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Concrete cutter
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- Contents
- Table of Contents
- Troubleshooting
- Bookmarks
Table of Contents
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Table of Contents
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Key to Symbols
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Machine's Safety Equipment
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Cutting Blades
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Assembling and Adjustments
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Fuel Handling
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Operating
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Starting and Stopping
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Maintenance
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Troubleshooting
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Technical Data
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Exploded View and Parts List
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Warranty
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DACNQ740S
Concrete cutter
USER'S MANUAL
www.daewoopowerproducts.com
Manufactured under license of Daewoo International Corporation, Korea
Table ofContents
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Table of Contents
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Summary of Contents for Daewoo DACNQ740S
- Page 1 DACNQ740S Concrete cutter USER'S MANUAL www.daewoopowerproducts.com Manufactured under license of Daewoo International Corporation, Korea...
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Page 2: Table Of Contents
INDEX 1. KEY TO SYMBOLS............................ 2. MACHINE'S SAFETY EQUIPMENT......................4 3. CUTTING BLADES........................... 7 4. ASSEMBLING AND ADJUSTMENTS.....................13 5. FUEL HANDLING.............................16 6. OPERATING.............................19 7. STARTING AND STOPPING........................8. MAINTENANCE............................32 9. TROUBLESHOOTING..........................38 10. TECHNICAL DATA..........................39 11. EXPLODED VIEW AND PARTS LIST....................40 WARRANTY..............................46... -
Page 3: Key To Symbols
1. KEY TO SYMBOLS This manual is the International version used for all English speaking countries outside North Ameri- ca. If you operate in North America use the US-version. Symbols on the machine WARNING! The machine can be a dangerous tool if used incorrectly or carelessly, which can cause serious or fatal injury to the operator or others. - Page 4 Cutting equipment decal A= Cutting blade diameter B= Max. speed of output shaft C= Max blade thickness D= Direction of blade rotation E= Bushing dimension Noise emission to the environment according to the European Community's Directive. The machine's emission is speci ed in the Technical data chapter and on the label.
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Page 5: Machine's Safety Equipment
2. MACHINE'S SAFETY EQUIPMENT General This section describes the machine's safety equipment, its purpose, and how checks and mainte- nance should be carried out to ensure that it operates correctly. Throttle trigger lockout The throttle trigger lock is designed to prevent accidental operation of the throttle. When the lock (A) is pressed in this releases the throttle (B). - Page 6 - Check that the throttle trigger and throttle lockout move freely and that the return springs work properly. - Start the power cutter and apply full throttle. Release the throttle control and check that the cutting blade stops and remains stationary. If the cutting bladec rotates when the throttle is in the idle position you should check the carburettor's idle adjustment.
- Page 7 Checking the blade and the blade guard - Check that the guard over the culling blade is not cracked or damaged in any other way. Replace when damaged. - Check that the cutting blade is tted correctly and does not show signs of damage. A damaged culling blade can cause personal injury.
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Page 8: Cutting Blades
Muf er The muf er is designed to keep noise levels to a minimum and to direct exhaust fumes away from the user. Inspecting the muf er Check regularly that the muf er is complete and secured correctly. 3. CUTTING BLADES... - Page 9 - Cutting blades are available in two basic designs; abrasive blades and diamond blades. - High-quality blades are often most economical. Lower quality blades often have inferior cutting capacity and a shorter service life, which results in a higher cost in relation to the quantity of mate- rial that is cut.
- Page 10 - Only specialty blades. Hand held, high speed machines - Many cutting blades that might t this power cutter are intended for stationary saws and have a lower speed rating than is needed for this hand-held saw. Cutting blades with a lower speed rating shall never be used on this saw.
- Page 11 - The cutting material on abrasive blades consists of grit bonded using an organic binder. "Reinfor- ced blades" are made up of a fabric or bre base that prevents total breakage at maximum working speed if the blade should be cracked or damaged. - A cutting blade's performance is determined by the type and size of abrasive corn, and the type and hardness of the bonding agent.
- Page 12 - Diamond blades consist of a steel core provided with segments that contain industrial diamonds. - Diamond blades ensure lower costs per cutting operation, fewer blade changes and a constant cutting depth. - When using diamond blades make sure that it rotates in the direction indicated by the arrow on the blade.
- Page 13 Diamond blades for wet cutting - Wet cutting diamond blades must be used with water to keep the blade core and segments cool during sawing. - Wet cutting blades should NOT be used dry. - Using wet cutting blades without water can cause excessive heat build-up, resulting in poor performance, severe blade damage and is a safety hazard.
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Page 14: Assembling And Adjustments
Use of this power cutter with a carbide tipped blade is a violation of work safety regulations. Due to the hazardous nature and exigent circ*mstances involved with re ghting and rescue ope- rations conducted by the various highly trained public safety forces, safety professionals ( re departments), e are aw re that they may use this power cutter with carbide tipped blades in certain emergency situations due to the ability of carbide tipped blades to cut many different types of obstructions and materials in combination without having to take time to switch blades or machines. - Page 15 Do not use warped, notched, indented or dirty ange washers. Do not use different dimensions of ange washers. Checking the arbor bushing The arbor bushings are used to t the machine to the centre hole of the cutting blade. The machine is supplied with either a bushing that can be ipped over to t blades with either 20 mm or 1"...
- Page 16 - Lock the shaft. Insert a tool in the hole in the cutting head and rotate the blade until it is locked. - Tightening torque for the bolt holding the blade is: 25 Nm (215 in.lb). Blade guard The guard for the cutting equipment should be adjusted so that the rear section is ush with the work piece.
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Page 17: Fuel Handling
- The cutting head is now loose and can be removed from the machine. Remove the belt from the belt pulley. - Rotate the bearing housing to opposite direction and reassemble the stop. 5. FUEL HANDLING General WARNING! Running an engine in a con ned or badly ventilated area can result in death due to asphyxiation or carbon monoxide poisoning. - Page 18 Fuel NOTICE! The machine is equipped with a two-stroke engine and must always be run using a mixture of petrol and two-stroke oil. It is important to accurately measure the amount of oil to be mixed to ensure that the correct mixture is obtained. When mixing small amounts of fuel, even small inaccuracies can drastically affect the ratio of the mixture.
- Page 19 Mixing ratio Fueling WARNING! Taking the following precautions, will lessen the risk of re: Do not smoke and do not place any hot objects in the vicinity of fuel. Always stop the engine and let it cool for a few minutes before refuelling. The engine should be switched off, and the stop switch in STOP position.
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Page 20: Operating
Transport and storage - Store and transport the machine and fuel so that there is no risk of any leakage or fumes coming into contact with sparks or open ames, for example, from electrical machinery, electric motors, electrical relays/ switches or boilers. - When storing and transporting fuel always use approved containers intended for this purpose. - Page 21 Other protective equipment CAUTION! Sparks may appear and start a re when you work with the machine. Always keep re ghting equipment handy. - Fire Extinguisher - Always have a rst aid kit nearby General safety precautions This section describes basic safety directions for using the machine. This information is never a substitute for professional skills and experience.
- Page 22 Other protective equipment CAUTION! Sparks may appear and start a re when you work with the machine. Always keep re ghting equipment handy. - Fire Extinguisher - Always have a rst aid kit nearby General safety precautions This section describes basic safety directions for using the machine. This information is never a substitute for professional skills and experience.
- Page 23 WARNING! Unauthorized modi cations and/or accessories may lead to serious injury or death to the user or others. Under no circ*mstances may the design of the machine be modi ed without the permission of the manufacturer. Do not modify this product or use it if it appears to have been modi ed by others. Never use a machine that is faulty.
- Page 24 Basic working techniques WARNING! Do not pull the power cutter to one side, this can cause the blade to jam or break resulting in injury to people. Under all circ*mstances avoid grinding using the side of the blade; it will almost certainly be damaged or break and can cause immense damage.
- Page 25 - Maintain a safe distance from the cutting blade when the engine is running. - Never leave the machine unsupervised with the motor running. - Never move the machine when the cutting equipment is rotating. Make sure that the blade has come to a complete stop before the machine is put on the ground.
- Page 26 - Move the blade slowly forwards and backwards to achieve a small contact area between the blade and the material to be cut. This reduces the temperature of the blade and ensures effective culling. Managing dust The machine is tted with a low ushing water kit that offers maximum dust suppression. Use wet culling blades with water cooling when possible for optimal dust management.
- Page 27 - Full protective re ghting gear shall be worn by the operator at all times. - A full face shield (not just protective eye glasses) shall be worn by the operator to protect the face from ying debris or a sudden kick-back of the power cutter. Risk area No persons that do not have the protective equipment described above shall be allowed inside the risk area for thrown material.
- Page 28 Before each rescue operation Check that the blade and the blade guard are not damaged or cracked. Replace the blade or the blade guard if it has been exposed to impact or is cracked. - Check that no carbide tips have loosened from the cutting blade. - Check that the blade is not skew or shows signs of cracking or other defects.
- Page 29 Kickback zone Never use the kickback zone of the blade for cutting. If the blade is pinched or stalled in the kick- back zone, the reactive force will push the power cutter up and back towards the user in a rotating motion causing serious or even fatal injury.
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Page 30: Starting And Stopping
If the pipe is allowed to sag and close the cut, the blade will be pinched in the kick back zone and a severe kick back might develop. If the pipe is properly supported the end of the pipe will move downward, the cut will open and no pinching will occur. - Page 31 WARNING! Note the following before starting: Please read the operator's manual carefully and make sure you understand the instructions before using the machine. Wear personal protective equipment. See under heading "Personal protective equipment". Do not start the machine without the belt and belt guard tted. Otherwise the clutch could come loose and cause personal injuries.
- Page 32 - Grip the front handle with your left hand. Put your right foot on the lower section of the rear handle pressing the machine against the ground. Pull the starter handle with your right hand until the engine starts. Never twist the starter cord around your hand. - Push in the choke control as soon as the engine starts, with the choke pulled out the engine will stop after a few seconds.
- Page 33 When the machine starts, press the throttle trigger to disengage the start throttle, and the machine will idle. NOTICE! Pull with your right hand out the starter cord slowly until you feel a resistance (as the starter pawls engage) and then pull rmly and rapidly. Do not pull the starter cord all the way out and do not let go of the starter handle when the cord is fully extended.
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Page 34: Maintenance
8. MAINTENANCE General WARNING! The user must only carry out the maintenance and service work des- cribed in this Operator's Manual. More extensive work must be carried out by an authorized service workshop. The engine should be switched off, and the stop switch in STOP position. Wear personal protective equipment. - Page 35 NOTICE! A dirty or blocked air intake results in the machine overheating which causes damage to the piston and cylinder. Spark plug - If the machine is low on power, dif cult to start or runs poorly at idle speed: always check the spark plug rst before taking other steps.
- Page 36 - Wiggle the blade guard (E) up and down 3-5 times, and then tighten the nuts (A) with the combina- tion spanner. Replacing the drive belt WARNING! Never start the engine when ! the belt pulley and clutch are removed for maintenance.
- Page 37 Fit the belt guards and tighten the nuts (A) nger tights. Wiggle the blade guard (E) up and down 3-5 limes, and then lighten the nuts (A) with the combination spanner. Carburettor The carburettor is equipped with xed needles to ensure the machine always receives the correct mix1ure of fuel and air.
- Page 38 Starter housing WARNING! When the recoil spring is wound up in the starter housing it is under tension and can, if handled carelessly, pop out and cause personal injury. Always be careful when changing therecoil spring or the starter cord. Always wear protective goggles.
- Page 39 - Check the air lter and replace if necessary. Replacing the air lter CAUTION! Unhealthy dust can be spread during lter change. Wear approved respiratory protection. Dispose of lters correctly. NOTICE! The air lter must not be cleaned or blown clean with compressed air. This will damage the lter.
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Page 40: Troubleshooting
9. TROUBLESHOOTING Troubleshooting schedule WARNING! If service operations or troubleshooting does not require the machine to be on, the engine should be switched off, and the stop switch in STOP position. -
Page 41: Technical Data
10. TECHNICAL DATA DACNQ740S Engine Displacement: 74cc Engine type: 2 Stroke Power kW: 3.5 kW/8000r/min Max engine speed: 9500r/min Fuel tank capacity: 1100ml Blade diameter: 350mm Max cutting depth: 125mm Bore diameter: 25.4mm... -
Page 42: Exploded View And Parts List
11. EXPLODED VIEW AND PARTS LIST... - Page 43 Square Nut M5 Shock spring seat Cross self-tapping screw 5*16 Shock spring Fuel tank lower guard plate Switch Fuel tank Control arm Trigger Trigger spring Pin 3*38 Throttle push rod Oil pipe Fuel filter O-ring 3*25 Oil cap Oil bubble Inlet pipe Oil return pipe Throttle lever...
- Page 44 Flywheel Flameout line Half round key 3*13 Big cross head M5*8 Oil plate of left crankcase Oil seal 15*26*5 Crankcase Crankcase rubber shock Crankcase gasket Pin sleeve 5*7*12 Open bearing 6202 Crankshaft cover Crankshaft Needling 12*15*14.7 Piston pin spring 12 Piston pin 12*33 Piston Piston ring...
- Page 45 Vent connector U-shaped bead Filter Intake pipe bushing Intake elbow Intake pipe fixing iron Hexagon socket head combination screw M5*55 Intake pipe holder Adjust the cam Hexagon socket head combination screw M5*45 Right crankcase oil seal pressure plate Clutch drum bearing gasket Bearing 6001 Clutch drum Gasket 10*22*3...
- Page 46 Limit sleeve Handle fixed block Right support foot Left support foot Hexagon socket head combination screw M5*40 Lower guard Hexagonal nut M10*1 reverse tooth Large pulley Hexagon socket head combination screw M6*40 Pin sleeve Locking spring Output shaft Stud M8*55 Fixed plate Closed bearing 6202 Dust cover...
- Page 47 EC DECLARATION OF CONFORMITY Model Name: Gasoline Concrete cutter Model Code: DACNQ740S Brand: Daewoo We GBR Corp. LTD, Room 1002, 10/F., David House, 8-20 Nanking Street, Jordan, Kowloon, Hong Kong, China, declare under our sole responsibility that this product is in conformity and accordance with the following standards and regulations.
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Page 48: Warranty
WARRANTY CARD Product model Date of sale Company Serial number Client's signature Username The product is in good conditions and fully complete. Read and agree the terms of the warranty. GUARANTEE The warranty period starts from the date of sale of the products and covers 2 years for all power products. During the warranty period, free failures caused due to the use of poor-quality materials in the production and manufacturer workmanship admitted fault are removed. - Page 49 Manufactured under license of Daewoo International Corporation, Korea...
