Lawn-Boy GoldPro Series User manual

Operator’s Manual
Para obtener una versión gratis de este manual en español, escriba a la dirección
indicada más abajo. Asegúrese de indicar el modelo y el número de serie de su producto.
Pour obtenir gratuitement une version en français de ce manuel, écrivez à l’adresse
ci–dessous. N’oubliez pas d’indiquer les numéros de modèle et de série de votre produit.
Lawn-Boy Inc., Attn: Parts Dept., 81 1 1 L yndale A ve S, Bloomington, MN 55420–1 196.
FORM NO. 3321–750 Rev A
Walk-Behind Power Mower
GoldPro Series
Model No. 10424, 10525, 10547 — 9900001 & Up

ELawn-Boy Inc. – 1999
All Rights Reserved Printed in USA
2
Contents
Page
Introduction 2.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safe Operating Practices 3 . . . . . . . . . . . . . . . . . . . .
Safety and Instruction Decals 5 . . . . . . . . . . . . . . . . .
Assembly 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Handle 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cover Plate 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery (Model 10547) 7 . . . . . . . . . . . . . . . . . . . . . .
Before Starting 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Mix Ratio 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mixing Gasoline And Oil 8 . . . . . . . . . . . . . . . . . . . .
Lawn Preparation And Mowing 9 . . . . . . . . . . . . . . .
Operation 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting Engine 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stopping Engine 10 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self-propelled Drive 11 . . . . . . . . . . . . . . . . . . . . . . . .
Adjusting Cutting Height 11 . . . . . . . . . . . . . . . . . . . .
Mulching T
ips 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Maintenance Schedule 13 . . . . . . . . .
Air Filter 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spark Plug 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clean Mower Housing 15 . . . . . . . . . . . . . . . . . . . . . .
Blade 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lubrication 17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self-propelled Cable 18 . . . . . . . . . . . . . . . . . . . . . . .
Exhaust Ports 18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery (Model 10547) 19 . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Grass Catcher 21 . . . . . . . . . . . . . . . . . . . . . . . . .
Mulch Plate 23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage 24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel 24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine 24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Folding Handle 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing From Storage 25 . . . . . . . . . . . . . . . . . . . .
Warranty Back Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WARNING
The engine exhaust fr om this pr oduct contains
chemicals known to the State of California to
cause cancer , birth defects, or other
repr oductive harm.
Introduction
Thank you for purchasing a Lawn-Boy product.
All of us at Lawn-Boy want you to be completely satisfied
with your new product, so feel free to contact your local
Authorized Service Dealer for help with service, genuine
Lawn-Boy parts, or other information you may require.
Whenever you contact your Authorized Service Dealer or
the factory , always know the model and serial numbers of
your product. These numbers will help the Service Dealer
or Service Representative provide exact information about
your specific product. Y ou will find the model and serial
number decal located in a unique place on the product as
shown below .
1149

1. Model and Serial Number Decal
For your convenience, write the product model and serial
numbers in the space below .
Model No:
Serial No.
Read this manual carefully to learn how to operate and
maintain your product correctly . Reading this manual will
help you and others avoid personal injury and damage to
the product. Although Lawn-Boy designs, produces and
markets safe, state-of-the-art products, you are responsible
for using the product properly and safely . Y ou are also
responsible for training persons who you allow to use the
product about safe operation.
The Lawn-Boy warning system in this manual identifies
potential hazards and has special safety messages that help
you and others avoid personal injury , even death.
DANGER, W ARNING and CAUTION are signal words
used to identify the level of hazard. However , regardless
of the hazard, be extremely careful.
DANGER signals an extreme hazard that will cause
serious injury or death if the recommended precautions
are not followed.

3
WARNING signals a hazard that may cause serious injury
or death if the recommended precautions are not followed.
CAUTION signals a hazard that may cause minor or
moderate injury if the recommended precautions are not
followed.
T
wo other words are also used to highlight information.
“Important” calls attention to special mechanical
information and “Note” emphasizes general information
worthy of special attention.
The left and right side of the machine is determined by
standing behind the handle in the normal operator ’s
position.
The 2-stroke engine provided on this product meets the EP A
Phase I Non-Road Emissions regulations for engines under
19 KW . This product does not comply to CARB TIER 1
regulations and cannot be sold in California.
Safety
This machine meets or exceeds CPSC blade safety
requir ements for walk-behind r otary mowers and the
B71.1 specifications of the American National
Standards Institute, in effect at time of pr oduction.
However
, impr oper use or maintenance by the
operator or owner can r esult in injury . T o r educe the
potential for injury , comply with these safety
instructions and always pay attention to the safety alert
symbol which means CAUTION, W ARNING or
DANGER—“personal safety instruction.” Failur e to
comply with the instruction may r esult in personal
injury.
Safe Operating Practices
This product is capable of amputating hands and feet and
throwing objects. Always follow all safety instructions to
avoid serious injury or death.
WARNING
POTENTIAL HAZARD
• Engine exhaust contains carbon monoxide,
which is an odorless, deadly poison.
WHA T CAN HAPPEN
• Carbon monoxide can kill you and is also
known to the State of California to cause birth
defects.
HOW T O A V OID THE HAZARD
• Do not run engine indoors or in an enclosed
area.
This mower is designed for cutting and mulching grass or ,
when equipped with a grass bag, for catching cut grass.
Any use for purposes other than these could prove
dangerous to user or bystanders.
Note: This engine is NOT equipped with a spark arrester
muffler . Use or operation of this mower in the State of
California on any forest-covered, brush-covered or
unimproved grass-covered land, without an approved
spark arrester muf fler , is a violation of the law . Other
states may have similar laws.
General Operation
1. Read this manual carefully before operating the
mower . Become familiar with the controls and proper
use of the mower. Never allow children under 16 years
of age to operate the mower . Never allow adults to
operate mower without proper instructions.
2. The operator of the mower is responsible for keeping
everyone, especially children and pets, away from area
of operation. The operator is responsible for accidents
or hazards occurring to other people or their property .
3.
Thoroughly inspect area where mower will be used
and remove sticks, stones, wire, and debris. W atch for
foreign objects while mowing.
4. W ear long pants and substantial shoes. Do not operate
mower while wearing open-toed shoes, jewelry , loose
clothing or when barefoot.
5. Check fuel level before starting engine. Do not fill fuel
tank indoors, when the engine is running, or until
engine cools for several minutes after running. Do not
smoke while refueling. W ipe up spilled gasoline
before starting engine.
6. Keep all guards, shields, grass catchers and safety
devices in place. Repair or replace damaged parts,
including decals. Check all safety devices before each
use.
7.
Engine, blade and self-propelled drive are designed to
stop when control bails are released. Ensure control
and brake function properly before each use of mower .
8.
Because fuel is highly flammable, handle it carefully .
A.
Use an approved container .

4
B. Fill fuel tank outdoors, not indoors. NEVER ADD
FUEL T O AN ENGINE THA T IS RUNNING
OR HOT .
C.
Install gas cap on fuel container and gas tank, and
wipe up any spilled gasoline before starting engine.
9. Before using, always visually inspect to see that the
blades, blade bolts and cutter assembly are not worn or
damaged. Replace worn or damaged blades and bolts
in sets to preserve balance.
While Operating
1. Do not run engine indoors.
2. Do not upend mower when starting engine. If
necessary , tilt mower so that blade points away from
operator and bystanders.
3. Start the engine carefully according to instructions and
with feet well away from the blade.
4. Always maintain secure footing. Keep a firm grip on
the handle and walk; never run. Never operate mower
in wet grass. Mow only in daylight or in good artificial
light.
5.
Mow across the face of slopes; never up and down.
Use extreme caution when changing direction on
slopes. Do not mow excessively steep slopes. W ear
skid resistant shoes on slopes.
6. Always wear safety glasses or eye shields during
operation to protect eyes from foreign objects that may
be thrown from the machine.
7. Keep face, hands, and feet away from the mower
housing and cutter blade when the engine is running.
Blade can cause injury to hands and feet.
8. Use extreme caution when reversing or pulling the
mower toward you.
9. Stay behind the handle until the engine stops and keep
clear of dischar ge opening at all times.
10. When bagging grass, stop engine and stay behind
handle until all moving parts stop before removing and
emptying bag.
11. When mowing, ensure grass bag or mulch plate is
installed over discharge opening.
12. Shut engine of f and stay behind handle until all
moving parts stop before unclogging chute.
13. Since the blade rotates for a few seconds after the
blade control bail is released, stay behind the handle
until all moving parts stop.
14. After striking a foreign object or if mower vibrates
abnormally , stop engine and remove wire from spark
plug. Check mower for damage and make all repairs
before using mower again. If major repairs are ever
needed or if assistance is desired, contact your local
Authorized Lawn-Boy Service Dealer .
15.
Stop the engine and wait for all moving parts to stop
before adjusting the height-of-cut.
16. Stop the blade when pushing the mower outside the
lawn area.
17. Stop engine before leaving the operator ’ s position —
behind the handle. Disconnect wire from spark plug if
mower will be unattended.
18. Do not touch engine while it is running or shortly after
it is stopped because engine will be hot enough to
cause a burn.
19. If mower must be lifted to be transported, turn of f
engine and stay behind the handle until all moving
parts stop.
Maintenance
1. Perform only those maintenance instructions described
in this manual. If major repairs are ever needed or if
assistance is desired, contact your local Authorized
Lawn-Boy Service Dealer .
2.
Before mower is cleaned, inspected, serviced, or
adjusted, stop engine and disconnect wire from spark
plug. Keep wire away from plug to prevent accidental
starting.
3. T
o assure the mower is in safe operating condition,
frequently check and keep all nuts, bolts, and screws
tight. Assure blade nut is tightened to 560 in.–lbs.
(47 ft.–lbs.) (63 N m).
4.
When servicing blade, refer to blade maintenance
section for correct installation and servicing
procedures.
5. T
o reduce fire hazard, keep engine free of excessive
grease, grass, leaves, and accumulations of dirt.
6. Do not overspeed the engine by changing governor
settings.
7.
Check grass catcher bag frequently for wear or
deterioration. Replace with a new bag when worn or
damaged for your protection.
8. Allow engine to cool before storing mower in any
enclosure. Do not store mower near any open flame or
where gasoline fumes may be ignited by a spark.
9. At the time of manufacture, the mower conformed to
the safety standards in ef fect for rotary mowers. T o
ensure best performance and continued safety
certification of the mower , use genuine Lawn-Boy
replacement parts and accessories. Replacement parts
and accessories made by other manufacturers may
result in nonconformance with the safety standards,
and that could be dangerous.

5
Safety and Instruction Decals
Safety decals and instructions are easily visible to the operator and are located near any
area of potential danger . Replace any decal that is damaged or lost.
ON MOWER HOUSING
(Part No. 43–8480)
ON CONSOLE
(Part No. 98–4469, Model 10525)
ON MOWER HOUSING
(Part No. 93–7250)
ON CONSOLE
(Part No. 98–4468, Model 10547)
Assembly
Handle
Assembly
1. Loosen handle knobs and lift top handle half in an arc
until handle halves are in line and nest together
(Fig. 1).
Note: Use care to prevent pinching or stretching of
cables.
2. T
ighten knobs securely .
3.
Rotate handle toward rear of mower .1144
2 1
Figure 1
1. Knob 2. Top handle half

6
Handle Height
Handle may be placed in three (3) operating positions,
high, medium or low (Fig. 2). Select a handle height
position that is most comfortable for you.
1382
3
1
24
6
7
5
Figure
2
1. High setting
2. Medium setting
3. Low setting
4. Mower housing
5. T raction cable bracket
6. T raction cable spring
7. Actuator bracket
1. Align holes in lower handle section with holes in
mower housing. Using hardware shown in Figure 2,
secure handle to mower housing.
(Self-pr opelled Models Only)
1. Hook traction cable spring into actuator bracket as
shown in Figure 2.
2. Match three (3) holes in traction cable bracket to three
(3) holes in left side of mower housing. Secure bracket
with handle hardware (Fig. 2).
Cover Plate
Your mower was shipped with a cover plate (Fig. 4). For
side dischar ge operation the plate must be installed into
deck opening.
WARNING
POTENTIAL HAZARD
• An uncover ed discharge opening will allow
objects to be thr own in operator ’ s or
bystander’ s dir ection. Also, contact with blade
could occur .
WHA
T CAN HAPPEN
•Thr own objects or blade contact can cause
serious injury .
HOW T O A V OID THE HAZARD
• Never operate mower unless cover plate, mulch
plate or grass chute and catcher ar e installed.
1. Stop engine and disconnect spark plug wire (Fig. 3)
before installing or removing cover plate.
m–3833
1
Figure 3
1. Spark plug wire
2. Remove knob that fastens cover plate to the housing
(Fig. 4).
m-1726
1
2
Figure
4
1. Cover plate 2. Knob

7
3. Two shoulder bolts on the housing protrude through
slotted holes in the cover plate and do not have to be
loosened or removed. Cover plate moves over the
shoulder bolt heads (Fig. 5).
995
11
Figure
5
1. Shoulder bolt
4. Slide cover plate clockwise to install or
counterclockwise to remove.
5. Secure with knob.
6. Connect spark plug wire (Fig. 3).
Battery (Model 10547)
A new battery must be char ged for 72 continuous hours to
ensure full char ge.
1. Char
ge battery . See MAINTENANCE chapter ,
Char
ging Battery section for instructions.
2. Connect leads from starter motor to battery (Fig. 6).
1353
1
2
Figure
6
1. Battery 2. Leads
3. Insert key into switch on control panel when you are
ready to start the engine (Fig. 7).
1349
1
Figure
7
1. Key
Before Starting
Oil Mix Ratio
Your Lawn-Boy mower is powered by a 2-cycle engine
which requires a 32:1 mixture of gasoline and oil. Use
only Lawn-Boy r GENERA TION II 2-Cycle Ashless
Oil, packaged in purple/green cans (Fig. 8) or an
equivalent pr emium grade 2-cycle ashless oil, certified
NMMA TCW III. Failure to use the correct oil or
mixture ratio could result in serious engine damage.
Figure 8
Lawn-Boy Generation II 2-Cycle Ashless Oil is
formulated specifically for Lawn-Boy and is available
from your Lawn-Boy retailer . Regular use of Lawn-Boy
Generation II 2-Cycle Ashless Oil will help keep your
engine clean, reduce spark plug fouling, piston ring
sticking and pre-ignition. Lawn-Boy Generation II
2-Cycle Ashless Oil will also minimize varnish build-up,
combustion chamber deposits and exhaust port blockage.
If Lawn-Boy Generation II 2-Cycle Ashless Oil is not
available, other premium grade 2-cycle ashless oils,
certified NMMA TCW III, can be substituted. Substitute
oils may produce more exhaust smoke and may require
increased engine service including more frequent spark
plug changes, exhaust port/cylinder decarbonizing, and
could reduce engine life.

8
IMPORTANT : ONL Y Lawn-Boy r Generation II
2-Cycle Ashless Oil, packaged in purple/gr een cans or
an NMMA TCW III certified oil should be used.
Note: NEVER USE AUT OMOTIVE OIL (i.e. SAE 30,
10W30 etc.), OR THE WRONG MIX RA TIO BECAUSE
ENGINE DAMAGE MA Y OCCUR. If engine failure
occurs and it has been determined that Lawn-Boy
Generation II 2-Cycle Ashless Oil or an NMMA TCW
III certified oil was not used, the failure may not be
covered by the Lawn-Boy warranty .
DANGER
POTENTIAL HAZARD
• In certain conditions gasoline is extr emely
flammable and highly explosive.
WHA T CAN HAPPEN
• A fir e or explosion fr om gasoline can burn you,
others, and cause pr operty damage.
HOW T O A V OID THE HAZARD
• Use a funnel and fill the fuel tank outdoors, in
an open ar ea, when the engine is cold. W ipe up
any gasoline that spills.
• Do not fill the fuel tank completely full. Add
gasoline to the fuel tank until the level is 1/4” to
1/2” (6 mm to 13 mm) below the bottom of the
filler neck. This empty space in the tank allows
gasoline to expand.
• Never smoke when handling gasoline, and stay
away fr om an open flame or wher e gasoline
fumes may be ignited by a spark.
•Stor e gasoline in an appr oved container and
keep it out of the r each of childr en.
•
Never buy mor e than a 30-day supply of
gasoline.
DANGER
POTENTIAL HAZARD
• In certain conditions gasoline is extr emely
flammable and highly explosive.
WHA T CAN HAPPEN
• A fir e or explosion fr om gasoline can burn you,
others, and cause pr operty damage.
HOW T O A V OID THE HAZARD
• Always place gasoline containers on the gr ound
away from your vehicle befor e filling.
• Do not fill gasoline containers inside a vehicle
or on a truck or trailer bed because interior
carpets or plastic truck bed liners may insulate
the container and slow the loss of any static
charge.
•
When practical, r emove gas-power ed
equipment fr om the truck or trailer and r efuel
the equipment with its wheels on the r ound.
•
If this is not possible, then refuel such
equipment on a truck or trailer fr om a portable
container , rather than fr om a gasoline
dispenser nozzle.
• If a gasoline dispenser nozzle must be used,
keep the nozzle in contact with the rim of the
fuel tank or container opening at all times until
fueling is complete.
Mixing Gasoline And Oil
For simplicity and best engine performance, mix 8 ounces
(250 ml) of Lawn-Boy Generation II 2-Cycle Ashless Oil
with two gallons (8 liters) of fresh, unleaded regular
gasoline. Pour one gallon (4 liters) of gasoline into an
approved gasoline container and add the correct amount of
2-cycle oil. Install cap on gasoline container and shake to
mix oil and gasoline thoroughly (Fig. 9). Slowly remove
cap and add remaining gasoline.
1056
Figure 9

9
Note: Do not mix gasoline and oil in the product fuel
tank. Oil that is at room temperature mixes easily and
more thoroughly than cold oil.
Use clean, fresh lead-free gasoline with an octane rating
of 85 or higher . Purchase only the quantity of gasoline that
can be used in 30 days to assure freshness. Use of
lead-free gasoline results in fewer combustion chamber
deposits and longer spark plug life. Leaded gasoline may
be used if lead-free is not available.
Note: NEVER USE METHANOL, GASOLINE
CONT AINING METHANOL, GASOHOL
CONT AINING MORE THAN 10% ETHANOL,
PREMIUM GASOLINE OR WHITE GAS BECAUSE
ENGINE FUEL SYSTEM COULD BE DAMAGED.
1. Clean around fuel cap before removing (Fig. 10). Fill
fuel tank with gasoline/oil mix to within 1/4 inch
(6.5 mm) of top of tank, not into filler neck. DO NOT
OVER-FILL T ANK. Replace fuel cap securely and
wipe up any spilled fuel.
993
Figure 10
Lawn-Boy recommends that Lawn-Boy 2+4 r Fuel
Conditioner (Fig. 1 1) be used regularly during operation
and storage. Lawn-Boy 2+4r Fuel Conditioner cleans the
engine during operation and prevents gum-like varnish
deposits from forming in the engine during storage.
1058
Figure 1 1
DO NOT USE FUEL ADDITIVES OTHER THAN
THOSE MANUF ACTURED FOR FUEL
STABILIZA TION DURING ST ORAGE, SUCH AS
LA WN-BOY 2+4 r FUEL CONDITIONER.
LA WN-BOY DOES NOT RECOMMEND
ST ABILIZERS WITH AN ALCOHOL BASE SUCH
AS ETHANOL OR METHANOL. ST ABILIZERS
SHOULD NOT BE USED T O TR Y T O ENHANCE
THE POWER OR PERFORMANCE OF MACHINE.
2. Connect spark plug wire (if disconnected) (Fig. 12).
m–3833
1
Figure 12
1. Spark plug wire
Lawn Preparation And Mowing
1. Review SAFETY INSTRUCTIONS and read this
manual carefully before operating mower .
2.
Clear area of sticks, stones, wire, branches and other
debris which could be picked up or hit by cutting blade
and become thrown objects.
3. Keep everyone, especially children and pets, away
from area of operation.
4. A void striking trees, walls, curbs or other solid objects.
Never deliberately mow over any object.
5. If an object is struck, or mower starts to vibrate,
immediately stop engine, disconnect spark plug wire
and examine mower for damage.
6. Replace blade when necessary with an original
Lawn-Boy replacement blade.

10
Operation
Starting Engine
Note: Follow steps in BEFORE ST AR TING section.
1. Move throttle lever to position (Fig. 13).
10051
1
Figure 13
1. Throttle lever
2. Push primer three (3) times (Fig. 14). W ait about two
(2) seconds between each push.
Note: Do not use position to restart a warm engine
after a short shutdown.
m–3833
1
Figure
14
1. Primer
3. Hold blade control bail against upper handle (Fig. 16).
4. Start mower .
A.
ELECTRIC ST AR TING (Model 10547)—T urn key
clockwise to ST ART position (Fig. 15).
1352
Figure 15
1. Key
B. MANUAL STAR TING (All models)—Pull starter
handle (Fig. 16) lightly until resistance is felt, then
pull sharply . Let rope return to handle slowly .
1348
1
3
2
Figure 16
1. Blade control bail
2. Upper handle
3. Starter handle
5. If the engine fails to start, repeat steps 2
through 4.
Note: If the engine starts but then begins to stall, move
the throttle lever to the position until the engine
continues to run, then move the throttle back to the
position.
In cool temperatures, it may be necessary to prime
three times with the throttle lever in the position,
and then start the engine. Once the engine has started,
move the throttle lever to the position.
Stopping Engine
1. Move throttle lever to position (Fig. 13).
2. Release blade control bail (Fig. 17). Both the engine
and blade will stop. See your dealer immediately if
they do not.

11
1046
1
Figure
17
1. Blade control bail
3. For model 10547, remove key from switch if mower
will be unattended or not used.
To Restart Engine
1. Repeat STAR TING ENGINE procedure with throttle
lever in position.
Note: T o restart a warm engine, a single prime may be
required, but do not push the primer button any more
than once, or you may flood the engine.
Self-propelled Drive
(self-propelled models only)
1. Move ground speed lever to one (1) of three (3)
ground speeds, 1 – slow , 2 – medium or 3 – fast. Select
a speed that is comfortable to walk and not too fast for
grass length.
Note: Do not change ground speeds with
self-propelled drive engaged. Stop mower , place
ground speed lever in desired position, then continue
mowing.
2.
Move ground speed lever to N – neutral when
trimming or leaving mower .
3. T
o operate self-propelled drive squeeze self-propelled
bail against handle and hold (Fig. 18).
Note: Slight variations in ground speed can be made
by increasing space between self-propelled bail and
handle.
1048
1
Figure
18
1. Self-propelled bail
4. To disengage self-propelled drive, release
self-propelled bail (Fig. 19).
Note: Mower is equipped with free-wheeling clutches
which make it easier to pull the mower rearward. T o
disengage clutches mower may need to be pushed
forward one inch or more after self-propelled bail has
been released.
1047
1
Figure
19
1. Self-propelled bail
Adjusting Cutting Height
Each wheel is adjusted individually with a wheel height
adjustment lever . Cutting heights are 1”, 1–1/2”, 2”,
2–1/2”, 3” and 3–1/2 inches (25, 38, 51, 64, 74 and
86 mm).
DANGER
POTENTIAL HAZARD
• Adjusting height-of-cut levers could bring
hands into contact with moving blade.
WHA T CAN HAPPEN
• Contact with r otating blade can cause serious
injury.
HOW T O A V OID THE HAZARD
• Stop engine and wait for all movement to stop
befor e adjusting cutting height.
• Do not put fingers under housing when
adjusting height-of-cut.
1. T o change cutting height pull wheel height adjustment
lever toward wheel and move to the desired position
(Fig. 20).

12
1131
1
Figure 20
1. Wheel height adjustment lever
2. Release wheel height adjustment lever and seat
securely in notch.
Note: Set all four (4) wheels at the same height.
Mulching T ips
General Tips
Follow these instructions whether cutting grass or leaves
for the best cutting results and lawn appearance:
• Maintain a sharp blade throughout the cutting season.
Periodically file down nicks on blade.
• Only mow dry grass or leaves. W et grass and leaves
tend to clump on yard and may cause mower to plug or
engine to stall. They may also be slippery to walk on
and could cause you to slip and fall.
WARNING
POTENTIAL HAZARD
•W et grass or leaves can cause you to slip and
contact blade.
WHA T CAN HAPPEN
• Blade contact can seriously injure you.
HOW T O A V OID THE HAZARD
• Mow only in dry conditions.
• Set engine speed to fastest position. Maximum
horsepower provides best cutting results.
• Clean clippings or leaves from underside of mower
deck after each mowing.
• Keep engine in good running condition. Cutting and
recutting requires more horsepower .
•
Clean air filter more frequently . Cutting and recutting
stirs up more clippings and dust which clogs the air
filter and reduces engine performance.
Cutting Grass
•Grass grows at dif ferent rates at dif ferent times of the
year . In the heat of summer , it is generally best to cut
grass at the 2, 2.5 or 3 inch height-of-cut settings. Only
about !/3 of the grass blade should be cut of f. Cutting
below the 2 inch setting is not recommended unless
grass is sparse or it is late fall when grass growth
begins to slow down.
• When cutting grass over six inches tall, you may want
to first mow using the highest height-of-cut setting and
a slower walking speed; then mow again at a lower
setting for best lawn appearance. If grass is too long
and leaves clumps on top of lawn, mower may plug
and cause engine to stall.
• Alternate mowing direction. This helps disperse
clippings over lawn for even fertilization.
If the finished cut lawn appearance is unsatisfactory , try
one or more of the following:
• Sharpen the blade.
•W alk at a slower pace while mowing.
• Raise the height-of-cut setting on your mower .
•
Cut grass more frequently .
•
Overlap cutting swaths instead of cutting a full swath
with each pass.
Cutting Leaves
•When cutting is complete, always be sure that 50% of
the lawn shows through the cut leaf cover . This may
require one or more passes over the leaves.
•W alk at a slower mowing speed if leaves are not being
cut up finely enough to be hidden down in the grass.
• If you cut up a lot of oak leaves, you might want to
add lime to your grass in the spring. Lime reduces the
acidity of oak leaves.

13
Maintenance
NOTICE: Maintenance, r eplacement, or r epair of the emission contr ol devices and systems may be performed by
any nonr oad engine r epair establishment or individual. However , to obtain no charge r epairs under the terms and
pr ovisions of the T or o warranty statement, any service or emission contr ol part r epair or r eplacement must be
performed by an Authorized T or o Service Dealer .
Continued safe and dependable operation requires routine maintenance.
Recommended Maintenance Schedule
Service Item Service Operation
After
every
use 5
Hours 25 Hours 48 Hours 50 Hours 100 Hours
Housing Clean built-up grass clippings and dirt. X
Fasteners
Check blade and engine mounting
fasteners frequently . Keep all nuts, bolts
and screws tight to ensure safe
operation.
X
Air Filter
Remove and clean each mowing
season or every 50 hours. Clean more
frequently if operating conditions are
dusty.
X
Spark Plug
Clean, inspect and gap. Replace if
necessary. X
Lubrication Grease rear height adjusters X
Battery (Model
10547)
Charge battery for 48 hours once every
month or as required. Charge for 72
hours when mower is stored and in the
spring before first mowing.
X
Blade
Sharpen or replace; maintain more
frequently if edge is dulled quickly in
rough or sandy conditions.
X
Blade Brake
Check stopping time every 50 hours or
at start of each mowing season. Blade
must stop within 3 seconds of releasing
bail; if not see your Authorized
Lawn-Boy Service Dealer for repair .
X
Exhaust Ports Clean every 100 hours. X
Fuel System
Check for leakage and/or deterioration
of fuel hose. Replace if necessary .X
Cooling System
Clean grass clippings, debris or dirt that
clog engine air cooling fins and starter .
Clean more frequently under dirty or
high chaf f conditions.
X

14
CAUTION
POTENTIAL HAZARD
• If you leave the wir e on the spark plug, someone could start the engine.
WHA T CAN HAPPEN
• Accidental starting of engine could seriously injur e you or other bystanders.
HOW T O A V OID THE HAZARD
• Pull the wir e off of the spark plug befor e you do any maintenance. Also push the wir e aside
so that it does not accidentally contact the spark plug.
Air Filter
Clean air filter once every season or every 50 hours; clean
mor
e fr equently under dusty conditions.
Note: Do not operate engine without air filter element;
extreme engine wear or damage will occur .
1. T
o remove air filter , snap cover latch open and swing
to side (Fig. 21).
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎ
m–3834
1
2
Figure
21
1. Filter 2. Cover
2. Remove air filter .
3. W
ash air filter in laundry deter gent or kerosene
(Fig. 22).
4. Squeeze filter to remove excess liquid and blot dry
with a paper towel or rag.
988
Figure 22
5. Apply one tablespoon of SAE 30W oil to the air filter
(Fig. 23).
989
Figure 23
6. Squeeze until oil is distributed evenly throughout
filter . Blot lightly with paper towel to remove excess
oil.
7.
Replace filter with cleaner side facing carburetor .
Note:
Be sure filter is fully seated in air box and does
not pucker , allowing direct passage of air and dirt.
Spark Plug
A spark plug that is dirty , pitted, carbon-covered or has
worn electrodes may cause hard starting and poor
operation.

15
Replace spark plug once a season or clean every 50 hours,
whichever occurs first. Use an NGK BPMR4A spark
plug.
1.
Pull wire of f spark plug (Fig. 25). Remove key from
switch.
2.
Remove spark plug and clean with a wire brush,
removing carbon build-up. DO NOT SAND BLAST .
Check condition of plug for cracks and damaged or
worn electrodes. Replace if necessary .
3.
Set spark plug gap at .035 inch (.85 mm) (Fig. 24).
986
.035 in.
(.85 mm)
Figure 24
4. Install spark plug by hand, then torque to 180 in.–lbs.
(15 ft.–lbs.) (20 N m).
5.
Reconnect spark plug wire when maintenance is
completed (Fig. 25).
m–3833
1
Figure 25
1. Spark plug wire
Clean Mower Housing
A clean mower housing provides the best cutting
performance. Check for grass build-up and clean after
each use.
1. Run engine dry or remove gas with hand pump when
the engine is cool.
WARNING
POTENTIAL HAZARD
• Gasoline is extr emely flammable, highly
explosive and under certain conditions can
cause personal injury or pr operty damage.
WHA T CAN HAPPEN
•T ipping mower may cause fuel leakage fr om
carbur
etor or fuel tank.
HOW T O A V OID THE HAZARD
•A void fuel spills by running engine dry or
r emove gas with hand pump, never siphon.
2. Disconnect spark plug wire (Fig. 25).
3. T ip mower onto right side (Fig. 26).
1036
Figure 26
4. Scrape built-up grass clippings and dirt from mower
housing with a hardwood scraper .
5.
Reconnect spark plug wire when maintenance is
completed.
Blade
A straight, sharp blade provides maximum cutting
performance. Regularly inspect and sharpen blade.
WARNING
POTENTIAL HAZARD
• Blade is sharp.
WHA T CAN HAPPEN
• Contact with sharp blade can cause serious
personal injury .
HOW T O A V OID THE HAZARD
•W ear gloves or wrap sharp edges of the blade
with a rag.

16
Blade Straightness
1. Disconnect spark plug wire (Fig. 25).
2. Measure the distance from the bottom edge of the
mower housing to the blade tip (Fig. 27). Rotate the
blade 180 ° and measure to other blade tip.
Note: If measurements are not within 1/8 inch
(3.2 mm), blade should be replaced. If, after blade
replacement, the measurements are still not within
1/8 inch (3.2 mm), the crankshaft should be checked
for straightness by your Authorized Lawn-Boy Service
Dealer.
1005
Figure 27
Blade Removal
1. Remove blade nut and mulching fan (Fig. 28).
1022
1
2
4
3
Figure
28
1. Blade nut
2. Mulching fan
3. Blade
4.
Blade driver
2. Remove blade from blade driver (Fig. 28).
3. Examine blade cutting edges for nicks, cutting angle
and sharpness. Sharpen or replace if necessary .
4.
Examine mulch fan for worn or bent blades. Replace if
necessary.
5.
Examine blade driver for bent or sheared drive lugs.
Replace if necessary .
Blade Sharpening
WARNING
POTENTIAL HAZARD
• When sharpening blade, pieces of blade could
be accidentally thr own.
WHA
T CAN HAPPEN
•Thr own objects can cause serious eye injury .
HOW T O A V OID THE HAZARD
•W ear pr oper eye pr otection when sharpening
blade.
1. Sharpen only the leading edge of blade with a file or
grinder . Do not sharpen beyond the recommended
area.

17
Note: Blade should not be ground more than 5 inches
(127 mm) from outside ends and no less than 2 inches
(51 mm) from trailing edge (Fig. 29).
990
2”
(51 mm)
5”
(127 mm)
Figure 29
Blade Balancing
1. Check the balance of blade by placing the center hole
of blade over a nail or screwdriver shank clamped
horizontally in a vise (Fig. 30).
2. If either end of blade rotates downward, grind or file
that end (not the cutting edge). Blade is properly
balanced when neither end drops.
1007
Figure 30
Blade Installation
1. Install blade driver onto crankshaft (if removed)
(Fig. 28).
2. Locate blade over lugs of blade driver with curved
ends toward mower housing.
3. Install mulch fan into blade recess and secure with
blade nut (Fig. 31).
1024
Figure 31
4. Torque blade nut to 560 in.–lbs. (47 ft.–lbs.) (63 N m).
Note:
Blade nut must be replaced after installing and
removing four (4) times. Locking feature will decrease
and nut could loosen if not replaced.
5. Connect spark plug wire when maintenance is
completed (Fig. 25).
Lubrication
Rear Height Adjusters
(self-propelled models only)
1. W ipe grease fittings on rear height-of-cut adjusters
(Fig. 32) with a clean rag.
2. Install grease gun onto fitting and gently apply 1 or 2
pumps of #2 multi-purpose lithium grease. Excess
grease may damage seals and prevent proper wheel
clutch operation.

18
1018
1
Figure
32
1. Grease fitting
Self-propelled Cable
(self-propelled models only)
Whenever handle height is changed, a new self-propelled
cable is installed or traction drive belt slips, adjustment is
required.
Self-propelled cable is adjusted at the left handle bracket
by moving cable jacket held by jam nuts.
1. Hold self-propelled bail 1 to 1 !/2 in. (25 to 38 mm)
from handle (Fig. 33).
1131
2
1
2
Figure
33
1. Cable jacket 2. Jam nut
2. Adjust jam nuts, at handle bracket, so cable is tight,
but spring is not stretched.
3. T ighten jam nuts securely .
4.
Release bail and check to see that cable is loose.
Note: Cable must be loose with bail in released
position or mower may creep when bail is disengaged.
Exhaust Ports
Carbon deposit build-up causes excessive wear and loss of
power . Check and clean them every 100 hours.
1. Remove spark plug. See SP ARK PLUG section.
2. Drain gasoline using a hand pump.
3. T ip mower on its right side.
WARNING
POTENTIAL HAZARD
• Gasoline is extr emely flammable, highly
explosive and under certain conditions can
cause personal injury or pr operty damage.
WHA T CAN HAPPEN
•T ipping mower may cause fuel leakage fr om
carbur
etor or fuel tank.
HOW T O A V OID THE HAZARD
•A void fuel spills by running engine dry or
r emove gas with hand pump, never siphon.
4. Remove blade nut, mulch fan and blade. See BLADE
REMOV AL section.
5. Remove blade driver by tapping with plastic or fiber
hammer in the direction of rotation (Fig. 34). This will
loosen the blade driver from taper on crankshaft.
m–3835
1
Figure
34
1. Blade driver
6. Remove (4) capscrews attaching cover plate to engine
mounting plate (Fig. 35).
7. Remove transfer pipe (Fig. 35).

19
m–3836
1
3
2
4
5
Figure
35
1. Cover plate
2. Cap screw
3. T ransfer pipe
4. Exhaust port
5. High temperature silicone
sealant
8. Rotate crankshaft slowly until piston covers exhaust
port (Fig. 35).
9. Using a wooden dowel, loosen carbon deposits by
inserting dowel into port.
Note: Do not use metal tools; they could scratch
piston.
10.
Set mower upright.
11. Hold blade control bail against upper handle (Fig. 36)
and pull starter rope several times to blow out loose
carbon.
1348
1
3
2
Figure 36
1. Blade control bail
2. Upper handle
3. Starter handle
12.Run a bead of high temperature, automotive silicone
sealant along the edge of the engine mounting plate
where the cover plate will rest (Fig. 35).
13. Reinstall transfer pipe and cover plate (Fig. 35),
torquing the (4) capscrews to 75 in lbs (8.5 N·m).
14. Attach blade driver , blade and mulch fan with blade
nut. See BLADE INST ALLATION.
15.T
orque blade nut to 560 in.–lbs. (47 ft.–Ibs.) (63 Nm).
16.T ip mower upright.
17. Reconnect spark plug wire when maintenance is
completed.
18.
Fill fuel tank with clean, fresh gasoline.
Battery (Model 10547)
Charging Battery
A new battery must be char ged for 72 continuous hours to
ensure a full char ge. Also, char ge battery for 72 hours
when mower is stored for a long period of time and in the
spring before first mowing. Char ge battery for 48 hours
once every month or as required. DO NOT
OVERCHARGE. The engine is equipped with an
alternator which char ges the battery during operation.
Char ging is not needed after each mowing.
1. Stop engine and pull wire of f spark plug (Fig. 25).
Remove key from switch.
2. Disconnect leads connecting starter motor to battery
(Fig. 37).
1353
1
Figure
37
1. Leads
3. Connect charger supplied with your mower to battery
and plug into 120V AC power outlet. After char ging
battery for specified time, unplug char ger and
disconnect from battery .
IMPORTANT
: Only the Lawn-Boy charger is
r ecommended because other chargers could
damage the battery . Always use charger indoors
and charge battery at r oom temperatur e (22 _ C or
+70_ F) whenever possible. Do not charge battery
longer than 72 hours because damage could r esult.
Note:
Disconnect battery from char ger and mower
during storage.

20
4. Reconnect leads from starter motor to battery .
5.
Reconnect spark plug wire.
Disposing of Battery
DO NOT PLACE USED BA TTERIES IN YOUR
REGULAR TRASH!
THIS SEALED LEAD (ACID) BA TTER Y MUST BE
COLLECTED, RECYCLED OR DISPOSED OF IN
AN ENVIRONMENT ALL Y SOUND MANNER.
The incineration, landfilling or mixing of sealed lead
(acid) batteries with the municipal solid waste stream is
PROHIBITED BY LA W in some areas.
Return this battery to a federal or state approved sealed
lead (acid) battery recycler . This may be where you
purchased the battery .
Contact your local waste management of ficials for other
information regarding the environmentally sound
collection, recycling and disposal of this battery .
Troubleshooting
Y our mower was designed and built for trouble-free operation. Check the following components and items carefully . If a
problem continues, see your Authorized Lawn-Boy Service Dealer .
PROBLEM CORRECTIVE
ACTION
Engine will not start
1. Fill fuel tank with fresh gasoline/oil mix
g
2. Move throttle lever to the F AST position
3. Press primer three (3) times
4. Spark plug
• Connect spark plug wire
• Clean spark plug, check spark plug gap, replace if
damaged
•
Charge battery (model 10547)
Engine starts hard or loses power
1. Move the throttle lever to the F AST position.
2. Drain and refill fuel tank with fresh gasoline/oil mix
3. Clean gas cap vent hole
4. Clean or replace air filter element
5. Clean mower discharge chute
6. Clean underside of mower deck
7. Clean spark plug, check spark plug gap, replace if
damaged
Engine runs rough
1. Connect spark plug wire
gg
2. Clean spark plug, check spark plug gap, replace if
damaged
3. Move throttle lever to the F AST position
4. Clean or replace air filter element