Instruction Manual
Important:
Read this instruction manual carefully before putting the Fast-Cut into operation and strictly observe the safety regulations!
Improper use can cause serious injury! Keep this instruction manual!
WARNING!
FUELS WITH MORE THAN 10% ETHANOL ARE NOT APPROVED FOR USE IN DIAMOND PRODUCTS
2-STROKE ENGINES!
Use of alternative fuels, such as E-20 (20% ethanol), E-85 (85% ethanol) or any fuels not meeting Diamond Products
requirements are not approved for use in Diamond Products 2-stroke gasoline engines!
USE OF ALTERNATIVE FUELS CAN CAUSE THE FOLLOWING PROBLEMS:
Poor engine performance, loss of power, overheating, fuel vapor lock, improper clutch engagement, premature
deterioration of fuel lines, premature deterioration of gaskets, premature deterioration of carburetors.
USING ALTERNATIVE FUELS AND/OR 2-STROKE OILS NOT ACCORDING TO JASO FC OR ISO-L-EGD IN
DIAMOND PRODUCTS 2-STROKE ENGINES WILL VOID YOUR ENGINE WARRANTY!
Model FC7312
Model FC7314
Model SC-8116XL
EMISSIONS COMPONENT DEFECT WARRANTY COVERAGE
Diamond Products, 333 Prospect Street, Elyria, OH 44035, (herein “Diamond Products”) warrant(“s”) to the initial retail purchaser
and each subsequent owner, that this non-road engine (herein „engine“) has been designed, built, and equipped to conform at the
time of initial sale to all applicable regulations of the U.S.
Environmental Protection Agency (EPA), and that the engine is free of defects in materials and workmanship which would cause this
engine to fail to conform with EPA regulations during its warranty period.
For the components listed under PARTS COVERED, the service dealer authorized by Diamond Products will, at no cost to you, make the
necessary diagnosis, repair, or replacement necessary to ensure that the engine complies with applicable U.S. EPA regulations.
EMISSION COMPONENT DEFECT WARRANTY PERIOD
The warranty period for this engine begins on the date of sale to the initial purchaser and continues for a period of 2 years.
PARTS COVERED
Listed below are the parts covered by the Emission Components Defect Warranty. Some of the parts listed below may require
scheduled maintenance and are warranted up to the rst scheduled replacement point for that part.
Fuel Metering System Ignition System
Carburetor and internal parts Spark plugs
Fuel lter, if applicable Flywheel Magneto
Throttle stopper, if applicable Ignition Coil
Choke System, if applicable
Air Induction System Miscellaneous Items Used in Above Systems
Air cleaner plate, Air lter Fuel hoses, clamps and sealing gaskets
Air cleaner case, Intake manifold
Components with evaporative emissions
Fuel tank, Fuel tank cap
OBTAINING WARRANTY SERVICE
To obtain warranty service, take your engine to the nearest authorized Diamond Products service dealer. Bring your sales receipts
indicating date of purchase for this engine. The service dealer authorized by Diamond Products will perform the necessary repairs or
adjustments within a reasonable amount of time and furnish you with a copy of the repair order. All parts and accessories replaced
under this warranty become the property of Diamond Products.
WHAT IS NOT COVERED
• Conditions resulting from tampering, misuse, improper adjustment (unless they were made by the service dealer authorized by
Diamond Products during a warranty repair), alteration, accident, failure to use the recommended fuel and oil, or not performing
required maintenance services.
• The replacement parts used for required maintenance services.
• Consequential damages such as loss of time, inconvenience, loss of use of the engine or equipment, etc.
• Diagnosis and inspection charges that do not result in warranty-eligible service being performed.
• Any non-authorized replacement part, or malfunction of authorized parts due to use of non-authorized parts.
OWNER’S WARRANTY RESPONSIBILITIES
As the engine owner, you are responsible for the performance of the required maintenance listed in your owner’s manual. Diamond
Products recommends that you retain all receipts covering maintenance on your engine, but Diamond Products cannot deny warranty solely for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance. As the engine owner,
you should however be aware that Diamond Products may deny warranty coverage if your engine or a part has failed due to abuse,
neglect, improper maintenance or unapproved modications.
You are responsible for presenting your engine to the nearest service dealer authorized by Diamond Products when a problem exists.
If you have any questions regarding your warranty rights and responsibilities, you should contact the Diamond Products Product
Support Department (U.S.A. 1-800-321-5336) for the information.
THINGS YOU SHOULD KNOW ABOUT THE EMISSION CONTROL SYSTEM WARRANTY:
MAINTENANCE AND REPAIRS
You are responsible for the proper maintenance of the engine. You should keep all receipts and maintenance records covering the
performance of regular maintenance in the event questions arise. These receipts and maintenance records should be transferred to
each subsequent owner of the engine. Diamond Products reserves the right to deny warranty coverage if the engine has not been
properly maintained. Warranty claims will not be denied, however, solely because of the lack of required maintenance or failure to
keep maintenance records.
MAINTENANCE, REPLACEMENT OR REPAIR OF EMISSION CONTROL DEVICES AND SYSTEMS MAY BE PERFORMED BY
ANY REPAIR ESTABLISHMENT OR INDIVIDUAL; HOWEVER, WARRANTY REPAIRS MUST BE PERFORMED BY A SERVICE
DEALER AUTHORIZED BY Diamond Products. THE USE OF PARTS THAT ARE NOT EQUIVALENT IN PERFORMANCE AND
DURABILITY TO AUTHORIZED PARTS MAY IMPAIR THE EFFECTIVENESS OF THE EMISSION CONTROL SYSTEM AND MAY
HAVE A BEARING ON THE OUTCOME OF A WARRANTY CLAIM.
If other than the parts authorized by Diamond Products are used for maintenance replacements or for the repair of components
affecting emission control, you should assure yourself that such parts are warranted by their manufacturer to be equivalent to the
parts authorized by Diamond Products in their performance and durability.
HOW TO MAKE A CLAIM
All repair qualifying under this limited warranty must be performed by a service dealer authorized by Diamond Products. In the event
that any emission-related part is found to be defective during the warranty period, you shall notify Diamond Products Product Support
Department (U.S.A. 1-800-321-5336) and you will be advised of the appropriate warranty service dealer or service providers where
the warranty repair can be performed.
2
Thank you for purchasing Diamond Products!
Congratulations on choosing a Diamond Products Fast-Cut cutoff
saw! We are condent that you will be satised with this modern
piece of equipment. The Diamond Products Fast-Cut features
specially designed high-performance engine with outstanding
power-to-weight ratios, for heavy-duty yet lightweight tools.
Other advantages of the Diamond Products Fast-Cut:
• Sturdy construction and high reliability.
• Maintenance‑free electronic ignition, hermetically sealed to
protect against dust and moisture.
• Vibration damping with the Diamond Products 2-mass system
(D2M) for tireless working even when guiding the Fast‑Cut by
hand.
• Five‑stage air‑lter system for reliable working even under very
dusty conditions.
• Two options for mounting the cutter attachment: Either centrally,
for good balance when guiding the unit manually, or on the side,
for ush cuts along walls or curbsides or horizontally directly
above the ground.
• Extensive range of resin-bonded and diamond grit cutting discs,
trolley with dust catcher, and systems for supplying water to the
disc.
The following industrial property rights apply:
US 08510690, SE 95027298, SE 95027306, IT 95000653,
IT 95000654, GBM 9412558, GBM 9412559.
We want you to be satised with your Diamond Products product.
In order to guarantee the optimal function and performance of your
Fast-Cut and to ensure your personal safety we would request you
to perform the following:
Read this instruction manual carefully before putting the
Fast-Cut into operation for the rst time, and strictly observe
the safety regulations! Failure to observe these precautions
can lead to severe injury or death!
Only for FC7312, FC7314: The Emissions Compliance Period
referred to on the emission Compliance label indicates the number of operating hours for which the engine has been shown to
meet federal emissions requirements.
Category C= 50 hours, B= 125 hours, and A= 300 hours.
Table of contents Page
Packing ................................................................................ 3
Delivery inventory ..............................................................4
Symbols ............................................................................... 4
SAFETY PRECAUTIONS
Intended use ................................................................... 5
General precautions .......................................................
Protective equipment ...................................................
Fuels / Refuelling ............................................................
Putting into operation ......................................................
Cutting discs ...................................................................
Kickback and lock-in .......................................................
Working behavior / Method of working
Always observe the following when using
synthetic resin cutting discs .............................................
Cutting metal ...................................................................
Cutting masonry and concrete ...................................
Transport and storage ...................................................
Maintenance .................................................................
First aid .........................................................................
Disposal and environmental protection ......................... 11
Technical data ................................................................... 12
Denomination of components ......................................... 13
PUTTING INTO OPERATION
Mounting the cutting disc ...............................................
Tightening the V-belt / Checking V-belt tension ............
Installing the pressure water system .......................
Fuels / Refuelling .....................................................
Starting the engine ........................................................
Cold-starting .................................................................
Warm-starting ...............................................................
Stop engine ................................................................... 19
Adjusting the carburetor .................................................. 20
MAINTENANCE
Changing the V-belt ......................................................
Cleaning the protection hood ........................................
Cleaning / changing the air lter ..............................
Replacing the spark plug ..............................................
Replacing the suction head ..........................................
Replacing the starter cable ...........................................
Replacing the return spring ...........................................
Instructions for periodic maintenance ...........................
Cutting attachment in central / side position
Repositioning the cutting attachment .......................
Replacing/cleaning the spark arrester screen ..............
Service, spare parts and guarantee ........................... 29-30
Troubleshooting ............................................................... 30
............................ 8
................. 27
5-6
9-10
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11
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14
15
15-16
16-17
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19
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24
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26
30
27-28
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Packing
Your Diamond Products Fast-Cut is packed in a cardboard box
to prevent shipping damage.
Cardboard is a basic raw material and is consequently reuseable
or suitable for recycling (waste paper recycling).
3
Delivery inventory
5 4 3 2
1
1. Fast-Cut
2. Adapter ring 0.8"/1.0" (not in the general scope of delivery. Country‑specic)
3. Screwdriver
4. Offset screwdriver
5. Universal wrench 13/19
7. Instruction manual
(for carburetor adjustment)
(not shown)
In case one of the parts listed should not be included in the
delivery inventory, please consult your sales agent.
Symbols
You will notice the following symbols on the Fast‑Cut and in the Instruction Manual:
Read instruction manual and
follow the warning- and safety
precautions!
Particular care and caution!
Forbidden!
Wear helmet and eye, respiratory
and hearing protection!
Wear protective gloves!
Wear respiratory protection!
Hazardous dust and/or
gas emission!
Never use carbide tipped, circular saw
blades or any kind of wood cutting
blades!
Combination Start/Stop (I/O) switch,
choke
Starting procedure
(Press decompression valve,
Engine - manual start)
Stop engine!
Warning!
Kickback!
Fire hazard from ying sparks!
No smoking!
No open re!
Direction of cutting wheel rotation
Warning: the max. peripheral
speed of the cutting disc is 80 m/s!
4
Cutting disc dimensions
Fuel and oil mixture
First aid
Recycling
Do not touch hot surfaces!
SAFETY PRECAUTIONS
Intended use
Fast-Cut
Use the Fast-Cut cutoff saw outdoors only, for trimming and cutting
suitable materials, using cutting discs rated for this machine.
Improper use:
Never use the cutoff saw cutting discs for grinding or sanding (using
the side of the cutting disc to remove material). The disc can break!
Never use the Fast‑Cut with saw blades, cutter blades, brushes,
carbide tipped, wood cutting blades etc.
Unauthorised users:
Persons unfamiliar with the Instruction Manual, children, young
people, and persons under the inuence of alcohol, drugs or medi-
cations must not use the Fast-Cut.
General precautions
- The operator MUST read this instruction manual to ensure
safe operation (even if you already have experience in using cutoff saws). It is important to be familiar with the opera-
tion of this particular cutoff saw. Users insufciently informed
will endanger themselves as well as others due to improper
handling.
- Let only persons who have experience in using cutoff saws work
with this unit. When letting another person use the Fast-Cut,
this instruction manual must be provided along with it.
- First-time operators should ask a specialist to instruct them in
working with gasoline-powered cutoff saws.
- Children and persons under 18 years of age must not be allowed
to use this Fast-Cut. Persons over the age of 16 years may,
however, use the Fast-Cut for the purpose of being trained as
long as they are under the supervision of a qualied trainer.
- Working with the Fast-Cut requires high concentration.
- Operate the Fast-Cut only if you are in good physical condition.
If you are tired, your attention will be reduced. Be especially
careful at the end of a working day. Perform all work calmly and
carefully. The user has to accept liability for others.
‑ Never work while under the inuence of alcohol, drugs, medica
tion or other substances which may impair vision, dexterity or
judgement.
‑ A re extinguisher must be available in the immediate vicinity
when working in easily inammable vegetation or when it has
not rained for a long time (danger of re).
- Asbestos and other materials that can release toxins may be cut
only with the necessary safety precautions and after notication
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 goggles (C) or visor when using the Fast-Cut.
- To prevent hearing damage, always wear suitable personal
hearing protection. (ear muffs (D), ear plugs, etc.). Octave
brand analysis upon request.
- When dry-cutting dust-producing materials such as stone
or concrete, always wear approved respiratory protection
(E).
-
Work gloves (F) of tough leather are part of the required
work kit of the Fast-Cut and must always be worn when
working with the Fast-Cut.
1
-
2
Protective equipment
- In order 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 Fast-Cut:
- The kind of clothing should be appropriate, i. e. it should be tight-
tting 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 from the operation of the Fast-Cut.
- It is necessary to wear a protective helmet whenever working
with the Fast-Cut. 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
grains. In order to prevent injuries to eyes and face, always wear
visor (B) protects the face from dust and material
3
4
5
- Always wear safety shoes or boots (G) with steel toes, non‑skid
soles, and leg protectors when working with the Fast-Cut. Safety
shoes equipped with a protective layer provide protection against
cuts and ensure a secure footing.
- Always wear a
ame‑retardant qualities whenever working with the cutoff
saw.
work suit (H) of tough material with sufcient
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 Fast-Cut.
‑ Do not smoke or work near open res (6).
- 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 vapors. Inhalation of fuel vapours can be hazardous to
your health.
- Do not spill fuel. If a spill occurs, clean off the Fast-Cut imme
diately. 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 vapors will ac
cumulate near the oor (explosion hazard).
‑ Ensure to rmly 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 Fast-Cut (7), but
not within the extended swing range of the cutting disc (direction
of sparks).
- Fuel cannot be stored for an unlimited period of time. Buy only
as much as will be consumed in the near future.
- When making up the gasoline/oil mixture, always put the oil in
the mixing container rst, and then the gasoline.
- Use only approved and marked containers for the transport and
storage of fuel.
-
Keep fuel away from children!
5
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6
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10 feet
7
(3 meters)
Putting into operation
- 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 Fast-Cut near inammable materials or explosive gases! The Fast-Cut can create sparks leading to
re 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 unauthorized 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 Fast-Cut 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 torn, 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 halfthrottle lock button functions properly, the grips are clean and
dry, and the combination switch functions properly (Start/Stop
(I/O) switch, choke). Visually inspect the mufer for damage and
possible dirt in the mufer area.
- Start the Fast-Cut only after complete assembly and inspection.
Never use the Fast‑Cut when it is not completely assembled.
100 feet (30 meters)
8
9
= wearing Protective Equipment
6
Cutoff discs
- The protection hood must always be on! Change discs only
with the engine off!
- There are two basic types of cutoff discs:
- For metal (hot cutting)
- 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 cutoff discs, always make sure to observe
the "direction of rotation" markings. Diamond discs should only be
used for cutting masonry/brick/ concrete etc.
- Cutoff 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 Fast-Cut during
cutting (11)!
- 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 arbor hole of the cutting disc must be an exact t with the arbor
or shaft. If the arbor hole is larger, it must be tted with an adapter
ring (available as an accessory).
-
The cutting disc must be rated for freehand cutting at up to 3850
rpm or 80 m/sec for 400 mm discs, 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 (12). Do not use defective cutting
discs.
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 foot
ing.
- Put the Fast-Cut into operation only as described in this instruction
manual (13). Always place your left foot in the rear handle and grasp
the other handle rmly (with thumb and ngers). Other starting
methods are not allowed.
- When starting the Fast-Cut 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 ies apart.
- When working with the Fast-Cut 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 ngers.
- CAUTION: When you release the throttle lever the disc will
keep spinning for a short period of time (free-wheeling effect).
- Continuously ensure that you have a safe footing.
-
- WARNING – CARBON MONOXIDE PRODUCED DURING USE
CAN KILL – DO NOT USE Fast-CutTER INDOORS – MAKE SURE
THERE IS PROPER VENTILATION WHEN USING Fast-CutTER
IN TRENCHES OR OTHER CONFINED SPACES.
- Switch off the Fast-Cut immediately if you observe any changes
in its operating behavior.
Switch off the engine before inspecting the V-belt tension or
-
tightening it, replacing the cutting wheel, repositioning the cutter
attachment (side or middle position) or eliminating faults (14).
- Turn off the engine immediately and check the disc if you hear or
feel any change in cutting behaviour.
- Turn off the Fast-Cut 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 Fast‑Cut in dry grass or on any inam
mable objects. The mufer is very hot (danger of re).
IMPORTANT: After wet cutting, rst turn off the water feed and then
-
let the disc run at least 30 seconds, to ing off the remaining water
and prevent corrosion.
Hold the Fast-Cut such that you will not breathe in the
exhaust gas. Do not work in closed rooms or in deep holes
or ditches (danger of poisoning by fumes).
min. 16 feet
11
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12
.
13
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14
10
(5 m)
● Maintenance
● Refuelling
● Changing cutoff discs
● Repositioning the
cutting attachment
● Stopping work
● Transport
● Putting out of function
7
Kickback and lock-in
- When working with the Fast-Cut 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 Fast-Cut 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 gure 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 Fast-Cut to suddenly jump forward, out of
control and with great force. Risk of injury!
To prevent lock-in, observe the following:
- When reinserting the disc into previous cuts, have the Fast-Cut
running at top speed. Always cut at top speed.
- Always support the workpiece so that the cut is under tension
(16), 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.
15
Working behavior / Method of working
- Before starting work, check the work area for any hazards
(electrical wires, inammable substances). Clearly mark the
work area (for example with warning signs or by cordoning off
the area).
‑ When working with the Fast‑Cut hold it rmly by the front and
rear handles. Never leave the Fast‑Cut unattended!
- Use the Fast-Cut at high speed as far as possible (see “Technical Data”).
- Only use the Fast-Cut 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 Fast‑Cut while standing on scaffolding.
- Do not lean over too far when working. When putting down and
picking up the Fast-Cut, do not bend over from the waist, but
instead bend in the knees. Save your back!
‑ Guide the Fast‑Cut in such a way that no part of your body is
within the extended swing range of the disc (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 Fast-Cut to lift up 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 ung away by the disc with great speed. Injury
hazard!
‑ When cutting workpieces down to length use a rm 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 guiding the Fast-Cut by hand, use the side mounting
position of the cutter attachment only when actually necessary.
Otherwise, always use the central position. This gives the unit
a better balance, for reduced operator fatigue.
8
16
17
18
When using synthetic resin cutting discs, always observe the following:
CAUTION:
- Synthetic resin cutting discs can absorb moisture. This
moisture can cause the disc to become unbalanced at high
speed. This imbalance can cause the disc to break.
- Do not cool resin cutting discs with water or other uids.
- 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
arbor ring.
EXAMPLE: 04 / 2013
This cutting disc can be used through the end of the fourth quarter
of 2013, 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 metal and melts it
at the point of contact. Swing the guard as far down as possible (19) in order to direct the stream of sparks forward, away
from the operator (re hazard).
- 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 Fast-Cut.
- 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
Fast-Cut back and forth. Do not simply press the disc into the
material.
- Thick round stock is best cut in stages (20).
- 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 mate
rial 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 cutoff material from falling!
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. When cutting prestressed 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 in accordance with applicable safety regulations.
NOTE:
Mortar, stone, and concrete develop large quantities of dust during
cutting. To increase the lifetime of the cutting disc (by cooling),
to improve visibility, and to avoid excessive dust creation, we
strongly recommend wet cutting instead of dry cutting.
19
20
-
CAUTION!
If there is a chance that the material is under stress, be prepared for it to kick back. Make sure you can get out of the
way if you have to!
Be particularly careful in scrap-metal yards, junkyards, at ac
cident 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 cutoff 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 organization.
-
21
9
In wet cutting, the disc is wetted at an equal rate on both sides
by a trickle of water. DIAMOND offers the right accessories for all
wet cutting applications.
- 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 (23), 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 Fast-Cut accurately guring the actual cutoff.
NOTE:
For long, straight cuts we recommend using a trolley (24). This
makes it much easier to guide the unit straight.
- 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 at surface (25).
CAREFUL!
When cutting into lengths, cutting through material, making cutouts,
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.
Transport and storage
- Always turn off the Fast-Cut when transporting it or moving it from place to place on a site (26).
-
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 cut
ting disc pointing behind you (26). Avoid touching the exhaust
mufer (burn hazard!)
- When moving the Fast-Cut over longer distances, use a
wheelbarrow or wagon.
- When transporting the Fast-Cut 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. Before transporting in a vehicle, allow the Fast-Cut
to cool off completely. Note: Mufers with catalytic converters
take longer to cool off!
- The Fast-Cut should be stored safely in a dry place. It must
not be left outdoors! Always dismount the cutting disc before
storage. Keep the Fast-Cut away from children.
- Before long-term storage and before shipping the Fast-Cut,
follow the instructions in the chapter on "Periodic care
and maintenance". ALWAYS empty the fuel tank and run
the carburetor dry.
- When putting cutting discs in storage, be careful to:
• Clean and dry them well. CAUTION:
resin cutting discs with water or other uids!
• Store them lying down at.
• Avoid dampness, freezing temperatures, direct sunshine,
high temperatures and temperature uctuations, as these
can cause breakage and splintering.
Before re-using a resin cutting disc, make sure of the use-by
•
(expiration) date (quarter and year, stamped on the arbor
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 rst 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.
Do NOT clean synthetic
23
24
-
25
10
26
Maintenance
- Before performing maintenance work switch off the FastCut
(27) and pull out the plug cap.
- Allow the Fast-Cut to cool off before doing any maintenance
work (burn hazard)!
- Fast-Cuts with catalytic converter take longer to cool
down!
- Always check the Fast-Cut before using it to make sure that
it is in good working order. In particular, make sure that the
cutting disc is properly mounted. Make sure that the cutting
wheel is undamaged and suitable for the job it will be used
for.
- Operate the Fast-Cut only at a low noise and emission level.
For this ensure the carburetor is adjusted correctly.
‑ Do not operate the Fast‑Cut with a defective or modied muf
er.
- Clean the Fast-Cut regularly.
- Check the fuel tank cap regularly for good sealing.
Observe the accident prevention instructions issued by
trade associations and insurance companies. NEVER
make any modications to the Fast-Cut! You will only be
putting your own safety at risk!
Perform only the maintenance and repair works described in
the instruction manual. All other work must be carried out by
Diamond Products Service.
Use only original Diamond Products spares and accesso
ries.
The use of non-Diamond Products spares, accessories, or
cutting discs increases the risk of accident. We cannot accept any responsibility for accidents or damage occurring in
association with the use of cutting discs or accessories other
than original Diamond Products.
27
-
SERVICE
28
-
First aid
For the event of a possible accident, please make sure that a
rst aid kit is always immediately available close by. Immediately
replace any items used from the rst aid box.
When calling for help, give the following information:
- Place of the accident
- What happened
‑ Number of injured people
- Kind of injuries
- Your name!
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 to occur in the ngers, hands or wrists: ”Falling asleep” (numbness), tingling, pain,
stabbing sensation, alteration of skin colour or of the skin. If any
of these symptoms occur, see a physician!
Disposal and environmental protection
Be mindful of the environment!
Dispose of worn-out or defective cutting discs in accordance with
your local disposal regulations. To protect unusable cutting discs
from misuse, destroy them before disposal.
When the Fast-Cut is worn out or damaged beyond repair, have
it disposed of or recycled in an environmentally sound manner. If
necessary, consult your local authorities.
29
11
Technical data
Displacement cu in (cm3)
FC7312 FC7314
4.5 (73) 4.5 (73)
Bore in (mm) 1.97 (50) 1.97 (50)
Stroke in (mm) 1.46 (37) 1.46 (37)
Max. power hp (kW) 5.1 (3.8) 5.1 (3.8)
Max. torque Nm 4.3 4.3
Idling speed 1/min 2,500 2,500
Clutch engagement speed 1/min 3,800 3,800
Engine speed limitation 1/min 9,400 ± 145 9,400 ± 145
Max. spindle speed 1/min 4,300 4,300
Sound pressure level at the operators ear dB(A) 100 100
Sound pressure level at the bystander’s position (50 ft) dB(A) 79 79
Vibration acceleration a
- Tubular handle (rated speed) m/s
- Rear handle (rated speed) m/s
per ANSI.175.4
h,w
2
2
4.4 4.4
6.2 6.2
Carburetor (diaphragm carburetor) Type WALBRO WJ-126
Ignition system (with speed limitation) Type electronic
Spark plug Type
NGK BPMR 7A / BOSCH WSR 6F / CHAMPION RCJ 6Y
Electrode gap in (mm) .020 (0.5) .020 (0.5)
Fuel consumption at max. load per ISO 8893 kg/h 1.7 1.7
Specic consumption at max. load per ISO 8893 g/kWh 450 450
Fuel tank capacity oz (l) 37 (1.1) 37 (1.1)
5)
Mixture ratio (fuel/two‑stroke oil)
Cutting disc for 80 m/sec.
Cutting disc for 80 m/sec.
2)
2) 4)
50:1 50:1
in 12" / 0.8" / 0.2"
in
3)
14" / 0.8" / 0.2" 3)
14" / 1.0" / 0.2" 3)
Arbor diameter in 0.8" 0.8" / 1.0"
V-belt no. 6060118 6060118
Overall weight (tanks empty, without cutting disc) lb 21.56 22.00
SC-8116XL
Displacement cu in (cm
3)
4.9 (81)
Bore in (mm) 2.05 (52)
Stroke in (mm) 1.49 (38)
Max. power hp (kW) 6.2 (4.5)
Max. torque Nm 5.2
Idling speed 1/min 2,500
Clutch engagement speed 1/min 3,800
Engine speed limitation 1/min 9,350 ± 145
Max. spindle speed 1/min 4,300
Sound pressure level at the operators ear dB(A) 100
Sound pressure level at the bystander’s position (50 ft) dB(A) 79
Vibration acceleration a
per ANSI.175.4
h,w
- Tubular handle (rated speed) m/s2 8.1
- Rear handle (rated speed) m/s2 6.1
Carburetor (diaphragm carburetor) Type WALBRO WJ-126
Ignition system (with speed limitation) Type electronic
Spark plug Type
NGK BPMR 7A / BOSCH WSR 6F / CHAMPION RCJ 6Y
Electrode gap in (mm) .020 (0.5)
Fuel consumption at max. load per ISO 8893 kg/h 2.3
Specic consumption at max. load per ISO 8893 g/kWh 500
Fuel tank capacity oz (l) 37 (1.1)
5)
Mixture ratio (fuel/two‑stroke oil)
Cutting disc for 80 m/sec.
Cutting disc for 80 m/sec.
2)
2) 4)
50:1
in
in
16" / 0.8" / 0.2" 3)
16" / 1.0" / 0.2" 3)
Arbor diameter in 0.8" (1.0") 4)
V-belt no. 6060373
Overall weight (tanks empty, without cutting disc) lb 23.37
2)
Circumference speed at max. engine speed
3)
Outside diameter / arbor hole / thickness
4)
Country‑specic
5)
Quality grade JASO FC or ISO‑L‑EGD specications.
12
Denomination of components (Illustration shows model FC7314)
1
2
3 4 5 6 7
8
25
9
1012 111314
24
23
17
22
18
19
20
21
15
16
1 Handle
2 Filter cover for air lter and spark plug cap
3 Cover lock
4 Tubular handle
5 Mufer
6 Protection hood
7 Grip
14 Decompression valve
15 Starter grip
16 Air intake
17 Combination switch „Choke, Start/Stop (I/O)”
18 Safety locking button
19 Throttle lever
20 Tank cap (fuel)
8 V-belt tension adjusting screw
9 Retaining nuts
10 Stand
11 Carburetor adjustment opening
12 Identication plate
13 Fuel tank with handle
21 Starter housing with starter
22 Cutting disc
23 Disc bolt
24 Spring washer
25 Hold opening
13
PUTTING INTO OPERATION
CAUTION:
Always turn off the engine and pull off the spark plug cap
before doing any work on the Fast-Cut! Always wear protective gloves!
CAUTION:
Start the Fast-Cut only after complete assembly and inspection.
For the the following work, use the assembly tools included
with delivery:
1. 13/19 AF combination wrench
2. Allen key
3. Carburetor adjustment screwdriver
4. Adapter ring (not in the general delivery inventory)
Place the Fast-Cut on a stable surface and carry out the
following assembly steps:
Only for models SC-8116XL
No air lter is installed!
Before operation, insert an oiled foam
lter (pre-lter), as shown in the adjacent illustration! To do this, take off the
lter cover (see the chapter on Cleaning
/ changing the air lter). Before taking the
foam lter out of the package, knead it thoroughly.
Sequence
Mounting the cutting disc
Inspect the disc for damage.
See SAFETY INSTRUCTIONS, Page 7.
Unscrew screw (9) and remove the spring washer (8).
Place the cutting disc (5) on the arbour (7).
NOTE: The arbor hole of the cutting disc must be an exact t
with the arbor or shaft. If the arbor hole is larger, it must be tted
with an adapter ring (*).
Make sure the cutting disc is installed so it turns in the right
direction, if a direction is marked on the disc.
Place the spring washer (8) on the arbour and insert the screw
(9) and tighten by hand.
Turn the disc slowly until the stop hole of the V-belt pulley is
visible in the cutting arm cover (10).
Insert the Allen key (2) as far as it will go. The shaft is now
blocked.
Tighten the screw with the combination wrench (1)
14
NOTE: Tighten the screw rmly (30 ± 2 Nm), as otherwise
the cutting wheel may slip during cutting.
Tightening the V-belt /
15
16
18 *
17
19
21
21
17
20
Checking V-belt tension
IMPORTANT:
Exact V-belt tension is essential for maximum cutting per
formance with minimum fuel consumption. Improper V-belt
tension will result in premature wear to the V-belt and V-belt
wheel or damage to the clutch bearing.
If the Fast-Cut is new or the V-belt has been replaced, re
tighten the V-belt after the rst hour of operation!
NOTE: The two fastening nuts (11) must be loosened before
tightening the V-belt or checking the tension.
To increase the belt tension, turn the tightening screw (12) to
the right (clockwise) with the combination wrench included with
the Fast-Cut.
The belt tension is correctly adjusted when the nut (13) is centred on the mark (14).
IMPORTANT:
After tightening/inspection, make certain to tighten
the fastening nuts (11) (30 ± 2 Nm).
-
-
Installing the pressure water system
Not in the general scope of delivery. Country-specic!
CAUTION: Before doing any work on the Fast-Cut,
always switch off the engine and disconnect the
spark plug cap!
NOTE: When using a protective hood for a maximum disk diam-
eter of 300 mm (12"), always shorten hose (15) to 180 mm (7").
To do this unscrew sleeve (16) and carefully pull tube (15) off
coupling (17) and cut to 180 mm. Then push the tube end back
over the coupling and tighten the sleeve all the way.
‑ Install the water connection as shown in gure. Push clamp
(22) around the front grip (23) and fasten with the bolt and
square nut.
- Pull the quick-release coupling (
- Remove the cutting disk (see instruction manual).
- Tube routing with the cutting assembly in the middle position,
- Tube routing with the cutting assembly in the outside position,
- Insert the nozzles (
and connect it to the 1/2" supply line (18).
see gure.
see gure.
19) through the protective hood (20) from
the inside and put on couplings (17). Screw on and tighten
the coupling caps (21).
24) from the water connection
IMPORTANT:
To avoid bending the tubes, be sure to position the couplings (17)
in accordance with gures as appropriate.
- Install the cutting disc (see instruction manual).
- Connect the quick-release coupling (
NOTE:
The water ow rate can be precisely adjusted with valve (25).
24) to the supply tube.
15
Fuels
24
25
22
23
Caution:
This tool uses petroleum products (gasoline and oil).
Be especially careful when handling gasoline.
Do not smoke. Do not allow gasoline to come near ames,
sparks or re (explosion hazard).
Fuel mixture
This tool is powered by a high-performance air-cooled two-stroke
engine. It runs on a mixture of gasoline and two-stroke engine
oil.
The engine is designed for unleaded regular gasoline with a
min. octane value of 91 (R+M)/2. In case no such fuel is available, you can use fuel with a higher octane value. This will not
affect the engine.
In order to obtain an optimum engine output and to protect
your health and the environment use unleaded fuel only.
To lubricate the engine, use a synthetic oil for two-stroke aircooled engines (quality grade JASO FC or ISO‑L‑EGD), which
has to be added to the fuel.
Gasoline
50:1
+
1.0 Us-gal. (3.7 l) 2.6 oz. (75 cm3)
2.5 Us-gal. (9.4 l) 6.4 oz. (189 cm3)
5.0 Us-gal. (18.9 l) 12.8 oz. (378 cm3)
16
NOTE: For preparing the fuel‑oil mixture rst mix the entire oil
quantity with half of the fuel required, then add the remaining
fuel. Shake the nished mixture thoroughly before pouring it
into the tank.
Caution
have built up inside!
It is not wise to add more engine oil than specied to
ensure safe operation. This will only result in a higher
production of combustion residues which will pollute the
environment and clog the exhaust channel in the cylinder
as well as the mufer. In addition, fuel consumption will
rise and performance will decrease.
: Open the tank cap carefully, as pressure might
The Storage of Fuel
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 fuel has been mixed it should be used
up in 6-8 weeks.
Use only approved and marked containers for transport
and storage. Store fuel only in dry, cool and secure
locations!
AVOID SKIN AND EYE CONTACT
Mineral oil products degrease your skin. If your skin comes in
contact with these substances repeatedly and for an extended
period of time, it will dry out. Various skin deseases may result.
In addition, allergic reactions are known to occur.
Eyes can be irritated by contact with oil. If oil comes into your
eyes, immediately wash them with clear water.
If your eyes are still irritated, see a doctor immediately!
Fuel mixture
Refuelling
IMPORTANT:
FOLLOW THE SAFETY PRECAUTIONS!
Be careful and cautious when handling fuels.
The engine must be turned off and cooled down!
Carefully clean the area around the fuel‑tank ller neck to keep
dirt from getting in the tank.
Place the unit on its side on an even surface.
Unscrew the tank cap and ll tank with fuel mixture. Take care
to avoid spilling.
Screw the tank cap back on hand-tight.
Clean screw cap and tank after refuelling. Never start or
operate the Fast-Cut in the same place as it was fuelled!
If fuel gets on your clothing, change clothes immediately.
17
Starting the engine
if
necessary
This model is tted with a semiautomatic decompression valve
(1) to make starting easier. Press the rubber cover until you
can feel it engage. This pushes in the deompression valve
behind it. This in turn reduces the compression, so that it takes
less force to pull the starter cord to accelerate the engine to its
starting speed.
The high pressure in the combustion chamber after the rst
ignition automatically closes the decompression valve.
CAUTION:
Observe the SAFETY INSTRUCTIONS on page 5 and 6!
Start the Fast-Cut only after complete assembly and in
spection!
Move at least 3m (10 feet) away from the place where you
fuelled the Fast-Cut.
Make sure you have a good footing, and place the Fast-Cut
on the ground in such a way that the cutting disc is not
touching anything.
-
3 meters
Move the protective hood (3) into the proper position for the
work you intend to do (see illustration).
Grasp the grip (2). The hood (3) can swing in both ways within
its range of motion.
Caution:
Always make sure that the straight outer edge of the impact plate
(4) and the edge of the hood are parallel (see arrows).
If this is not the case, take the tool to a service center.
18
6
Cold starting:
5
8
9
6
Grasp front handle rmly with one hand and press the Fast‑Cut
against the ground.
Place left toe in the rear handguard.
Push the combination switch (6) up (choke position). This will
automatically activate the half-throttle lock.
NOTE: If the Fast-Cut is mounted on the trolley, do not operate
the gas lever (throttle) on the side of the trolley!
Pull the starter cable out slowly until you feel resistance (piston
is now just before top dead center).
Press in the decompression valve (5).
Pull starter cable quickly and rmly, until you hear the rst
ignition, but to a max. of 3-5 pulls!
Important: Do not pull the starter cable out more than about
50 cm / 20”, and guide it back slowly by hand (instead of letting
it snap back).
Press in the decompression valve (5).
Move the combination switch (6) to the middle “I” position.
Again pull the starter cable quickly and rmly.
As soon as the engine is running, grasp the rear handle (the
safety lock switch (8) will be depressed by the palm of your hand)
and tap the throttle (9). The half-throttle lock will be disengaged
and the engine will run in idle.
Cold start (Choke)
Warm start
Engine off
Warm starting:
As described above for cold starting, but before starting push
the combination switch (6) up (Choke position) and then right
away back to the middle “I” 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.
Do not leave switch in the choke position when hot
starting!
Stopping the engine
Push the combination switch (6) down to position .
19
Adjusting
the carburetor
NOTE: The grinding parts are equipped with an electronic
ignition to limit the speed.
At the factory the idling speed has been set to approx.
2500 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 Diamond Products service
center. Accordingly, the holes for the two screws are
sealed shut.
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 carburetor with the screwdriver (1, Order No. 944
340 001) included with the Fast-Cut. It has a lug that helps
with adjustment.
Readjust the idling speed.
If the cut-off disc is still turning when the engine is running,
unscrew the adjusting screw of the throttle valve (2) until the
cut-off disc is no longer turning. When the engine is left running
at idling speed, tighten the screw a little.
Switch off the engine
20
SERVICE
MAINTENANCE
CAUTION:
Before doing any work on the Fast-Cut turn off the engine,
remove the cutting disc, pull the plug cap off the spark plug
and wear protective gloves!
CAUTION:
Start the Fast-Cut only after complete assembly and in
spection.
IMPORTANT:
Because many of the parts and assemblies not mentioned
in this Instruction Manual are vital to the safety of the
unit, and because all parts are subject to a certain amount
of wear and tear, it is important for your own safety that
you have the unit checked and maintained regularly by a
Diamond Products service center.
IMPORTANT:
If the cutting wheel breaks during cutting, the
Fast-Cut must be repaired by a Diamond Products
service center before being used again!
-
Changing the V-belt
Loosen nuts (3).
Loosen the tightening screw (1) (counter-clockwise) until the
end of the screw (2) is visible in the gap.
Loosen and unscrew the screw (detail X, only for SC8116XL).
Unscrew the nuts (3) and remove the cover (4).
Remove the screws (5) and (7) and remove the side piece
(6).
NOTE:
Screw (5) is longer than screws (7). Make sure
to put them back in the right places during reassembly!
Unscrew the screws (8) and remove the crankcase housing
cover (9).
Remove the old belt (10) or belt pieces.
NOTE: The illustration shows the V-belt for models FC7312
and FC7314).
Clean out the inside of the drive arm with a brush.
Put in a new V-belt.
NOTE:
Reassemble the crankcase housing cover (9), side piece (6)
and cover (4) in the reverse order.
To tighten the V-belt see ”Tightening the V-belt / Checking
V-belt tension”.
21
Cleaning the protection hood
Over time, the inside of the protective hood can become caked
with material residue (especially from wet cutting), which if
allowed to accumulate can hinder the free rotation of the 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 the hood with a strip of wood
or similar implement.
Clean the shaft and all removed parts.
Cleaning / changing the air lter
Turn the cover lock (11) counterclockwise to release it, and
carefully remove the lter cover (12).
There is a gasket (15) between the lter cover (12) and the
hood (14).
NOTE: To install the cutting wheel see ”Mounting the cutting
wheel”.
Remove screws (13) and take off the cover (14).
Clean the gasket (15) with a brush, and check for damage.
Take the pre‑lter (foam, 17) out of the lter cover.
Pull the air lter insert (paper cartridge, 18) out of the cover.
Remove the inner lter (16) from the intake opening.
Note:
Do not allow dirt to get into the carburetor!
Switch the combination switch to ”Choke” or cover the carburetor with a clean cloth.
22
CAUTION: Turn off the engine before cleaning the air lter! Never clean out the air lter with compressed air! Do
not clean the pre-lter and inner lter with fuel.
The service life of the engine depends on the condition and regular maintenance of the lter elements. Failure to
perform maintenance and cleaning at the prescribed intervals will cause increased wear inside the engine!
If the air lter 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 ne dust generated when dry-cutting concrete and stone
is hazardous to the health of the operator and also shortens the service life of the engine. Whenever possible, wet-cut
with water when working in concrete and stone, to bind the dust.
Pre-lter (dry foam)
Only for models FC7312, 7314
If the pre‑lter (1) is dirty, wash it out in lukewarm water with
standard dishwashing liquid or lter cleaner (Order No. 980
008 127). If using lter cleaner, proceed as described after
the text section "Cleaning".
Let the pre‑lter
NOTE: The pre‑lter must be cleaned daily, or several times
daily if working under dusty conditions. If cleaning is not
possible on‑site, have spare pre‑lters on hand. Replace the
pre‑lter at least every 25 operating hours.
To improve ltration effectiveness, the pre‑lter can be wet
ted with air‑lter oil. Before adding air‑lter oil, carefully
wash the lter with air‑lter cleaner. Care for the oiled air
lter as described for SC‑8116XL.
To insert the pre‑lter in the lter cover, position it so it ts
the space in the cover and then press it in (5). The pre‑lter
must t completely and cover all parts of the lter space,
without leaving any spaces unltered.
dry thoroughly.
Pre-lter (foam with air‑lter oil)
Only for models SC-8116XL
Clean or replace (when cutting with high dust amounts):
• Daily
or at least every
• 4 operating hours, or
• 8 tank llings, or
• 8 litres fuel mixture.
Clean or replace (
• weekly
or at least every
• 25 operating hours, or
-
• 50 tank llings, or
• 55 litres fuel mixture.
Cleaning:
Knead a capful lter cleaner into the foam material of the pre‑
lter (1) until it suds up well.
Rinse out pre‑lter thoroughly in running water.
Let the pre‑lter
NOTE: If using other air‑lter oils, follow the manufacturer’s
instructions.
If cleaning is not possible on‑site, have spare pre‑lters on
hand.
To insert the pre‑lter in the lter cover, position it so it ts the
space in the cover and then press it in (5). The pre‑lter must
t completely and cover all parts of the lter space, without
leaving any spaces unltered.
Cleaning: Rinse off coarse dirt in running water.
In order to ensure full ltration effectiveness, air‑lter
oil must be used with the pre‑lter. Wet the pre‑lter
with a capful (about 20 ccm) of air‑lter oil (biode-
gradable).
Knead the pre‑lter to evenly distribute the oil. Then
squeeze out any excess oil.
when cutting wet, or when cutting steel):
dry thoroughly.
Inner lters (all models)
Wash out the dirty inner lter (3 in lukewarm soapy water with
regular dishwashing liquid or lter cleaner.
Let the inner lter dry thoroughly.
Air lter insert (paper cartridge, all models)
The air lter insert (2 lters the intake air through a very ne
paper lter lamella system. For the reason the cartridge must
never be washed. Clean the air lter insert once a week.
To clean the air lter insert, spread it out slightly and carefully
tap it against a clean surface.
Replace the air lter insert every 100 operating hours. Replace
it immediately if there is a drop in power, drop in speed, or
smoke in the exhaust.
Before installing the lter system, check the intake opening to
make sure no dirt particles have fallen in. If they have, remove
them.
23
Replacing the spark plug
0,5 mm
7
8
13
12
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 (Order No. 965 603 021) must be replaced in
case of damage to the insulator, electrode erosion (burn) or if
the electrodes are very dirty or oily.
Remove the lter cover and hood. See Cleaning / changing
the air lter.
Pull the plug cap (7) off the spark plug. Use only the combination
wrench supplied with the saw to remove the spark plug.
CAUTION: To prevent damage to the decompression valve
(8), when unscrewing the spark plug position the combination tool in such a way that it does not impact the valve.
Electrode gap
The electrode gap must be .020" (0.5 mm).
CAUTION: Use only BOSCH WSR
6F spark plug, CHAMPION RCJ‑6Y
or NGK BPMR 7A.
Checking the ignition spark
Insert the combination tool (9) between the ventilation hood and
cylinder only as shown in the illustration.
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 (10) (unscrewed but
with the plug cap on) against the combination tool (away from
the spark plug hole!).
Switch the combination switch (11) to ”I”.
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 lter (13) of the suction head can become clogged.
It is recommended to replace the suction head once every
three months in order to ensure unimpeded fuel ow to the
carburetor.
Unscrew the tank cap (12), pull the retainer out of the opening.
Empty fuel tank.
Use a wire hook to pull the suction out of the tank opening for
replacement.
Caution:
Do not allow fuel to come into contact with skin!
24
Replacing the starter cable
18
14
16
17
15
24
17
16
Remove four screws (14). Remove starter housing (15).
Insert a small screwdriver through the cooling slits on the back
of the starter housing. Push aside the tabs (16) slightly and
carefully remove the air guide (17) from the starter housing
(15). Proceed in the order (A - B - C - D).
If replacing a starter cable that has not come apart, it will
rst be necessary to de-tension the return spring on the
cable drum.
To do this, pull the starter grip all the way out of the starter
housing.
Hold the cable drum rmly with one hand, and with the other
guide the starter cable into the recess (24) and hold it.
Now carefully let the cable drum turn counter‑clockwise until
the return spring is completely de-tensioned.
Remove all pieces of cable (18).
Thread in a new starter cable (dia 4.0 mm, length 1000 mm) as
shown (don’t forget the disc (19)) and knot both ends.
Pull knot (20) into the cable pulley (21).
CAUTION:
the outside of the cable pulley.
Pull knot (22) into the cable grip (23).
Guide the cable into the recess (24) on the cable drum and
use the cable to turn the drum two turns in the direction shown
by the arrow.
Holding the cable drum in your left hand, straighten out the twist in
the cable with your right hand, pull the cable tight, and hold.
Release the cable drum. The drum´s spring force will now wind
the cable around the drum.
Repeat three times. The starter grip must be upright on the
starter housing.
NOTE: With the cable pulled all the way out, it must still be
possible to turn the pulley another 1/4 turn against the return
spring.
Do not let the knots or the cable ends protrude from
CAUTION!
Injury hazard! When you pull out the starter cable hold the
starter handle rmly. It will whip back if the cable pulley is
released by accident.
Install the air guide (17) in reverse order. Make sure that the
tabs (16) click back into the starter housing.
When putting the starter housing back on, it may be necessary
to pull the starter handle slightly until the starting mechanism
engages.
25
1
5
4
2
Replacing the return
spring
Remove the starter housing (see “Replacing the starter
cable”).
Take the air guide off the starter housing (see “Replacing the
starter cable”).
De-tension the return spring on the cable drum (see “Replacing
the starter cable”).
Take off circlip (1) (circlip pliers, see “Accessories”).
Remove the cable pulley (2).
Evenly lever the return spring (4) out of the catch using a screwdriver or similar tool. Be extremely careful - the return spring
is under tension and can pop out of its housing!
CAUTION! Injury hazard! Wear eye protection and work
gloves when performing this work!
Replacement return springs are delivered already tensioned in
the housing. CAREFUL - the spring can pop out. If it does,
it can be put back in as shown in the diagram (observe the
direction of rotation).
Before installing the new return spring (4) in the starter hous-
ing, grease it lightly with multipurpose grease, Order No. 944
360 000. Then position it and press it until the tabs (5) engage
in the slots.
Do not grease the cable drum (2) or bearing journal!
Turn the cable pulley slightly when putting it back on, until you
hear it catch. Put the circlip back on.
Wind on the starter cable (see above under “Replacing the
starter cable”).
Reinstall the air guide (see above under “Replacing the starter
cable”)
When putting the starter housing back on, it may be necessary
to pull the starter handle slightly until the starting mechanism
engages.
26
Cutting attachment in
8 9
10 11
12
central / side position
NOTE: The Fast-Cut is delivered with the cutting attachment
mounted in the middle position (1). For cutting up against obstacles, such as curbs or walls, the cutting attachment can be
mounted to one side (2). Use this position only when actually
necessary, and afterwards return the cutting attachment to the
middle position
In this position the Fast-Cut has better balance, is easier to
guide, and is not as fatiguing for the operator.
Repositioning the cutting attachment
Loosen nuts (5).
Loosen the tightening screw (3) (counter-clockwise) until the
end of the screw (4) is visible in the gap.
Loosen and unscrew the screw (detail X, only for SC8116XL).
Unscrew the nuts (5) and remove the cover (6).
Use the combination tool (8) to lever out the stop pin (9) as
shown in the illustration, until the protective hood (11) can be
turned.
NOTE: The turn stop (7) is deactivated when the stop pin (8) is
removed. This permits the hood (11) to be turned farther than
the turn stop (7).
Unscrew the grip (10) and turn the protective hood (11) as
shown in the illustration.
Disengage the V-belt (12) and remove the cutting attachment.
NOTE: The illustration shows the V-belt for models FC7312
and FC7314).
27
Press the cutting attachment (13) onto the drive arm in the
13 1415
16
17
18
19
20
25
26
side position.
Guide the V‑belt (
NOTE: The illustration shows the V-belt for models FC7312
and FC7314).
Put the guard plate (16) on.
Screw on nuts (17) and tighten by hand.
To tighten the V-belt see ”Tightening the V-belt / Checking Vbelt tension”.
Screw in and tighten the screw (detail X, only for SC-8116XL).
Tighten the nuts (17) rmly with the combination wrench.
Replace the grip (18) as shown.
14) over the V-belt pulley (15).
IMPORTANT:
When you reposition the cutting attachment, the direction
of rotation of the cutting wheel changes.
If a rotation direction is marked on the cutting disc, make
sure the disc turns in the right direction.
Replacing/cleaning the spark arrester screen
CAUTION:
Do not use sharp or pointed objects for screen cleaning.
Damaged or misformed screen wires may result.
The spark arrester screen should be checked and cleaned
regularly.
Models without catalytic converter (SC-8116XL)
Loosen the 2 screws (19) and remove the spark arrester
screen (20). Cleaning or replacing the spark arrester screen.
Reassembly the spark arrester screen and tighten the screws.
Models with SLR mufer (FC7312, FC7314)
Unscrew and remove scre w (25 ). Re move the spa rk
arrester screen (26).
Cleaning or replacing the spark arrester screen.
Reassembly the spark arrester screen and tighten the screw.
28
Instructions for periodic maintenance
To ensure long life, prevent damage and ensure the full functioning of the safety features the following maintenance must be per-
formed regularly. Guarantee claims can be recognized only if this work is performed regularly and properly. Failure to perform the
prescribed maintenance work can lead to accidents!
Users of the Fast‑Cut must not perform any maintenance work not described in this Instruction Manual. All such work must be carried
out by a Diamond Products service center.
General Entire Fast-Cut Clean exterior, check for damage. In case of damage,
have repaired by a qualied service center immediately
Cutting disc Inspect regularly for damage and wear. 7
Clutch Have inspected at a service center.
Protection hood Clean, Check position (impact plate) 18
Before each start Cutting disc Inspect for damage and make sure the cutting wheel is 7
right for the job
V-belt Check V-belt tension 15
Protective hood Adjust position
Combination switch, Functional check
Safety locking button, Functional check
Throttle lever Functional check 18
Tank cap Check for tightness and lekages
Every day Air lter Clean (if necessary more frequently); pre‑lter (foam)
maintenance as described above under Cleaning /
changing the air lter 22-23
Idle speed Check (cutting disc must not turn on idle) 20
Extreme dust Clean lter insert (paper cartridge) 22‑23
Page
Every week Starter housing Clean to ensure proper air cooling 13
Starter cable Check for damage 25
V-belt Check V-belt tension, inspect for damage and wear 15, 21
Air lter insert Clean, replace after 100 operating hours 22‑23
Spark plug Check and replace if necessary 24
Mufer Check tightness of mounting, clean or replace 13 / 28
spark arrester screen if necessary
Every 3 months Suction head Replace 24
Fuel tank Clean
Annually Entire Fast-Cut Check at an authorized service center
Storage Entire Fast-Cut Clean exterior, check for damage. In case of damage,
have repaired by a qualied service center immediately
Cutting disc Remove and clean 14
Fuel tank Empty and clean
Carburetor Run empty
Service, spare parts and guarantee
Maintenance and repair
The maintenance and repair of modern cutoff saws and their safety‑related components requires qualied technical training and a
workshop equipped with special tools and testing devices.
We therefore recommend that you consult a Diamond Products service center for all work not described in this instruction manual.
The Diamond Products service centers have all the necessary equipment and skilled and experienced personnel, who can work out
cost-effective solutions and advise you in all matters.
Please contact your nearest service center (list enclosed) or the general trading company or importer (see last page), who will gladly
provide you with the address of your nearest Diamond Products service center.
Spare parts
Reliable long-term operation, as well as the safety of your Fast-Cut, depend among other things on the quality of the spare parts
used. Use only original Diamond Products parts, marked
Only original parts are from the same production line as the original unit and therefore ensure the highest possible quality of materials, dimensions, functioning and safety.
Only original spare parts and accessories guarantee the highest quality in material, dimensions and function.
Original spare parts and accessories can be obtained from your local dealer. He will also have the spare part lists to determine the
required spare part numbers, and will be constantly informed about the latest improvements and spare part innovations.
Please bear in mind that if parts other than original Diamond Products spare parts are used, this will automatically invalidate the
Diamond Products product guarantee.
We will furthermore not accept any liability damages arising from the use of non-Diamond Products spare parts.
29
Guarantee
Diamond Products guarantees the highest quality and will therefore reimburse all costs for repair by replacement of damaged parts
resulting from material or production faults occurring within the guarantee period after purchase. Please note that in some countries
particular guarantee conditions may exist. If you have any questions, please contact your salesman, who is responsible for the
guarantee of the product.
Please note that we cannot accept any responsibility for damage caused by:
• Disregard of the instruction manual.
• Non‑performance of the required maintenance and cleaning.
• Incorrect carburetor adjustment.
• Normal wear and tear.
• Obvious overloading due to permanent exceeding of the upper performance limits.
• The use of other than original Diamond Products cutting discs.
• Use of force, improper use, misuse or accidents.
• Damage from overheating due to dirt on the fan housing.
• Work on the Fast-Cut by unskilled persons or inappropriate repairs.
• Use of unsuitable spare parts or parts which are not original Diamond Products parts, insofar as they have caused the
damage.
• Use of unsuitable or old oil.
• Damage related to conditions arising from lease or rent contracts.
• Damages caused by disregarding loose outer bolted connections.
Cleaning, servicing and adjustment work is not covered by the guarantee. All repairs covered by the guarantee must be performed
by a Diamond Products service center.
Troubleshooting
Malfunction System
Cutting disc does not
start turning Clutch Engine runs Damage to clutch
Cutting disc runs in idle Carburetor, Cutting disc runs Incorrect idle speed,
clutch blocked clutch
V‑belt Belt has insufcient tension, V‑belt is worn
Engine does not start or Ignition system Ignition spark Malfunction in fuel supply system, com‑
only with difculty pression system, mechanical malfunction.
No ignition spark Switch on STOP, fault or short‑circuit in the
wiring, plug cap or spark plug defective.
Fuel supply Fuel tank is lled Choke in wrong position, carburetor defective,
suction head dirty, fuel line bent or interrupted.
Compression Inside Cylinder base packing ring defective, radial
system shaft packings defective, cylinder or piston rings
defective
Outside Spark plug does not seal.
Mechanical Starter does not engage Spring in starter broken, broken parts
malfunction inside the engine.
Observation Cause
Warm start difculties Carburetor Fuel tank is lled Wrong carburetor adjustment.
Ignition spark
Engine starts, but Fuel supply Fuel tank is lled Wrong idling adjustment, suction head or
dies immediately carburetor dirty.
Tank venting defective, fuel line interrupted,
cable defective, STOP switch defective.
Decompression valve dirty
Insufcient power Several systems Engine is idling Air lter dirty, wrong carburetor adjustment,
may be involved mufer clogged, exhaust channel in cylinder
simultaneously clogged, spark arrester screen clogged.
30
Notes
31
State of California Special Warning:
Warning:
This product contains a chemical known to the State of
California to cause cancer and/or birth defects or other
reproductive harm.
WARNING!
Some dust created by power sanding sawing, grinding, drilling, and other construction activities contains
chemicals known (to the State of California) to cause
cancer, birth defects or other reproductive harm.
Some examples of these chemicals are:
• lead from lead-based paints,
• crystalline silica from bricks and cement and
other masonry products, and
• arsenic and chromium from chemically treated lumber.
Your risk from these exposures varies, depending on
how often you do this type of work.
To reduce your exposure to these chemicals: work in
a well ventilated area, and work with approved safety
equipment, such as those dust masks that are specially
designed to lter out microscopic particles.
32
333 Prospect Street
ELYRIA, OHIO 44035
(800) 323-5336
http://www.diamondproducts.com
Form: 995 703 865 (2012‑03 GB)
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