Operator’s manual K 770, K 770 Rescue, K 770 OilGuard Please read the operator’s manual carefully and make sure you understand the instructions before using the machine.
KEY TO SYMBOLS Manual version Starter handle This manual is the International version used for all English speaking countries outside North America. If you operate in North America use the US-version. Refuelling, petrol/oil mix Symbols on the machine Wear personal protective equipment. See instructions under the ”Personal protective equipment” heading. This product is in accordance with applicable EC directives. WARNING! Dust forms when cutting, this can cause injuries if inhaled.
KEY TO SYMBOLS Explanation of warning levels The warnings are graded in three levels. WARNING! ! WARNING! Indicates a hazardous situation which, if not avoided, will result in death or serious injury. CAUTION! ! CAUTION! Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury. NOTICE! NOTICE! Is used to address practices not related to personal injury.
CONTENTS Contents KEY TO SYMBOLS Manual version ...................................................... Symbols on the machine ...................................... Explanation of warning levels ............................... CONTENTS Contents ............................................................... PRESENTATION Dear Customer, ..................................................... Design and features ..............................................
PRESENTATION Dear Customer, Design and features Thank you for choosing a Husqvarna product! This Husqvarna power cutter is a portable handheld cutoff machine designed to cut hard materials like concrete, masonry, stone and steel, and should not be used for any purpose not described in this manual. Safe operation of this product requires the operator to read this manual carefully. Ask your Husqvarna dealer if you need more information.
PRESENTATION Reversible cutting head The machine is fitted with a reversible cutting head allowing cutting close to a wall or at ground level, restricted only by the thickness of the blade guard. Smart Tension A semi automatic belt tensioning system with a spring loaded mechanism which makes it easy to get the correct belt tension. It is also very easy to change the drive belt and reverse the cutting head.
PRESENTATION 1 What is what on the power cutter - K 770, K 770 OilGuard? 1 Front handle 17 Adjustment handle for guard 2 Water valve 18 Blade guard 3 Warning decal 19 Decompression valve 4 Air filter cover 20 Air purge 5 Starting instruction decal 21 Fuel cap 6 Cylinder cover 22 Water connection with filter 7 Choke control with start throttle lock 23 Belt guard 8 Throttle trigger lockout 24 Belt tensioner 9 Throttle trigger 25 Rating plate 10 Stop switch 26 Cutting arm 11 Disc
PRESENTATION 1 2 3 4 14 5 13 16 6 15 7 18 17 12 11 19 10 9 8 20 26 21 22 23 24 25 27 What is what on the power cutter - K 770 Rescue? 1 Front handle 15 Blade guard 2 Warning decal 16 Adjustment handle for guard 3 Air filter cover 17 Decompression valve 4 Starting instruction decal 18 Air purge 5 Cylinder cover 19 Fuel cap 6 Choke control with start throttle lock 20 Adjustable carry strap 7 Throttle trigger lockout 21 Belt guard 8 Throttle trigger 22 Belt tension
MACHINE´S SAFETY EQUIPMENT General ! • 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 blade rotates when the throttle is in the idle position you should check the carburettor’s idle adjustment. See instructions in the section "Maintenance".
MACHINE´S SAFETY EQUIPMENT Blade guard ! Checking the vibration damping system WARNING! Always check that the guard is correctly fitted before starting the machine. This guard is fitted above the cutting blade and is designed to prevent parts of the blade or cutting fragments from being thrown towards the user. ! WARNING! The engine should be switched off, and the stop switch in STOP position. • Check the vibration damping units regularly for cracks or deformation. Replace them if damaged.
CUTTING BLADES General ! Cutting blades for different materials WARNING! A cutting blade may burst and cause injury to the operator. ! Never use a diamond blade to cut plastic material. The heat produced during cutting may melt the plastic and it can stick to the cutting blade and cause a kickback. The cutting blade manufacturer issues warnings and recommendations for the use and proper care of the cutting blade. Those warnings come with the cutting blade.
CUTTING BLADES Blade vibration • The blade can become out-of-round and vibrate if an excessive feed pressure is used. • A lower feed pressure can stop the vibration. Otherwise replace the blade. Diamond blades General ! Abrasive blades ! WARNING! Do not use abrasive blades with water. The strength is impaired when abrasive blades are exposed to water or moisture, which results in an increased risk of the blade breaking.
CUTTING BLADES Diamond blades and cooling • During cutting the friction in the cut causes the diamond blade to be heated up. If the blade is allowed to get too hot this can result in loss of blade tensioning or core cracking. Toothed blades, carbide tipped blades and emergency situations ! Diamond blades for dry cutting • Although no water is required for cooling, dry cutting blades must be cooled with air flow around the blades.
ASSEMBLING AND ADJUSTMENTS General ! WARNING! The engine should be switched off, and the stop switch in STOP position. Checking the direction of the blade rotation • Husqvarna’s blades are high speed blades approved for hand held power cutters. When using diamond blades make sure that it rotates in the direction indicated by the arrow on the blade. The direction of rotation for the machine is shown by arrows on the cutting arm.
ASSEMBLING AND ADJUSTMENTS Disengaging OilGuard (K 770 OilGuard) • When the machine is delivered, the OilGuard plug (A) and the blue indicator pin (B) are fitted in the tank. • If you are in a situation where you do not have access to Husqvarna OilGuard oil, but you have oil of a similar quality, you can deactivate the OilGuard system using the disconnection function. • To deactivate the function, pry off the OilGuard plug using a screwdriver and then break off the indicator pin.
ASSEMBLING AND ADJUSTMENTS • Attach the cutting head to the other side of the cutting arm. Cutting trolley (Accessory) A cutting trolley makes it easier to cut in floors and roads, especially long cuts at a fixed depth. Quick connections makes it easy to install the cutter on the trolley. Turn the belt tensioner (B) to position ”1” to tighten the drive belt. B • Fit the belt guard to the reversed cutting head.
FUEL HANDLING General ! WARNING! Running an engine in a confined or badly ventilated area can result in death due to asphyxiation or carbon monoxide poisoning. Use fans to ensure proper air circulation when working in trenches or ditches deeper than one meter. Two-stroke oil • For best results and performance use HUSQVARNA two-stroke engine oil, which is specially formulated for our air-cooled two-stroke engines.
FUEL HANDLING Fueling Long-term storage • ! WARNING! Taking the following precautions, will lessen the risk of fire: 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. OilGuard (K 770 OilGuard) • Machines fitted with OilGuard have a built-in system for identifying incorrect fuel mixtures.
OPERATING Protective equipment General safety precautions General This section describes basic safety directions for using the machine. This information is never a substitute for professional skills and experience. • Do not use the machine unless you are able to call for help in the event of an accident. • Please read the operator’s manual carefully and make sure you understand the instructions before using the machine.
OPERATING ! WARNING! Unauthorized modifications and/or accessories may lead to serious injury or death to the user or others. Under no circumstances may the design of the machine be modified without the permission of the manufacturer. Do not modify this product or use it if it appears to have been modified by others. • Ensure that the working area is sufficiently illuminated to create a safe working environment.
OPERATING • Never cut asbestos materials! • Hold the saw with both hands; keep a firm grip with thumbs and fingers encircling the handles. The right hand should be on the rear handle and the left hand on the front handle. All operators, weather right or left handed shall use this grip. Never operate a power cutter holding it with only one hand. • Stand parallel to the cutting blade. Avoid standing straight behind. In the event of a kickback the saw will move in the plane of the cutting blade.
OPERATING Cutting with toothed/carbide tipped blades during rescue operations WARNING! A power cutter should never be used with carbide tipped blade for non-emergency work, such as in the construction trades. ! Be aware at all times that carbide tipped blades are more kickback prone than abrasive or diamond blades if not used properly.
OPERATING Kickback ! kickback zone. Use the lower quadrant of the blade to avoid climbing kickback. WARNING! Kickbacks are sudden and can be very violent. The power cutter can be thrown up and back towards the user in a rotating motion causing serious or even fatal injury. It is vital to understand what causes kickback and how to avoid it before using the machine. Kickback is the sudden upward motion that can occur if the blade is pinched or stalled in the kickback zone.
OPERATING end of the pipe will move downward, the cut will open and no pinching will occur. Proper sequence cutting a pipe 1 First cut section I. 2 Move to side II and cut from section I to bottom of the pipe. 3 Move to side III and cut the remaining part of the pipe ending at the bottom. I III II How to aviod kickback Avoiding kickback is simple. • The work piece must always be supported so that the cut stays open when cutting through. When the cut opens there is no kickback.
STARTING AND STOPPING Before starting ! automatically returns to its initial position when the machine starts. 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 fitted. Otherwise the clutch could come loose and cause personal injuries.
STARTING AND STOPPING With a warm engine: • • When the machine starts, press the throttle trigger to disengage the start throttle, and the machine will idle. Make sure that the stop switch (STOP) is in the left position. NOTICE! Pull with your right hand out the starter cord slowly until you feel a resistance (as the starter pawls engage) and then pull firmly and rapidly. • Set the choke control in the choke position. The choke position is also the automatic start throttle position.
MAINTENANCE General ! WARNING! The user must only carry out the maintenance and service work described 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. See under heading ”Personal protective equipment”.
MAINTENANCE Cleaning External cleaning • Clean the machine daily by rinsing it with clean water after the work is finished. When the machine is equipped with a friction retarder, a scraping sound can be heard from the bearing housing when the blade is turned by hand. This is quite normal. Please contact an accredited Husqvarna workshop if you have any questions. Cooling air intake The drive belt is enclosed and well protected from dust and dirt. • • Clean the cooling air intake when needed.
MAINTENANCE • Remove the upper belt guard. • Now remove the rear belt guard. Adjusting the idle speed CAUTION! Contact your dealer/service workshop, if the idle setting cannot be adjusted so that the blades are stationary. Do not use the machine until it has been properly adjusted or repaired. ! Start the engine and check the idling setting. When the carburettor is set correctly the cutting blade should be still while engine is idling. • • Adjust the idle speed using the T screw.
MAINTENANCE • Pull the cord out about 30 cm and lift it into the cut-out in the periphery of the starter pulley. When the cord is intact: Release the spring tension by letting the pulley rotate slowly backwards. Changing a broken recoil spring • Undo the bolt in the centre of the pulley and remove the pulley. • • • Remove any remnants of the old starter cord and check that the return spring works. Insert the new starter cord through the hole in the starter housing and in the cord pulley.
MAINTENANCE Fuel system Drive gear, clutch General • • Check that the fuel cap and its seal are not damaged. • Check the fuel hose. Replace when damaged. Fuel filter • The fuel filter sits inside the fuel tank. • The fuel tank must be protected from contamination when filling. This reduces the risk of operating disturbances caused by blockage of the fuel filter located inside the tank. • The filter cannot be cleaned but must be replaced with a new filter when it is clogged.
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. Problem The machine does not start The blade rotates at idle The blade does not rotate while throttling up The machine has no power while attempting to throttle up Probable cause Potential Solution Incorrect starting procedure. See instructions under the heading Starting and stopping.
TECHNICAL DATA Technical data K 770, K 770 OilGuard, K 770 Rescue Cylinder displacement, cm3/cu.in 74/4.5 Cylinder bore, mm/inch 51/2 Stroke, mm/inch 36/1.4 Idle speed, rpm 2700 Wide open throttle - no load, rpm 9300 (+/- 150) Power, kW/hp @ rpm 3.7/5 @ 9000 Spark plug NGK BPMR7A Electrode gap, mm/inch 0.5/0.02 Fuel tank capacity, litre/US fl. Oz 0.9/30 Recommended water pressure, bar/PSI 0.5-10/7-150 Weight 12” (300 mm) 14” (350 mm) 10/22 10.1/22.
TECHNICAL DATA EC Declaration of Conformity (Applies to Europe only) Husqvarna AB, SE-561 82 Huskvarna, Sweden, tel +46-36-146500, declares under sole responsibility that the portable cut-off machines Husqvarna K 770, K 770 OilGuard, K 770 Rescue from 2018’s serial numbers and onwards (the year is clearly stated in plain text on the rating plate with subsequent serial number), complies with the requirements of the COUNCIL’S DIRECTIVES: • of May 17, 2006 ”relating to machinery” 2006/42/EC.
TECHNICAL DATA English – 35
GB - Original instructions 1158925-26, rev 2 ´®z+Z|T¶6B¨ ´®z+Z|T¶6B¨ 2018-10-18
