Operator’s Manual. The assembly of other equipment or ac- The engine’s exhaust fumes are poisonous. Test run the engine cessories or spare parts not approved by Husqvarna can result outdoors. in the failure to meet these safety demands and that the person carrying out assembly bears responsibility for this.
Starter Starter Contents Dismantling, model 326 ______________________________ 4 Assembly, model 326 _______________________________ 4 Dismantling, model 327 LS ___________________________ 6 Assembly, model 327 LS _____________________________ 6 Dismantling, model 327 P5 ___________________________ 7 Assembly, model 327 P5 _____________________________ 8 Replacing the drive dogs ____________________________ 10...
Starter Dismantling Model H326 Remove the 3 screws and lift off the starter. NOTE! Ensure the bushings (A) that guide the starter towards the fuel tank are not lost. 502 50 18-01 Offl oad the spring tension. Offl oad the spring tension. Remove the screw from the centre of the Lift up the starter cord on the starter pulley starter pulley and lift off the starter pulley.
Starter Assemble the starter handle. Assemble the starter handle. Tie a double knot and fold under the free end. Pull the knot fully into the handle. Tension the return spring. Tension the return spring. Check the spring tension. Pull the starter cord out completely and slow the starter pulley with your thumb.
Starter Dismantling Dismantling Model H327LS Model H327LS Remove the starter from the engine body. Remove the 3 screws and lift off the starter. 502 50 18-01 Offl oad the spring tension. Offl oad the spring tension. Remove the screw from the centre of the Lift up the starter cord on the starter pulley starter pulley and lift off the starter pulley.
Starter Assemble the starter handle. Assemble the starter handle. Tie a double knot on the cord and fold under the free end. Pull the knot fully into the handle. Tension the return spring. Tension the return spring. Pull the starter cord out completely and slow Check the spring tension.
Starter Offl oad the spring tension. Offl oad the spring tension. Remove the screw and the washer. Lift up the starter cord on the starter pulley and allow it to rotate clockwise. Slow the Carefully remove the drive disc for the pres- rotation with your thumb.
Starter Attach the new starter cord to the starter Mount the starter cord in the starter pulley and pulley and wind it 4 turns anticlockwise make sure the knot in the cord fi ts entirely around the starter pulley. in the compartment. Slide the starter pulley over the bearing pin.
Starter Replacing the drive dogs Replacing the drive dogs Dismantle the drive body. Fit the piston stop, no. 502 54 15-01 in the spark plug hole and loosen the drive disc cup. (The nut is soldered onto the disc drive.) 502 54 15-01 Remove the circlip and replace any damaged Remove the circlip holdings the drive dog.
Electrical system Electrical system Contents Checking the ignition spark, model 326 ________________ 12 Dismantling, model 326 ____________________________ 15 Assembly, model 326 ______________________________ 16 Checking the ignition spark, model 327 LS, 327 P5 _______ 17 Dismantling, model 327 LS, 327 P5 ___________________ 19 Assembly, model 327 LS, 327 P5 ______________________ 20...
Electrical system The engine is equipped with an electronic ignition system completely without moving parts. Consequently, a faulty component cannot be repaired, but must be replaced by a new component. The spark in an electronic ignition system has a very short burn time and can therefore be interpreted as weak and can be diffi cult to see while troubleshooting.
Electrical system If no spark occurs, disconnect the stop If no spark occurs even now, remove the switch. short-circuit cable from the connection point in the carburettor compartment. Replace the switch if necessary. If the plug now sparks, the fault is either in the stop switch or the short-circuit cable.
Electrical system Attach the ignition coil to the ignition Attach the ignition coil to the ignition cable cable. and ensure that the wire is folded along the cable. Slide the contact coil into the spark plug cover. TIP! Lubricate the hole in the spark plug cover so that it is easier to slide in the contact coil.
Electrical system Dismantling Dismantling Model 326 Model 326 Dismantle the starter, cylinder cover, The following components must be guard over the muffl er and spark plug. dismantled for the ignition system to be accessible. Unhook the throttle cable from the carbu- rettor.
Electrical system Fit the piston stop no. 502 54 15-01 and Fit piston stop no. 502 54 15-01 in the remove the nut holding the fl ywheel. spark plug hole. Remove the nut holding the fl ywheel. 502 54 15-01 NOTE! Position the piston stop so it is clamped between the piston crown and the combustion chamber.
Electrical system Checking the ignition Checking the ignition spark spark Model 327 LS, 327 P5 Model 327 LS, 327 P5 Check and rectify the spark plug in the Check and rectify the spark plug in the same way as described for model 326. same way as described for model 326.
Electrical system Fit the ignition coil onto the ignition cable Fit the ignition coil onto the ignition cable and make sure both ends of the wire are and push it into the spark plug guard. inserted into the centre of the cable for best contact.
Electrical system Dismantling 327 LS 327 P5 Model 327 LS, 327 P5 The following components must be dismantled for the ignition system to be accessible. Cylinder cover, guard over the muffl er and spark plug. Unhook the throttle cable from the carbu- rettor.
Electrical system Fit the piston stop no. 502 54 15-01 and Fit piston stop no. 502 54 15-01 in the remove the nut holding the fl ywheel. spark plug hole. Remove the nut holding the fl ywheel. NOTE! Position the piston stop so it is clamped between the piston crown and the combustion chamber.
Fuel system Fuel system Contents Air fi lter __________________________________________ 22 Tank venting _____________________________________ 23 Fuel fi lter ________________________________________ 23 Fuel pump _______________________________________ 24 Carburettor ______________________________________ 24 Carburettor settings _______________________________ 31 Throttle, model 326 ________________________________ 33 Throttle, model 327 ________________________________ 34 Trouble shooting guide _____________________________ 36...
Fuel system ank venting Tank venting Check that the tank venting valve works Tank venting takes place through the fuel correctly. cap and needs to be functional for the engine to work. Replace the fuel cap if the valve is faulty. •...
Fuel system If the fi lter is not too dirty, its surface can be cleaned with a brush. Model 326 Otherwise it must be replaced. Check the fuel hose for cracks and leaks. Make sure that the fi lter’s connection neck is inserted as far as possible into the fuel hose and that the O-ring is suffi ciently tight so that the fi lter cannot slide off the...
Fuel system The carburettor’s design The carburettor’s design The carburettor can be divided into three The carburettor can be divided into three diff erent functional units: the metering unit, diff erent functional units: the metering the blending unit, and the pump unit. unit, the blending unit, and the pump unit.
Fuel system Dismantling the carburettor Dismantling the carburettor Carefully remove the control diaphragm Remove the control diaphragm and check for damage. (A) and gasket (B). Check the diaphragm for holes and wear Replace if required. on the pin (C). Replace the diaphragm if required. Pressure test the metering unit.
Fuel system Check the needle valve for damage on the Check the needle valve and the lever arm tip and in the lever arm groove. for damage or wear. Replace damaged components with new Check the lever arm for damage to the groove for the needle valve and wear on ones.
Fuel system Pull away the movement limiters on the jet screw needles using a long nosed pliers or the special tool 504 62 29-01 if the mo- vement limiter is made of plastic and 540 06 82-01 if it is made of zinc. Unscrew the jet needles.
Fuel system Assembling the carburettor Assembling the carburettor • Blow all channels in the carburettor Blow the carburettor housing clean. compartment clean Fit a new plug. • Mount a new plug. Fit a new main jet. Use a suitable punch to get a comple- tely tight seal.
Fuel system Attach the various parts of the measuring Attach the various parts of the measuring unit in the reverse order as set out for unit in the reverse order as set out for dismantling. dismantling. The lever arm should lie fl ush with the The lever arm should lie fl ush with the carburettor housing.
Fuel system 5. Connect the throttle cable on the car- Connect the throttle cable and check that burettor with the help of fl at nose pli- it sits correctly in the guide on the air fi lter ers. Check that the cable sits correctly connection (A) and in the cut-out (B) by in the guide on the air fi lter connection the heat guard.
Fuel system Basic setting With blade or similar item The carburettor is set to its basic setting when test run at the H-needle factory. The basic setting is “richer” than the optimal setting Step 1: Twist the needle to the position that provides an engine (fast idle speed is 600–800 rpm under the recommended max.
Fuel system Throttle, model 326 Throttle, model 326 Separate the engine body and the clutch We recommend that the throttle is dis- cover. mantled from the engine and shaft in order to effi ciently carry out service and repair work. Separate the engine body and the clutch cover (see the “Electrical System”...
Fuel system Assembly of the throttle is done in the reverse order as set out for dismantling. Position the parts in the left-hand throttle half. Ensure the return spring (A) is facing the right way. Check that the throttle cable and the short-circuit cable are pressed correctly down in their channels so that they are not pinched when the two throttle halves are...
Fuel system Remove the 5 screws holding the handle in place. Carefully remove the right handle half and make sure that the vibration damper (E) is not lost (one on each side of the clamping sleeve). Note how the diff erent parts are fi tted. Remove the clamping sleeve (F).
Fuel system Trouble Shooting Guide Symptom Starting Low speed Acceleration/ Deceleration Probable causes Stop screw for the throttle not working Fuel tank/hose Fuel fi lter blocked The fuel hose blocked Air in fuel ducts Incorrect/poor fuel Pump diaphragm Vacuum pulse leakage Vacuum pulse duct blocked Loose screw(s) on the pump cover Faulty pump diaphragm...
Centrifugal clutch Centrifugal clutch Contents Dismantling ______________________________________ 38 Assembly ________________________________________ 38 Replacing the clutch drum and drive axle, model 326 ____ 39 Replacing the clutch drum, model 327 LS, 327 P5 ________ 40 Replacing the vibration damper, model 327 ____________ 40...
Centrifugal clutch The centrifugal clutch has the task of transferring the power from the engine to the cutting equipment’s drive axle. As the name implies, it works according to a centrifugal principle. This means the clutch’s friction shoes are thrown outwards towards the clutch drum at a certain engine speed.
Centrifugal clutch Replacing the clutch Replacing the clutch drum and drive axle drum and drive axle Model 326 Model 326 Separate the shaft from the clutch cover. Separate the shaft from the clutch cover. Dismantle the clutch drum using tool 502 Pull away the clutch cover complete with 52 16-01.
Centrifugal clutch Replacing the clutch Replacing the clutch drum drum Models 327 LS, 327 P5 Models 327 LS, 327 P5 Remove all parts including the vibration Remove all parts including the vibration damper (see below) until only the clutch damper (see below) until only the clutch cover is left.
Bevel gear/Cutting attachment The angle gear has two purposes: The fi rst is to gear down the engine’s high speed to better suit the lower speed a saw blade or trimmer re- quires to work effi ciently. Secondly, the angle gear contributes towards the operator’s working stance so that it is comfortable and at the same time effi cient.
Bevel gear/Cutting attachment Dismantle the bearings from the output Dismantle the bearings from the output and input axles. and input axles with the help of a small bearing puller. TIP! Hold the bearing puller in a vice so that it gains a better grip around the bearing.
Bevel gear/Cutting attachment Branch saw Branch saw Dismantling, drive end Dismantling, drive end Dismantle the chain and bar. Dismantle the chain, bar and the chain Remove the nut holding the chain sprock- sprocket. et and the cover plate (B) in place. Brake the rotation by inserting a suitable mandrel (A) through the drive disc and into the gear housing.
Bevel gear/Cutting attachment The pin screw (C) must fi rst be removed The pin screw (C) must fi rst be removed to replace the wear guard plate (A) or the to replace the wear guard plate (A) or the chain adjuster screw (B). chain adjuster screw (B).
Bevel gear/Cutting attachment Check when assembling that the rubber unit (A) that acts as the oil channel has not fallen off the chain cover. Dismantling, oil pump end Dismantling, oil pump end Dismantle the chain, bar and chain sp- Dismantle the chain, bar and chain sp- rocket.
Bevel gear/Cutting attachment Dismantling, input shaft Dismantling, input shaft Remove the saw body from the shaft. Remove the saw body from the shaft by loosening the clamping screw (C) and Remove the circlip holding the ball bearing remove the centering screw (D) that fi ts in on the input shaft.
Bevel gear/Cutting attachment Dismantle the bearings from the output shaft (pump shaft) with the help of a small bearing puller. Assembling, oil pump end Assembling, oil pump end Assemble in the following order: Assemble the diff erent components in the reverse order as set out for dismantling.
Cylinder and piston Cylinder and piston Contents Dismantling ______________________________________ 50 Cleaning, inspection _______________________________ 51 Analysis and actions ________________________________ 52 Service tips _______________________________________ 56 Wear tolerances ___________________________________ 57 Assembly ________________________________________ 57...
Cylinder and piston The cylinder and the piston are two of the components exposed to most strain in the engine. They must withstand, for example, high speeds, large temperature swings and high pressure. Moreover, they must be resistant to wear. Despite these tough working conditions, major piston and cylinder failure is relatively uncommon.
Cylinder and piston Remove the gudgeon pin circlips. Remove the gudgeon pin circlips. Use small fl at nose pliers and remove the gudgeon pin circlips. TIP! Keep your thumb over the circlip to pre- vent it from fl ying out. Dismantle the piston.
Blocked spark arrestor mesh in the Clean or replace the spark arrestor mesh. muffl er. For the best results we recommend Husqvarna two-stroke oil or ready-mixed fuel that is specially developed for air-cooled two-stroke engines. Mixing ratio: 1:50 (2%). If Husqvarna two-stroke oil is not available another good quality two-stroke oil can be used.
Cylinder and piston Piston scoring caused by heavy carbon deposits Too heavy carbon depositing can cause damage similar to that caused by insuffi cient lubrication. However, the piston skirt has a darker colour caused by the hot combustion gases that are blown past the piston. This type of piston damage starts at the exhaust port where carbon deposits can be- come loose and get trapped between the piston and the cylinder wall.
Cylinder and piston The guide pin for the piston ring has been pushed up Deep, irregular grooves caused by a loose circlip. Irregular grooves on the piston’s inlet side caused by through the top of piston. Shown here on the piston’s inlet side. a broken roller retainer.
Cylinder and piston Cause: Action: • Faulty air fi lter. Small dust particles Fit a fi ner grade fi lter. pass through the fi lter. • The fi lter is worn out due to too much Check the fi lter carefully for holes and cleaning, whereby small holes have damage after cleaning.
Cylinder and piston Larger, harder particles that enter the engine cause serious damage to the underside of the piston skirt. Cause: Action: • Air fi lter damaged or missing. Fit a new air fi lter. • Parts from the carburettor or intake Regular service and inspection.
Cylinder and piston Wear tolerances Cylinder bore Piston ring gap Piston ring groove Piston ring play Max. 1,6 mm. Clean the Max. 0.15 mm. Clean the When the surface coating is Max. 1.0 mm with the piston groove before checking the groove before checking the worn and aluminium ap- ring inserted in the lower...
Crankshaft and crankcase The task of the crankshaft is to transform the reciprocating motion of the piston to rotation. This requires a stable design withstanding immense pressure and rotational and bending strain, as well as high rotational speed. In addition the connecting rod is exposed to large acceleration and retardation forces as it moves bet- ween the top and bottom dead centres.
Crankshaft and crankcase Check the crank bearing. Check the crank bearing. The connecting rod shall not have any radial play (up and down). It should, however, have axial play, in or- der to ensure good lubrication of the crank bearing among other things. Check for wear on the crankshaft’s bea- Check the crankshaft’s bearing and seal- ring.
Crankshaft and crankcase Check that the guide rail and its gaskets A rail sits in the bottom of the crankcase are undamaged. and has the task of guiding the fuel-air mixture up towards and into the cylinder. Check that the gasket (A) which lies around the rail is undamaged and the gaskets (B) that are to seal against the cylinder.
Crankshaft and crankcase Fit the pressure test nipple (B) 503 84 40-01 in Fit the pressure test nipple (B) 503 84 40-01 in the spark plug hole. the spark plug hole. Connect meter 531 03 06-23 and check Connect meter 531 03 06-23 to the nipple for leakage.