Husqvarna K1270 Workshop Manual
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Husqvarna K1270 Workshop Manual

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K1270
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  • Page 1 Workshop Manual K1270 English...

  • Page 3: Table Of Contents

    Clutch ............66 Cutting head ..........70 Wet system ..........75 Handle ............76 Troubleshooting ........81 Husqvarna AB has a policy of continuous product development and therefore reserves the right to modify the design and appearance of products without prior notice.

  • Page 4: Index

    Index 1. INDEX Air duct ............... 22 Handle ..............75 Air filter ............20,35 Air Filter service ..........35 Ignition module ..........29,32 Anti-vibration ............23 Ignition system ............ 29 Inlet manifold ..........22,36 Basic modules ............ 17 Inlet nozzle ............23 Bearing ...............
  • Page 5 Index English -...

  • Page 6: Introduction And Safety

    2.5. TOOLS Special tools are required for some stages. All service tools are listed in the Workshop Manual. Usage is made apparent in each section. Always use Husqvarna’s original: • Spare parts • Service tools • Accessories - English...
  • Page 7 Introduction and safety instructions 2.8. GENERAL INSTRUCTIONS 2.10. SYMBOLS ON THE MACHINE The workshop where the machine is to be repaired The symbols below are embedded on the machine must be equipped with safety equipment in accord- ance with local regulations. No one may repair the machine unless they have Choke control read and understood the content of this Workshop...

  • Page 8: Technical Data

    CYLINDER K1270 K1260 K1260 Model K1260 is equipped with a chill casted cylinder with integrated scavenging port. K1270 Model K1270 is equipped with a die cast cylinder with lids. CYLINDER FOR K1270 AND K1260 INLET MANIFOLD K1270 K1260 K1260 After dismantling the carburettor the inlet manifold can be removed.
  • Page 9 Then dismantel the flange washer, the dust protec- tion and finally the three screws and the plate. K1270 First dismantle the belt guard and the front pulley. Then dismantle the four screws and the springs. DISMANTLING THE BLADE GUARD FOR K1260 AND K1270 English -...
  • Page 10 K1260 The air filter cover of K1260 consists of two parts. K1270 The air filter cover of K1270 consists of one sigle part. The cover is equiped with a button for the decompression valve. AIR FILTER COVER FOR K1260 AND K1270...

  • Page 11: Engine Special Tools

    531 03 06-23 Flywheel puller Pressure tester Kit consisting of pump Puller for the flywheel. Fits with pressure gauge and all petrol-driven Husqvarna nozzles, hose and sealing cutters. plug for universal use. • Dismantling the flywheel. • Leakage testing the crankcase.
  • Page 12 Engine special tools 503 55 22-01 544 10 36-02 Sealing plug Bearing press Replaces the decompres- • Dismantling the main sion valve. bearing. • Leakage testing the • Assembly of the crank- crankcase. shaft. • Assembly of the clutch’s 504 91 40-01 support washer on the crank shaft.

  • Page 13: Service Data

    Service data 5. SERVICE DATA 3 - 4 3 - 4 Fully tightened 1 - 2 17 - 23 7 - 9 10 - 12 3 - 4 20 - 33 Fully tightened 3 - 4 NOTE! Some of the screws are captive screws and will remain into the cover.
  • Page 14 Service data 3 - 4 Fully tightened 11 - 13 1 - 1,4 17 - 23 10 - 18 Ricin oil 15 - 17 10 - 14 8 - 9 - English...
  • Page 15 Service data 10 - 12 20 - 33 10 - 12 20 - 33 5 - 7 38 - 42 2 - 10 English -...
  • Page 16 Service data 9 - 11 3 - 4 35 - 40 9 - 11 8 - 11 7 - 9 35 - 40 8 - 11 6 - 9 5 - 6 6 - 9 6 - 9 5 - 6 Fully tightened 4 - 6 4 - 6...

  • Page 17: Components - Orientation

    Components - orientation 6. COMPONENTS – ORIENTATION 6.1. COMPONENTS A. Cutting blade B. Blade guard C. Adjustable handle for the blade guard D. Front handle E. Air filter cover F. Cylinder cover G. Filler cap H. Starter handle Starter J. Tool bracket with combination wrench K.

  • Page 18: Dismantling Into Basic Modules

    Dismantling into basic modules 7. DISMANTLING INTO BASIC MODULES 7.1. BASIC MODULES This chapter shows how the machine is built up of basic modules, for example, the starter, carburet- tor, air filter system, etc. The purpose is to illustrate how you can easily and effectively dismantle and assemble the machine in its basic modules.
  • Page 19 Dismantling into basic modules 7.2. STARTER 1. Loosen the 4 screws on the guard. 2. Dismantle the starter. DISMANTLE STARTER 7.3. CUTTING HEAD 1. Loosen the screws on the cutting head. 2. Slacken off the belt tension using the adjuster screw.
  • Page 20 Dismantling into basic modules 5. Loosen the hoses by the water valve. Lift off the belt from the pulley and remove the cutting head. DISMANTLE CUTTINGHEAD STEP 5 6. Loosen the bolt on the rear belt guard. (Tightening torque when assembling 6.6–8.1 lbf·ft/9–11 Nm.) 7.
  • Page 21 Dismantling into basic modules 7.5. AIR FILTER 1. Remove the cover’s three screws and remove the ait filter cover. REMOVE THE HOOD 2. Unscrew the filter’s centre screw. 3. Vacuum the area around the filter. Carefully lift up the paper filter so that dust does not fall into the carburettor inlet.
  • Page 22 Dismantling into basic modules 7.7. CARBURETTOR 1. Unscrew the two screws at the inlet elbow to release the carburettor. CARBURETTOR 2. Loosen the wire nipple on the opposite side. CARBURETTOR 3. Remove the fuel hose (1). Turn the carburettor (2) and remove the choke (3) . CARBURETTOR 4.
  • Page 23 Dismantling into basic modules 7.8. AIR DUCT 1. Dismantle the entire air filter unit, cylinder cover and starter. Note how the cable to the stop switch and the ignition lead are fitted in the air duct. 2. Loosen the ignition lead from the spark plug and release the cable from the air duct.
  • Page 24 Dismantling into basic modules 2. Release the inlet manifold from the cylinder by opening the hose clamp (1) with a screwdriver. 3. Remove the impulse hose (2) from the flange (4) and push down the insulation wall (3). 4. Remove the flange (4) from the inlet manifold. 5.
  • Page 25 Dismantling into basic modules DIVIDING THE MACHINE Remove the vibration dampers outer screws: • above the filler cap (1) • next to the handle frame (2) • below the flywheel (3) • above the ground support (4) • next to the cylinder (5) •...

  • Page 26: Starter

    Starter 8. STARTER 8.1. REPLACING THE STARTER CORD Dismantle the starter. 8.2. ELIMINATE THE SPRING FORCE FROM THE RETURN SPRING 1. Pull out the starter cord approximately 12 in./30 cm. Hold the starter pulley with your thumb and place the cord in the cut-out on the starter pulley.
  • Page 27 Starter 8.3. ATTACH THE NEW STARTER CORD The starter cord should be 45 in./115 cm long and have a diameter of .16 in./4 mm. 1. Insert one end of the cord from the top through the hole in the starter pulley and then out through the notch for the cord.
  • Page 28 Starter 3. Carefully lift up the plate above the spring with a screwdriver. If the spring is assumed to be broken, you should put a cloth over the plate to dampen the spring motion if it pops out of the spring housing.
  • Page 29 Starter DISMANTLING/ASSEMBLING The starter pawls are fitted using a shoulder screw. Note the position of the springs in relation to the flanges on the flywheel so that they are fitted correctly. NOTE! Do not forget the washer (A) that should lie under the starter pawls against the flywheel.

  • Page 30: Ignition System

    The design is such that the ignition point does not Volts Ignition point need to readjustment. Husqvarna K1270 has integrated overspeed protection in the electronic unit that limits the engine’s speed to 9,300 rpm. The ignition system consists of the primary coil (A) Electronic...
  • Page 31 Ignition system 9.4. TROUBLESHOOTING Examine the ignition system first when the engine does not start. CHECK THE IGNITION SPARK 1. Earth the spark plug against the cylinder. 2. Move the stop button to the operating position. Pull the starter handle as with starting. 3.
  • Page 32 Ignition system 2. Insert a pair of pointed pliers in spark plug connection and pull out the spring and cable end. 3. If the connection is defective, the ignition lead can be shortened slightly. Make a new hole in the cable with a awl and fit the connection spring.
  • Page 33 Ignition system DISMANTLING THE STOP SWITCH 1. Remove the screw (1). 2. Push the switch by hand in the direction indi- cated by the arrow (2). 3. Use a screwdriver to pry the inner part of the stop switch in the opposite direction, as indicated by the arrow (3) 4.

  • Page 34: Flywheel

    NOTE! Striking tools must never be used for removing or fitting the nut! REMOVE CENTRE NUT TOOLS A special tool 502 51 49-02 from Husqvarna is required to dismantle and assemble the flywheel. The tool fits virtual all flywheels on Husqvarna power cutters.
  • Page 35 Flywheel CENTRE THE TOOL 5. Centre the tool on the crankshaft. Select the appropriate screw, supplied with the tool, and fit the screws in the holes for the start hooks. CENTRE THE TOOL MOUNT THE SCREW PRESS 6. Mount the screw press in the centre and screw it down far enough to ensure it is secure in the plate.

  • Page 36: Air Filter

    Air filter 11. AIR FILTER 11.1. FUNCTION The centrifugal cleaning is the first step in the air purification of the inlet air. The fins on the flywheel supply the cylinder with cooling air (large arrow) while they are also the active part of the centrifugal cleaning of the engine’s inlet air.

  • Page 37: Inlet System

    Inlet system 12. INLET SYSTEM 12.1. INLET MANIFOLD The inlet manifold joins the carburettor and cyl- inder. The inlet manifold insulates the carburettor from cylinder heat and also provides the carburet- tor with vibration damping. The inlet manifold has separate ducts for the fuel-air mixture and clean air.
  • Page 38 Inlet system 5. Remove the fuel hose (1). Turn the carburettor (2) and remove the choke (3). 6. Lift off the carburettor. REMOVE CARBURETTOR SmartCarb™ The channel, marked by arrows, connects the carburettor’s measurement chamber with inlet air in the inlet elbow. Pressure equalisation between these allows the carburettor to provide the right fuel/air mixture regardless of how fouled the filter may be.
  • Page 39 Inlet system 2. Release the inlet manifold from the cylinder by opening the hose clamp (1) with a screwdriver. 3. Remove the impulse hose (2) from the flange (4) and push down the insulation wall (3). 4. Remove the flange (4) from the inlet manifold. 5.

  • Page 40: Fuel System

    Fuel system 13. FUEL SYSTEM FUEL FILTER Dismantle the filler cap and pull out the section holding the filler cap in position when fuelling. Catch the fuel hose with the help of tool 502 50 83-01. DISMANTLE THE FUEL FILTER Pull out the fuel filter.
  • Page 41 Fuel system 13.1. CHECK FUEL HOSE 1. Detach the fuel hose at the carburettor and plug the fuel hose. 2. Repeat the pressure test. If pressure can build up the hose is intact and the carburettor must be checked. FUEL SYSTEM HOSES To work with the fuel system’s hoses, the machine must be divided at the antivibration elements, see: chapter 7.12 Anti-vibration on page 24.
  • Page 42 Fuel system 13.3. TANK VALVE – FUNCTION TEST The easiest way of testing the tank valve is by the “mouth method”. For reasons of hygiene, attach a suitable hose to the white part of the valve. Test the tank valve by first sucking in the direction towards the tank –...

  • Page 43: Carburettor

    Carburettor 14. CARBURETTOR COMPONENTS A. Throttle valve B. Throttle lever for accelerator C. Throttle lever for choke D. Lever for start throttle E. Connection to Air Purge A. Thr F. Fuel line from tank B. Thr G. Impulse channel, from crankcase to carburettor C.
  • Page 44 Carburettor 14.1. CARBURETTOR VERSIONS The carburettor technology is being continuously developed and refined. The carburettor version can be read from the marking as shown in the illustration, for example, W69 950. The components that are subject to service are usually identical from version to version, such as needle valve, pump diaphragm, measurement chamber diaphragm etc.
  • Page 45 Carburettor a leaking needle valve, or a leaking carburettor. Check that the screws on the pump and measure- ment chamber covers are tightened. Testing can also be performed with the carburettor assembled on the machine. Drain the fuel from the carburettor by pressurising this repeatedly before the measurement values are read.
  • Page 46 Carburettor MEASUREMENT CHAMBER DIAPHRAGM – INSPECTION Make a visual inspection of the diaphragm with regard to cracks and leakage. Fuel on the top, towards the cover, indicate leakage. Change the diaphragm. NEEDLE VALVE A faulty needle valve is the most common cause of malfunction caused by the carburettor.
  • Page 47 Carburettor PUMP UNIT – FUNCTION The pump diaphragm (A) is driven by the pressure variations in the crankcase, which are led to the top of the pump diaphragm. The fuel on the underside of the diaphragm is pumped to the valves (B). The counter pressure of the measurement chamber diaphragm against the needle valve in the measurement chamber controls the valves’...
  • Page 48 Carburettor CHANNELS BLOWING CLEAN THE CARBURETTOR In connection with a service on the carburettor it is appropriate to blow out any particles from the channels using compressed air. The measurement chamber diaphragm and the pump diaphragm as well as the needle valve must be dismantled before starting to blow clean.
  • Page 49 Carburettor TACHOMETER 502 71 14-01 The instrument is induction sensing and does not need to be connected directly to the ignition lead. The air filter cover can be fitted when testing. The supplied antenna cable does not normally need to be used. TACHOMETER Adjusting outdoors Naturally the idle speed must be adjusted outdoors...

  • Page 50: Decompression Valve

    Decompression valve 15. DECOMPRESSION VALVE 15.1. FUNCTION The decompression valve reduces the compres- sion in the cylinder when starting. DECOMPRESSION VALVE POSITION A limited quantity of fuel/air mixture leaks out through the decompression valve, as shown in fig. (A). As soon as the engine fires the valve will close due to the combustion pressure, as in fig.

  • Page 51: Cylinder/Piston

    Cylinder/Piston 16. CYLINDER/PISTON 16.1. COMPRESSION TEST The compression test indicates leakage from the combustion chamber. If the machine lacks engine power and is difficult to start this may be due to poor compression. Close the decompression valve or fit the sealing plug 503 55 22-01 to eliminate the decompression valve as the source of the fault.
  • Page 52 Cylinder/Piston 4. Remove the cylinder base gasket. TOOLS The following steps requires the use of tool kit 502 50 70-01, containg piston ring compressors, to press together the piston rings when assembling. The support plate is placed between the piston and the crankcase to facilitate the work.
  • Page 53 Cylinder/Piston GUDGEON PIN PUNCH 505 38 17-05 The gudgeon pin punch is used to press out the gudgeon pin. It is also used for assembly. DISMANTLE THE GUDGEON PIN Push out the gudgeon pin in any direction. Can usually be done by hand. If it is tight, it can be knocked out with a small hammer and gentle force.
  • Page 54 Cylinder/Piston 16.4. WEAR TOLERANCES CYLINDER Inspect the cylinder bore against the light. As long as the surface layer has not been broken through, the cylinder is in working order. Aluminium from the piston can be removed using emery cloth, particle size approximately 120 grit. Carefully clean after sanding.
  • Page 55 The cause of engine failure is often difficult to establish, primarily when the machine’s history is not known. The typical cases below can provide some guidance. (Pistons from Husqvarna K1260.) NORMAL WEAR Typical normal wear is easiest to see on the piston sections that face the exhaust and inlet sides.
  • Page 56 Cylinder/Piston SCORING, LACK OF OIL Damage of this type is always the result of over- heating. The cores are usually on the exhaust side, which is the hottest. Inlet side can show similar damage. Check whether the machine has broken down due to an incorrect oil mixture, or no oil at all.
  • Page 57 Cylinder/Piston CYLINDER FOOT GASKET NOTE! It is very important that the cylinder foot fits tightly to the crankcase. 1. Carefully clean any old gasket residue from the surfaces that are in contact with the gasket. 2. Note the gasket’s assembly to the cylinder. Turn the gasket ensuring the impulse channel remains open to the crankcase.

  • Page 58: Crankcase

    Crankcase 17. CRANKCASE 17.1. LEAKAGE TEST A leaking crankcase results in reduced crankcase compression. A typical sign is that the machine is difficult to start. TOOLS Tools 502 71 39-01 and 506 34 45-01 are required during the leakage test to seal the exhaust port and inlet port.
  • Page 59 Crankcase 17.3. CRANKCASE SEAL TOOLS In order to change the crankcase sealing rings, you will need puller 502 50 55-01, assembly wedge 502 50 52-01 and assembly punch 502 50 82-01. DISMANTLING 1. Press down the puller and tighten the puller’s conical thread in the sealing ring.
  • Page 60 Crankcase 17.4. SEPARATING THE CRANKCASE TOOLS A universal puller (504 90 90-02) and a special tool (grip plate) from Husqvarna (544 06 00-02) are needed to spilt the crankcase. STARTING POSITION Dismantle the basic modules from the crankcase. Note that the crankshaft’s stuffing boxes are to be dismantled.
  • Page 61 Crankcase Clutch side 4. Heat the bearing seat on the clutch side to about 200 °F/100 °C. DIVIDING THE CRANKCASE STEP 3 5. Support the crankcase with wooden blocks as close to the crankshaft as possible. Knock out the crankshaft from the crankcase using a plastic hammer.
  • Page 62 Crankcase IF THE BEARING DOES NOT RELEASE FROM THE CRANKCASE Normally the bearing should release from the crankshaft during dismantling. The bearing is dismantled from the crankshaft using the puller 531 00 48-67. 1. First fit the puller plate behind the bearing. 2.
  • Page 63 Crankcase Place the sleeve in the tool kit against the bearing and knock this out with a large plastic mallet. PLACE SLEEVE ASSEMBLY 3. Use the tool kit 506 37 61-02 for bearing assembly in both crankcase halves. 4. Place the bearing on the support plate and hold it under the crankcase half.
  • Page 64 Crankcase 17.6. CRANKSHAFT TOOLS Use the tool kit 544 10 36-02 to press the crank- shaft into the bearing, after first fitting this in the relevant crankcase half. The threaded mandrel for the clutch and flywheel side is M12V and M10x1, respectively. ASSEMBLY 1.
  • Page 65 Crankcase Assemble the other crankcase half using the same method as the first. Use the fitting, M10x1. Support the crankcase half in position with a long screw at the rear attachment point. Fit the crankcase bolts as soon as possible to ensure that the gasket is properly fitted and that the crankcase halves meet in the correct position.

  • Page 66: Clutch

    Clutch 18. CLUTCH 18.1. DISMANTLING 1. Dismantle the cutting head, the rear belt guard, the air filter cover, and the filter base. FIT THE PISTON STOP 2. Lock the crankshaft’s travel by fitting the piston stop 504 91 06-05 instead of the spark plug. CLUTCH - FIT THE PISTON STOP UNSCREW THE CLUTCH –...
  • Page 67 Clutch 18.3. ASSEMBLY PISTON STOP Lock the crankshaft’s travel using the piston stop 504 91 06-05 instead of the spark plug. Tightening torque 26–30 lbf·ft/35–40 Nm. NOTE! For reasons of safety it is important that the clutch is assembled with the right tightening torque.
  • Page 68 Clutch ASSEMBLY 4. Pre-fit the springs in the part of the shoes that have the narrow space. 5. Turn the springs with the hook to the side marked “Off”. 6. Turn the clutch and turn the springs in place using an awl. CLUTCH ASSEMBLY CLUTCH ASSEMBLY BEARING REPLACEMENT –...
  • Page 69 Clutch DISMANTLING 1. Fit the screw with the large washer on the bearing. 2. Fit the socket and cover in position. 3. Fit a washer and nut. CLUTCH - DISMANTLE THE BEARINGS STEP 1 4. It is a good idea to secure the Allen key in a vice.

  • Page 70: Cutting Head

    Cutting head 19. CUTTING HEAD 19.1. DISMANTLING THE BLADE GUARD/BEARING HOUSING This chapter describes dismantling of the cutting head components and and provides instructions for replacing the blade shaft bearing. Start by dismantling the blade guard inkluding the cutting according to chapter 7.3. 1.
  • Page 71 Cutting head 6. Remove the center screw and lift the belt pulley. off. DISMANTLING THE CUTTING HEAD STEP 6 Four mounting screws holding the bearing house are now accessible. Unscrew the four screws using a screwdriver. DISMANTLING THE CUTTING HEAD STEP 7 The bearing house and the remaining components can now be dismantled in the order shown in the illustration.
  • Page 72 Cutting head 19.2. BEARING REPLACEMENT BLADE SHAFT HOUSING The bearing housing carries dual ball bearings for the blade’s drive shaft. The belt pulley with retarder is located on the opposite side. The bearing and axle has been designed to provide a distinct position for the shaft in the axial direction and to prevent the risk of incorrect fitting.
  • Page 73 Cutting head REMOVE THE BEARINGS FROM THE AXLE 4. Remove the bearings using a universal puller. BEARINGS REPLACEMENT - REMOVE BEARING ALTERNATIVE 1: FITTING WITH PRESS 5. Support the bearing housing under the area for the bearing with, for example, a piece of wood so that the bearing housing is horizontal.
  • Page 74 Cutting head FIT BEARING ON THE AXLE 6. Place the bearing on the axle and place the axle in pressing device (C). This bearing provides support to the inner ring, which is important here. 7. Use a plastic hammer to push or knock the axle down until the spacer meets the bearing’s inner ring.

  • Page 75: Wet System

    Wet system 20. WET SYSTEM 20.1. DESIGN A spray nozzle is located on each side of the blade guard. The water strikes a section of the cutting blade and the centrifugal force carries it out towards the blade’s diamond segment. The spray nozzles are available with several different hole diameters depending on the type of machine and application.

  • Page 76: Handle

    Handle 21. HANDLE 21.1. REAR HANDLE – CONTROLS The handle unit is permanently attached to the fuel tank. This chapter deals with maintenance work on the rear handle control. Maintenance work related to the fuel tank is described in the “Fuel system” chapter.
  • Page 77 Handle 21.5. THROTTLE LOCK 1. Press in the throttle in the handle top. Press the throttle forwards with a screwdriver and lift up the rear edge. HANDLE - THROTTLE LOCK 2. Pull out the throttle from the handle. 3. Remove the throttle lock. HANDLE - THROTTLE LOCK NOTE! Important! If the white lever for the throttle wire is not included, as shown below, it...
  • Page 78 Handle 21.6. THROTTLE 1. Pull up the throttle until it stops. 2. Raise the white lever for the throttle wire and place it in the position shown. HANDLE - REMOVE THE THROTTLE STEP 1 AND 2 3. Press the unit at a slight angle to the side, as shown, and at the same time work out the handle.
  • Page 79 Handle 21.8. FIT THE THROTTLE LOCK 1. Position the spring loop in the intended slot in the throttle, as shown in the divided handle view to the right. HANDLE - FIT THE THROTTLE LOCK DIVIDED HANDLE VIEW- THE SPRING LOOP POSITION 2.
  • Page 80 Handle - English...

  • Page 81: Troubleshooting

    Troubleshooting 22. TROUBLESHOOTING 22.1. ENGINE DOES NOT START Remove the spark plug from the cylinder, and holding the cylinder, pull the recoil starter and check whether any sparks appear between the spark plug electrodes. Symptom/Category Cause Action There are no sparks at the spark plug 1.
  • Page 82 Troubleshooting 22.2. ENGINE STOPS WORKING DURING OPERATION Symptom/Category Cause Action There are no sparks at the spark plug 1. The switch has accidentally been set to off Set the switch to the left position 2. The plug cap has come off Fit it completely back on 3.
  • Page 83 Troubleshooting 22.4. INSUFFICIENT OUTPUT OR UNSTABLE ROTATION Symptom/Category Cause Action 1. Air has entered through the fuel pipe joint, Insert it securely etc. 2. Air has entered the fuel pipe due to a Replace crack or pin hole 3. Air has entered through the insulator pulse Insert it securely pipe insertion part, etc.
  • Page 84 2016W06...

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