Husqvarna 334T / 338XPT / 336 / 339XP Chainsaw Service Repair Manual

334T 338XPT 336 339XP English For Husqvarna Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

2 – English CONTENTS Introduction .................................................... 3 Safety instructions ......................................... 4 Symbol explanation ....................................... 5 Technical Data ................................................ 6 Tools ................................................................ 8 Trouble shooting .......................................... 10 Service data 334T/338XPT ........................... 12 Service data 336/339XP ............................... 14 Safety equipment ......................................... 16 Starter ............................................................ 23 Ignition system ............................................. 25 Centrifugal clutch ......................................... 27 Carburettor ................................................... 29 Tank unit ....................................................... 41 AV-System ..................................................... 46 Crankshaft, Piston and Cylinder ................. 47 Bar bolt .......................................................... 51 Oil pump ........................................................ 52 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

English – 3 INTRODUCTION Layout This Workshop Manual can be used in two different ways: • For the repair of a particular system on the chain saw. • For dismantling and assembly of the entire chain saw. General This Workshop Manual provides a comprehensive description of how to trouble shoot, repair and test the chain saw. A description of different safety measures that should be taken during repair work is also given. Dismantling and assembly of the entire chain saw Proceed as follows when the entire chain saw is to be disman- tled and assembled: 1. Look up the chapter "Starter" which deals with the Starter and carry out the instructions set out under Dismantling. 2. Work forward in the Manual and carry out Dismantling in the order set out in the sections. 3. Go back to the chapter "Starter" and carry out the instructions under Cleaning and Inspection. 4. Work forward in the Manual and carry out Cleaning and Inspection in the order set out in the sections. 5. Order or take out all requisite spare parts from the stores. 6. Look up the chapter "Oil pump" which deals with the Oil pump and carry out the instructions set out under Assem- bly. 7. Work back towards the beginning of the Manual and carry out Assembly in the order set out in the sections. Some sections include a Description of the actual unit in order to increase the basic understanding. Safety NOTE! The section dealing with safety must be read and understood by all those carrying out repair work or service on the chain saw. Warning symbols can be found in this Workshop Manual and on the chain saw. See the chapter "Symbol explanation". A new decal must be applied as soon as possible if a warning symbol on the chain saw has been damaged or is missing so that the greatest possible safety can be obtained when using the chain saw. Repair of a particular system When a particular system on the chain saw is to be repaired, proceed as follows: 1. Look up the page for the system in question. 2. Carry out the sections: • Dismantling • Cleaning and Inspection • Assembly Target group When producing this Workshop Manual the assumption has been made that personnel who use it have general knowledge in the repair and service of small engines. The Workshop Manual must be read and understood by personnel who will carry out repair work and service on the chain saw. The Manual is also suitable for use when training new employees. Modifications Modifications will be successively introduced on the chain saw during production. When these modifications affect the service and/or spare parts, separate service information will be sent out on each occasion. This means that in time this Workshop manual will become out of date. In order to prevent this, the Manual should be read together with all service information concerning the chain saw in question. Tools Special tools must be used during specific steps. All service tools are listed in the Workshop Manual. Usage is evident from respective sections. Always use Husqvarna’s original: • Spare parts • Service tools • Accessories Numbering Position references to components inside the figures are designated A, B, etc. The position references restart in each new section. For Husqvarna Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

4 – English SAFETY REGULATIONS Special instructions The fuel used in the chain saw has the following hazardous properties: • The fluid and its vapour are poisonous. • Can cause skin irritation. • Is highly inflammable. The bar, chain and clutch cover (chain brake) must be fitted before the saw is started otherwise the clutch can work loose and cause personal injury. Wear ear-muffs when test running. Do not use the saw until it has been adjusted so that the chain remains still when idling. After test running, do not touch the muffler until it has cooled. Risk for burns. Insufficient chain lubrication can result in chain breakage, which can cause serious, even life-threatening injury. Ensure that the spring in the starter does not fly out and cause personal injury. If the spring tension is activated on the starter pulley when it is to be taken up, the spring can fly out and cause personal injury. Check that the brake is applied when removing the pressure spring on the chain brake. Otherwise the pressure spring can fly out and cause personal injury. Do not direct the compressed air jet towards the body when using compressed air. Air can penetrate in to the blood circula- tion, which means mortal danger. General instructions The workshop where chain saw repairs are to be done must be equipped with safety equipment as set out in local provisions. No one may repair the chain saw unless they have read and understood the content of this Workshop Manual. This Workshop Manual contains the following boxes in relevant places. Warning boxes are positioned before the procedures they refer to. WARNING! The warning box warns of the risk of personal injury if the instructions are not followed. NOTE! This box warns of material damage if the instructions are not followed. For Husqvarna Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

English – 5 SYMBOL EXPLANATION Symbols Contact with the tip of the bar can result in the bar being suddenly thrown upwards and backwards, which can result in serious injury. This saw is only intended for persons especially trained in tree conservation. See the Operator Guide! Oil refilling and adjustment of the oil flow. WARNING! Chain saws can be dangerous! Careless or incorrect usage can result in serious injury even death to operator or others. Inspection and/or maintenance should be carried out with the engine switched off, and with the stop switch in the "STOP" position. Read through the Operator Guide carefully and understand the content before using the chain saw. Operating mode Always use: • An approved safety helmet • Approved ear-muffs • Protective glasses or a visor Choke, 334T, 338XPT Choke, 336, 339XP Always use both hands whenever possible with all chain saw work. Always wear approved protective gloves. Avoid contact between the tip of the bar and objects. Regular cleaning is required. Visual inspection. Protective glasses or visor must be worn. Fuel refilling. Air purge For Husqvarna Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

6 – English TECHNICAL DATA Electrode gap Ignition system Air gap Carburettor type mm/inch mm/inch 336: 0,7/0,028 SEM/CD 0,3/0,01 ZAMA C1Q 334T: 0,7/0,028 SEM/CD 0,3/0,01 ZAMA C1Q 338XPT: 0,7/0,028 SEM/CD 0,3/0,01 ZAMA C1Q 339XP: 0,7/0,028 SEM/CD 0,3/0,01 ZAMA C1Q Bar length Chain speed at Chain pitch Drive link max output cm/inch m/s inch mm/inch 336: 33-46/13-18 18,3 3/8/0,0325 1,3/0,050 334T: 29-36/12-14 18,3 3/8 1,3/0,050 338XPT: 29-41/12-16 18,3 3/8 1,3/0,050 339XP: 33-46/13-18 18,3 0,0325 1,3/0,050 Stroke volume Cylinder diameter Stroke length Max. output/speed cm 3 /cubic inch Ø mm/Ø inch mm/inch kW/hp/r/min 336: 35,2/2,1 38/1,5 31/1,22 1,5/2,0/9 600 334T: 35,2/2,1 38/1,5 31/1,22 1,5/2,0/9 600 338XPT: 39,0/2,4 40/1,6 31/1,22 1,7/2,3/9 600 339XP: 39,0/2,4 40/1,6 31/1,22 1,7/2,3/9 600 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

English – 7 TECHNICAL DATA Volume fuel tank Capacity oil pump Volume oil tank Automatic oil pump Litre/US pint cm 3 /min Litre/US pint 336: 0,36/0,76 3-7 0,20/0,42 Yes 334T: 0,3/0,63 3-7 0,16/0,34 Yes 338XPT: 0,3/0,63 3-7 0,16/0,34 Yes 339XP: 0,36/0,76 3-7 0,20/0,42 Yes Weight without chain and bar Weight with chain and bar Handle heater kg/lbs kg/lbs Watt/ r/min 336: 3,8/8,4 4,5/9,8 - / - 334T: 3,4/7,5 4,0/8,8 - / - 338XPT: 3,4/7,5 4,0/8,8 - / - 339XP: 3,8/8,4 3,8/8,4 - / - Idling speed Engage speed Max. speed Spark plug r/min r/min r/min 336: 2 800 4 100 13 800 Champion RCJ7Y NGK BPMR 7A 334T: 2 800 4 100 13 800 Champion RCJ7Y NGK BPMR 7A 338XPT: 2 800 4 100 13 800 Champion RCJ7Y NGK BPMR 7A 339XP: 2 800 4 100 13 800 Champion RCJ7Y NGK BPMR 7A For Husqvarna Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

8 – English TOOLS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

English – 9 TOOLS Pos Description Used for Order No. 1 Piston assembly set Assembling the piston 502 50 70-01 2 Cover plate, inlet Sealing the inlet manifold 502 52 01-01 3 Cover plate exhaust Sealing the exhaust port 502 52 31-01 4 Pressure tester Produce pressure when leakage testing 502 50 38-01 5 Puller Removing bearings from the crankshaft 504 90 90-01 6 Piston stop Locking the crankshaft 502 54 15-01 7 Tachometer Adjusting the carburettor 502 71 14-01 8 Test spark plug Checking the ignition module 502 71 13-01 9 Feeler gauges, air gap Adjustment of the ignition module 502 51 34-02 10 Assembly bar Assembly of the spark plug guard 502 50 06-01 11 Hook for fuel filter Lifting out the fuel filter 502 50 83-01 12 Assembly fixture Assembling the chain saw 502 51 02-01 13 Punch Dismantling the flywheel 502 51 94-01 14 Allen key, 3 mm For M4 bolts 502 50 19-01 14 Allen key, 4 mm For M5 bolts 502 50 18-01 15 Hexagonal screwdriver, 3 mm For M4 bolts 502 50 86-01 15 Hexagonal screwdriver, 4 mm For M5 bolts 502 50 87-01 The tools listed here are service tools intended for use on the chain saw in question. In addition to these tools, a standard set of hand tools is required. For Husqvarna Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

10 – English TROUBLE SHOOTING Starting Idling (low speed) Adjust the L-screw Leaking inlet manifold (rubber) Loose carburettor mounting Loose or faulty fuel pipe Blocked fuel filter Blocked fuel line Tank ventilator blocked Throttle valve axle stiff Throttle sticks Defective throttle return spring Bent valve axle stop Faulty diffuser jet Adjust the L screw Worn needle/needle tip Control system set too high Worn lever arm in the control system Leaking diaphragm/cover plate Control system sticking Does not idle Too rich idling Adjust the L-screw Air filter blocked Choke does not work Worn choke axle Worn choke valve Blocked fuel filter Blocked fuel line Piston ring seized Blocked impulse channel Loose or faulty fuel pipe Hole in diaphragm Worn needle/needle tip Control system sticking Control system set too high Leaking control system (air or fuel) Cover on the carburettor’s pump side is loose Worn needle/needle tip Control system set too high Control system sticking Difficult to start Carburettor leaks fuel Idling (low speed) (continued) Idling with closed L screw Worn needle/needle tip Leaking diaphragm/cover plate Control system sticking Worn lever arm in the control system Faulty diffuser jet Blocked fuel filter Blocked fuel line Leaking inlet manifold (rubber) Loose carburettor mounting Worn throttle valve axle Loose throttle valve screw Worn throttle valve Control system sticking Leaking control system (air or fuel) Control system’s centre knob is worn Hole in diaphragm Leaking diaphragm/cover plate Leaking crankcase Blocked fuel line Control system set too high Control system sticking Leaking control system (air or fuel) Leaking diaphragm/cover plate Faulty diffuser jet Leaking crankcase Control system set too high Control system sticking Damaged control system Worn needle/needle tip Leaking diaphragm/cover plate Incorrectly fitted control system Trouble shooting chart The different faults that can occur on the chain saw are divided into four groups as follows. Within each group possible operating faults are listed to the left while the probable fault alternatives are listed to the right. The most likely fault is listed first, etc. Too much fuel while idling L-screw needs constant adjustment Uneven idling Floods when the engine is not running For Husqvarna Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

Husqvarna 334T / 338XPT / 336 / 339XP Chainsaw Service Repair Manual

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