Atom 550 Deluxe Installation instructions

PATENTED WORLD’S BEST
LAWN EDGERS
Model 550
Deluxe
Honda Powered 25cc 4-Stroke
Gasoline Model
OPERATOR/OWNER
MANUAL
●SafetyPrecautions
●Assembling
●Operating and
Edging Instructions
●Maintenance and
Workshop Manual
®
ATOM
AS WITH ANY
POWER TOOL
IMPROPER USE
CAN CAUSE
SERIOUS INJURY
MAKE SURE THIS
MANUAL IS READ
AND CAREFULLY
UNDERSTOOD
BEFORE STARTING
OR OPERATING
THISEQUIPMENT
NOTE:Forfull“Honda”engineinstructionsandmaintenancepleaserefertoseparate
“Honda Owners Manual” supplied.
IMPORTANT MANUAL – DO NOT THROW AWAY
Manual always to be available for reference or instructing new operators. Please fill
in details of purchase on back cover page.
ACN 000 583 924
✔

Failure to obey a safety
warning can result in
injury to yourself and others.
THE PURPOSE OF SAFETY WARNING AND NOTES IN THIS
MANUAL IS TO ATTRACT YOUR ATTENTION TO POSSIBLE
DANGERS AND THE EXPLANATIONS WITH THEM DESERVE YOUR CAREFUL ATTENTION AND
UNDERSTANDING. THE SAFETY WARNINGS IN THIS MANUAL AND ON THE EDGER DO NOT, BY
THEMSELVES, ELIMINATE ANY DANGER. THE INSTRUCTIONS OR WARNINGS THEY GIVE ARE NOT
SUBSTITUTES FOR PROPER ACCIDENT PREVENTION MEASURES.
INTRODUCTION
This Atom Gasoline Powered Lawn Edger is designed
to the highest standards to ensure you many hours of
uninterrupted service.
Pay special attention to the safety precautions outlined
on pages 2 to 5. Only persons who understand this
Manual are to operate the Lawn Edger.
Toreceive maximumperformanceandsatisfaction from
your Lawn Edger, it is important that you read and
understand the maintenance and safety precautions
before using the edger. Contact yourAtom dealer or the
Atom distributor in your area if you do not understand or
cannot carry out any of the operating instructions in this
Manual.
Atom’s philosophy is to continually improve all of its
products. As a result, engineering changes and
improvements are made from time to time. If the
operating characteristics or the appearance of your
Atom Edger differs from those described in this
manual, please contact your Atom dealer for
information and assistance. Call [phone]
(withinAustralia) for your nearest servicing dealer.
NOTE: OUTSIDE AUSTRALIA REFER TO BACK
COVERPAGE.
CONTENTS
Parts and Controls ................................................2-3
Safety Precautions ................................................3-5
Assembling the Lawn Edger.....................................6
Fuel and Oil..............................................................6
Starting and Stopping Instructions .........................7-8
Edging Instructions...................................................8
Maintenance Instructions
Blade Replacement ........................................10
Lubrication of Gears........................................ 11
Spark Plug ...................................................... 11
Air Filter Maintenance...................................... 11
Removing Blade Cover ................................... 11
Carburettor Adjustment ...................................12
Trouble Shooting Tips......................................13
Parts List and Exploded View ............................14-15
Complete Workshop Manual .............................16-19
At the rear of this manual is a workshop manual for the
lawnedgerbody.ForfullHondaengine instructions and
maintenance, please refer to the separate “Honda
Owner’s Manual” supplied.All service and warranty on
your Honda engine can be done by your nearest
approved Honda dealer ....................................16-19
Warranty ................................................................20
PARTS & CONTROLS
1,2 The handles of the Lawn Edger are held by both
hands.
3 The throttle trigger which increases speed of
engine for automatic safety clutch to engage and
thus rotate blade.
4ON/STOP switch.
5Starter grip the grip of the pull starter which is the
device to start the engine.
6Handle nut for holding handles onto housing.
7Height adjustment for adjusting depth of cutting
blade.
8Blade cover reduces the risk of flying debris and
direct contact with the feet or hands.
9Sight guide for edging.
10 Cutter blades rotate when engine speed is
increased above idle.
11 Grass shield debris deflector reduces flyback of
stones and foreign material.
12 Wheel for moving and guiding edger.
13 Cross Brace, attaches downward on handle.
14 Left and right Handle Tubes.
15 Fuel cap, for sealing the fuel tank filler.
16 Fuel Tank.
17 Choke lever for cold engine starting.
18 Filter housing covers the air filter element.
19 Muffler reduces exhaust noises and diverts gases
away from operator.
20 Spark Plug terminal cap connects the spark plug
to the ignition wire.
21 Fuel pump primer under carburettor provides
additional fuel for starting.
22 Warning Label, on left handle.
23 Warning Label, on blade guard.
2
SAFETY WARNINGS
!
!WARNING !NOTE Advises you of information or
instructions vital to the
operation or maintenance of the equipment.

This Lawn
Edger must
not be operated by minors.
Bystanders, especially children
and animals, should not be
allowed in the area where a
machine is in use at least 15
metres (50 feet) away (Fig. 4). Never let the unit
run unattended.
As with any power tool,
the use of any lawn edger
may be dangerous. It is important that you read,
fully understand, and observe the following
safety precautions and warnings. Re-read this
operator’s manual and the safety instructions
periodically.
SAFETY PRECAUTIONS
3
PARTS & CONTROLS (CONTINUED)
Do not lend, rent or sell
this machine without the
operator’s manual. Be sure that anyone using
this unit understands the information contained
in this manual before use.
As with any power tool,
some special safety
precautionsmustbeobserved to reduce the risk
ofpersonalinjury. Careless or improperusemay
cause serious or even fatal injury.
Safe use of an Atom Lawn Edger involves:
1. The Operator
2. TheAtom Edger
3. The use of theAtom Edger
Electrical shock. Never
touch electrical wires or
components while the engine is running. They
are sources of high voltage and can give you
an electrical shock. Replace immediately any
faulty tension lead or spark plug cap.
THE OPERATOR
PHYSICAL CONDITION
Operator must be in good physical
condition and mental health, and not
under the influence of any substance
(drugs, alcohol, etc.) which might
impair vision, dexterity or judgement
(Fig. 3).
!WARNING
!WARNING
!WARNING
!WARNING
!WARNING
22
WARNING – TO PREVENT SERIOUS INJURY
FOLLOW ALL SAFETY PRECAUTIONS IN OPERATOR MANUAL – IMPROPER USE CAN CAUSE SERIOUS OR FATAL
INJURY • OBJECTS MAY BE THROWN OR RICHOCHET IN ALL DIRECTIONS – ALWAYS WEAR EYE PROTECTION •
KEEPBYSTANDERSAT LEAST 50FT (16M)AWAY•ALWAYS WEAR EAR PROTECTION • WEAR SNUG FITTING CLOTHING
• MINORS SHOULD NEVER BE PERMITTED TO USE THIS EDGER • WEAR STURDY SHOES WITH NON-SLIP SOLES •
DO NOT LEND, RENT OR SELL THIS EDGER WITHOUT THE OPERATOR MANUAL.
ROTATINGBLADE
DIRECTION OF ROTATION
WARNING
KEEP INSIDE OF BLADE GUARD CLEAN.
ESPECIALLY IN WET CONDITIONS A
CLOGGED GUARD CAN SLOW DOWN
OR STOP BLADE ROTATION AND MAY
CAUSE DAMAGE TO AUTOMATIC
SAFETY CLUTCH. ALWAYS OPERATE
BLADE AT HIGH SPEED WHEN EDGING.
DANGER !
KEEP HANDS & FEET AWAY

4
SAFETY PRECAUTIONS (CONTINUED)
Prolonged use of any
hand-held powered
machine exposing the operator to vibrations
may produce whitefinger disease (Raynaud’s
phenomenon)orcarpal tunnelsyndrome.These
conditions reduce the hand’s ability to feel and
regulate temperature, produce numbness and
burning sensations, and may cause nerve and
circulation damage and tissue necrosis.
!WARNING
PROPER CLOTHING
Clothing must be sturdy and snug-fitting, but allow
complete freedom of movement (see Fig. 5). Avoid
loose-fitting jackets, flared or cuffed pants, or anything
that could trip the operator. Wear overalls
or long pants to protect your legs. DO
NOT wear shorts. Use of gloves when
working with the Lawn Edger is
recommended.
Good footing is most
important. Wear
sturdy shoes with
nonslip soles.
DO NOT wear
sandals or
operate with bare
feet. In hot or
sunny conditions,
always wear a hat
and long sleeve shirt for protection against skin
cancers. Use of a good brand of sunscreen cream is
also recommended on exposed skin surfaces.
Proper eye protection is
a must. The blade cover
maynotprotect the operatorfromallfast moving
foreign objects, even though the discharge is
directed away from the operator, as ricochets
and bouncebacks may occur during lawn
edging operations. Never operate an Atom
Edgerunlesswearinggogglesor properly fitting
safety glasses with adequate top and side
protection which comply with ANSI Z 87.1.
!WARNING
Replace immediately broken or cracked blade covers
and grass shield debris deflector.
Engine noise may damage your hearing. Wear sound
barriers(earplugsorearmufflers)toprotectyourhearing.
Continual and regular users should have their hearing
checked regularly.
SAFE FUELING INSTRUCTIONS
Gasoline is an extremely
flammable
and explosive fuel. Use
extreme caution when handling
gasoline. Do not smoke or
bring any fire or flame near the
fuel (Fig. 6).
!WARNING
Refuel outdoors only. Always switch off the engine
andallow itto coolbeforerefueling.Relievefueltank
pressurebylooseningfuelcap slowly.Neverremove
fuel filler cap while engine is running.
Select bare ground for fueling, then move at least 3
metres(10 feet) fromthe fueling spot before starting the
engine.WipeoffanyspilledfuelbeforestartingyourAtom
Edger and check for leakage.
Always tighten fuel filler cap securely after fueling.
Do not operate the Edger when fatigued. Be alert – if
you get tired while operating the machine, take a break.
Tirednessmayresultinlossofcontrol.Workingwithany
power tool can be strenuous. If you have any condition
thatmightbeaggravatedbystrenuouswork,check with
your doctor before operating the machine.
Always allow engine to
cool before refueling.
Accidental spillage of gasoline over hot engine
could cause fire or explosion to occur with
consequent possible disfigurement or fatal
injury. Wash and clean hands after fueling.
!WARNING
The Atom Edger unit uses gasoline only for fuel (Refer
“Fuel and Oil,” page 6).
SAFE STARTING
You should always inspect your unit before starting it.
Make sure the controls and safety devices are working
properly.
Place the machine on firm ground or other solid surface
in an open area. Maintain good balance and secure
footing.
!NOTE When you pull the starter grip,
do not wrap starter rope around
your hand. Do not allow grip to snap back, but
guide starter rope slowly back to permit rope to
rewind properly.
Failure to follow this procedure may result in injury to
hand or fingers or may damage the starter mechanism.
The Atom Edger is a one-
person machine. To
reducetherisk of eye orotherinjury from thrown
objects, ensure that bystanders are at least 15
metres (50 feet) away during use. Replace
immediatelyanywornor broken debris deflector
shield or blade cover. If approached, release
throttle trigger to immediately de-accelerate the
engine.
!WARNING

5
SAFE WORKING INSTRUCTIONS
AND IMPORTANT ADJUSTMENTS
Neveroperateyourmachineifitisdamaged,improperly
adjusted or not completely and securely assembled.At
correctidlespeed,thebladeshouldnotturn.Donotuse
theAtomEdgerwithincorrectidlespeed(referAdjusting
the Carburettor instructions on page 12).
SAFE MAINTENANCE, REPAIR
AND STORING
Use only original Atom replacement parts for
maintenance and repair. Use of parts manufactured by
others will void warranty and/or may cause serious or
fatal injury.
SAFETY PRECAUTIONS (CONTINUED)
Always stop the engine,
make sure that the blade
is stopped, and disconnect the spark plug
before adjusting blade height, doing any
maintenance or repair work, or cleaning the unit
or blade.
!WARNING
Follow the maintenance instructions in the appropriate
sectionofthismanual.Anyrepairsshouldbecarriedout
by an authorized servcie dealer or person with suitable
servicing experience.
A worn or damaged
muffler is a fire hazard
and may cause loss of hearing. Check to see
that the muffler is in good condition. The lawn
edger must not be operated if the muffler is not
functioning properly, is damaged, or has been
removed. In order to reduce the risk of fire, do
not modify or remove any part of the muffler and
ensure it is not worn or broken.
!WARNING
Rememberthat the risk offorest or grass firesis greater
in hot weather.
Check fuel filler cap for leaks at regular intervals. Use
thespecifiedsparkplugandmakesureitandtheignition
lead are always in good condition.
Never touch a hot muffler
as burns will result.
!WARNING
StoreAtom Edger in a dry, high or blocked location and
out of reach of children.
Never store the machine
with gasoline inside a
building where fumes may reach an open flame
or spark (e.g. gas or oil-fired heater appliance,
electric motor, etc.).
!WARNING
Beforestoringforalongerperiod,alwaysemptythefuel
tank.
Keep the space behind and beside the engine clear at
alltimes to allow for the escape of hot and toxic exhaust
fumes.
Operateyourmachineundergoodvisibilityanddaylight
conditions only. Work carefully.
The engine exhaust from
this product contains
chemicals known to the State of California to
cause cancer, birth defects or other
reproductive harm.
SAFE WORKING CONDITIONS
When working with the Atom Edger, always wrap your
fingers tightly around each handle. Keep your hands in
this position to have your machine under control at all
times. NEVER attempt to operate the Atom Edger with
one hand, as a loss of control may result in serious or
fatal injury.
Make sure the handle grips are in good condition and
free of moisture, pitch, oil or grease. Use both hands,
one on each handle, to operate and control the lawn
edger. Do not overreach. Keep proper footing and
balance at all times.
!WARNING
Do not touch hot engine
during and immediately
after use as you may burn yourself.
!WARNING
!WARNING Start and operate your
unit outdoors and in a
ventilated area.

DANGER!
FUEL IS EXTREMELY FLAMMABLE. HANDLE IT
WITH CARE. KEEP AWAY FROM IGNITION
SOURCES. DO NOT SMOKE WHILE FUELING
YOUR EQUIPMENT.
Always allow engine to
cool before refueling.
Accidentalspillageofgasoline over a hot engine
could cause fire or explosion to occur. See
Page 4 – Safe Fueling Instructions.
Running the engine with
insufficient oil can cause
serious engine damage. Be sure to check the
engine on a level surface, with the engine
stopped, at regular intervals.
YourAtomEdgerispoweredby a four-stroke, air cooled
enginewhichrequiresunleadedgasolineonlyinthefuel
tank.
NOTE: Do not mix oil with the gasoline.
Onlyusesufficientfuelforafewweeksworkandstorein
an approved safety type container.
Pressure may build up in
the canister. Remove fuel
cap slowly to avoid injury from fuel spray.
Replace fuel cap securely. Take care when
handling gasoline.Avoid direct contact with the
skin and avoid inhaling fuel vapor.
!WARNING !WARNING
!WARNING
!WARNING
ASSEMBLING THE lll ATOM LAWN EDGER
6
Beforefuelingtheedger,cleanthefiltercapandthearea
around it to ensure that no dirt falls into the tank.
ENGINE OIL LEVEL
1. Removetheoilfillercapandfilltankwithoilcontainer
supplied and check the oil level: it should reach the
top of the oil filler neck.
2. If the level is low, fill to the top of the oil filler neck
with the recommended oil.
After every 10 hours use, check the engine oil level and
replenish oil up to the top of the oil filler neck.
FUEL AND OIL
A. Fit left handle tube #1 to edger body #2 as
shown. Note: Left handle has instruction label.
B. Insert 150mm (6”) bolt #3 through handle bolt hex
head retainer #9 then through left handle tube #1,
edger body #2 and right handle tube #11.
Note: Plastic retainer #9 to be pointing
forward.
C. Screw large wing nut #10 on protruding
bolt #3 and tighten.
D. Fit cross-brace #4 to handles #1 and
#11 with brace touching ground. Use
2 screws #5 and 2 lock nuts #6
provided in packet. Use straight
bladed screwdriver (or Torx 25
screwdriver).
E. Insert trigger handle #7 into
right handle tube #11 using
one screw #5 and one nut
#6 to hold in place.
Note: Throttle cable/switch
wire from engine must be
fitted under handle and
clipped into holding lugs
of cross-brace #4. Do not
loop throttle cable/switch
wire over handle.
F. Insert left handle #8 into left handle tube #1 using
one screw #5 and one nut #6 to hold in place.

Fill or add fuel to the tank
only when the edger is in
a horizontal position as shown (Fig. 9). Allow
enginetocooldownfor at least 5 minutesbefore
adding fuel. Use fuel funnel (not supplied) to
prevent spills.
STARTING & STOPPING INSTRUCTIONS
7
FUEL AND OIL (CONTINUED)
IMPORTANT NOTE
DO NOT use old or stale gasoline. Always use the
proper gasoline, otherwise your engine will suffer
rapid, permanent damage and you will void the
engine warranty.
!WARNING
Using nondetergent oil or
2 stroke engine oil could
shorten the engine’s service life.
!WARNING
3. Press and release
the primer bulb
5 times (Fig. 12).
4. Make sure you
have a firm footing.
Hold down motor
with left hand and
put one foot on the
cross brace. With
right hand pull the
starter grip slowly until you feel it engage – and
then give it a fast pull (Fig. 13).
1. Place lawn edger
on ground in
horizontal position
(see Fig. 13). Be
sure the ignition
switch is “ON”.
Switch located on
top of trigger handle
(See Fig. 10).
2. COLD START:
Slide the choke level to full choke position
(Fig. 11).
Use Honda
4-stroke, or an
equivalent high
detergent,
premium
quality motor
oil certified to
meet or
exceed U.S.
automobile
manufacturer’s
requirements for service classification SG, SF. Motor
oils classified SG, SF will show this designation on the
container. SAE 10W-30 is recommended for general,
all temperature use.
Do not pull out starter rope more than 65cm (26”) – it
might break. Stand between handles to start. Do not let
starter grip snap back. Guide it back slowly so that the
starter rope can rewind slowly.

8
STARTING & STOPPING INSTRUCTIONS (CONTINUED)
1. TheAtomEdger isveryeasyandsimpleto use.For
some people, it may take a few edgings to become
use to it.
2. Thoroughly inspect the area where the edger is to
be used and remove all stones, sticks wires and
other foreign objects.
3. Adjust blade height (Fig. 15). With a new blade, try
the second hole closest to operator.
5. PULL THE STARTER ROPE BRISKLY until the
engine starts. Gradually move the choke lever to
the open position. Allow engine to warm-up until it
runs smoothly.
6. Throttle trigger (engine accelerator control) is
operatedbypushingdowninterlockwiththumband
pulling on trigger (Fig. 14).
TO AVOID PERSONAL
INJURY, NEVER CARRY
THE EDGER WHILE THE ENGINE IS RUNNING.
Stay clear of the rotating blade. Stop the engine
prior to making adjustments and cleaning.
!WARNING
EDGING INSTRUCTIONS
7. HOTOR WARMSTART:(Enginehasalreadybeen
started and warmed up). Switch ignition “ON”.
Make sure you have a firm footing with one foot on
the cross brace. Pull starter until motor runs, allow
to warm-up.
NOTE: A built in automatic centrifugal clutch
disengages the blade from rotating at engine idle
speed. The clutch engages the blade when the
engine speed is increased.
8. FLOODEDENGINE:(Enginewillnotstart).Ifsmoke
orfuelcomesfromexhaustandenginewillnotstart.
a) Check that ignition switch is “ON”, CHOKE
LEVER is on RUN position (Fig 14A).
b) Pull starter rope up to 10 times to clear engine
of fuel so it can start.
c) If engine has excessive fuel that cannot be
cleared by (a) & (b) above, remove spark plug from
engine and from spark plug terminal, crank engine
to clear excess fuel, wipe and dry spark plug of all
fuel, re-install spark plug terminal, and restart as
above.
9. To stop engine push ignition switch down on top of
throttle trigger (Fig 10).
AFTERFINISHINGWORK
Storing for a short period: Keeptheunit in a dry place
until you need it again. Do not store where open flame
or electrical machinery is operating.
Storing for a long period: Drain the fuel tank and run
engine until carburettor is dry.
4. With both arms extended
downwards, as in Fig. 16, hold
both handle grips firmly. With
the engine running, pull the
throttle trigger full on. Engine
must run at full speed.

9
EDGING INSTRUCTIONS (CONTINUED)
Only operate unit when
moving forward. DO NOT
operate walking backwards, as you may trip, fall
and injure yourself.
!WARNING
5. If blade is not deep enough, or if digging too deep,
adjustbladeheight,orslightlyraiseorlowerhandles
tosuitdepthrequired(Fig.17).However,itisalways
more comfortable and relaxed to have arms
extended downwards.
6. Do not lift handles by excessive bending of
elbows (Fig. 18). Always keep arms straight as
shown in Fig. 16.
Note:Whencuttingefficiently, engine speed should
be full throttle under load and blade turning at high
speed.
9. If blade jams or
stops in the
ground (Fig. 20),
lower handles or
release trigger
and recommence.
Engine speed
should be full
throttle under
load with blade
rotating at high
speed.
10. Edging along
Concrete edge:
For position of blade, align edge guide (at front of
blade cover) with edge of concrete. If blade hits
concrete,lowerhandlesandre-positionbladeatside
of concrete. Even with the grass growing over the
concrete and you cannot see the edge, you can
feel the edge of the concrete with the rotating
blade by slightly sideways tilting the handles of
the edger away from the concrete so that the
blade tilts towards the concrete and skims the
concreteedgeandactsasaguide(Fig 21).Edger
blades are made from high tensile hardened spring
steel and will last a long time. Once the edge is
established the second and subsequent times
around are very fast.
11. Sideways Tilting: Lower either left or right handle
to achieve angle cutting (Fig 22).
12. Clutch: The Atom Edger is equipped with a
centrifugal clutch. DO NOT run edger at low
speeds (or, if blade is jammed, at high engine
speeds) as clutch shoes will prematurely wear
and cause damage if cutting blades do not
rotate.
7. As cutting action
begins, move the
lawn edger forward
so that the blade
can cut the edge as
you move forward
(Fig. 19).
8. Continue at a
moderate pace until
you are familiar with
the controls and the
handling of the
Atom Edger.

MAINTENANCE INSTRUCTIONS
EDGING INSTRUCTIONS (CONTINUED)
USEONLYATOMBLADES.
Other blades have larger
size holes (1/2”) which will cause out-of-balance
vibrations which will damage unit and cause
injury. Other blades can also break and cause
major injury.
BLADE REPLACEMENT
1. Stopengine.Cleanarea around dust cover #44042
and pry out with screwdriver (Fig. 25) exposing
14mm hex head for unscrewing blade nut.
!WARNING
!WARNING
10
!NOTE Keep inside of blade guard
clean, especially in wet
conditions. A clogged guard can slow down or
stop blade rotation and may cause damage to
automatic safety clutch. Always operate blade
at high speed when edging.
!NOTE Do not run engine without blade
tightened to blade shaft as gear
damage will occur. Always use two blades as
shown above. Never use a single blade. Do not
use other thicker blades as you will damage the
unit.
The Lawn edger can be
transported by pushing it
on it’s wheel, or carrying
it with engine switched
off as in Fig. 23.
2. Throughdustcoverhole,place14mm(9/16")socket
and place 18mm (3/4") wrench on blade nut
(Fig. 26).
3. Unscrew nut counter (anti) clockwise (normal right
hand thread).
4. Remove one small washer, one large washer and
two blades (Fig. 27). Before installing blade and
washers, clean all grit and grease.Assemble these
parts clean and dry. Fit large washer, new blades
withspiggotsofonebladeinterlockingwithholeson
oppositeblade,largewasher,onesmallwasher,and
nut. Tighten nut to 15-20 ft. lbs. (20-27Nm) or hand
tight with 8” (200mm) or longer spanner.
TO AVOID
PERSONAL
INJURY, NEVER
CARRY THE
EDGER WHILE
THE ENGINE IS
RUNNING.
Never hold the
handle cross
brace if the
engine is running
(Fig. 24). Stop the
engine prior to
lifting or
carrying.

MAINTENANCE INSTRUCTIONS (CONTINUED)
SPARK
PLUG
The following
information is a guide
only. For more details,
refer to your “Honda
Owner’s manual”
supplied with this unit.
!NOTE CLEAN AND RE-OIL THE AIR
FILTER EVERY 5 HOURS OF
OPERATION OR DAILY.
!NOTE Using spark plugs other than
those designated may result in
the engine failing to operate properly or in the
engine becoming overheated and damaged.
5. Clean plastic dust cap and housing; press back by
gently tapping into place. Clean inside blade cover
of any built up dirt.
TO REMOVE BLADE COVER LID
For cleaning
(or major repair).
1. Lift and tap
with hammer
in clockwise
direction
(Fig 28).
2. To re-install, press down lid in centre and tap with
hammer counter (anti) clockwise.
LOOSE BLADE
Follow steps 1 and 2 of Blade Replacement and tighten
nut clockwise.
LUBRICATION OF GEARS
Thereisusuallysufficientgreasetolastatleast6months
or 125 hours for professional use before topping it up.
Thegreaseinthegearcase should be addedaccording
to use. Use a lightl, free-flowing lithium-based grease
such as Castrol EPL1 or its equivalent.This is available
in a handy to use squeeze pack with nozzle (#43227).
Remove two screws marked FILL and BLEED. Inject
grease into FILL screw hole and allow grease to begin
to eject from BLEED hole indicating gear box is 3/4 full
(Fig. 29). Refit and tighten BLEED screw and squeeze
in3to4morelotsofgrease.RefitFILLscrewandtighten.
NOTE:Donot use light or heavygearoil as it might leak
out. If case joint is damaged, clean and dry and use a
gasket sealant. Replace o-ring if damaged.
Tighten all screws. Refill casing.
CHECKING THE SPARK PLUG
Remove engine cover by unscrewing 1x5mm hex bolt
at top of cover (Fig 30). Remove spark plug cap and
unscrewsparkplug.Ifengineislowonpower, difficultto
startorrunspoorlyat idlingspeed,checkthesparkplug.
●Allow engine to cool down.
●Remove spark plug.
●Clean dirty spark plug.
●Check electrode gap.
●Rectify faults which have caused fouling of spark
plug. Possible faults include:
– Incorrect carburettor setting.
– Too much oil in oil tank.
– Old fuel.
– Dirtyairfilter.
– Unfavourable running conditions (e.g. operating
at part load).
Donotclean the sparkplug in anabrasivegrit spark
plug cleaner, as expensive damage to the engine
couldoccurthroughloose grit damaging chromein
cylinder bore.
Fit a new spark plug after approximately 100 operating
hours or earlier if electrodes are badly eroded.
AIR FILTER MAINTENANCE
The air filter (Fig 31) is one of the most important areas
to maintain. If it is not maintained, you will void the
warranty. Before cleaning, make sure the unit is turned
off.
11

MAINTENANCE INSTRUCTIONS (CONTINUED)
!NOTE Throttle cable wire is NOT to be
pulled tight (against trigger
throttle). Trigger to have small initial movement
before it pulls cable and carby throttle lever.
!NOTE Edger blade NOT to rotate when
engine is idling.
2. If filter torn or very dirty
replace.
3. Wash the filter in detergent
and water (Fig. 32). Rinse
the filter thoroughly and
allow it to dry.
4. Apply enough clean
SAE 30 oil to saturate the
filter when squeezed.
Squeeze the filter to spread
the oil and to remove
excess oil.
5. Reinstall the filter (Fig. 33A) air filter cover.
Note sequence of parts.
!NOTE CHECK TIGHTNESS OF
SCREWS at regular intervals
and retighten as necessary especially during
the first few hours of operation.
!NOTE If the unit is operated with dry
or dirty filter or without the air
filter and/or carburettor air filter cover, you will
void the warranty.
!NOTE Careless adjustments can
seriously damage the
carburettor and/or engine.
CARBURETTOR
This unit is equipped with a diaphragm-type carburettor
that has been carefully calibrated at the factory. In most
cases, no further adjustment will be required. The
condition of the air filter is important to the operation of
the edger. A dirty air filter will restrict the air flow, which
upsets the fuel-air filter mixture in the carburettor. The
resulting symptoms are often mistaken for an out-of-
adjustment carburettor. Therefore, check the condition
of the air filter before adjusting the carburettor. Refer to
Air Filter Maintenance on page 11. If the following
conditionsareexperienced,itmaybenecessarytoadjust
the carburettor:
●The engine will not idle.
●The engine hesitates or stalls on acceleration.
●The loss of engine power that is not corrected by
cleaning the air filter and muffler.
●The engine operates in an erratic or fuel-rich
condition (indicated by excessive exhaust smoke
from the muffler).
ADJUSTING THE CARBURETTOR
1. The idling screw adjustment is accessible without
removing the air filter cover. See Fig. 33B. To
increaseengineidle speed,turnIDLESCREW(#1)
clockwise (Refer Fig. 33B). To decrease engine
speed, turn IDLE SCREW counter (anti) clockwise.
Throttle trigger to be in idle position.
2. If air filter is dirty then correct idle adjustment can
not be made and air filter must be cleaned. Refer to
Air Filter Maintenance and Fig 31, 32 and 33A.
!NOTE No mixture screws for high or
low speed settings are fitted to
this carburettor. Use clean fuel and clean air
filter. No other adjustment is required due to
fixed jets fitted.
12
Thethrottlecablenormalplayis.040”to.080”(1to2mm)
when measured at the carburettor side. Re-adjust with
the cable adjuster (#2) as required and re-adjust the
idle screw (#1) on carburettor as required.

13
MAINTENANCE INSTRUCTIONS (CONTINUED)
FUEL FILTER
When the engine
runs short of fuel
supply and the tank
has gasoline in it,
clean the fuel filter
for blockage
(Fig. 34).
CHECKING EXHAUST MUFFLER
!NOTE If debris causes blockage
around the intake air cooling
vent or between the cylinder fins, it may
cause the engine to
overheat, and that
in turn may cause
mechanical failure
on the part of the
Atom Edger.
Remove air
deflector to clean.
Tighten exhaust screws. If exhaust gasket is leaking,
replace gasket. If the engine is low on power, check the
muffler.Allow motor to cool down. Remove and scrape
outexcesscarbon(Fig. 35)onbothinletandexitexhaust
or have this done by a service dealer. Replace exhaust
spark arrestor if worn, broken or blocked (Fig 36).
TROUBLE SHOOTING TIPS
Engine will not run or
runs and stops. 1. Ignition switch is OFF. 2. Choke ON.
3. Partially empty fuel tank.
4. Primer bulb not pushed enough times.
5. Engine is flooded.
1. Turn switch on.
2. Push choke to OFF position.
3. Fill tank.
4. Press primer bulb fully and slowly 5 times.
5. Use starting procedure without choke.
Cutting blade does not
turn when operating. 1. Blade cover filled with dirt/grass. 2. Clutch slipping.
3. Loose bladenut.
4. Choke partly on.
5. Washers missing.
6. Spacers or parts missing.
1. Clean.
2. Cut less depth. Check blades are rotating.
Edge at full throttle
3. Tighten bladenut.
4. Push choke to OFF position.
5. Re-fit washers.
6. Re-fit missing parts.
Gear case leaking 1. Loose screws.
2. Broken O-ring.
3. Grease too thin or oil used.
1. Tighten.
2. Replace.
3. Refill with correct grade grease. See pg 13.
Noisy gears 1. No lubricant in gearcase.
2. Loose bladenut or gear adjustment
incorrect.
1. Refill.
2. Reassemble parts correctly.

14
34 44006 NUT 1/4" BSW (refer Key # 41)
35 44010 PRO THROTTLE CABLE ASSY
36 44012 CORRUGATED LOOM 400mm
37 44035 WHEEL BUSH ROUND
38 44062 HANDLE CROSS BRACE
39 44064 HANDLE BOLT HEX PIECE BLACK
40 44074 HANDLE BOLT 1/4" X 6" BSW
41 44075 BLACK HANDLE KNOB with 1/4" nut
42 44078 LARGE WHEEL SEAL
43 44085 TRIGGER COVER W/OUT SLOT
44 44440 ROCKER ON/OFF SWITCH
45 47000 MAIN BODY RED
46 47001 MAIN HOUSING/BLADE COVER
47 47002 BLADE GUARD LID
48 47003 GRASS FLAP LIMITER
49 47004 GRASS FLAP
50 47005 HEIGHTADJUST HANDLE
51 47006 HEIGHTADJUST PIN
52 47007 WHEELARM
53 47008 MAIN BODY DUST PLUG
54 47009 ENGINE MOUNT
55 48004 HONDA GX-25 ENGINE
56 50098 C.BEARING 32x10x12 W/SEAL
57 44060 RIGHT HANDLE TUBE
58 44061 LEFT HANDLE TUBE
59 50660 LABEL MODEL 550
60 44087 THROTTLE TRIGGER ASSY.
61 43227 GREASE & DISPENSER
62 43935 CABLEADJUSTER PIN (NOT SHOWN)
63 50594 MANUAL MODEL 550
64 43759 WHEELASSY. COMPLETE
65 50652 DELUXE LABEL
66 43966 HONDAAIR DEFLECTOR (GX25)
67 47009 ENGINE MOUNT SCREWS 6X16mm
KEY # PART # DESCRIPTION
KEY # PART # DESCRIPTION
1 40650 SCREW M5 x 36mm
2 40652 NUT NYLOC 5mm
3 40906 “O” RING 64 x 1.75mm
4 43112 BLADE DRUM
5 43114 BLADE SHAFT DRIVE
6 43115 BLADE WASHER SMALL
7 43116 BLADE WASHER LARGE
8 43089 BLADE SET 10.7"MM X 1.6MM
9 43128 WARNING LABELBLADE COVER
10 43133 WARNING LABEL HANDLE
11 43163 FLANGE NUT 3/8 UNC
12 43173 NUT M12 X 1.75
13 43176 PINION GEAR LONG 25.4mm
14 43198 TRIGGER COMP.SPRING
15 43199 SPRING,SMALL
16 43245 CROWN GEAR WITH BUSH
17 43288 THROTTLE TRIGGER
18 44318 CLUTCH DRUM CUP 54mm
19 43292 THROTTLE INTERLOCK
20 44083 PINION BEARING PIN
21 43452 HT.ADJ.ARM COMP SPRING
22 43484 WASHER 22.43 x 5.94 Z/P
23 43719 DEBRIS DEFLECTOR SPRING
24 44057 MAIN SHAFT
25 43765 WHEEL ONLY
26 43790 SCREW 5.5mm for plastic
27 43860 BEARING 32x10x12 + 4mm
28 43865 BEARING 37x12x12 + 2.5mm
29 43922 RUBBER HANDLE GRIP
30 43961 PRO L.H HANDLE
31 43963 RH HANDLE SUIT RUBBER GRIP
32 44165 SWITCH WIRE 505/506 550 HONDA
33 43980 FLANGE BUSH SPACER
lll ATOM MODEL 550 DELUXE LAWN EDGER PARTS LIST

15
lll ATOM MODEL 550 DELUXE LAWN EDGER PARTS LIST

!NOTE This information is for persons with suitable experience should this unit ever require
workshop repair.
16
COMPLETE WORKSHOP MANUAL
!NOTE If shaft is difficult to knock out,
remove complete main body
bearing cover housing (see
p.17, Removing Gear Assembly Shaft).
TO REPAIR THROTTLE TRIGGER
ASSEMBLY
1. Remove 2 screws
holding side cover
and remove cover
and all parts.
Reassemble as
follows.
2. Fit throttle
inter-lock and
compression
spring
(Fig 37).
3. Fit throttle
trigger with
top hook
#43288 and
throttle trigger
compression
spring #43198, fit
trigger then
compression
spring (Fig 38).
4. Hold trigger in place with finger until throttle cover
#44069isfitted(Fig 39).Itisthenreadyforscrewing
tight (with 2 screws). Ensure throttle cover rear lug
(arrowedFig. 39)engagesundersideofhandlewall.
TO REPLACE BLADE SHAFT
1. After removing blades (Refer Pg 10, Figs 25, 26
and 27) remove blade drum #43112, felt seal
#42112 and spring level washers #43115. Inspect
threadedendofshaftandfileoffanyroughsurfaces
so shaft is round and smooth.
2. Hold unit as
shown in
Fig. 40 and tap
shaft through
using a 3/8 bolt
or similar so
that bolt
replaces shaft
and maintains
alignment and
contains
washers,
spacer and
gear inside
housing –
DO NOT TURN HOUSING OVER.
TO REMOVE ENGINE
1. Use a No.25 Torx Screwdriver, loosen 2 screws
(A) located in 2 holes and 1 screw (B) (Fig. 42).
2. Pull engine away from body (Fig. 43). It is NOT
necessary to remove handles.
3. Carefully push new
blade shaft #43114
up into bearing and
tap through carefully
so washers, crown
gear and spacer
remain in position
and the 3/8 bolt is
pushed out (Fig. 41).
4. When blade shaft
comes through, turn assembly over. Tap blade
shaft so head of shaft is against bearing.
5. Re-assemble in reverse order all parts listed in 1.
above. Refit blade (as per instructions on Pg 10,
Figs 25, 26 and 27) and tighten up to 15-20 ft lbs
(20-27Nm) or hand tight with 8” (200mm) or larger
spanner. Head of blade shaft must pull up tight
against bearing, otherwise blade will become
loose during use.

17
COMPLETE WORKSHOP MANUAL (CONTINUED)
TO REMOVE GEAR ASSEMBLY
AND MAIN DRIVE PINION SHAFT
1. Remove blade cover as shown in Fig 28, page 11.
2. Remove 6 screws holding main bearing housing
(Fig 47) shown marked. Remove bearing holding
pinA by pushing out.
!NOTE DO NOT USEASTEEL DRIFT as
a punch as you will damage the
pinion teeth.
3. Turn edger over to remove dust cover (refer
Fig 25, page 10).
TO REMOVE WHEEL ARM
1. Remove blade cover lid by lifting and tapping in a
clockwise direction (Fig. 44)
2. Remove one screw and washer through hole in
blade cover (Fig. 45). Pull wheel arm assembly out
of edger body.
TO REMOVE CLUTCH DRUM
1. Slide long thin screw through hole in clutch drum
andribsinbodycasing.Unscrewflangednutinanti-
clockwise direction Fig 46.
2. Replaceclutchdrumwithnewclutchdrumkitifworn
or out of round. fit and retighten.
4. With a soft punch, tap hex end blade shaft as in
Fig 48 until cover and gear assembly pops out of
body housing.
5. If service tool available, remove shaft after fixing
to main casing with existing screws and screwing
out (Fig 49).
6. If no service tool
available, use a
screwdriver to lever
pinion back. Turn
screwdriver on end to
lever further.
Fig 50 & 51.
7. With a copper or brass
punch (7/16” or
10mm in diameter)
about 10” long,
hold housing and
tap pinion shaft out
Fig 52.

COMPLETE WORKSHOP MANUAL (CONTINUED)
18
!NOTE Bearing must be forward to
allow pinion bearing pin to be
fitted, then pinion and bearing forced back onto
pinion bearing pin. If this is not done, pinion or
crown gear could be tight. Correct distance is
6mm (.236”) Fig. 58.
TO REMOVE PINION
1. Hold shaft in vice
between two pieces of
aluminium so as not to
damage shaft.
2. To remove pinion, grip
shaft just behind bearing
in jaws of vice (Fig. 53)
and unscrew pinion
counter (anti) clockwise
(normal thread) with vice
grips. If tight, heat to
break loctite seal.
3. Fit new pinion on thread,
making sure it is tight up
to bearing (Fig. 54).
5. Fit pinion bearing pin (See Fig. 47 marked A).
6. Using a screwdriver, lever pinion firmly back onto
pinion bearing pin (Fig. 51 & 52).
4. To remove clutch drum, grip shaft just behind
bearing in aluminium vice jaws and impact off with
14mm (9/16”) hex socket. See Page 17 for
replacement of drum.
ASSEMBLING MAIN HOUSING
1. Clean and dry bearing. Place oil resistant gasket
sealant (e.g. Fullerprene 303) around bearing as
in Fig. 54.
2. Place and lock-
up a 15mm
diameter
(approx.) brass
drift vertically in
a vice (Fig. 55).
3. Hold centre of
clutch drum nut
on top of drift
and slide main
body housing
down over shaft
(Fig. 56).
4. With a soft
hammer, tap
casing down
until it bottoms
on pinion
bearing
(Fig. 56).
7. Replace
crown gear if
teeth are
worn. See
sequence
of assembly
(Fig. 59).
8. Check and
renew O’ ring #40906 if necessary. Fit assembly
into housing. If bearing is loose in housing, smear
loctite around bearing before assembling.
Carefully drive down (making sure gears are
meshing) by gently tapping around bearing area
(Fig. 58) and turning clutch drum. Refit 6 screws
around shaft.
9. Fill or top up with
gear lubricant.
See Page 11
“LUBRICATION
OF GEARS”.
10. Fit blade (see
page 10) and
bearing cap
and check
rotation that
gears are not
binding. It
should turn
smoothly from
clutch end.
Backlash at end
of blade about
2-4mm. Refit blade
cover lid, engine,
handles and test.

19
!NOTE Re-assemble with clutch shoe
arrows pointing anti-clockwise
in direction of rotation as viewed from front of
engine Fig. 60.
TO REPAIR CLUTCH
Replace these parts if the Clutch spring is broken, the
Clutch fibre is worn or the Clutch bolt or shoe holes are
worn.
COMPLETE WORKSHOP MANUAL (CONTINUED)

DATE OF PURCHASE:
PURCHASEDBY:
Address
State: Post/Zip Code:
SOLDBY:
Address:
State Post/Zip Code:
Atom warrants each newAtom Edger Model for ONE YEAR for residential use and 90
daysfor commercial usebasedonthe following terms.
Thewarrantyextendstotheoriginalretailpurchaseronlyandcommencesonthedateof
theoriginalretailpurchase.
AnypartoftheAtomEdgermanufactured orsuppliedbyAtomandfoundinthereasonable
judgementofAtomtobe defective in material orworkmanshipwillberepairedorreplaced
byanauthorizedAtomservicedealer without chargeforpartsandlabour.
TheAtomEdger,including any defectivepart,mustbe returned to anauthorized service
dealer within the warranty period. The expense of delivering the Atom Edger to the
dealerforwarrantywork and the expenseof returningit backto theowner afterrepairor
replacement will be paid for by the owner.Atom’s responsibility in respect to claims is
limitedtomakingtherequiredrepairsorreplacementsandnoclaimofbreachofwarranty
shallbe cause forcancellationorrescission of theContractofSale of anyAtomEdger.
Proof of purchase will be required by the dealer to substantiate any warranty claim.All
warrantywork must beperformedby anauthorizedAtomservice dealer orbyAtom.
Thiswarrantyis limited to NINETY(90) days from thedate oforiginalretailpurchasefor
any Atom Edger that is used for commercial purposes and ONE (1) month for rental
purposes.
Thiswarrantydoesnot cover anyAtomEdgerthathasbeensubject to misuse, neglect,
negligenceor accident, orthathasbeen operated inanywaycontrary to theoperating
instructionsasspecifiedintheAtom Operator’sManual.This warrantydoes not applyto
anydamagetotheAtomEdgerthat is the result of impropermaintenance or to anyAtom
Edgerthathasbeenalteredormodifiedsoastoadverselyaffecttheproduct’soperation,
performanceordurabilityorthathas been alteredormodifiedsoastochangeitsintended
use.Thewarrantydoesnotextend to repairs madenecessary bynormal wearor bythe
useofpartsoraccessorieswhichareeitherincompatiblewiththeAtomEdgeroradversely
affectitsoperation, performanceor durability.
Atom reserves the right to change or improve the design of any Atom Edger without
assuminganyobligation to modifyany productpreviouslymanufactured.
ALL IMPLIED WARRANTIES ARE LIMITED IN DURATION TO THE ONE YEAR
WARRANTY PERIOD OR NINETY (90) DAYS FOR PRODUCTS USED FOR ANY
COMMERCIAL PURPOSE AND ONE (1) MONTH FOR RENTAL PURPOSES.
ACCORDINGLY, ANY SUCH IMPLIED WARRANTIES, INCLUDING
MERCHANTABILITY,FITNESS FORAPARTICULARPURPOSE,OR OTHERWISE,
ARE DISCLAIMED IN THEIR ENTIRETY AFTER THE EXPIRATION OF THE
APPROPRIATETWELVE(12)MONTHSORTHIRTY(30) DAYWARRANTYPERIOD.
ATOM’SOBLIGATIONUNDERTHISWARRANTYIS STRICTLYAND EXCLUSIVELY
LIMITEDTOTHE REPAIROR REPLACEMENTOF DEFECTIVE PARTSANDATOM
DOES NOT ASSUME OR AUTHORIZE ANYONE TO ASSUME FOR THEM ANY
OTHER OBLIGATION. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW
LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT
APPLYTO YOU.
ATOMASSUMESNO RESPONSIBILITYFOR INCIDENTAL,CONSEQUENTIALOR
OTHERDAMAGESINCLUDING,BUTNOTLIMITEDTO,EXPENSE OFRETURNING
THE ATOM PRODUCT TO AN AUTHORIZED SERVICE DEALER AND EXPENSE
OF DELIVERING IT BACK TO THE OWNER, MECHANIC’S TRAVEL TIME,
TELEPHONEORTELEGRAMCHARGES,RENTALOFALIKE PRODUCT, DURING
THE TIME WARRANTY SERVICE IS BEING PERFORMED, TRAVEL, LOSS OR
DAMAGE TO PERSONAL PROPERTY, LOSS OF REVENUE, LOSS OF USE OF
THE PRODUCT, LOSS OR TIME, OR INCONVENIENCE. SOME STATES DO NOT
ALLOWTHEEXCLUSIONORLIMITATIONOF INCIDENTALOR CONSEQUENTIAL
DAMAGESSOTHEABOVELIMITATIONOREXCLUSIONMAYNOTAPPLYTOYOU.
Thiswarranty gives youspecificlegalrights,and you mayalsohaveother rightswhich
vary from state to state.
Thiswarrantyapplies toAtom Edger ModelmanufacturedbyAtom.
Forwarranty procedurefor Hondaengine pleaserefer toseparateenginewarrantyavailablefromyournearestauthorisedHondadealerwho willalso carryout
anyengine servicerequired.
IMPORTANT: PLEASE FILL OUT THE INFORMATION BELOW ON PURCHASE
Atom Edgers are manufactured inAustralia and exported around the world.
Aust. Patent No. 678575.
US Patent No’s 5, 826, 667 & 6,116, 350.
OtherAustralian and US Patents pending. Patent Pending in Europe, Japan and elsewhere.
Design registrations granted inAustralia, USA, Japan and Great Britain.
Patents pending on Cross-Blade system.
Operator Manual. Part No. 50594. Printed in Australia.
Copyright © 2005 Atom Industries. All rights reserved
Atom Industries
9 Fred Street, Lilyfield NSW 2040 Australia
PO Box 513, Rozelle NSW 2039 Australia.
Phone: [phone] • International: ([phone]
Fax: [phone] • International: ([phone]
Email: [email protected]
Atom Industries is a division of Solo Industries Pty Ltd
(ACN 000 583 924).
Patents and registrations granted and pending.
webside:www.atomindustries.com.au
Atom Industries (NZ) Limited
PO Box 23500 Papatoetoe,Auckland New Zealand.
Freecall 0800 174 753
Freefax 0800 603 403
Email: [email protected]
Patents and registrations granted and pending.
webside:www.atomindustries.co.nz
Keepthismanualasproofofpurchase.Thisisyour
Lawn Edger machine model number. Should you
ever require any parts, please quote these
numbers.