gas cap or add fuel with the engine running Allow the engine to cool before refueling Never refuel the machine indoors Never store the machine or fuel contai...

Page 4: ...r truck Use full width ramps for loading the machine into a trailer or truck Tie the machine down securely using straps chains cable or ropes Both the front and the rear straps should be directed down...

Page 5: ...wire and read the instructions before servicing or performing maintenance 4 Cutting dismemberment hazard of hand or foot mower blade stay away from moving parts and keep all guards and shields in plac...

Page 6: ...bs and tighten them firmly by hand Installing the Recoil starter Rope in the Rope Guide Important To start the engine safely and easily whenever you use the machine install the recoil starter rope in...

Page 7: ...n the excess oil refer to Changing the Engine Oil page 13 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 sec...

Page 8: ...r 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 tha...

Page 9: ...be hot and can severely burn you Keep away from the hot muffler 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...

Page 10: ...agging the Clippings Use the grass bag when you want to collect grass and leaf clippings from the lawn WARNING A worn grass bag could allow small stones and other similar debris to be thrown at you or...

Page 11: ...t 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 Mow only dry grass o...

Page 12: ...e 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 manua...

Page 13: ...Warm oil flows better and carries more contaminants 1 Perform the pre maintenance procedures refer to Preparing for Maintenance page 12 2 Remove the dipstick 3 Tip the machine onto its side with the...

Page 14: ...s Note Your battery charger may have a 2 color LED display that indicates the following states of charging A red light indicates that the charger is charging the battery A green light indicates that t...

Page 15: ...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 Adjusting the Self...

Page 16: ...el as directed by the engine manufacturer 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...

Page 17: ...from Storage 1 Remove the spark plug and spin the engine rapidly by pulling the recoil start handle to blow the excess oil from the cylinder 2 Install the spark plug and tighten it with a torque wrenc...

Page 18: ...Notes 18...

Page 19: ...Notes 19...

Page 20: ...rts 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...

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