Operator′s manual K750 Please read the operator’s manual carefully and make sure you understand the instructions before using the machine.
KEY TO SYMBOLS Key to symbols 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. Please read the operator’s manual carefully and make sure you understand the instructions before using the machine. Always wear: • Protective helmet • Hearing protection • Protective goggles or a visor • Breathing mask This product is in accordance with applicable EC directives.
CONTENTS Contents KEY TO SYMBOLS Key to symbols ............................................................. CONTENTS Contents ...................................................................... WHAT IS WHAT? What is what on the power cutter? ............................... SAFETY INSTRUCTIONS Steps before using a new power cutter. ....................... Personal protective equipment ..................................... Machine′s safety equipment ........................................
WHAT IS WHAT? 1 2 3 4 5 18 6 17 16 7 14 15 13 12 11 10 9 8 25 19 20 21 22 23 24 27 26 What is what on the power cutter? 1 Front handle 15 Fuel tank 2 Water tap 16 Decompression valve 3 Warning decal 17 Guard for the blade 4 Air filter cover 18 Adjustment handle for guard 5 Cylinder cover 19 Belt guard 6 Choke 20 Water connection with filter 7 Throttle lockout 21 Cutting arm 8 Throttle control 22 Rating plate 9 Start throttle lock 23 Belt tensioner 10 Stop switch
SAFETY INSTRUCTIONS Steps before using a new power cutter. • Please read the operator’s manual carefully. • Check the cutting blade’s mounting, see the chapter ”Assembly”. • Start the engine and check the idling setting, see instructions under the heading Maintenance. When the carburettor is set correctly the cutting blade should be still while idling. Setting of the idle speed is described in the Operator’s Manual. Set the correct speed according to these instructions.
SAFETY INSTRUCTIONS Machine′s safety equipment This section describes the machine′s safety equipment, its purpose, and how checks and maintenance should be carried out to ensure that it operates correctly. See the ”What is what?” section to locate where this equipment is positioned on your machine. ! WARNING! Never use a machine that has faulty safety equipment! Carry out the inspection, maintenance and service routines listed in this section.
SAFETY INSTRUCTIONS Checking, maintaining and servicing the machine′s safety equipment ! WARNING! All servicing and repair work on the machine requires special training. This is especially true of the machine′s safety equipment. If your machine fails any of the checks described below you must contact your service agent. When you buy any of our products we guarantee the availability of professional repairs and service.
SAFETY INSTRUCTIONS General safety precautions • • A power cutter is designed to cut hard materials, such as masonry. Observe the increased risk of kickback when cutting soft materials. See instructions under the heading How to avoid kickback. Do not use the power cutter until you have read the entire contents of this Operator’s Manual.
SAFETY INSTRUCTIONS General working instructions Cutting ! ! WARNING! This section describes basic safety directions for using a power cutter. This information is never a substitute for professional skills and experience. If you get into a situation where you feel unsafe, stop and seek expert advice. Contact your dealer, service agent or an experienced power cutter user. Do not attempt any task that you feel unsure of! General • Start cutting with the machine running at maximum speed.
SAFETY INSTRUCTIONS • • 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 cutting. Feed down the machine in line with the blade. Pressure from the side can damage the blade and is very dangerous. How to avoid kickback ! WARNING! Kickback can happen very suddenly and violently; kicking the power cutter and cutting blade back at the user.
SAFETY INSTRUCTIONS Pinching/rotation If the cut is pressed together this can lead to jamming. The machine can be pulled down suddenly with a very powerful jerk. Water cooling ! How to avoid pinching Support the work piece in such a way that the cut remains open during the cutting operation and when the cut is finished. WARNING! Water cooling, which is used when cutting concrete, cools the blade and increases its service life while also reducing the formation of dust.
SAFETY INSTRUCTIONS Ensure the blade it not cracked or damaged in any other way. Diamond blades for dry cutting Diamond blades for dry cutting are a new generation of blades that do not require water cooling. However, the blades will still be damaged by excessive heat. It is most economical to allow the blade to cool by simply lifting it out from the cut every 30–60 seconds and letting it rotate in the air for 10 seconds.
ASSEMBLY Checking the drive axle and flange washers The shaft can be locked using a screwdriver, steel pin or the like. This is slid in as far as possible. The blade is tightened clockwise. Check that the threads on the drive shaft are undamaged. Check that the contact surfaces on the blade and the flange washers are undamaged, of the correct dimension, clean, and that they run properly on the drive axle.
FUEL HANDLING Fuel • Mix (shake) the fuel mixture thoroughly before filling the machine’s fuel tank. • Do not mix more than one month’s supply of fuel at a time. • If the machine is not used for some time the fuel tank should be emptied and cleaned. CAUTION! The machine is equipped with a two-stroke engine and must always been run using a mixture of petrol and twostroke engine oil. It is important to accurately measure the amount of oil to be mixed to ensure that the correct mixture is obtained.
FUEL HANDLING Disconnection function for OilGuard Fuelling Machines fitted with OilGuard have a built-in system for identifying incorrect fuel mixtures. Once the machine is running, a detector reads the fuel quality which takes about ten seconds. If the correct amount of Husqvarna OilGuard oil has been used, the machine will run at a normal speed. If the wrong type of oil has been used, the machine senses this and restricts the speed of the engine to 3,800 rpm to avoid damaging the engine.
STARTING AND STOPPING Starting and stopping ! WARNING! Note the following before starting: Starting a warm engine Use the same starting procedure as for a cold engine but without setting the choke control in the choke position. Do not start the power cutter without the belt guard fitted. Otherwise the clutch could come loose and cause personal injuries. Always move the machine away from the refuelling area before starting.
MAINTENANCE Tensioning the drive belt • 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. • The drive belt is fully enclosed and well protected from dust and dirt. • When the drive belt is to be tensioned, release the bolts holding the cutting arm.
MAINTENANCE Adjusting the idle speed 1 Adjust the idle speed using the T screw. When an adjustment is necessary, first turn the screw clockwise until the blade starts to rotate. Now turn the screw anti-clockwise until the blade stops rotating. The foam plastic filter is easily accessible under the filter cover A. This filter should be checked weekly and replaced if necessary. A B T In order to obtain a good filtering effect, the filter must be replaced regularly or cleaned and oiled.
MAINTENANCE Starter ! Guide the cord through the cut-out in the periphery of the pulley and wind the cord 3 times clockwise around the centre of the starter pulley. 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 the recoil spring or the starter cord. Always wear protective goggles.
MAINTENANCE • Remove the recoil spring by turning the starter over and loosen the hooks, with the help of a screwdriver. The hooks hold the return spring assembly on the starter. Cooling system To keep the working temperature as low as possible the machine is equipped with a cooling system. The cooling system consists of: 5 4 • Lubricate the recoil spring with light oil. Fit the pulley and tension the recoil spring.
MAINTENANCE General maintenance instructions Below you will find some general maintenance instructions. If you have more questions, contact your service agent. 4 8 12 9 3 10 19 15 17 5 18 6 16 2 14 13 17 7 1 11 Daily maintenance 1 Check that the components of the throttle control work smoothly (throttle control and throttle trigger lock). 2 Check the tension of the drive belt. 3 Check the condition of the blade and the drive gear. 4 Check the condition of the blade guard.
TECHNICAL DATA Technical data Engine Cylinder displacement, K750 cm3 74 Cylinder bore, mm 51 Stroke, mm 36 Idle speed, rpm 2700 Recommended max.
TECHNICAL DATA EC-declaration of conformity (Applies to Europe only) Husqvarna Construction Products, SE-433 81 Partille, Sweden, tel: +46-31-949000, declares under sole responsibility that the power cutter K750 from year 2006 serial numbers and onward (the year is clearly stated in plain text on the rating plate with subsequent serial number) conforms with the requirements of the COUNCIL’S DIRECTIVE: • of June 22, 1998 ”relating to machinery” 98/37/EC, annex IIA.
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