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-st
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.
Thank you for purchasing Diamond Products! Congratulations on choosing a Diamond Products Fast-Cut cutoff saw! We are confident that you will be satisfied 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.
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-specific) 3. Screwdriver (for carburetor adjustment) 4. Offset screwdriver 5. Universal wrench 13/19 7. Instruction manual (not shown) In case one of the parts listed should not be included in the delivery inventory, please consult your sales agent.
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.
- - 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 work suit (H) of tough material with sufficient flame-retardant qualities whenever working with the cutoff saw. Fuels / Refuelling - Go to a safe, level place before refuelling.
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.
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 figure 15.
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 fluids. 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.
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.
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.
Technical data FC7312 FC7314 Displacement cu in (cm3) 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.
Denomination of components (Illustration shows model FC7314) 3 4 5 6 7 2 25 1 8 9 14 13 12 11 10 15 16 24 23 17 22 18 19 21 20 1 Handle 14 Decompression valve 2 Filter cover for air filter and spark plug cap 15 Starter grip 3 Cover lock 16 Air intake 4 Tubular handle 17 Combination switch „Choke, Start/Stop (I/O)” 5 Muffler 18 Safety locking button 6 Protection hood 19 Throttle lever 7 Grip 20 Tank cap (fuel) 8 V-belt tension adjusting screw 21 Starter hou
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.
Tightening the V-belt / Checking V-belt tension IMPORTANT: Exact V‑belt tension is essential for maximum cutting performance 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, retighten the V-belt after the first hour of operation! NOTE: The two fastening nuts (11) must be loosened before tightening the V-belt or checking the tension.
23 22 24 25 Fuels 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 flames, sparks or fire (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.
NOTE: For preparing the fuel-oil mixture first mix the entire oil quantity with half of the fuel required, then add the remaining fuel. Shake the finished mixture thoroughly before pouring 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.
Starting the engine if necessary This model is fitted 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 first ignition automatically closes the decompression valve.
Cold starting: Grasp front handle firmly 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).
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.
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 inspection.
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.
CAUTION: Turn off the engine before cleaning the air filter! Never clean out the air filter with compressed air! Do not clean the pre-filter and inner filter with fuel. The service life of the engine depends on the condition and regular maintenance of the filter elements.
Replacing the spark plug 7 8 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 filter cover and hood. See Cleaning / changing the air filter.
Replacing the starter cable 14 18 15 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). 16 If replacing a starter cable that has not come apart, it will first be necessary to de-tension the return spring on the cable drum.
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”). 5 Remove the cable pulley (2). Evenly lever the return spring (4) out of the catch using a screwdriver or similar tool.
Cutting attachment in 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.
Press the cutting attachment (13) onto the drive arm in the side position. Guide the V-belt (14) over the V-belt pulley (15). NOTE: The illustration shows the V-belt for models FC7312 and FC7314). 13 15 14 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”. 18 Screw in and tighten the screw (detail X, only for SC-8116XL). Tighten the nuts (17) firmly with the combination wrench.
Instructions for periodic maintenance To ensure long life, prevent damage and ensure the full functioning of the safety features the following maintenance must be performed 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.
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.
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.
