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

product at www.lawnboy.com/register. Please allow 1 to 2

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

8111 Lyndale Avenue South

Bloomington, MN 55420

Original Instructions (EN)

Printed in the USA

*3402-418*

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

Setup

Important: Remove and discard the protective plastic

sheet that covers the engine.

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).

Figure 5

2. Rope guide

1. Recoil-starter rope

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.

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).

•

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.

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).

Charging the Battery

(Electric-start model only)

No Parts Required

Figure 7

Procedure

1. Handle

2. Frame

3. Grass bag

Refer to Charging the Battery (Electric-start model only)

(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).

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)

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.

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).

•

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.

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.

•

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.

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.

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.

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.

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).

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).

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.

Remove the Machine from

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.

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

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”)

or access our web site at www.Lawn-Boy.com. You may also call

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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