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Husqvarna 334T Workshop Manual

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See also: Operator's Manual
For Husqvarna Parts Call 606-678-9623 or 606-561-4983
334T 338XPT
336 339XP
English
www.mymowerparts.com

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Summary of Contents for Husqvarna 334T

  • Page 1 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 334T 338XPT 336 339XP English www.mymowerparts.com...

  • Page 2: Table Of Contents

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 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 .........

  • Page 3: Introduction

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 INTRODUCTION General Layout This Workshop Manual provides a comprehensive description This Workshop Manual can be used in two different ways: of how to trouble shoot, repair and test the chain saw. A description of different safety measures that should be taken •...

  • Page 4: Safety Instructions

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SAFETY REGULATIONS General instructions Special instructions The workshop where chain saw repairs are to be done must be The fuel used in the chain saw has the following hazardous equipped with safety equipment as set out in local provisions.

  • Page 5: Symbol Explanation

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SYMBOL EXPLANATION Symbols WARNING! Chain saws can be dangerous! Inspection and/or maintenance should be Careless or incorrect usage can result in carried out with the engine switched off, serious injury even death to operator or and with the stop switch in the "STOP"...

  • Page 6: Technical Data

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 TECHNICAL DATA Stroke volume Cylinder diameter Stroke length Max. output/speed /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...
  • Page 7 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 TECHNICAL DATA 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...

  • Page 8: Tools

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 TOOLS – English www.mymowerparts.com...
  • Page 9 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 TOOLS 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. Description Used for Order No.

  • Page 10: Trouble Shooting

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 TROUBLE SHOOTING Trouble shooting chart Idling (low speed) (continued) Idling with closed L Worn needle/needle tip The different faults that can occur on the chain saw are divided screw into four groups as follows. Within each group possible...

  • Page 11: Trouble Shooting

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 TROUBLE SHOOTING High speed Acceleration and retardation Will not run at full Adjust H-screw Does not accelerate Adjust the L-screw throttle Blocked air filter Adjust H-screw Tank ventilator blocked Blocked air filter Blocked fuel filter...

  • Page 12: Service Data 334T/338Xpt

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SERVICE DATA 334T/338XPT 20-26 8-10 Character key 8-10 The numbers by bolted components represent the tightening torque in Nm. = Lubricate using two-stroke oil. = Lubricate using engine oil. = Lubricate using grease.
  • Page 13 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SERVICE DATA 334T/338XPT 2,5-4 8-10 10-15 2,5-4 2,5-4 20-26 English – www.mymowerparts.com...

  • Page 14: Service Data 336/339Xp

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SERVICE DATA 336/339XP 20-26 10-15 8-10 8-10 Character key 8-10 The numbers by bolted components represent the tightening torque in Nm. = Lubricate using two-stroke oil. = Lubricate using engine oil. = Lubricate using grease.
  • Page 15 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SERVICE DATA 336/339XP 2,5-4 2,5-4 2,5-4 20-26 English – www.mymowerparts.com...

  • Page 16: Safety Equipment

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SAFETY EQUIPMENT Chain brake Dismantling Check that the chain brake is off and dismantle the bolt (A) and the clutch cover. WARNING! Check that the brake is on. Otherwise the pressure spring can fly out and cause per- sonal injury.
  • Page 17 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SAFETY EQUIPMENT Assembly Assemble the chain brake as follows: Bolt together the knee joint and brake band. Grease the knee joint’s moving parts and assemble the unit in the cover and knock in the pin (E).

  • Page 18: Chain Catcher

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SAFETY EQUIPMENT Chain catcher Dismantle the chain and bar. See the Operator Guide. Check the spike (J), does not apply to 333, and the chain catcher (K). Replace any components if damaged. The bolts should be tightened to 4 Nm.
  • Page 19 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SAFETY EQUIPMENT Throttle lock and stop function Dismantling, 334T, 338XPT Dismantle the throttle lock as follows: 1. Dismantle the clutch cover and carburettor cover. 2. Knock out the pins (B) and (C) from the left and undo the bolt (D), now pull up the throttle lock (A).
  • Page 20 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SAFETY EQUIPMENT Assembly 334T, 338XPT Assemble the components as follows: Assemble the electrical leads to the lock plate (E) and choke lever/start control (J). Slide in the throttle (H). At the same time, fit the throttle rod (I) on the throttle.
  • Page 21 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SAFETY EQUIPMENT Dismantling 336, 339XP 1. Remove the stop button (A) and both side covers (B) using a small screwdriver. 2. Tap out the pins (C) and (D) using a drift. 3. Remove the throttle lock (E) together with the spring (F).
  • Page 22 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SAFETY EQUIPMENT Assembly 336, 339XP Assemble the parts as follows: Attach the throttle wire (H) to the steel wire and pull back the steel wire and throttle wire through the tank unit. Connect the throttle wire (H) to the throttle valve (I) and then fit the carburettor cover.

  • Page 23: Starter

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 STARTER WARNING! • The return spring is under tension when in its cassette in the starter and can, with careless handing, fly out and cause personal injury. • Care must be exercised when replacing the recoil spring or the starter cord.
  • Page 24 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 STARTER Cleaning and inspection Clean all components and check the following: 1. Starter cord. 2. The dogs on the starter pulley. 3. That the starter dogs on the flywheel are intact, spring back towards the centre and run easily.

  • Page 25: Ignition System

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 IGNITION SYSTEM Dismantling 1. Dismantle the starter (A) and air conductor (B). 2. Remove the spark plug and insert the piston stop (C) in the spark plug hole. See service tools. 3. Loosen the cable (D) from the ignition module. Undo the two M4 bolts (E) and lift out the ignition module (F).

  • Page 26: Ignition System

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 IGNITION SYSTEM Cleaning and inspection Clean all parts, especially the tapers on the flywheel and shafts. Check the flywheel for cracks or any other signs of damage. Assembly Fit the piston stop fully.

  • Page 27: Centrifugal Clutch

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CENTRIFUGAL CLUTCH Dismantling 1. Dismantle the clutch cover. 2. Remove the spark plug and insert the piston stop (A) in the spark plug hole. See service tools. 3. Use a 19 mm spanner and dismantle the clutch hub. NOTE! Left-hand thread.

  • Page 28: Centrifugal Clutch

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CENTRIFUGAL CLUTCH Assembly When changing the springs assemble as follows: A. Fit the two clutch shoes and the two springs and set up the unit in a vice. B. Tighten the vice so that the shoe holder can be pressed down between the clutch shoes.

  • Page 29: Carburettor

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CARBURETTOR Description WARNING! The fuel used in the chain saw has the follow- ing hazardous properties: • The fluid and its vapour are poisonous. • Can cause skin irritation. • Is highly inflammable.

  • Page 30: Carburettor

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CARBURETTOR Operation The carburettor operates differently in the following modes: Cold start mode In the cold start mode the choke valve (D) is fully closed. This increases the vacuum in the carburettor and fuel is easier to suck from all the diffuser jets (E, F and G).
  • Page 31 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CARBURETTOR Primer pump The primer pump is designed to make it easier to start the engine when cold. The pump fills the carburettor with fuel before an attempt is made to start. This also prevents bubbles of vapour from blocking the narrow fuel channels.
  • Page 32 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CARBURETTOR Dismantling, 334T, 338XPT WARNING! The fuel used in the chain saw has the follow- ing hazardous properties: • The fluid and its vapour are poisonous. • Can cause skin irritation. • Is highly inflammable.
  • Page 33 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CARBURETTOR 7. Dismantle the cover (A) on the metering unit and carefully 10. Use a needle or the like and remove the fuel screen (N). remove the control diaphragm (B) with gasket (C).
  • Page 34 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CARBURETTOR Dismantling 336, 339XP WARNING! The fuel used in the chain saw has the follow- ing hazardous properties: • The fluid and its vapour are poisonous. • Can cause skin irritation. • Is highly inflammable.
  • Page 35 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CARBURETTOR 7. Dismantle the cover (A) on the metering unit and carefully 10. Use a needle or the like and remove the fuel screen (N). remove the control diaphragm (B) with gasket (C).
  • Page 36 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CARBURETTOR Cleaning and inspection of the carburettor WARNING! Fuel has the following hazardous properties: • The fluid and its vapour are poisonous. • Can cause skin irritation. • Is highly inflammable. Clean all units in clean petrol.
  • Page 37 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CARBURETTOR 5. Fit the high speed needle (H) as follows: A. Screw in the new H-needle clockwise until it bottoms. Then anticlockwise 3 1/2 turns. B. Press a new locking cap onto the H-needle to the first stop, i.e.
  • Page 38 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CARBURETTOR Assembly 334T, 338XPT (continued) WARNING! The fuel used in the chain saw has the follow- ing hazardous properties: • The fluid and its vapour are poisonous. • Can cause skin irritation. • Is highly inflammable.
  • Page 39 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CARBURETTOR Assembly 336, 339XP (continued) WARNING! The fuel used in the chain saw has the follow- ing hazardous properties: • The fluid and its vapour are poisonous. • Can cause skin irritation. • Is highly inflammable.
  • Page 40 • The air filter should be clean and the carburettor cover fitted when adjustments are made. Adjusting the carburettor with a Your Husqvarna product has been designed and manufactured dirty air filter will give a too lean fuel mixture the next time the according to specifications that reduce harmful gases.

  • Page 41: Tank Unit

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 TANK UNIT WARNING! The fuel used in the chain saw has the follow- ing hazardous properties: • The fluid and its vapour are poisonous. • Can cause skin irritation. • Is highly inflammable.
  • Page 42 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 TANK UNIT Changing the fuel hose and fuel filter Take out the fuel filter with the attached hose with the help of a hook 502 50 83-01. Pull the hose out through the rubber grommet.
  • Page 43 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 TANK UNIT Replacing the tank vent valve, oil tank 334T, 338XPT: 1. Pull out the valve’s rubber fastener using a pair of pliers. 2. Fit a new pin, vyon plug and valve in a new rubber fastener, place the unit in the hole in the tank from the outside.
  • Page 44 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 TANK UNIT Replacing the impulse hose Pull out the old impulse hose using pliers. Insert the new impulse hose from the carburettor side and carefully pull it in from the engine side. – English...
  • Page 45 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 TANK UNIT WARNING! The fuel used in the chain saw has the follow- ing hazardous properties: • The fluid and its vapour are poisonous. • Can cause skin irritation. • Is highly inflammable.

  • Page 46: Av-System

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 AV-SYSTEM Anti vibration system WARNING! The fuel used in the chain saw has the follow- ing hazardous properties: • The fluid and its vapour are poisonous. • Can cause skin irritation. • Is highly inflammable.

  • Page 47: Crankshaft, Piston And Cylinder

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CRANKSHAFT, PISTON AND CYLINDER Dismantling Dismantle the following parts: 1. Bar and chain. See the Operator Guide. 2. Centrifugal clutch. See the chapter "Centrifugal clutch". 3. Muffler. See the chapter "Safety equipment". 4. Carburettor. See the chapter "Carburettor".

  • Page 48: Www.mymowerparts.com

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CRANKSHAFT, PISTON AND CYLINDER Cleaning and inspection Clean all parts, scrape off any sealant from the crankcase and the cylinder’s contact surfaces. Remove carbon deposits from the following areas: The piston crown. Top of the cylinder bore (inside).
  • Page 49 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CRANKSHAFT, PISTON AND CYLINDER Assembly Assembly of the piston and cylinder is carried out as follows: NOTE! Exercise care so that dirt and foreign particles do not enter dismantled parts. 1. Fit the bearing (C) using the a suitable mandrel.
  • Page 50 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 CRANKSHAFT, PISTON AND CYLINDER Removing the decompression valve Disconnect the pipe from the nipples (B and C). Use a ring spanner (15 mm) to remove the valve from the cylinder. Check that the valve can be pressed in easily and springs back out again.

  • Page 51: Bar Bolt

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 BAR BOLT Dismantling Dismantle the following parts: 1. Bar and chain. See the Operator Guide. 2. Centrifugal clutch. See the chapter "Centrifugal clutch". 3. Muffler. See the chapter "Safety equipment". 4. Carburettor. See the chapter "Carburettor".

  • Page 52: Oil Pump

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 OIL PUMP Dismantling Dismantle the following parts: Bar and chain. See the Operator Guide. Centrifugal clutch. See the chapter "Centrifugal clutch". Muffler. See the chapter "Safety equipment". Carburettor. See the chapter "Carburettor". Starter. See the chapter "Starter".

  • Page 53: Oil Pump

    For Husqvarna Parts Call 606-678-9623 or 606-561-4983 OIL PUMP Assembly Assemble as follows: 1. Lubricate and fit the pump piston (B), spring and washer. Press in the unit and at the same time screw in the adjuster screw (A) with the spring and washer.
  • Page 54 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 114 01 43-26 ´®z+H.@¶6f¨ 2003W03 www.mymowerparts.com...

This manual is also suitable for:

338xpt336339xp

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