Page 1
Walk Behind Lawn Mower
H
S
L
Owner/Operator Manual
Models
911086 - LM21
911087 - LM21S
ENGLIS
FRANÇAI
ESPAÑO
Transfer
model &
serial number
label from
product
registration
here.
Coller l’autocollant du
modèle et du numéro de
série dans cet encadré.
Transferir aquí la etiqueta
del modelo y número de
serie del registro del
producto.
01198200A 2/04
Supersedes 01198200
Printed in USA
Page 2
11
10
2
12
ENGLISH
1. Engine Control
2. Speed Control Rod (Selfpropelled)
3. Primer
4. Side Discharge Cover
5. Side Discharge Deflector
6. Cutting Height Levers
(2 Rear Wheel Adjusters,
2 Front Wheel Adjusters)
7. Rear Door
8. Adjustable and Folding
Handlebars
9. Grass Bag
10. Recoil Starter Handle
11. Wheel Drive Control
(Self-Propelled)
12. Mulchmaster™ Plug
13. Handlebar Adjustment
Holes
8
13
6
5
CONTROLS AND FEATURES
13. Trous de réglage du
1
9
7
4
3
Figure 1
FRANÇAIS
1. Commande moteur
2. Tige de command de
vitesse (auto-tracté)
3. Poire d’amorçage
4. Plaque d’évacuation
latérale
5. Déflecteur latéral
d’évacuation
6. Leviers de hauteur de
coupe (réglage par
les roues)
7. Trappe arrière
8. Guidon réglable et pliable
9. Sac à herbe
10. Poignée du démarreur
manuel
11. Commande de
l’entraînement des roues
(tondeuses autotractées)
12. Déflecteur à paillis
Mulchmaster™
6
OM1410
ESPAÑOL
1. Control del motor
2. Varilla de control de
3. Cebador
4. Cubierta de la descarga
5. Deflector de la descarga
6. Palancas de la altura de
7. Puerta trasera
8. Manillares ajustables y
9. Bolsa de recolección del
10. Manilla de arranque de
11. Control de la transmisión
12. Tapón Mulchmaster™
13. Agujeros para el ajuste
guidon
velocidad
lateral
lateral
corte (ajustadores de la
rueda)
plegables
césped
retroceso
de la rueda
(autopropulsión)
del manillar
3
Page 3
TABLE OF CONTENTS
Controls and Features . . . . . . . . . . . . . 3
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Assembly . . . . . . . . . . . . . . . . . . . . . . . . 9
Operation. . . . . . . . . . . . . . . . . . . . . . . 10
Maintenance . . . . . . . . . . . . . . . . . . . . 13
Service and Adjustment s. . . . . . . . . . 15
INTRODUCTION
Storage. . . . . . . . . . . . . . . . . . . . . . . . . 18
Troubleshooting . . . . . . . . . . . . . . . . . 19
Service Par ts . . . . . . . . . . . . . . . . . . . . 20
Accessories. . . . . . . . . . . . . . . . . . . . . 20
Specifications . . . . . . . . . . . . . . . . . . . 21
Warranty. . . . . . . . . . . . . . . . . . . . . . . . 22
THE MANUAL
Before using the unit, carefully and completely
read your manuals. The contents will give you
an understanding of safety instructions and
controls during normal operation and
maintenance.
All reference to left, right, front, or rear are
given from the operator’s position, facing the
direction of forward travel.
SERVICE AND REPLACEMENT
PARTS
When ordering replacement parts or making
service inquiries, know the Model and Serial
numbers of your unit and engine.
Numbers are located on the product
registration form in the unit literature package.
They are also printed on a serial number label,
located on the frame of your unit (Figure 2).
Serial Number
Label
Figure 2
• Record Unit Model and Serial numbers here
• Record Engine Model & Serial numbers here
OM1210
PRODUCT REGISTRATION
The Ariens dealer must register the product at
the time of purchase. Registering the product
will help the company process warranty claims
or contact you with the latest service
information. All claims meeting requirements
during the limited warranty period will be
honored, whether or not the product
registration card is returned. Keep a proof of
purchase if you do not register your unit.
Customer Note: If the Dealer does not
register your product, please fill out, sign and
return the product registration card to Ariens
or go to www.ariens.com on the internet.
UNAUTHORIZED REPLACEMENT
PARTS
Use only Ariens replacement parts. Replacing
any part on this vehicle with anything other
than an Ariens authorized replacement part
may adversely affect the performance,
durability, or safety of this unit and may void
the warranty. Ariens disclaims liability for any
claims or damages, whether warranty,
property damage, personal injury or death
arising out of the use of unauthorized
replacement parts. To locate your nearest
Ariens Dealer, call 1-800-678-5443 or go to
www.ariens.com on the internet.
DEALER DELIVERY
Dealer should:
1. Check that all assembly and adjustments
have been properly completed.
2. Fill out Original Purchaser Registration
Card and return the card to Ariens.
3. Explain Ariens Limited Warranty Policy.
4. Explain recommended lubrication and
maintenance. Advise customer on
adjustments. Remind customer to
change oil in 4 cycle engine crankcase
after first two (2) hours of operation.
GB - 4
Page 4
5. Instruct customer on controls and
operation of unit. Discuss and emphasize
the Safety Rules. Give customer
Owner/Operator, Parts, and Engine
manuals. Advise customer to thoroughly
read and understand them.
DISCLAIMER
Ariens reserves the right to discontinue, make
changes to, and add improvements upon its
products at any time without public notice or
obligation.The descriptions and specifications
contained in this manual were in effect at
printing. Equipment described within this
manual may be optional. Some illustrations
may not apply to your unit.
SAFETY
WARNING: This cutting machine
is capable of amputating hands
and feet and throwing objects.
Failure to observe the safety
instructions in the manuals and
on decals could result in serious
injury or death.
Slopes are a major factor related
to slip and fall accidents.
Operation on all slopes requires
extra caution.
Tragic accidents can occur if the
operator is not alert to the
presence of children. Never
assume that children will remain
where you last saw them.
Gasoline is extremely flammable
and the vapors are explosive,
handle with care.
Stop unit and engine and allow
moving parts to stop before
leaving operator’s position.
SAFETY ALERTS
Look for these symbols to point out
important safety precautions. They
mean:
Attention!
Personal Safety Is Involved!
Become Alert!
Obey The Message!
The safety alert symbols above and signal
words below are used on decals and in this
manual.
Read and understand all safety messages.
WARNING: POTENTIALLY
HAZARDOUS SITUATION! If not
avoided, COULD RESULT in death
or serious injury.
CAUTION: POTENTIALLY
HAZARDOUS SITUATION! If not
avoided, MAY RESULT in minor or
moderate injury. It may also be used
to alert against unsafe practices.
NOTATIONS
NOTE: General reference information for
proper operation and maintenance practices.
IMPORTANT: Specific procedures or
information required to prevent damage to unit
or attachment.
PRACTICES AND LAWS
Practice usual and customary safe working
precautions, for the benefit of yourself and
others. Understand and follow all safety
messages. Be alert to unsafe conditions and
the possibility of minor, moderate, or serious
injury or death. Learn applicable rules and
laws in your area.
REQUIRED OPERATOR TRAINING
Original purchaser of this unit was instructed
by the seller on safe and proper operation. If
anyone other than the original purchaser will
use the unit, ALW A YS provide this manual and
any needed safety training before operation.
DANGER: IMMINENTLY
HAZARDOUS SITUATION! If not
avoided, WILL RESULT in death or
serious injury.
GB - 5
Page 5
SAFETY DECALS AND
LOCATIONS
ALWAYS replace missing or damaged safety
decals. Refer to Figure 3 for safety decal
locations.
CAUTION
PRECAUCION
ATTENTION
08088300
Figure 3
Leer el manual del operador.
Mantenga la unidad alejada de los niños u otras personas
cuando esté en funcionamiento.
Nunca dirija la descarga hacia otras personas, a que los objetos
lanzados pueden provocar lesiones.
No poner en funcionamiento la máquina a menos que las
guardas estén en posición de funcionamiento o la embolsadora
entera esté conectada.
Mantenga artefactos de seguridad (defensas, protectores,
interruptores, etc.) en su lugar y trabajando.
Transversa pendientes, no subir ni bajar.
Mire hacia abajo y detras antes y durante retroceso.
07742400B
OM1420
1. DANGER
TO AVOID SERIOUS INJURY OR DEATH
Read the operator’s manual.
OL1801
Keep children and others away
from unit while operating.
OL4370
Never direct discharge toward
other people. Thrown objects can
cause injury.
OL0910
Do not operate mower unless
guards are in operating position or
entire bagger is attached.
OL4540
Keep safety devices (guards,
shields, switches, etc.) in place
and working.
OL3030
• Go across slopes, not up and down.
• Look down and behind before and
while moving backward.
2. DANGER
KEEP HANDS AND FEET AWAY
Do not operate mower unless guards are in
operating position or bagger is attached.
3. CAUTION!
• Bag is subject to wear and
deterioration.
• Check bag frequently, replace when
necessary.
• Use original bag to comply with safety
specifications.
GB - 6
Page 6
SAFETY RULES
If unit is to be used by someone other than
original purchaser; loaned, rented or sold,
ALW AYS provide this manual and any needed
safety training before operation.
Read, understand and follow all safety
practices in Owner/Operator Manual before
beginning assembly. Failure to follow
instructions could result in personal injury
and/or damage to unit.
ALWAYS disconnect wire from spark plug
before assembly. Unintentional engine st art up
can cause death or serious injury.
Complete a walk around inspection of unit and
work area to understand:
• work area
• your unit
• all safety decals.
Clear work area of stones, sticks, wire and
foreign objects which might be picked up and
thrown. Tall grass can hide obstacles.
Know the work area. Stay alert for holes,
rocks, rough terrain and hidden hazards.
Keep away from drop-offs, ditches, or
embankments that could cause operator to
lose footing or control of unit.
ALWAYS be aware of traffic when operating
along streets or curbs.
Keep work area clear of all persons, children
and pets.
Keep children out of the work area and under
the watchful care of a responsible adult.
ALWAYS operate unit when there is good
visibility and light.
DO NOT mow wet grass.
ALWAYS be sure of your footing. Keep a firm
hold on handlebar. Walk, NEVER run.
Engine/blade control feature on mower stops
engine and blade within 3 seconds whenever
operator releases handlebar. Check this
feature frequently. If feature fails to operate,
disconnect spark plug wire and adjust or have
it repaired before using unit.
Only trained adults may operate unit. Training
includes actual operation.
NEVER operate after or during the use of
medication, drugs or alcohol. Unit requires
complete and unimpaired attention.
NEVER allow children to use mower.
ALWAYS keep hands and feet away from
rotating parts. Rotating parts can cut off body
parts.
ALWAYS keep hands away from pinch points.
Fumes from engine exhaust can cause death
or serious injury. DO NOT run engine in an
enclosed area.
ALWAYS protect eyes, face, and body with
adequate safety gear and protective clothes.
Wear sturdy footwear, gloves and safety
goggles or safety glasses with side shields
while operating mower.
NEVER operate mower barefoot or when
wearing open sandals or canvas shoes.
NEVER wear loose clothes, long hair or
jewelry that may get caught in rotating parts.
ALWAYS stand clear of discharge when
operating unit.
NEVER direct discharge toward bystanders.
Operator is responsible for bystander safety.
DO NOT touch hot parts. Allow parts to cool.
Keep safety devices or guards in place and
functioning properly. NEVER modify or
remove safety devices.
Read, understand, and follow all instructions
in the manual and on the machine before
starting.
Understand:
• How to operate all controls
• The functions of all controls
• How to STOP in an emergency.
DO NOT attempt to start your engine until you
know what the controls do and how they work.
DO NOT tilt mower when starting it.
Keep feet away when starting engine.
DO NOT start the engine or operate mower
without side discharge cover or side discharge
deflector installed.
Take all possible precautions when leaving
unit unattended.
ALW A YS shut off engine and disconnect spark
plug wire to prevent accidental starting or
unauthorized use.
Stop engine if anyone enters the work area.
NEVER attempt to make any adjustments to
unit while engine is running (except where
specifically recommended). Stop engine and
wait for all moving parts to stop before
servicing.
DO NOT make cutting height wheel
adjustments while the engine is running.
If you strike an object, or if equipment vibrates
abnormally, stop engine at once, wait for
moving parts to stop and disconnect wire from
spark plug. Repair any damage before
restarting unit.
Keep rear door closed when engine is running
unless the grass bag is in place.
GB - 7
Page 7
Stop engine before removing and emptying
grass bag.
When mulching or bagging, ALWAYS install
discharge cover.
When side discharging, ALWAYS install side
discharge deflector.
ALWAYS shut off engine, allow blade to stop
and disconnect spark plug wire before clearing
clogs or cleaning unit.
Check grass bag for wear, damage, and/or
deterioration. Replace only with Ariens
original equipment replacement parts for
safety.
To reduce fire hazard and overheating, keep
equipment free of grass, leaves, debris or
excessive lubricants.
Use extra care when approaching blind
corners, shrubs, trees, or other objects which
may obscure vision.
DO NOT mow at too fast a rate. DO NOT
change engine governor setting or over-speed
the engine.
Do not operate mower on gravel or loose
material such as sand. Stop mower when
crossing drives, walks, or roads to prevent
damage or injury from thrown objects.
DO NOT pull mower backwards unless
absolutely necessary. Look down and back,
especially for small children, before and while
moving backwards.
On self-propelled models, releasing wheel
drive control must stop mower’s forward
movement. If this feature fails to operate,
disconnect spark plug wire and repair before
using unit.
On self-propelled models, wheel drive must be
disengaged when starting engine.
DO NOT operate on steep slopes.
NEVER leave unit unattended on a slope.
Chock wheels if parking on a slope.
Mow across the face of slopes, never up and
down. Be especially cautious when changing
direction on slopes.
This product is equipped with an internal
combustion engine. DO NOT use on or near
any unimproved, forest or brush covered land
unless the exhaust system is equipped with a
spark arrestor meeting applicable local, state
or federal laws. A spark arrestor, if used, must
be maintained in effective working order by the
operator. See your Ariens Dealer or engine
manufacturer’s service center.
Fuel is highly flammable and its vapors can
explode. ONLY use approved fuel containers.
• NO Smoking!
• NO Sparks!
• NO Flames!
• Allow engine to cool before filling fuel
tank.
Never fill containers inside a vehicle or on a
truck or trailer bed with a plastic liner. Always
place containers on the ground away from
your vehicle before filling.
When practical, remove gas-powered
equipment from the truck or trailer and refuel it
on the ground. If this is not possible, then
refuel such equipment on a trailer with a
portable container, rather than from a gasoline
dispenser nozzle.
Keep the nozzle in contact with the rim of the
fuel tank or container opening at all times until
fueling is complete. Do not use a nozzle lockopen device.
Check fuel supply before starting engine.
DO NOT fill gasoline tank indoors, when
engine is running, or while engine is hot.
Allow engine to cool several minutes before
removing fuel cap.
DO NOT overfill. Allow about 1/4" (6 mm) of
tank space for fuel expansion.
Replace gasoline tank cap securely and clean
any spilled fuel before starting engine.
If fuel is spilled on clothing, change clothing
immediately.
NEVER store fuel inside where there is an
open flame, such as a water heater.
ALWAYS drain fuel outdoors away from
ignition sources.
ALWAYS shut off engine when transporting
unit on a truck or trailer.
Avoid Electric Shock. DO NOT disconnect
wire from spark plug while engine is running.
Accidental engine start up can cause death or
serious injury. Except where specifically
recommended, ALWAYS stop engine, wait for
moving parts to stop, allow parts to cool and
disconnect spark plug wire before inspecting,
servicing, adjusting or repairing unit.
Keep mower free of grass, leaves, or other
debris build-up.
Keep equipment in good condition.
Maintain or replace safety and instruction
labels, as necessary.
Follow engine manufacturer’s safety
instruction when servicing engine.
Check all hardware at regular intervals,
especially blade attachment bolts. Keep all
hardware properly tightened.
Before tipping unit, remove fuel.
Ensure all wheel blocks, jack stands and tie
downs will support unit during maintenance.
GB - 8
Page 8
Replace worn-out mufflers immediately.
Continued use could result in fire or explosion.
Sharp edges can cut or amputate fingers or a
hand. Wrap blade or wear sturdy gloves to
service.
Use only replacement parts designed for your
unit. See your Ariens Dealer.
Allow engine to cool before storing in any
enclosure.
ASSEMBLY
CAUTION: AAVOID INJURY. Read
and understand the entire Safety
section before proceeding.
CARTON CONTENTS
ALWAYS clean unit before extended storage.
See engine manual for proper storage.
DO NOT store unit inside a building with fuel in
the fuel tank where any ignition sources are
present.
Use only accessories which have been
approved by Ariens and are properly installed.
Check attachments frequently and replace
worn or damaged components with
manufacturer’s recommended parts.
1
OM1222
1. Mower Unit
2. Side Discharge Deflector
3. Grass Bag
4. Grass Bag Frame
5. Literature Pack
ASSEMBLY
1. Unfold and adjust handlebar. See Service
and Adjustments.
2. Self-Propelled Models: The speed control
rod is shipped on the handlebar with
hardware in position. Remove hair pin,
insert bent end of rod through hole in
swivel of speed control bell crank, and
retain with hair pin (Figure 5).
3. Fill engine crankcase with oil. See engine
manual.
4. Assemble grass bag onto bag frame.
Figure 4
2
OM0340
3
5
OM0320
OM0350
4
OM0330
5. Set-up mower for bagging, side
discharge or mulching. See Mower Set-
Up in Operation Section.
6. Fill fuel tank. See Operation Section.
7. Check the engine/blade control feature.
Try starting the engine without the
engine/blade control held against the
handlebar. Engine must not start. If
engine starts, stop engine and adjust or
repair engine/blade control. See Service
and Adjustments.
GB - 9
Page 9
1
3
2
1. Speed Control Rod
2. Hair Pin
3. Speed Control Bell Crank
Figure 5
OM0300
OPERATION
CONTROLS AND FEATURES
See Figure 1 for locations.
WARNING: Improper operation can
lead to injury. Learn what the
controls do and how they work.
Thoroughly read and understand
entire Operator Manual.
CAUTION: AVOID INJURY. Read
and understand the entire Safety
section before proceeding.
Engine/Blade Control
CAUTION: Check function of
Engine/Blade Control regularly.
Improper function of control could
cause injury.
The engine/blade control must be held against
the handlebar to start the engine and blade.
Releasing the control during operation stops
the engine and blade.
Handlebar
Adjust handlebar to a safe and comfortable
height. Refer to Service and Adjustments for
instructions.
Recoil Starter Handle
When pulled, handle will turn engine over.
CUTTING HEIGHT ADJUSTMENT
DANGER: Avoid injury from rotating
blade.
ALWAYS shut off engine before
adjusting cutting height.
CAUTION: On self-propelled
models, both rear wheels must be
set at same height or traction drive
may not work properly.
Standard Models
To change cutting height, move cutting height
levers one notch at a time on each wheel to
set desired height (Figure 6).
NOTE: Each wheel on mower must be set at
the same height for a level cut.
STOP START and RUN
OM1230
GB - 10
Page 10
LowHigh
HighLow
1
1
Rear Front
1. Cutting Height Lever
Cutting Height Settings Chart
Notch Cut grass length
LOW 1" (25 mm)
2 1-3/8" (35 mm)
3 1-3/4" (45 mm)
4 2-1/4" (57 mm)
5 2-3/4" (70 mm)
HIGH 3-1/4" (83 mm)
OPTIONAL CONTROLS
Primer Bulb
Push the primer bulb in to add fuel for easier
engine start.
Speed Control
(self-propelled models)
Speed control rod changes the mower’s
forward travel speeds.
High –Push lever all the way
forward.
Figure 6
Speed control rod should hold the desired
speed. If not, adjust speed control bell crank
(See Service and Adjustments).
WHEEL DRIVE CONTROL (selfpropelled models)
CAUTION: Unit will move forward at
engine start if wheel drive control is
engaged. ALWAYS release wheel
drive control before starting unit.
NOTE: Engine must be running for wheel
drive to propel unit.
To drive forward:
Slowly squeeze and hold wheel drive control
against handlebar.
To stop:
Release wheel drive control.
OM0165
OM0480
Low –Pull lever all the way
rearward.
Start mowing slowly and use speed control rod
to gradually increase speed to a safe,
comfortable walking pace.
STOP GO
OM1240
GB - 11
Page 11
FILLING FUEL TANK
CAUTION: AVOID INJURY. Read
and understand the entire Safety
section before proceeding.
To add fuel to fuel tank:
1. Put unit in open or well-ventilated area.
2. Stop engine and allow to cool.
3. Clean fuel cap and surrounding area.
4. Remove cap.
IMPORTANT: See engine manual for correct
type and grade of fuel.
5. Fill fuel tank. (See Specifications for tank
capacity.)
6. Replace fuel cap and tighten.
7. ALWAYS clean any spilled fuel.
MOWER SET-UP
CAUTION: DO NOT operate mower
unless either side discharge cover
or side discharge deflector is
installed. Thrown objects may
cause damage or injury. Never
operate unit with rear door open
unless grass bag is in place.
CAUTION: If clog or obstruction
prevents grass flow, release
engine/blade control and disconnect
spark plug wire before attempting to
clear away any clogs.
To Bag
CAUTION: Check grass bag
frequently for wear or deterioration.
Replace worn or damaged bag with
Ariens original equipment
replacement bag only.
1. Shut off unit.
2. Install side discharge cover.
3. Lift rear door.
4. Hook grass bag frame on mounting
flange.
5. Lower rear door.
If necessary, lift rear of grass bag frame to lock
in position.
There should be no openings between bag
and mounting surface after installing bag. If
necessary clear debris from bag mounting
surface.
Grass Bag Removal
1. Shut off unit.
2. Lift rear door.
3. Use handle to lift bag off mounting flange.
4. Close rear door.
NOTE: Empty grass bag and clean mower
pan after each use. DO NOT allow grass
clumps or a grass coating to collect inside of
grass bag or mower pan. Remove grass bag
from mower, wash bag with hose and allow to
dry.
To Side Discharge
1. Shut off unit.
2. Install Mulchmaster plug (see below).
3. Remove grass bag.
4. Remove side discharge cover and keep
hardware.
5. Attach side discharge deflector to studs
on mower. Make sure deflector covers
discharge opening.
6. Secure with cover hardware from step 4.
To Mulch
1. Shut off unit.
2. Remove grass bag and install side
discharge cover.
3. Open rear door and insert Mulchmaster
plug with the beveled face to the left.
4. Close rear door.
NOTE: Rear door must close flush.
NOTE: For maximum mulching performance,
install the Mulchmaster Mulching kit. See
Accessories.
EMERGENCY STOPPING
To stop the mower in an emergency:
1. Release the engine/blade control.
2. Release the wheel drive control (selfpropelled models).
3. Allow all moving parts to stop before
leaving operator’s position.
STARTING AND SHUT OFF
WARNING: Improper operation can
lead to injury. Learn what the
controls do and how they work.
Thoroughly read and understand
entire Operator Manual.
See Figure 1 for all Controls and Features.
NOTE: Start engine on a level surface that is
free of debris.
Manual Start
1. Check each item under Before Each Use
in the Maintenance Schedule.
GB - 12
Page 12
2. For engines with a primer, push primer
bulb 2 or 3 times for a cold engine.
NOTE: It is unnecessary to prime or choke a
warm engine.
3. With engine/blade control held against
the handlebar, grasp starter handle and
pull rope slowly until it pulls harder. This
is the compression stroke. Let rope
rewind slowly.
4. Pull rope with rapid continuous full arm
stroke to start engine. Allow rope to
rewind slowly.
IMPORTANT: DO NOT let starter handle snap
against bracket.
5. Repeat steps 4 and 5 until engine starts.
(If engine does not start, refer to
Troubleshooting.)
Shut Off
1. Release wheel drive control and allow
unit to stop completely (self-propelled
models).
MAINTENANCE
2. Release engine/blade control.
Mowing Tips
Cut grass when it is dry.
Keep mower blades sharp.
Do not set cutting height too low. For tall
grass, mow twice.
Do not mow too fast.
Discharge clippings into areas already cut.
Vary cutting p att ern with each mowing.
NOTE: To prevent dirt and grass from
collecting on mower pan, avoid operating over
bare ground with only patches of grass.
Mulching Tips
For best mulching performance, cut no more
than 1 inch (2.54 cm) of grass per cutting.
CAUTION: AVOID INJURY. Read
and understand the entire Safety
section before proceeding.
Ariens Dealers will provide any service, parts
or adjustments which may be required to keep
your unit operating at peak efficiency. Should
engine require service, contact an Ariens
dealer or an authorized engine manufacturer's
service center.
MAINTENANCE SCHEDULE
NOTE: Some working conditions (heavy
loads, high ambient temperatures, dusty
conditions, or airborne debris) may require
more frequent service.
See engine manual for further maintenance
and troubleshooting information.
MAINTENANCE SCHEDULE
Service Performed Before
Each
Use
Check Engine/Blade
Control
Check Wheel Drive
Control
Check Grass Bag •
Clean Unit •
Check Engine Oil •
Check Mower Blade •
Check Drive Belt •
Check Fasteners •
Check Air Cleaner •
Change Engine Oil
General Lubrication •
Check Spark Plug •
Check Engine
Cooling
Check Muffler •
After first 5 Hours of operation
CHECK ENGINE/BLADE
CONTROL
The engine and blade must stop within 3
seconds after releasing the control. If the
engine and blade continue to run, adjust or
repair control immediately. See Service and
Adjustments.
25 100
•
•
•
•
GB - 13
Page 13
CHECK WHEEL DRIVE CONTROL
(self-propelled models)
The unit must stop quickly and completely
when the control is released. Adjust or repair if
necessary. See Service and Adjustments.
CHECK GRASS BAG
Check grass bag frequently for wear or
deterioration. Replace worn or damaged bag
with Ariens original equipment replacement
bag only.
CLEAN UNIT
Before each use clean unit, muffler and engine
surfaces of debris, oil or fuel spills to ensure
proper cooling and prevent fires.
3
1
Replace
2
1
OM0235
4
CHECK ENGINE OIL
IMPORTANT: Proper oil level must be
maintained at all times or engine damage will
result.
Check the level of the engine crankcase oil
before each use.
Make sure engine is level when checking oil.
See engine manual for instructions.
CHECK MOWER BLADE
See Figure 7.
Check blade mounting: blade must be secure
and bolt torqued to 37.5 - 50 ft. lbs. (bolt
should fully compress lock washer).
Check blade for nicks and dull cutting edges.
Sharpen if necessary.
Check blade for rounded or broken ends,
thinned metal or other damage. Replace if
necessary.
NOTE: Blades should be sharpened and
balanced professionally. Contact your Ariens
Dealer.
To remove blade:
1. Block blade to prevent rotation.
2. Remove bolt, lock washer, flat washer
and blade from shaft.
To install blade:
1. Replace blade, flat washer, lock washer
and bolt on shaft.
2. Torque bolt to 37.5 - 50 ft. lbs. (bolt
should fully compress lock washer).
OM0246
1. Cutting Edge
2. Square Corner
3. Air Lift
4. Air Lift Erosion
Figure 7
CHECK DRIVE BELT
Check drive belt and replace if worn or
damaged. See Service and Adjustments.
CHECK FASTENERS
Check all fasteners for proper tightness. Pay
special attention to blade hardware and all
guards, shields and safety devices.
CHECK AIR CLEANER
See engine manual for specific information.
CHANGE ENGINE OIL
IMPORTANT: Change engine crankcase oil
after first five (5) hours of operation. Then
change oil after every 25 hours of operation.
Refer to engine manual for instructions and
proper oil type.
IMPORTANT: Proper oil level must be
maintained at all times or engine damage will
result. DO NOT overfill. Be sure engine is level
when adding oil.
GENERAL LUBRICATION
Mower
Mower requires no lubrication.
CHECK SPARK PLUG
Spark plug should be replaced every 100
hours of operation or each year.
GB - 14
Page 14
NOTE: Loose spark plug wire terminals can
cause sparking. Replace terminal if damaged.
CHECK ENGINE COOLING
Every 100 hours of operation or yearly (more
often if conditions require) remove blower
housing and clean cooling fins. See engine
manual for instructions.
WARNING: HOT SURFACES can
cause death or serious injury. DO
NOT TOUCH parts which are hot
from operation. ALWAYS allow parts
to cool.
To prevent overheating, air must circulate
freely around the cooling fins, cylinder head
and block.
SERVICE AND ADJUSTMENTS
CAUTION: AVOID INJURY. Read
and understand the entire Safety
section before proceeding.
SERVICE POSITI ON
Put unit into service position for easy access
to underneath the deck.
CAUTION: Avoid fuel spills. Follow
steps below to help prevent fuel
spills. If fuel leaks into air cleaner,
replace air cleaner. ALWAYS clean
up any spilled fuel.
1. Place unit on a flat, level surface.
2. Remove fuel cap, place a piece of plastic
bag over the opening and tighten cap
securely.
3. Adjust handlebar forward to service
position and secure (Figure 8).
4. Tip unit onto left side, opposite the
discharge opening.
Make sure unit is secure and will not tip
over.
IMPORTANT: Remove plastic from fuel cap
after unit is upright and service is complete.
CHECK MUFFLER
Check muffler for debris, cracks, wear, or
other damage.
CAUTION: Replace worn out
mufflers immediately. Continued use
could result in fire or explosion.
Figure 8
OM0217
HANDLEBAR HEIGHT
To adjust (Figure 9):
1. Place a hole at the bottom of the braces
over the pins on the bracket.
Pin
Hole
GB - 15
Figure 9
OM0275
Page 15
ENGINE/BLADE CONTROL
ADJUSTMENT
To adjust engine/blade control:
1. Loosen cable nuts away from bracket.
4. Tighten lower
cable nut to 1/8"
(3mm) below
bracket. Release
z-bend bracket.
1/8
(3mm)
OM1010
2. Squeeze z-bend bracket at engine end of
cable toward front of unit and hold in
place.
Quantum
OM1040
3. Pull cable down from bracket until there
is no slack in cable.
5. Tighten upper
OM1020
cable nut until
bracket is secure
between cable nuts.
OM1030
6. Engage engine/blade control. Measure
distance between middle of z-bend and
cable bracket. Measurement should be
as shown below.
1.325"-1.788"
(3.4cm - 4.5cm)
Quantum
7. If correct measurement cannot be set,
contact your local dealer.
OM1051
No slack
OM1061
GB - 16
Page 16
DRIVE BELT REPLACEMENT
(self-propelled models)
6
2
WHEEL DRIVE CONTROL
ADJUSTMENT (self-propelled
models)
See Figure 11.
1
4
3
5
1. Blade
2. Bolt, Lock Washer &
Flat Washer
3. Drive Belt
4. Idler
5. Drive Sheave
6. Engine Pulley
Figure 10
To remove drive belt:
1. Set the right rear wheel to its lowest
cutting height, and the left rear wheel to
the third cutting height. This position
provides clearance between friction disc
and drive sheave.
2. Remove belt from the idler, then the drive
sheave, and finally, the engine pulley
(Figure 10).
3. Pull belt through opening under mower
pan and over blade.
4. Make sure the idler pulley turns and the
idler arm moves freely.
5. Reinstall drive belt in reverse order.
IMPORTANT: Be sure the belt seats in sheave
and pulley grooves with the idler touching the
back (flat) side of belt.
6. Adjust rear wheels to the same cutting
height.
OM1250
1-1/2" to 2"
(3.8 to 5cm)
2
3
1
1. Traction Cable
2. Handlebar Indentation
3. Cable Nuts
4. Wheel Drive Control
Figure 11
The wheel drive must start to engage when
wheel drive control is between 1-1/2” and 2”
(3.8 and 5 cm) away from the handlebar.
To check:
1. With engine off, select a slow speed.
2. Slowly pull unit backwards.
3. Slowly squeeze wheel drive control until
wheels stop.
4. Measure the distance between the wheel
drive control and handlebar at the
handlebar indentation.
To adjust:
1. If the measurement is more than 2”
(5cm), loosen the lower cable nut and
then tighten the upper cable nut against
the adjuster bracket.
2. If the measurement is less than 1-1/2”
(3.8cm), loosen the upper cable nut and
then tighten the lower nut against the
adjuster bracket.
3. Recheck measurement with the slowest
and fastest speeds selected.
4. Repeat adjustment until wheel drive
control is properly adjusted.
IMPORTANT: If there is not enough thread
length for proper adjustment, contact your
Dealer for repairs before operating unit.
OM0290
4
GB - 17
Page 17
SPEED CONTROL BELL CRANK
(self-propelled units)
The speed control bell crank holds the speed
control rod in position after a speed has been
set. The spring washers may become loose
with normal wear. If the speed control rod
does not stay firmly in position, adjust the
speed control bell crank. See Figure 12.
To adjust:
1. Remov e cover, fully compress the
helical spring lock washers with lock
nut and then back lock nut off, one
quarter turn.
2. If the speed control rod is still too loose,
tighten lock nut by small increments
until it holds its position. Tightening the
lock nut too much will not allow the
speed control rod to move at all.
3. Align notch in left hand side of cover
with bolt and secure with knob.
STORAGE
CAUTION: AVOID INJURY. Read
and understand the entire Safety
section before proceeding.
IMPORTANT: NEVER spray unit with water or
store unit outdoors. Store mower in a cool, dry,
protected location.
Cleaning
Clean unit thoroughly . Brush off dirt and debris
from all surfaces. Touch-up all scratched
surfaces to prevent rust. Matching touch-up
paint is available from your Ariens Dealer. Do
not use abrasives, solvents, or harsh cleaners.
Inspection
Inspect mower and repair or replace worn or
damaged parts to avoid delays when
beginning use again.
Regularly check all hardware and keep
fasteners tight. Know unit is in safe working
condition.
1
2
4
3
5
1. Lock Nut
2. Helical Spring
Lock
Washers
Figure 12
6
3. Speed
Control Bell
Crank
4. Speed
Control Rod
5. Hair Pin
OM0300
Grass Bag
Wash out grass bag and allow to dry before
storage. Grass bag may be stored in position
on mower.
Engine
When storing unit for extended periods of
time, remove all fuel from tank and carburetor
(run dry). Refer to engine manual.
GB - 18
Page 18
TROUBLESHOOTING
PROBLEM PROBABLE CAUSE CORRECTION
Engine will
not start
Engine is
difficult to
restart
Cut is poor
Grass does
not disperse
evenly
Mower does
not bag
clippings
Wheel drive
does not
engage (SelfPropelled
models).
1. Fuel tank empty or low.
2. Spark plug wire loose or off.
3. Engine/Blade control cable
detached, broken, or not
adjusted properly.
1. Mower clogged with grass. 1. Clear clippings from under
1. Worn blade.
2. T oo much grass is being
removed per cutting.
3. Grass is too wet.
4. Mowing speed is too fast.
1. T oo much grass is being
removed per cutting.
2. Grass is too wet.
3. Mowing speed is too fast.
1. Grass bag is overfilled.
2. Mulching plug is installed.
1. Wheel drive control not
engaged.
2. Drive belt out of position.
3. Drive belt worn or damaged.
4. Rear wheels in different cutting
heights.
5. Idler spring detached.
6. Wheel drive control cable
detached or broken.
7. Friction disc not adjusted
properly or damaged.
8. Bearings damaged.
9. Debris in gear set.
1. Check fuel level. Fill tank if
necessary.
2. Check connection.
3. Check cable. Adjust, repair
or replace as necessary.
mower. (Allow the mower to
clear clippings before
shutting off engine.)
1. Check blade (See
Maintenance).
2. Raise cut ting height.
3. Allow grass to dry.
4. Mow slower.
1. Raise cut ting height.
2. Allow grass to dry.
3. Mow slower.
1. Empty grass bag and do not
allow it to overfill.
2. Remove mulching plug.
1. Engage wheel drive control.
2. Check drive belt. Adjust as
necessary (See Service and
Adjustments).
3. Replace belt (See Service
and Adjustments).
4. Adjust rear wheels to same
cutting height (See
Operation).
5. At tach idler spring to notch
on idler arm. Contact your
Dealer.
6. Check wheel drive control
cable. Adjust or replace as
needed. See Service and
Adjustments.
7. Contact your Dealer.
8. Contact your Dealer.
9. Contact your Dealer.
GB - 19
Page 19
SERVICE PARTS
Always use genuine Ariens parts to keep
your mower running like new.
Mower Model 911086 911087
Air Filter 21535600
Fuel Filter 21533900
Blade 01137000
ACCESSORIES
See your authorized Ariens dealer to add
these optional accessories.
71102400 Dethatcher
71103700 Leaf Shredder
71103000 Grass Bag
71103200 Rear Discharge Chute
71103500 Mulchmaster Mulching Kit
71104100 Swivel Wheel Kit
GB - 20
Page 20
SPECIFICATIONS
Model Number 911086 911087
Description LM21 LM21S
Length - in (cm) 61.5 (156)
Height - in (cm) 38 (96,5)
Width - in (cm) 23 (58,4)
Actual Weight - lbs (kg) 77 (35) 93 (42,27)
Cutting Width 21 (53,3)
Cutting Height - in. (cm) 6 Positions: 1.00 - 3.25
Engine, 4 cycle Briggs & Stratton Quantum
Engine Power Max - HP (kw) 3.6 (2,6)
Max Rotation Speed
of Cutting Edge - RPM (min
Governed RPM 3000 +/- 100
Displacement Cu. In. (cc)
Cylinder Bore Aluminum
Engine Oil Type SAE 30
Crank Case Capacity - Oz. (Liter) 20 (0,59)
Oil System Splash
Spark Plug Gap - in (mm) 0.020 (0,51)
Fuel Type Unleaded
Fuel Tank Capacity - qt (Liter) 1.6 (1,5)
Primer Bulb Standard
Air Cleaner Paper Element
Starting Recoil
Differential N/A Standard
Variable Speeds - MPH (km/hr) N/A 0-4 (0-6,4)
Mower Deck 14 Gauge - Stamped Steel
Adjustable Handlebar Four Position
Front Wheel Dia - in (cm) 7.0 (17,8) 7.5 (19,1)
Rear Wheel Dia - in (cm) 10.0 (25,4) 10.5 (26,7)
-1
)
(2,5 - 8,3)
3100
12 (197)
GB - 21
Page 21
GB - 22
Page 22
Ariens Company
655 West Ryan Street
P.O. Box 157
Brillion, WI 54110-0157
920-756-2141
Fax 920-756-2407
www.ariens.com
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