Page 1
PATENTED WORLD’S BEST
LAWN EDGERS
Model 550
Deluxe
Honda Powered 25cc 4-S troke
Gasoline Model
OPERA T OR/OWNER
MANU AL
● Safety Precautions
● 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 CAREFULL Y
UNDERSTOOD
BEFORE ST ARTING
OR OPERA TING
THIS EQUIPMENT
NOTE: For full “Honda” engine instructions and maintenance please refer to separate
“Honda Owners Manual” supplied.
IMPORT ANT MANUAL – DO NOT THRO W 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
✔
Page 2
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.
T o receive maximum performance and satisfaction from
your Lawn Edger, it is important that you read and
understand the maintenance and safety precautions
before using the edger. Cont act your Atom 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 (02) 9810 0194
(within Australia) for your nearest servicing dealer.
NOTE: OUTSIDE AUSTRALIA REFER TO BACK
COVER P AGE.
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 T ip s......................................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
lawn edger body . For full Honda engine 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 & CONTR OLS
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.
4 ON/STOP switch.
5 Starter grip the grip of the pull starter which is the
device to start the engine.
6 Handle nut for holding handles onto housing.
7 Height adjustment for adjusting depth of cutting
blade.
8 Blade cover reduces the risk of flying debris and
direct contact with the feet or hands.
9 Sight 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.
Page 3
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 PRECA UTIONS
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
precautions must be observed to reduce the risk
of personal injury . Careless or improper use may
cause serious or even fatal injury.
Safe use of an Atom Lawn Edger involves:
1. The Operator
2. The Atom Edger
3. The use of the Atom 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 INJUR Y
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 •
KEEP BYSTANDERS A T LEAST 50FT (16M) AWAY • A LWAYS 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.
ROTA TING BLADE
DIRECTION OF ROTA TION
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
Page 4
4
SAFETY PRECAUTIONS (CONTINUED)
Prolonged use of any
hand-held powered
machine exposing the operator to vibrations
may produce whitefinger disease (Raynaud’s
phenomenon) or carpal tunnel syndrome. 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 pant s, or anything
that could trip the operator. W ear 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
may not protect the operator from all fast 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
Edger unless wearing goggles or 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 (ear plugs or ear mufflers) to protect your hearing.
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
and allow it to cool before refueling. Relieve fuel tank
pressure by loosening fuel cap slowly . Never remove
fuel filler cap while engine is running.
Select bare ground for fueling, then move at least 3
metres (10 feet) from the fueling spot before starting the
engine. Wipe off any spilled fuel before starting your Atom
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.
Tiredness may result in loss of control. W orking with any
power tool can be strenuous. If you have any condition
that might be aggravated by strenuous work, 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
reduce the risk of eye or other injury from thrown
objects, ensure that bystanders are at least 15
metres (50 feet) away during use. Replace
immediately any worn or broken debris deflector
shield or blade cover. If approached, release
throttle trigger to immediately de-accelerate the
engine.
!
WARNING
Page 5
5
SAFE WORKING INSTRUCTIONS
AND IMPORTANT ADJUSTMENTS
Never operate your machine if it is damaged, improperly
adjusted or not completely and securely assembled. At
correct idle speed, the blade should not turn. Do not use
the Atom Edger with incorrect idle speed (refer Adjusting
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
section of this manual. Any repairs should be carried out
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
Remember that the risk of forest or grass fires is greater
in hot weather.
Check fuel filler cap for leaks at regular intervals. Use
the specified spark plug and make sure it and the ignition
lead are always in good condition.
Never touch a hot muffler
as burns will result.
!
WARNING
Store Atom 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
Before storing for a longer period, always empty the fuel
tank.
Keep the space behind and beside the engine clear at
all times to allow for the escape of hot and toxic exhaust
fumes.
Operate your machine under good visibility and daylight
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.
Page 6
D ANGER!
FUEL IS EXTREMEL Y FLAMMABLE. HANDLE IT
WITH CARE. KEEP AWAY FROM IGNITION
SOURCES. DO NOT SMOKE WHILE FUELING
YOUR EQUIPMENT .
Always allow engine to
cool before refueling.
Accidental spillage of gasoline 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.
Y our Atom Edger is powered by a four-stroke, air cooled
engine which requires unleaded gasoline only in the fuel
tank.
NOTE: Do not mix oil with the gasoline.
Only use sufficient fuel for a few weeks work and store in
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. A void direct contact with the
skin and avoid inhaling fuel vapor.
!
WARNING
!
WARNING
!
WARNING
!
WARNING
ASSEMBLING THE lll AT OM LAWN EDGER
6
Before fueling the edger, clean the filter cap and the area
around it to ensure that no dirt falls into the tank.
ENGINE OIL LEVEL
1. Remove the oil filler cap and fill tank with oil container
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.
Page 7
Fill or add fuel to the tank
only when the edger is in
a horizontal position as shown (Fig. 9). Allow
engine to cool down for at least 5 minutes before
adding fuel. Use fuel funnel (not supplied) to
prevent spills.
ST ARTING & ST OPPING 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. 1 1).
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. St and between handles to start. Do not let
starter grip snap back. Guide it back slowly so that the
starter rope can rewind slowly.
Page 8
8
ST ARTING & ST OPPING INSTRUCTIONS (CONTINUED)
1. The Atom Edger is very easy and simple to 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
operated by pushing down interlock with thumb and
pulling on trigger (Fig. 14).
TO AVOID PERSONAL
INJURY, NEVER CARRY
THE EDGER WHILE THE ENGINE IS RUNNING.
Stay clear of the rot ating blade. Stop the engine
prior to making adjustments and cleaning.
!
WARNING
EDGING INSTRUCTIONS
7. HOT OR WARM ST AR T : (Engine has already been
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. FLOODED ENGINE: (Engine will not start). If smoke
or fuel comes from exhaust and engine will not start.
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).
AFTER FINISHING WORK
Storing for a short period: Keep the unit 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.
Page 9
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,
adjust blade height, or slightly raise or lower handles
to suit depth required (Fig. 17). However, it is always
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: When cutting efficiently , 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, lower handles and re-position blade at side
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
concrete edge and acts as a guide (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.
Page 10
MAINTENANCE INSTRUCTIONS
EDGING INSTRUCTIONS (CONTINUED)
USE ONL Y A TOM BLADES.
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. Stop engine. Clean area 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. Through dust cover hole, place 14mm (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
with spiggots of one blade interlocking with holes on
opposite blade, large washer, one small washer , and
nut. Tighten nut to 15-20 ft. lbs. (20-27Nm) or hand
tight with 8” (200mm) or longer spanner.
TO A VOID
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.
Page 11
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
OPERA TION OR DAIL Y.
!
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 REMO VE 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
There is usually sufficient grease to last at least 6 months
or 125 hours for professional use before topping it up.
The grease in the gear case should be added according
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
in 3 to 4 more lots of grease. Refit FILL screw and tighten.
NOTE: Do not use light or heavy gear oil 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 SP ARK PLUG
Remove engine cover by unscrewing 1x5mm hex bolt
at top of cover (Fig 30). Remove spark plug cap and
unscrew spark plug. If engine is low on power, dif ficult to
start or runs poorly at idling speed, check the spark plug.
● 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.
– T oo much oil in oil t ank.
– Old fuel.
– Dirty air filter.
– Unfavourable running conditions (e.g. operating
at part load).
Do not clean the spark plug in an abrasive grit spark
plug cleaner, as expensive damage to the engine
could occur through loose grit damaging chrome in
cylinder bore.
Fit a new spark plug after approximately 100 operating
hours or earlier if electrodes are badly eroded.
AIR FILTER MAINTEN ANCE
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
Page 12
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-ofadjustment carburettor. Therefore, check the condition
of the air filter before adjusting the carburettor. Refer to
Air Filter Maintenance on page 11. If the following
conditions are experienced, it may be necessary to adjust
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
increase engine idle speed, turn IDLE SCREW (#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
The throttle cable normal play is .040” to .080” (1 to 2mm)
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.
Page 13
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
out excess carbon (Fig. 35) on both inlet and exit exhaust
or have this done by a service dealer. Replace exhaust
spark arrestor if worn, broken or blocked (Fig 36).
TROUBLE SHOO TING 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.
Page 14
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 HEIGHT ADJUST HANDLE
51 47006 HEIGHT ADJUST PIN
52 47007 WHEEL ARM
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 CABLE ADJUSTER PIN (NOT SHOWN)
63 50594 MANUAL MODEL 550
64 43759 WHEEL ASSY. COMPLETE
65 50652 DELUXE LABEL
66 43966 HONDA AIR 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 LABEL BLADE 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 A T OM MODEL 550 DELUXE LAWN EDGER PARTS LIST
Page 15
15
lll A T OM MODEL 550 DEL UXE LAWN EDGER PARTS LIST
Page 16
!
NOTE
This information is for persons with suitable experience should this unit ever require
workshop repair .
16
COMPLETE WORKSHOP MANU AL
!
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
ASSEMBL Y
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
#44069 is fitted (Fig 39). It is then ready for screwing
tight (with 2 screws). Ensure throttle cover rear lug
(arrowed Fig. 39) engages underside of handle wall.
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
threaded end of shaft and file off any rough surfaces
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.
Page 17
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
pin A by pushing out.
!
NOTE
DO NOT USE A STEEL 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 REMO VE CLUTCH DR UM
1. Slide long thin screw through hole in clutch drum
and ribs in body casing. Unscrew flanged nut in anticlockwise direction Fig 46.
2. Replace clutch drum with new clutch drum kit if worn
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.
Page 18
COMPLETE WORKSHOP MANU AL (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 lockup 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.
Page 19
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 MANU AL (CONTINUED)
Page 20
DATE OF PURCHASE:
PURCHASED BY:
Address
State: Post/Zip Code:
SOLD BY:
Address:
State Post/Zip Code:
Atom warrants each new Atom Edger Model for ONE YEAR for residential use and 90
days for commercial use based on the following terms.
The warranty extends to the original retail purchaser only and commences on the date of
the original retail purchase.
Any part of the Atom Edger manufactured or supplied by Atom and found in the reasonable
judgement of Atom to be defective in material or workmanship will be repaired or replaced
by an authorized Atom service dealer without charge for parts and labour .
The Atom Edger , including any defective part, must be returned to an authorized service
dealer within the warranty period. The expense of delivering the Atom Edger to the
dealer for warranty work and the expense of returning it back to the owner after repair or
replacement will be paid for by the owner. Atom’ s responsibility in respect to claims is
limited to making the required repairs or replacements and no claim of breach of warranty
shall be cause for cancellation or rescission of the Contract of Sale of any Atom Edger .
Proof of purchase will be required by the dealer to substantiate any warranty claim. All
warranty work must be performed by an authorized Atom service dealer or by Atom.
This warranty is limited to NINETY (90) days from the date of original retail purchase for
any Atom Edger that is used for commercial purposes and ONE (1) month for rental
purposes.
This warranty does not cover any Atom Edger that has been subject to misuse, neglect,
negligence or accident, or that has been operated in any way contrary to the operating
instructions as specified in the Atom Operator’s Manual. This warranty does not apply to
any damage to the Atom Edger that is the result of improper maintenance or to any Atom
Edger that has been altered or modified so as to adversely affect the product’s operation,
performance or durability or that has been altered or modified so as to change its intended
use. The warranty does not extend to repairs made necessary by normal wear or by the
use of parts or accessories which are either incompatible with the Atom Edger or adversely
affect its operation, performance or durability .
Atom reserves the right to change or improve the design of any Atom Edger without
assuming any obligation to modify any product previously manufactured.
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 FOR A P ARTICULAR PURPOSE, OR OTHERWISE,
ARE DISCLAIMED IN THEIR ENTIRETY AFTER THE EXPIRATION OF THE
APPROPRIATE TWEL VE (12) MONTHS OR THIR TY (30) DA Y W ARRANTY PERIOD.
ATOM’S OBLIGA TION UNDER THIS W ARRANTY IS STRICTL Y AND EXCLUSIVEL Y
LIMITED TO THE REP AIR OR REPLACEMENT OF DEFECTIVE P ARTS AND A TOM
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
APPLY T O YOU.
AT OM ASSUMES NO RESPONSIBILITY FOR INCIDENT AL, CONSEQUENTIAL OR
OTHER DAMAGES INCLUDING , BUT NOT LIMITED T O, EXPENSE OF RETURNING
THE ATOM PRODUCT TO AN AUTHORIZED SERVICE DEALER AND EXPENSE
OF DELIVERING IT BACK TO THE OWNER, MECHANIC’S TRAVEL TIME,
TELEPHONE OR TELEGRAM CHARGES, RENTAL OF A LIKE 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 STA TES DO NOT
ALLOW THE EXCLUSION OR LIMITA TION OF INCIDENT AL OR CONSEQUENTIAL
DAMAGES SO THE ABOVE LIMIT A TION OR EXCLUSION MA Y NOT APPL Y T O YOU.
This warranty gives you specific legal rights, and you may also have other rights which
vary from state to state.
This warranty applies to Atom Edger Model manufactured by Atom.
For warranty procedure for Honda engine please refer to separate engine warranty available from your nearest authorised Honda dealer who will also carry out
any engine service required.
IMPORT ANT: PLEASE FILL OUT THE INFORMATION BELOW ON PURCHASE
Atom Edgers are manufactured in Australia and exported around the world.
Aust. Patent No. 678575.
US Patent No’s 5, 826, 667 & 6,116, 350.
Other Australian and US Patents pending. Patent Pending in Europe, Jap an and elsewhere.
Design registrations granted in Australia, USA, Japan and Great Brit ain.
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: (02) 9810 0194 • International: (+61) 2 9810 0194
Fax: (02) 9810 6691 • International: (+61) 2 9810 6691
Email: info@atomindustries.com.au
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: info@atomindustries.com.au
Patents and registrations granted and pending.
webside: www.atomindustries.co.nz
Keep this manual as proof of purchase. This is your
Lawn Edger machine model number. Should you
ever require any parts, please quote these
numbers.
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