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PETROL DEMOLITION
CONCRETE SAW
CTPTDCSAWA
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IMPORTANT!
Read this instruction manual carefully before putting the Certa Concrete Saw into operation
and strictly observe the safety regulations!
Keep this instruction manual!
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WARNING!
Ensure this user guide is read and understood before operation. Always follow safety
precautions outlined in this user guide. Improper use can cause serious injury.
Retain this user guide for future reference.
WARNING!
• FUELS WITH MORE THAN 10% ETHANOL ARE NOT APPROVED FOR USE IN 2STROKE ENGINES!
• Use of alternative fuels, such as E-20 (20% ethanol), E-85 (85% ethanol) or any
fuels not meeting requirements is not approved for use in 2-stroke petrol engines.
• USE OF ALTERNATIVE FUELS CAN CAUSE THE FOLLOWING ISSUES:
Poor engine performance, loss of power, overheating, fuel vapour lock, improper
clutch engagement, premature deterioration of fuel lines, premature deterioration
of gaskets, premature deterioration of carburettors.
• USING ALTERNATIVE FUELS AND/OR 2-STROKE OILS NON-COMPLIANT TO
JASO FC OR ISO-L-EGD STANDARDS WITH THIS PRODUCT WILL VOID YOUR
ENGINE WARRANTY!
Read this user guide carefully before operating the Certa Petrol Demolition
Concrete Saw for the first time, and strictly observe the safety regulations!
Failure to observe these precautions can lead to severe injury or death!
WARNING!
The ignition system of the Certa Petrol Demolition Concrete Saw produces an
electromagnetic field. This field may interfere with some medical devices (such as
pacemakers). To reduce the risk of serious or fatal injury, people with medical devices should
consult with their physician before operating this equipment.
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Symbols
User guide
this guide.
Combination switch
You will notice the following symbols on the Certa Petrol Demolition Concrete Saw and in
this user guide:
Ensure you have read and are
following the instructions, warnings
and safety precautions outlined in
Cutting disc dimensions
Attention and caution required
Forbidden
Wear a helmet!
Wear eye, respiratory and hearing
protection!
Wear protective gloves!
Wear respiratory protection!
Hazardous dust and/or gas
emission!
Fire hazard from flying sparks!
No smoking!
Never use circular saw blades!
Never use a damaged cutting
disc
Choke, on/stop
Safety position
Start engine
Stop engine
Warning: Kickback
Fuel and oil mixture
First aid
No open fire!
On/off cutting wheel rotation
Warning: The maximum peripheral
speed of the cutting disc is 80 m/s!
Recycling
Do not touch hot surfaces!
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Intended use
The illustrations here are for reference only and not identical to the product.
Safety Precautions:
Note:
Intended use:
Certa Petrol Demolition Concrete Saw
Use the Certa Petrol Demolition Concrete cut-off saw outdoors only for trimming and
cutting suitable materials, using cutting discs rated for this machine.
Improper use:
Never use the cut-off saw cutting discs for grinding or sanding (using the side of the cutting
disc to remove material). The disc can break! Never use the Certa Petrol Demolition
Concrete Saw with saw blades cutter blades, brushes, carbide tipped, wood cutting blades
etc.
Unauthorised users:
Persons unfamiliar with the user guide, children, young people and persons under the
influence of alcohol, drugs or medications must not use the Certa Petrol Demolition
Concrete Saw.
General precautions
• The operator MUST read this user guide to
ensure safe operation (even if you already
have experience in using cut-off saws).
1
It is
important to be familiar specifically with the
operation of the Certa Petrol Demolition
Concrete Saw. Users insufficiently informed will
endanger themselves as well as others due to
improper handling.
• Let only persons who have experience in using cut-off saws work with this unit. When
letting another person use the Certa Petrol Demolition Concrete Saw, this user guide
must be provided along with it.
• First-time operators should ask a specialist to instruct them in working with petrol-
powered cut-off saws.
• Children and persons under 18 years of age must not be allowed to use this Certa
Petrol Demolition Concrete Saw. Persons over the age of 16 years may, however, use
the saw to be trained as long as they are under the supervision of a qualified trainer.
• Working with the Certa Petrol Demolition Concrete Saw requires high concentration.
• Operate the Certa Petrol Demolition Concrete Saw only if you are good physical
condition. If you are tired, your attention will be reduced. Be especially careful at the
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end of a working day. Perform all work calmly and carefully. The user has to accept
liability for others.
• Never work while under the influence of alcohol,
drugs, medication or other substances which
may impair vision, dexterity or judgement.2
• A fire extinguisher must be available in the
immediate vicinity when working in easily
inflammable vegetation or when it has not
rained for a long time (danger of fire).
• Asbestos and other materials that can release
toxins may be cut only with necessary salty precautions and after notification of the
proper authorities and under their supervision or that of a person appointed by them.
• The use of dust-reduction devices is urgently recommended (see Accessories pressure
water tank, water tank).
Protective Equipment
• To avoid head, eye, hand or foot injuries as well
as to protect your hearing the following
protective equipment must be used during
operation of the Certa Petrol Demolition
Concrete Saw: When using personal protective
equipment, ensure compliance with ANSI Z87,
1!
• The kind of clothing should be appropriate, i.e.
it should be tight-fitting but not be a hindrance.
Clothing in which grains of material can
accumulate (trousers with cuffs, jackets and
trousers with wide-open pockets, etc.) must not
be worn, particularly when cutting metal.
• Do not wear any jewellery or clothing that can
get caught or distract the operation of the
Certa Petrol Demolition Concrete Saw.
• It is necessary to wear a protective helmet
whenever working with the Certa Petrol
Demolition Concrete Saw. The protective
helmet (A) is to be checked in regular intervals
for damage and is to be replaced after 5 years
at the latest. Use only approved protective
helmets.
• The helmet visor (B) protects the face from dust
and Material grains. To prevent injuries to eyes
and face, always wear protective goggles (C) or
visor when using the Certa Petrol Demolition Concrete Saw.
• To prevent hearing damage always wear suitable personal hearing protection.
(Earmuffs (D), earplugs, etc.). Octave brand analysis upon request. -When dry-cutting
dust-producing materials such as stone or concrete, always wear approved respiratory
protection (E).
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• Work gloves (F) of tough leather are part of the required work kit of the Certa Petrol
Demolition Concrete Saw and must always be worn when working with the Certa
Petrol Demolition Concrete Saw.
• Always wear safety shoes or boots (G) with steel toes, non-skid soles and leg protectors
when working with the Certa Petrol Demolition Concrete Saw. Safety shoes equipped
with a protective layer protect against cuts and ensure a secure footing.
• Always wear a work suit (H) of tough material with sufficient flame-retardant qualities
whenever working with the cut-off saw.
Fuels/ Refuelling
• Go to a safe, level place before refuelling.
Never refuel while on scaffolding, on heaps
of material or in similar places!
• Switch off the engine before refuelling the
Certa Petrol Demolition Concrete Saw.
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• Do not smoke or work near open fires.
• Let the engine cool down before refuelling.
• Fuels can contain substances similar to solvents. Eyes and skin should not come in
contact with mineral oil products. Always wear protective gloves when refuelling (not
the regular work gloves). Frequently clean and change protective clothes do not
breathe in fuel vapours. Inhalation of fuel vapours can be hazardous to your health.
• Do not spill fuel. If a spill occurs, clean off the Certa Petrol Demolition Concrete Saw
immediately. Fuel should not come in contact with clothes. If your clothes have come
in contact with fuel, change them at once.
• Ensure that no fuel oozes into the soil (environmental protection). Use an appropriate
base.
• Refuelling is not allowed in closed rooms. Fuel vapours will accumulate near the floor
(explosion hazard).
• Ensure to firmly tighten the screw cap of the fuel tank.
• Before starting the engine, move to a
location at least 3 meters (approx. 10 feet)
from where you fuelled the Certa Petrol
Demolition Concrete Saw,
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but not within
the extended swing range of the cutting disc
(direction of sparks).
• Fuel cannot be stored for an unlimited
period. Buy only as much as will be
consumed shortly.
• When making up the petrol/oil mixture, always put the oil in the mixing container first
and then the petrol.
• Use only approved and marked containers for the transport and storage of fuel.
• Keep fuel away from children!
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Putting into operation
= Wearing Protective
• Do not work on your own. There must be
someone around in case of an emergency
(within shouting distance).
• Observe all anti-noise regulations when
working in residential areas.
• Never use the Certa Petrol Demolition
Concrete Saw near Inflammable materials
Equipment
or explosive gases! The Certa Petrol
Demolition Concrete Saw can create
sparks leading to fire or explosion!
• Make sure that all persons within 30 meters
(100 feet), such as other workers, are
wearing protective gear (see “Protective
Equipment”).
8
Children and other
unauthorised persons must remain more
than 30 meters away from the working
area, Keep an eye out for animals as well.9
• Before starting work the Certa Petrol Demolition Concrete Saw must be checked for
perfect function and operating safety according to the prescriptions. In particular,
make sure that the cutting wheel is in good condition (replace immediately if tom,
damaged or bent), the cutting wheel is properly mounted, the protective hood is
locked in place, the hand guard is properly mounted, the V-belt has the proper tension,
the throttle moves easily and the half-throttle lock button functions properly, the grips
are clean and dry and the combination switch functions properly (Start/stop (l/0)
switch, choke). Visually inspect the muffler for damage and possible dirt in the muffler
area.
• Stan the Certa Petrol Demolition Concrete Saw only after complete assembly and
inspection. Never use the Certa Petrol Demolition Concrete Saw when it is not
completely assembled.
Cut-off discs
The protection hood must always be on! Change discs only with the engine off !
• There are two basic types of cut-off discs:
o For metal (hot cutting)
o For masonry (cold cutting)
WARNING!
Never use carbide tipped, circular saw blades or any kind of wood cutting blades. Never
cut any type of wood. Reactive forces can cause severe personal injury from blade
contact or thrown tips.
Note:
When using diamond cut-off discs, always make sure to observe the “direction of rotation”
markings. Diamond discs should only be used for cutting Masonry/brick/ concrete etc.
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• Cut-off discs are intended only for radial
loading, i.e. for cutting. Do not grind with the
sides of the cutting disc! This will break the
disc! 10
Caution!
Never change direction (turning radius less than 5
meters (16 feet), exert lateral (sideways) pressure or
tip the Certa Petrol Demolition Concrete Saw during
cutting!
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• Use a cutting disc only for cutting the
materials it is intended for. The proper type of
disc must be used, for either metals or
masonry.
• The arbour hole of the cutting disc must be an
exact fit with the arbour or shaft if the arbour
hole is larger, it must be fitted with an adapter
ring (available as an accessory).
• The cutting disc must be rated for freehand
cutting at up to 4370 rpm or 80 m/sec for 350
mm discs or up to 5100 rpm or 80 m/s for 300
mm discs. Use only cutting discs that comply
with EN 12413, EN 13236.
• The disc must be free of defects. Do not use
defective cutting discs.
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Always tighten the cutting disc mounting bolt to a torque of 30 Nm. Otherwise, the cutting
disc can twist.
• Before starting the cutting disc, make sure you have a steady footing.
• Put the Certa Petrol Demolition Concrete Saw
into operation only as described in this user
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Always place your left foot in the rear
guide.
handle and grasp the other handle firmly (with
thumb and fingers). Other starling methods are
not allowed.
• When starting the Certa Petrol Demolition
Concrete Saw it must be well supported and
securely held.
• The cutting disc must not be touching anything.
• If the cutting disc is new, test it by running it at least 60 seconds at top speed, when
doing this, make sure that no persons or body parts are in the extended swing range of
the disc, in case it is defective and flies apart.
• When working with the Certa Petrol Demolition Concrete Saw always hold it with both
hands.
• Take the back handle with the right hand and the tubular handle with the left hand
Hold the handles tightly with your thumbs facing your fingers.
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• Caution: When you release the throttle lever the disc will keep spinning for a short
• Refuelling
period (free-wheeling effect).
• Continuously ensure that you have a safe footing.
• Hold the Certa Petrol Demolition Concrete Saw such that you will not
breathe in the exhaust gas. Do not work in closed rooms or deep holes or
ditches (danger of poisoning by fumes).
• Warnin g: Carbon monoxide produced during use can kill-do not use Certa Petrol
Demolition Concrete Sawter indoors-make sure there is proper ventilation when using
Certa Petrol Demolition Concrete Saw in trenches or other confined spaces.
• Switch off the Certa Petrol Demolition Concrete Saw immediately if you observe any
changes in its operating behaviour.
• Switch oil the engine before inspecting the v-
belt tension or tightening it, replacing the
cutting wheel or eliminating faults.
• Turn off the engine immediately and check the
disc if you hear or feel any change in cutting
behaviour.
14
• Changing cut-off discs
• Stopping work
• Transport
• Putting out of function
• Mainte nance
• Turn off the Certa Petrol Demolition Concrete
Saw when taking a break or stopping work.14 Place the unit in such a way that the disc
is not touching anything and cannot endanger anyone.
• Do not put the overheated Certa Petrol Demolition Concrete Saw in dry grass or on
any inflammable objects. The muffler is very hot (danger of fire).
• Important: After wet cutting, first turn off the water feed and then let the disc run at
least 30 seconds, to fling off the remaining water and prevent corrosion.
Kickback, lock-in and gyroscopic forces
• When working with the Certa Petrol Demolition
Concrete Saw there is a danger of kickback and
lock-in.
• Kickback occurs when the top of the cutting disc
is used for cutting.
15
• This causes the Certa Petrol Demolition Concrete Saw to be thrown back toward the
user with great force and out of control. Risk of Injury!
To prevent kickback, observe the following:
• Never cut with the section of the cutting disc shown in Figure 15. Be especially careful
when reinserting the disc into cuts that have already been started!
• Lock-in occurs when the cut narrows (crack or workpiece under stress).
• This causes the Certa Petrol Demolition Concrete Saw to suddenly jump forward, out
of control and with great force. Risk of injury!
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To prevent lock-in, observe the following:
• When reinserting the disc into previous cuts,
have the Certa Petrol Demolition Concrete
Saw running at top speed. Always cut at top
speed.
• Always support the workpiece so that the cut
is under tension16 so that the cut does not
press together and jam the cutting disc as it
proceeds through the material.
• When starting a cut, apply the disc to the workpiece with care. Do not just shove it into
the material.
• Never cut more than one piece at a time! When cutting, make sure that no other
workpiece comes into contact.
• Gyroscopic forces come into play when handling a Certa Petrol Demolition Concrete
Saw with a rapidly rotating composite wheel.
• To prevent gyroscopic forces developing, note the following: Do not rotate the machine
rapidly about its longitudinal axis!
• Be warned” If gyroscopic forces are present, the saw will react in an uncontrolled
manner, and there is a danger that injuries may occur.
Working behaviour/Method of working
• Check the integrity of the composite wheel both before and after fitting it to the
machine.
• Before starting work, check the work area for any hazards (electrical wires, inflammable
substances) marks the work area (for example with warning signs or by cordoning off
the area).
• When working with the Certa Petrol Demolition Concrete Saw, hold it firmly by the
front and rear handles. Never leave the Certa Petrol Demolition Concrete Saw
unattended!
• Use the Certa Petrol Demolition Concrete Saw at high speed as far as possible (see
Specifications section).
• Only use the Certa Petrol Demolition Concrete Saw during good light and visibility
periods. Be aware of slippery or wet areas and of ice and snow. Risk of slipping!
• Never work on unstable surfaces Make sure
that there are no obstacles in the working
area, risk of stumbling. Always ensure that you
have a safe footing.
• Never cut above your shoulder height.17
• Never stand on a ladder to cut.17
• Never use the Certa Petrol Demolition
Concrete Saw while standing on scaffolding.
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• Do not lean over too far when working. When
putting down and picking up the Certa Petrol
Demolition Concrete Saw, do not bend over from
the waist, but instead bend in the knees.
• Guide the Certa Petrol Demolition Concrete Saw
in such a way that no part of your body is within
the extended swing range of the disk.18
• Use cutting discs only for the materials for which they are designed!
• Use cutting discs only for the materials for which they are designed. Do not use the
Certa Petrol Demolition Concrete Saw to lift and shovel away pieces of material and
other objects. Important! Before cutting, remove all foreign objects, such as rocks,
gravel, nails etc. from the cutting area. Otherwise, such objects can be flung away by
the disc with great speed. Injury hazard!
• When cutting workpieces down to length, use firm support. If necessary, secure the
workpiece from slipping, but do not steady it with your foot or allow another person to
hold it.
• When cutting round items, always secure them against rotation.
• When using synthetic resin cutting discs, always observe the following:
Caution:
o Synthetic resin cutting discs can absorb moisture.
o This moisture can cause the disc to become unbalanced at high speed. This
imbalance can cause the disc to break.
o Do not cool resin cutting discs with water or other fluids.
o Do not expose resin cutting discs to high humidity or rain!
Do not use resin cutting discs past their use-by date (expiration date)! The date (quarter and
year) is stamped on the disc's arbour ring.
Example: 04/2020. This cutting disc can be used through the end of the fourth quarter of
2020 if properly stored and correctly used.
Cutting metals
Important!
• Always wear approved respiratory protection!
• Materials that can release toxic substances may be cut only after notifying the proper
authorities and under their supervision or that of a person appointed by them.
Caution!
The rapid rotation of the cutting disc heats the metal
and melts it at the point of contact. Swing the guard
as far down as possible
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to direct the stream of sparks
forward, away from the operator (fire hazard).
Page 13
• Determine the cut line, mark the cut and apply
the disc to the material at moderate speed, to cut
a guide groove before going to top speed and
applying more pressure to the Certa Petrol
Demolition Concrete Saw.
• Keep the disc straight and vertical. Do not tip it,
as this can break it.
• The best way to get a good, clean-cut is to pull or
move the Certa Petrol Demolition Concrete Saw back and forth. Do not simply press
the disc into the material.
• Thick round stock is best to cut in stages.
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• Thin tubing and pipes can be cut with a simple downward cut.
• Cut large-diameter pipes as for round stock. To prevent tipping and for better control,
do not let the disc sink too deeply into the material. Instead, always cut shallow
around the whole piece.
• Worn discs have a smaller diameter than new discs so that at the same engine speed
they have a lower effective circumferential speed and therefore do not cut as well.
• Cut I-beams and L-bars in steps; see Figure 21.
• Cut bands and plates like pipes: along the wide
side with a long cut.
• When cutting material under stress (supported
material or material in structures), always make
a notch in the thrust (pressure) side and then
cut from the tension side, so that the disc does
not lock-in. Secure cut-off material from falling!
CAUTION!
If there is a chance that the material is under stress, be prepared for it to kickback. Make sure
you can get out of the way if necessary.
Be particularly careful in scrap-metal yards, junkyards, at accident sites and with haphazard
piles of material. Precariously balanced pieces or pieces under stress can act in
unpredictable ways and may slide, jump out or burst. Secure cut-off material from falling!
Always exercise extreme caution and use only equipment that is in perfect working order.
Observe the accident-prevention rules and regulations of your employer and/or insurance
organisation.
Cutting masonry and concrete
IMPORTANT!
Always wear approved respiratory protection!
Asbestos and other materials that can release toxic substances may be cut only after
notifying the proper authorities and under their supervision or that of a person appointed by
them. While cutting pressurised and reinforced concrete piles, follow the instructions and
standards of the responsible authorities or the builder of the structural member.
Reinforcement rods must be cut in the prescribed sequence and by applicable safety
regulations.
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Note:
Mortar, stone and concrete develop large quantities of dust during cutting. To increase the
lifetime of the editing disc (by cooling) to improve visibility and to avoid excessive dust
creation, it strongly recommends wet cutting instead of dry cutting.
In wet cutting, the disc is wetted at an equal rate on both sides by a trickle of water; offers
the right accessories for all wet cutting applications (see also “Special accessories”).
• Remove foreign objects such as sand, stones and
nails found within the working area.
• Caution: Watch out for electric wires and cables!
The rapid rotation of the cutting disc at the point of
contact throws fragments out of the cut groove at high
speed. For your safety, swing the protection hood down
as far as possible,
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so that material fragments are
thrown forward, away from the operator.
• Mark the cut and then make a groove about 5 mm ( just under 1/5”) along the entire
length of the planned cut. This groove will then guide the Certa Petrol Demolition
Concrete Saw accurately during the actual cut-off.
• Perform the cut with a steady back-and-forth
motion.
• When cutting slabs to size, you need not cut
through the entire material thickness (creating
unnecessary dust). Instead, simply make a
shallow groove and then knock off the excess
material cleanly on a flat surface.
25
CAREFUL!
When cutting into lengths, cutting through material, making cut-outs, etc., always make
sure to plan the direction and sequence of cuts in such a way that the disc does not get
jammed by the cut-off piece and that no persons can be injured by falling pieces.
First aid
For the event of a possible accident, please make sure that a first aid kit is always
immediately available close by. Immediately replace any items used from the first aid box.
When calling for help, give the following information:
• Place of the accident
• What happened
• Kind of injuries
• Your name
• Number of injured people
Note: Individuals with poor circulation who are exposed to excessive vibration may
experience injury to blood vessels or the nervous system.
Vibration may cause the following symptoms occurs in the fingers, hands or wrists: "Falling
asleep" (numbness), tingling, pain, stabbing sensation, alteration of skin colour or the skin. If
any of these symptoms occur, see a physician!
Page 15
1
Certa Petrol Demolition Concrete Saw
2
Cutting disc (not in the general scope of delivery. Country-specific)
3
Screwdriver (for carburettor adjustment)
4
Offset screwdriver
5
Universal wrench (13/19)
6
User guide
6
Components in the box
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1.
Handle
11.
Cover (up)
2.
Air filter cover
12.
Choke
3.
Tubular handle
13.
Starter handle
4.
Wheel cover
14.
Trigger control arm
5.
Adjust handle
15.
Trigger
6.
Adjusting screw
16.
Starter
7.
Belt protection cover
17.
Wheel
8.
Tank cap
18.
Muffler
9.
Extinguishing switch
19.
Cutting disc
10.
Tubular handle cover
20.
Big pressure plate
21.
Screw
Overview of the saw
Page 17
Caution:
• Always turn off the engine and pull off the spark plug cap before doing any work on the
Certa Petrol Demolition Concrete Saw! Always wear protective gloves!
• Start the Certa Petrol Demolition Concrete Saw only after complete assembly and
inspection.
For the following work, use the assembly tools:
• 13/19 AF combination wrench (cross sleeve)
• Allen key
• Carburettor adjustment screwdriver
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Place the Certa Petrol Demolition Concrete Saw on a stable surface and carry out the
following assembly steps:
Mounting the cutting disc
1. Cross sleeve
2. Allen key
3. Cutting disc
4. Large plate #1
The inner hole of the cutting disc is selected to be installed in sequence as shown in the
second configuration image above:
5. Small plate
6. M10x20 Hexagon screw
7. Large plate #2
8. Belt protection cover
• Large plate #1, cutting plate (the cutting direction is consistent with the arrow of
the wheel housing), Large plate #2 (with the small step facing outward), small
plate, then the M10x20 outer hexagonal screw.
The inner hole of the cutting disc is 25.4, which shall be installed in sequence as shown in
the first configuration image above:
• Large plate #2 (small step outward), cutting plate (the cutting direction is
consistent with the arrow of the grinding wheel cover), large plate #1, small plate,
then the M10x20 outer hexagonal screw shall be installed.
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Disassembling and cutting disc
• First, insert the Allen key into the middle hole of the belt protection cover. The
cutting disc cannot be rotated.
• Use the cross sleeve M10x20 outer hexagon screws to loosen or tighten to complete
the disassembly of the cutting disc.
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Petrol
40:1
FUEL
Caution:
• This tool uses petroleum products (petrol and oil).
• Be especially careful when handling petrol.
• Do not smoke. Do not allow petrol to come near flames, sparks or tire (explosion
hazard).
Fuel mixture:
• This tool is powered by a high-performance aircooled two-stroke engine. It runs on a mixture of
petrol and two-stroke engine oil.
• The engine is designed for unleaded regular
petrol with a min. octane value of 89. In case no
such fuel is available, you can use fuel with a
higher-octane value. This will not affect the
engine.
• To obtain an optimum engine output and to
protect your health and the environment use
unleaded fuel only.
• To lubricate the engine, use synthetic oil for two-stroke air-cooled engines, this must
be added to the fuel.
The correct mixture ratio:
• 40:1 When using synthetic two-stroke engine oil, i.e. 40 parts petrol to 1-part oil.
Note: For preparing the fuel-oil mixture, first mix the entire oil quantity with half of the fuel
required, then add the remaining fuel.
Thoroughly blend the mixture before filling it into the tank.
Caution: Open the tank cap carefully, as pressure might have built up inside!
It is not wise to add more engine oil than specified to ensure safe operation. This will only
result in higher production of combustion residues which will pollute the environment and
clog the exhaust channel in the cylinder as well as the muffler. Also, fuel consumption will
rise and performance will decrease.
Fuel Storage
Fuels have a limited storage life. Fuel and fuel mixtures age through evaporation, especially
at high temperatures Aged fuel and fuel mixtures can cause starting problems and damage
the engine. Purchase only that amount of fuel, which will be consumed over the next few
months. At high temperatures, once the fuel has been mixed it should be used up in 6-8
weeks.
Store fuel only in proper containers, in dry, cools, secure locations!
Page 21
Fuel Mixture
Avoid Skin and Eye Contact
Mineral oil products degrease your skin. If your skin comes in contact with these
substances repeatedly and tor an extended period, it will desiccate, various skin
diseases may result. Also, allergic reactions are known to occur. Eyes can be
irritated by contact with oil. If oil comes into your eyes, wash them with clear
water, if your eyes are still irritated, see a doctor immediately!
Refuelling
Important!
1. Follow the safety precautions!
2. Be careful and cautious when handling fuels.
3. The engine must be turned off and cooled down.
4. Carefully clean the area around the fuel tank filler neck to keep dirt from getting in
5. Place the Certa Petrol Demolition Concrete Saw on an even surface.
6. Unscrew the tank cap and fill tank with fuel mixture. Take care to avoid spilling.
7. Screw the tank cap back on hand-tight
8. Clean screw cap and tank after refuelling. Never start or operate the Certa Petrol
9. If fuel gets on your clothing, change clothes immediately.
the tank.
Demolition Concrete Saw in the same place as it was fuelled!
Page 22
3 Meter
If necessary
OPERATING
Starting the engine
Caution:
Read through all of the Safety & Warnings instructions prior to operating!
Start the Certa Petrol Demolition Concrete Saw only after complete assembly and
inspection!
Move at least 3m (10 feet) away from the location where you fuelled the Certa Petrol
Demolition Concrete Saw.
Make sure you have a good footing and place the Certa Petrol Demolition Concrete Saw on
the ground in such a way that the cutting disc is not touching anything.
Page 23
Combination switch in the safety position
Ignition current cut off. This is necessary for all maintenance, repair and installation work.
Move the protective hood (1) into the proper position for the work you intend to do (see
illustration)
The protective hood (1) can be moved between the stops in both directions.
Note: A water supply line (from a pressurised water tank or other sources) is connected by
the water set on the protective hood; the water flow rate can be adjusted with the adjusting
screw (2). Press the 1/2” hose into the holder.
For a slower flow, turn the adjusting screw clockwise.
For faster flow, turn it counter-clockwise.
Cold starting:
Page 24
Engine off
Warm Start (ON)
Cold Start (Choke)
1. Starter
2. Fuel tank cap
3. Flameout switch
4. Trigger
5. Trigger control
6. Choke
• Grasp front handles firmly with one hand and press the Certa Petrol Demolition
Concrete Saw against the ground.
• Place left toe in the rear hand guard.
• Move the flameout switch (3) up (into choke position). This also activates the half-
throttle lock.
• Pull the starter handle smoothly and evenly, until you hear the first ignition (max. 35 pulls).
Caution: Do not pull the starter cable more than about 50 cm out, and let it back in slowly
by hand. Move the flameout switch (3) to the central ON position Pull the starter handle
smoothly and evenly again.
As soon as the engine is running grasp the rear handle (the Trigger control (5) is activated by
the palm) and press the throttle trigger (4). The half-throttle lock will disengage and the
engine will now idle.
Warm starting:
As described above for cold starting, but before starting push the flameout switch (3) up
(Choke position) and then right away back to the middle “ON” position. This is only to
engage the half-throttle lock. If the engine doesn't start after 2 or 3 pulls, repeat the entire
starting procedure as described for cold starting.
Note: If the engine was switched off only for a short time, the saw can be started without
using the flameout switch.
Stopping the engine
Depress the combination switch (3).
Note: After being pressed down, the combination switch will revert to the “on” position
again. The engine is switched off but can be turned on again without moving the
combination switch.
Page 25
Important: To cut off the ignition current, push the combination switch all the way down
past the resistance point to the safety position.
Adjusting the carburettor
Note: The grinding parts are equipped with electronic ignition to limit the speed.
At the factory, the idling speed has been set to approx. 2600 rpm, but the running-in process
of a new engine may require slight readjustment of the idling speed.
Adjustments to the adjusting screws (L) and (H) may only be made by an authorised service
centre.
Special Accessories
Diamond cutting discs:
The diamond cutting discs meet the highest demands in working safety, ease of operation
and economical cutting performance. They can be used for cutting all materials except
metal.
The high durability of the diamond grains ensures low wear and thereby a very long service
life with almost no change in disc diameter over the lifetime of the disc. This gives consistent
cutting performance and thus high economy. The outstanding cutting quality of the discs
makes the cutting easier.
The metal disc plates give highly concentric running for minimal vibration during use.
The use of diamond cutting discs reduces cutting time significantly. This in turn leads to
lower operating costs (fuel consumption wear on parts, repairs and the environment).
Pressurised water tank:
To keep down dust and for better cutting-disc cooling offers several options for wetting the
disc during operation. The pressurised water tank is connected to the Certa Petrol
Demolition Concrete Saw by the water set on the protective hood.
Page 26
CARE & MAINTENANCE
Transport and storage advice
• Always turn off the Certa Petrol Demolition Concrete Saw when transporting it or
moving it from place to place on a site.
• Never carry or move the unit with the engine on or the disc moving!
• Carry the unit only by the tubular (middle) handle with the cutting disc pointing
behind you. Avoid touching the exhaust muffler (burn hazard!).
• When moving the Certa Petrol Demolition Concrete Saw over longer distances, use
a wheelbarrow or wagon.
• When transporting the Certa Petrol Demolition Concrete Saw in a vehicle, make
sure it is securely positioned in such a way that no fuel can leak out. Always remove
the cutting disc before transporting the unit in a vehicle.
• The Certa Petrol Demolition Concrete Saw should be stored safely in a dry place. It
must not be left outdoors! Always dismount the cutting disc before storage. Keep
the Certa Petrol Demolition Concrete Saw away from children.
• Before long-term storage and before shipping the Certa Petrol Demolition
Concrete Saw, follow the instructions in this Care & Maintenance section.
• Always empty the fuel tank and run the carburettor dry.
• When putting cutting discs in storage, be careful to:
1. Clean and dry the discs well. CAUTION: Do not clean synthetic resin cutting
discs with water or other fluids!
2. Store the discs, laying down flat.
3. Avoid dampness, freezing temperatures, direct sunshine, high temperatures
and temperature fluctuations, as these can cause breakage and splintering.
4. Before re-using a resin cutting disc, make sure of the use-by (expiration) date
(quarter and year, stamped on the arbour ring). If this date has been
exceeded, do NOT use the cutting disc.
• Always check new cutting discs or cutting discs that have been in storage to make
sure that they are free of defects and before the first cut test-run the tool at top
speed for at least 60 seconds. Keep body parts and people well away out of range
of the direction of the cutting disc during this test.
Page 27
Maintenance:
• Before performing maintenance work, switch off the Certa Petrol Demolition
Concrete Saw and pull out the plug cap.
• Allow the Certa Petrol Demolition Concrete Saw to cool off before doing any
maintenance work (burn hazard)!
• Always check the Certa Petrol Demolition Concrete Saw before use to ensure that
it is in good working order. Check that the cutting disc is properly mounted, and
that the cutting wheel is undamaged and suitable for the job it will be used for.
• Operate the Certa Petrol Demolition Concrete Saw only at a low noise and
emission level. For this, ensure the carburettor is adjusted correctly.
• Clean the Certa Petrol Demolition Concrete Saw regularly.
• Check the fuel lank cap regularly for good sealing.
Observe the accident prevention instructions issued by trade associations and insurance
companies. NEVER perform any modifications to the Certa Petrol Demolition Concrete
Saw. You will only be putting your safety at risk!
Perform only the general maintenance and repair works described in the user guide. All other
work must be carried out by an approved Kogan.com service representative.
Use only original spares and accessories. The use of non-original spares, accessories or
cutting disc sin creases the risk of an accident. It cannot accept any responsibility for
accidents or damage occurring in association with the use of cutting discs or accessories
other than the original.
Disposal and environmental protection
Be mindful of the environment!
Dispose of worn-out or defective cutting discs by your local disposal regulations. To protect
unusable cutting discs from misuse, destroy them before disposal.
When the Certa Petrol Demolition Concrete Saw is worn out or damaged beyond repair,
have it disposed of or recycled in an environmentally sound manner. If necessary, consult
your local council for more information.
Service
For correct adjustment of the idling speed, the following steps must be carried out:
• Start the engine and run it until it is warm (about 3- 5 minutes).
• Adjust the carburettor with the screwdriver (7) included with the Certa Petrol
Demolition Concrete Saw. It has a lug that helps with adjustment.
Page 28
Readjust the idling speed.
If the cut-off disc turns when the engine is idling, turn the throttle stop screw (7) counterclockwise in small increments until the disc no longer turns.
If the engine suddenly steps in idle, turn the screw back slightly clockwise.
Switch off the engine.
Maintenance:
Before doing any work on the Certa Petrol Demolition Concrete Saw turn off the engine,
remove the cutting disc, pull the plug cap off the spark plug and wear protective gloves!
Start the Certa Petrol Demolition Concrete Saw only after complete assembly and
inspection.
Important: Because many of the parts and assemblies not specifically mentioned in this
user guide are vital to the safe operation of the unit, and because all parts are subject to a
certain amount of wear and tear, it is important for your safety that you have the unit
checked and maintained regularly by a service centre.
Important:
If the cutting wheel breaks during cutting, the Certa Petrol Demolition Concrete
Saw must be repaired by a service centre before being used again!
Page 29
Changing the V-belt
• Loosen bolts (1) and remove belt cover (2).
• Move the V-belt pulley into the position shown.
• Insert the Allen key into the hole (3) to block
the V-belt pulley (5).
• Note: Make sure that the V-belt
pulley remains blocked.
• Use the combination tool to turn the
nut (4) about one turn counterclockwise.
• Use the combination tool to turn the
eccentric (6) forcefully counterclockwise to the position shown.
• Remove the old V-belt (7) or belt
fragments.
• Clean out the interior with a brush.
Insert a new V-belt:
Use the combination tool to turn the eccentric (6)
forcefully clockwise to its original position (V-belt is now
tight), tighten the nut (4).
Remove Allen key from the hole (3).
Put the belt cover (2) on and tighten the bolts (1).
Note: The V-belt is highly elastic, so it is not necessary to
retighten it.
A worn V-belt cause the cut-off disc turns at the lowest idle
speed. In this case, the V-belt must be replaced!
Cleaning the protection hood
Over time, the inside of the protective hood can become caked with material residue
(especially Iran wet cutting) which if allowed to accumulate can hinder the free rotation of
me cutting disc. For this reason, the hood must be cleaned out from time to time. Take off
the cutting wheel with spring washer and remove the accumulated material from inside me
hood with a strip of wood or similar implement.
Clean the shaft and all removed parts.
Page 30
Note:
To install the cutting wheels, see “Mounting the cutting wheel”.
Cleaning and Changing the Air Filter
Caution:
Turn off the engine before cleaning the air filter. Never
clean out the air filter with compressed air. Do not use
fuel to clean the air filter insert or inner filter.
The service life of the engine depends on the condition
and regular maintenance of the filter elements. Failure
to perform maintenance and cleaning at the
prescribed intervals will cause increased wear inside
the engine.
If the air filter becomes damaged, replace
immediately. Pieces of cloth or large dirt particles can
destroy the engine. Do not work in dusty conditions
when it can be avoided. The fine dust generated
when dry-cutting concrete and stone is hazardous to
the health of the operator and also shortens the
service life of the product. Whenever possible, wetcut with water when working in concrete and stone,
to bind the dust.
• Loosen both bolts (2) and remove the filler cover
(1).
• Take the air finer cover (3) out of the cover (5).
• Loosen the bolts (4) on the cover and remove the
cover. Remove the inner filter (6).
Inner filer:
Wash out the dirty inner filter (6) in wet cloth with
regular dishwashing liquid.
Let the Inner filter dry thoroughly.
Page 31
Air filter insert (paper cartridge):
The air filter insert (3) filters the intake air through a very fine paper filter liner system. For this
reason the cartridge must never be washed or cleaned with compressed air. Check the air
filter insert once per month and clean if necessary.
To c le an the air filter insert, spread it out slightly and carefully tap it against a clean surface.
Replace the air filter insert every 20 operating hours.
Note: Check and clean the air filter every 6 hours.
Replace it immediately if there is a drop in power or speed, or smoke in the exhaust.
Before installing the filter system, check the intake opening to make sure no dirt particles
have fallen in. If they have, remove them.
Replacing the spark plug
Page 32
CAUTION:
• Do not touch the spark plug or plug cap if the engine is running (high voltage).
• Switch off the engine before starting any maintenance work.
• A hot engine can cause burns. Wear protective gloves!
• The spark plug must be replaced in case of damage to the insulator, electrode
erosion (burn) or if the electrodes are very dirty or oily.
• Remove the filter cover and hood. See cleaning/changing the air-filter.
• Pull the plug cap (1) off the spark plug. Use only the combination wrench supplied
with the saw to remove the spark plug.
CAUTION: To p r e v e nt damage to the decompression valve when unscrewing the spark plug
position the combination tool in such a way that does not impact the valve.
Steps of removing spark plug:
1. Open the engine cover with the screwdriver
2. Remove 3 clips from the cover of the air filter
3. Remove the whole air filter cover
4. Remove the ignition coil cap
5. Then remove the spark plug
Checking the ignition spark
Insert the combination tool (2) between the ventilation hood and cylinder only as shown in
the illustration (previous page).
Caution!
• Do not insert the combination tool Into the spark plug hole, but make contact only
with the cylinder (otherwise, you may damage the engine).
• Using insulated pliers, hold the spark plug (3) (unscrewed but with the plug cap on)
against the combination tool (away from the spark plug hole).
• Switch the combination switch (4) to “ON”.
• Pull the starter cable hard.
• If the function is correct, an ignition spark must be visible near the electrodes.
Replacing the suction head
The Felt filter (5) of the suction head can become dogged, it is recommended to replace the
suction head once every three months to ensure unimpeded fuel flow to the carburettor.
Unscrew the tank cap (6); pull the retainer out of the opening. Empty the fuel tank.
Use a wire hook to pull the suction out of the tank opening for replacement. Do not allow
fuel to come into contact with skin!
Page 33
Instructions for periodic maintenance
Frequency
Part
Maintenance procedure
•
Protection hood
• Clean exterior, check for damage. In case of damage,
• Clean the entire product
• Cutting disc
• Tank cap
Every day
• Idle speed
• Check (cutting discs must not turn on idle)
• Starter housing
• Screws and nuts
• Check the air filter insert, clean as needed, replace
alter 500 operating hours
Every 3
• Suction head fuel
tank
• Replace
• Clean
Annually
• Entire product
• Clean exterior, check for damage. In case of damage,
• Run empty
To ensure long life, prevent damage and ensure the full functioning of the safety features,
the following maintenance must be performed regularly. Warranty claims can be recognised
only if this work is performed regularly and properly Failure to perform this general
maintenance work can lead to accidents!
Users of the Certa Petrol Demolition Concrete Saw must not perform any maintenance work
not described in this User guide. All such work must be carried out by a service centre.
General
Before each
start
Every week
Monthly
months
Entire product
• Cutting disc
• Clutch
•
• Protective hood
• Combination
switch
• Safety locking
button
• Throttle lever
• Starter cable
• V-belt
• Spark plug
• Muffler
• Air filter insert
have repaired by a qualified service centre
immediately Inspect regularly for damage and wear.
• Have inspected at a service centre.
• Inspect for damage and make sure the cutting wheel
is right for the job
• Adjust position
• Functional check
• Functional check
• Functional check
• Clean to ensure proper air cooling
• Check for damage inspect for damage and wear
• Check and replace if necessary
• Check the tightness of mounting
• Check their condition and that they are firmly
secured.
• Check at an authorised service centre
• Entire product
Before longterm storage
• Cutting disc
• Fuel tank
• Carburettor
• Remove and clean
• Empty and clean
have repaired by a qualified service centre
immediately.
Page 34
UNIT
Displacement
cm3
58CC
Bore
mm
45. 2mm
Stroke
mm
34mm
hp (kw)
/1/min
Max torque
Nm
3.9
Idling speed
1/min
3.000
Clutch engagement speed
1/min
4.200
Engine speed limitation
1/min
9.500±150
Max spindle speed
1/min
4.900
Fuel tank capacity
Ml
550ml
Mixture ratio (fuel/two-stroke oil)
40:1
Cutting disc for 80 m/sec.1)
in
12”/1”
Cutting disc for 80 m/sec.1)3)
in
12”/0. 9”
Overall weight (tanks empty, without cutting disc)
kg
10.4
Max. power/operating speed
3(2.4)/7.5000
Page 35
• Malfunction in fuel supply
• Mechanical malfunction
• Switch on STOP
defective.
• Choke in wrong position
interrupted.
• Cylinder base packing
Cylinder or piston rings
Outside
• Spark plug does not seal.
•
engine
TROUBLESHOOTING
Malfunction Fault area Observation Possible causes
Cutting disc does
not start turning
Cutting disc runs
in idle
Engine does not
start or only with
difficulty
Clutch Engine runs
Carburettor,
clutch V-belt
Ignition
system
Fuel supply
Compression
system
Cutting disc
runs
Ignition spark
No ignition
spark
Fuel tank is
filled
Inside
• Damage to clutch
• Incorrect idle speed
• Blocked clutch
• Belt has insufficient tension
• V-belt is worn out
system
• Compression system
• Fault or short-circuit in
the wiring
• Plug cap or spark plug
• Carburettor defective
• Suction head dirty
• Fuel line bent or
ring defective
• Radial shaft packing
defective
•
Mechanical
malfunction
Starter does
not engage
Spring in starter broken
• Broken parts inside the
Page 36
• Air filters dirty
clogged
Warm start
difficulties
Engine starts, but
dies immediately
Insufficient power N/A Engine is idling
Carburettor
Fuel supply
Fuel tank is
filled
Fuel tank Is
filled
• Incorrect carburettor
adjustment
• Ignition spark
• Wrong idling adjustment
• Suction head or
carburettor dirty
• Tank venting defective
• Fuel line interrupted
• Cable detective
• STOP switch defective.
• Decompression valve
dirty
• Incorrect carburettor
adjustment
• Muffler clogged
• Exhaust channel in
cylinder clogged
• Spark arrester screen
Page 37
NOTES
Page 38
NOTES
Page 39
NOTES
Page 40
Need more information?
We hope that this user guide has given you
the assistance needed for a simple set-up.
For the most up-to-date guide for your product,
as well as any additional assistance you may require,
head online to help.kogan.com
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