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Workshop manual
343R , 345RX
343F, 345FX, 345FXT
English
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Workshop Manual Brushcutter, Trimmer Model 343R, 345RX, 343F, 345FX, 345FXT Contents General recommendations ___________________ 2 1. Starter __________________________________ 3 2. Electrical system _________________________ 7 3. Fuel system _____________________________ 15 4. Centrifugal clutch ________________________ 31 5. Angle gear ______________________________ 37 6. Cylinder and piston ______________________ 41 7. Crankshaft and crankcase _________________ 51 © Copyright Husqvarna AB, S
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General recommendations Remember: Special tools Never start the engine without the clutch and clutch drum ! Certain tasks in this handbook require the use of special mounted. tools. In sections where this is applicable, an image of the Do not grasp hot elements such as the muffler or the clutch tool with an ordering number is provided. ! before they have cooled sufficiently to avoid burn injuries. We recommend using special tools in order to avoid personal injury and to eliminate expensive damag
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1 Starter 1. Contents Dismantling _________________________________ 4 Assembly __________________________________ 5 Replacing the drive dogs ______________________ 6 3
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Starter 1 WARNING! Protective glasses should be worn when working on the starter to avoid injury to the eyes if, for ! some reason, the return spring should fly out. Dismantling Dismantling Remove the starter from the engine. Remove the 4 bolts and lift off the starter. The cylinder cover does not need to be loosened or detached. 502 50 18-01 Loosen the spring tension. Loosen the spring tension. Pull out the starter cord about 30 cm. Brake the starter pulley with your thumb and lift the cord as
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Starter 1 Remove the spring cassette. Remove the two bolts holding the spring cassette and remove the cassette for replacement if necessary. WARNING! Wear protective glasses. The return spring can fly out ! and cause personal injury if improperly handled. Assembly Assembly Clean requisite parts and assemble in Clean all components before assembly: the reverse order as set out for disman- Change return springs, starter pulley tling. and starter cord as needed. NOTE! Be careful when opening the pa
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Starter 1 Tighten the return spring. Tighten the return spring. Check the spring tension. Lift up the starter cord when the return spring is completely loose and the cord pulled out completely. Then turn the starter pulley anti- clockwise 7 revolutions. Check the spring tension. With the cord completely pulled out the cord pulley should be able to be turned at least another half revolution. Mount the starter onto the engine. Mount the starter onto the engine. Pull out the starter cord a little.
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2 Electrical system 2. Contents Checking the ignition spark ____________________ 8 Replacing the spark plug cover ________________ 10 Dismantling ________________________________ 11 Drive dogs _________________________________ 12 Assembly _________________________________ 12 Heated handles_____________________________ 12 7
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Electrical system 2 The engine is equipped with an electronic ignition system completely without moving parts. Conse- quently, 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 difficult to see while troubleshooting. Checking the ignition Checking the ignition spark spark Clean the electrodes and check the Remove the spark plug and clean it elect
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Electrical system 2 If no spark occurs, disconnect the stop If no spark occurs even now, remove switch. the short-circuit cable from the connec- tion point in the carburettor compart- Replace the switch if necessary ment. If the plug now sparks, the fault is either in the stop switch or the short-circuit cable. Change the switch as needed and check to see if the cable insulation is damaged. The stop switch can be easily detached The stop switch is easily reached when with a screwdriver. the cove
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2 Electrical system Still no spark? Still no spark? Check the air gap. Check the air gap between the flywheel magnet and the ignition module. The gap should be 0.3 mm. Use a 502 51 34-02 feeler gauge. 0.3 502 51 34-02 Adjust the air gap. Adjust the air gap as needed to the correct value. • Loosen the bolts. • Position the feeler gauge and press the ignition module against the flywheel. • Tighten the bolts and check the air gap again. If the spark plug still does not fire, the ignition system sho
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Electrical system 2 Dismantling Dismantling Remove the starter, cylinder cover, and Remove the starter, cylinder cover, and spark plug. spark plug. Attach piston stop no. 502 54 15-01. Fit piston stop no. 502 54 15-01 in the spark plug hole. NOTE! Place the piston stop so it is caught between the piston and the cylinder head. Not so it sticks out into the exhaust port. 502 54 15-01 Remove the nut holding the flywheel. Remove the nut holding the flywheel. Remove the flywheel. Remove the flywheel
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2 Electrical system Drive dogs Drive dogs Remove the bolts. The drive dogs can be easily replaced if they are damaged. Remove the hooks and the springs to replace them. Remove the bolts, the hooks and the springs. Mind the washer (A) so as not to lose it. Mind the washer (A) so as not to lose it. Replace damaged parts. Replace damaged parts. Assemble in the reverse order. Assemble in the reverse order. Check that the hooks can be turned freely when the bolts are tight. 502 50 18-01 Assembly Asse
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Electrical system 2 Separate the contacts (A-A) and (B-B). Separate the contacts (A-A) and (B-B). Then extend the cables (A) and (B) with Then extend the cables (A) and (B) with approx. 90 cm long steel wires attached approx. 90 cm long steel wires attached to the contacts. to the contacts. This is to make it easier to draw the cables to the new heating element back through the handle. 1 = black 2 = blue Remove the bolt and pull off the left Remove the bolt that holds the left grip on the handle
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2 Electrical system 14
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3 Fuel system 3. Contents Air filter ___________________________________ 16 Tank venting _______________________________ 17 Fuel filter __________________________________ 17 Fuel pump _________________________________ 18 Carburettor ________________________________ 18 Assembly _________________________________ 24 Carburettor settings _________________________ 25 Throttle ___________________________________ 27 15
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Fuel system 3 The carburettor can come from several different In addition to the fuel tank and carburettor, the fuel system manufacturers on our models, but the function and consists of the air filter, fuel filter and tank venting. repair methods are essentially the same. All these components interact so that the engine receives the optimal mixture of fuel and air to make it as efficient as possible. Very small deviations in the carburettor setting or a blocked air filter have a large effect on
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Fuel system 3 Impregnate the filter with air filter oil. Impregnate the filter with air filter oil. Tip! Place the filter in a plastic bag and pour about a tablespoon of air filter oil no. 531 00 60-76 into the bag. Massage the oil into the air filter. 531 00 60-76 Tank venting Tank venting Check that the tank venting valve works Tank venting takes place through the correctly. fuel cap and needs to be functional for the engine to work. Replace the fuel cap if the valve is faulty. • Remove the fu
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Fuel system 3 Clean the filter externally if it is not too If the filter is not too dirty, its surface dirty. can be cleaned with a brush. Replace the filter if required. Otherwise it must be replaced. Check the fuel hose for cracks and leaks. Make sure that the filter’s connection neck is inserted as far as possible into the fuel hose and that the O-ring is sufficiently tight so that the filter cannot slide off the tube. Fuel pump Fuel pump The fuel pump facilitates cold starts. The fuel pump h
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Fuel system 3 Remove the throttle cable and fuel hose Remove the throttle cable from the from the carburettor. carburettor’s lever arm using flat nose pliers. Remove the carburettor. Pull off the fuel hose and remove the carburettor. Tip! Open the fuel cap to avoid fuel spillage caused by any excess pressure. Attach the fuel hose to the return nipple. The carburettor is made by Zama. The carburettor is made by Zama. Design, function and servicing corre- It has the same design and function as spo
