Husqvarna 333R Workshop Manual
  1. Manuals
  2. Brands
  3. Husqvarna Manuals
  4. Brush Cutter
  5. 333R
  6. Workshop manual

Husqvarna 333R Workshop Manual

Hide thumbs Also See for 333R:
Table of Contents

Advertisement

Quick Links

Workshop manual
333R, 335R
English

Advertisement

Table of Contents
loading

Related Manuals for Husqvarna 333R

Summary of Contents for Husqvarna 333R

  • Page 1 Workshop manual 333R, 335R English...

  • Page 3: Table Of Contents

    2. Electrical system ___________________________ 7 3. Fuel system ______________________________ 13 4. Centrifugal clutch _________________________ 29 5. Angle gear _______________________________ 35 6. Cylinder and piston ________________________ 39 7. Crankshaft and crankcase __________________ 49 8. Tools ___________________________________ 55 © Copyright Husqvarna AB, Sweden 2005...

  • Page 4: General Recommendations

    Operator’s Manual. The assembly of other equipment or accessories or spare parts not approved by Husqvarna can result in the failure to meet these safety demands and that the person carrying out assembly bears responsibility for this.

  • Page 5: Starter

    Starter Starter Contents Dismantling ___________________________________ 4 Assembly ____________________________________ 5 Replacing the drive dogs ________________________ 6...
  • Page 6 Starter 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 Demontering Remove the starter from the engine. Remove the 4 screws and carefully swing down the protective plate so far that the starter can be lifted out.
  • Page 7 Starter Assembly Assembly Clean the component parts and Clean component parts before assemble in the reverse order as set out assembling. for dismantling. Replace the return spring/starter pulley and starter cord, if necessary. NOTE! The return spring and starter pulley are supplied pre-assembled and are fitted in the starter housing as a single unit.
  • Page 8 Starter Fit the starter on the engine body. 1. Check that the rubber bushings (A) are in position in the starter housing. 2. Insert the small tab (B) on the periphery of the starter under the carburettor cover and swing the starter in against the engine body.

  • Page 9: Electrical System

    Electrical system Electrical system Contents Checking the ignition spark __________________ 8 Dismantling ______________________________ 10 Assembly _______________________________ 12...
  • Page 10 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 difficult to see while troubleshooting.
  • Page 11 Electrical system When no spark is obtained, dismantle When there is still no ignition spark, the short-circuit cable from the stop dismantle the short-circuit cable from switch. the stop switch. Still no spark? Remove the connector by prying it up out of the throttle with a knife.
  • Page 12 Electrical system Still no spark? Still no spark? Check other cables and connections. Check other cables and connections for poor contacts (dirt, corrosion, cable breakage and damaged insulation). Make sure that the cables are correctly drawn and lie in the cable grooves. Do not forget to check the cables in the throttle too.
  • Page 13 Electrical system Loosen the screw and slide the cable Loosen the screw (A) and slide the holder (B) forwards. cable holder (B) forwards on the shaft. Remove the screws and slide the cover Remove the screws (C) and slide the (D) forwards.
  • Page 14 Electrical system Remove the nut holding the flywheel. Remove the nut holding the flywheel. Fit the puller on the flywheel. Loosen and remove the nut. 502 51 49-01 Remove the flywheel. Dismantle the flywheel from the crankcase using the puller no.

  • Page 15: Fuel System

    Fuel system Fuel system Contents Air filter ___________________________________ 14 Tank venting _______________________________ 15 Fuel filter __________________________________ 15 Fuel pump _________________________________ 16 Carburettor ________________________________ 16 Throttle ___________________________________ 24 Start throttle speed __________________________ 25 Carburettor settings _________________________ 26...

  • Page 16: Air Filter

    Do not blow the filter clean with compressed air. It can be damaged. Ensure that the filter is dry before refitting it. TIP! Use Husqvarna’s cleaning agent Active Cleaning no. 505 69 85-70. 505 69 85-70 Impregnate the filter with air filter oil.

  • Page 17: Tank Venting

    Fuel system Tank venting Tank venting Tank venting takes place through the Check that the tank venting valve works fuel cap and needs to be functional for correctly. the engine to work. Replace the fuel cap if the valve is •...

  • Page 18: Fuel Pump

    Fuel system Fuel pump Fuel pump The fuel pump facilitates cold starts. The fuel pump has the task of facilitating the start of the engine when The pump cannot be repaired and must cold. The pump fills the carburettor with be replaced if it stops working.
  • Page 19 Fuel system The blending unit The blending unit Fuel and air are mixed here. In this section of the carburettor fuel and air are mixed in the proper proportions. The choke and throttle valves are placed here. In the middle of the venturi (narrowest part of the throughput) the main jet (D) is found.
  • Page 20 Fuel system Pressure test the metering unit. Connect pressure tester 531 03 06-23 to the fuel hose nipple. Lower the carburettor in a vessel with petrol in order to discover any leaks more easily. Test the pressure at 50 kPa. No leakage is permitted.
  • Page 21 Fuel system Remove the pump diaphragm. Remove the bolt holding the cover over the pump diaphragm. Check the diaphragm for damage. Lift off the cover (A), the gasket (B) and Remove the fuel screen and clean it or the diaphragm (C). attach a new one.
  • Page 22 Fuel system Remove the valves and dampers. If these components are worn, idling is disrupted. Always replace the valves and dampers at the same time. Assembling the carburettor Assembling the carburettor Blow the carburettor housing clean. • Blow all channels in the carburettor compartment clean Fit a new plug.
  • Page 23 Fuel system • Mount the valves and dampers. Replace the fuel screen if it is damaged or cannot be cleaned. Place the pump diaphragm closest to the carburettor housing. Then the gasket and cover and the other components in reverse order of removal.
  • Page 24 Fuel system Fit the jet needles and adjust their setting. H = 2 revolution open L = 1,5 revolution open NOTE! The H-needle is a little shorter than the L-needle. Press the stop plugs (A) in position using tool 531 03 03-98. Check that the O-ring is correctly seated and that the plug fits against the ball in the carburettor housing.
  • Page 25 Fuel system The holder for the air filter contains a device that opens two air ducts in the cylinder during acceleration. A rotary valve connected to the throttle valve lever opens the air supply in proportion to the acceleration. The device has the task of preventing uncombusted fuel/air mixture from going directly out into the exhaust channel.

  • Page 26: Throttle

    Fuel system Assembly 1. Fit the rubber connection (A) on the cylinder. Lubricate with oil so it slides into the holes. 2. Fit the heat shield (B). Lubricate the connection sleeves with oil so they slide into the rubber connection. Check that the bush (C) and brass sleeves (D) are seated correctly.

  • Page 27: Start Throttle Speed

    Fuel system Disassemble the throttle control (A), the lock to prevent accidental throttle operation (B), the start throttle lock (C) and the throttle stop (D) in order to check if replacement is necessary. The stop switch can also be disassem- bled now, and replaced if necessary.

  • Page 28: Carburettor Settings

    Fuel system Carburettor settings WARNING! When testing the engine in connection with carburettor adjustment, the clutch and clutch cover must be mounted together with the shaft and angle gear under all circumstances Otherwise there is a risk of the clutch becoming loose resulting in serious personal injury.
  • Page 29 Fuel system NOTE! A tachometer should always be used to find the optimal setting. The recommended max. speed must not be exceeded. 501 60 02-03 502 71 14-01 Idling speed T-screw Let the engine idle for about 30 seconds or until the speed has High speed needle H stabilised.
  • Page 30 Fuel system Setting the L needle Setting the H needle 1. Fit the trimmer head T35 and use 2.7 mm plain cord. The 1. Fit the trimmer head T35 and use 2.7 mm plain cord. cord length should be as standard, i.e. reach the knife on the The cord length should be as standard, i.e.

  • Page 31: Centrifugal Clutch

    Centrifugal clutch Centrifugal clutch Contents Centrifugal clutch – Dismantling ________________ 30 Centrifugal clutch – Assembly _________________ 31 Clutch drum and drive axle – Dismantling ________ 31 Clutch drum and drive axle – Assembly __________ 33...
  • Page 32 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.
  • Page 33 Centrifugal clutch Twist apart the clutch and inspect the Twist apart the clutch. different parts with regard to wear or Inspect the different parts with regard damage. to wear or damage. Pay special attention to the ends of the springs, which in addition to wear, can also show signs of cracking.
  • Page 34 Centrifugal clutch Dismantle the vibration element (C) Press the vibration element (C) together with the clamping sleeve for together with the clamping sleeve out possible replacement. from the connection sleeve with the help of a screwdriver for possible replacement. Dismantle the circlip and press out the Dismantle the circlip using circlip pliers.
  • Page 35 Centrifugal clutch The shaft contains a long guide for the The drive axle is guided in the shaft drive axle. with the help of a star shaped guide (A) which the axle runs through. This Dismantling for possible replacement is prevents axle oscillation, which in turn done by first removing the plastic can cause vibration.
  • Page 36 Centrifugal clutch...

  • Page 37: Angle Gear

    Angle gear Angle gear Contents Dismantling ________________________________ 36 Assembly _________________________________ 37 Drive axle _________________________________ 37...
  • Page 38 Angle gear The angle gear has two purposes: The first is to gear down the engine’s high speed to better suit the lower speed a saw blade or trimmer requires to work efficiently. Secondly, the angle gear contributes towards the operator’s working stance so that it is comfortable and at the same time efficient.
  • Page 39 Angle gear 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.
  • Page 40 Angle gear...

  • Page 41: Cylinder And Piston

    Cylinder and piston Cylinder and piston Contents Dismantling ________________________________ 40 Decompression valve ________________________ 41 Cleaning, inspection _________________________ 41 Analysis and actions _________________________ 42 Service tips ________________________________ 46 Wear tolerances ____________________________ 46 Assembly _________________________________ 47...

  • Page 42: Dismantling

    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.

  • Page 43: Decompression Valve

    Cylinder and piston Decompression valve Decompression valve Clean the decompression valve and Clean the decompression valve with check that the valve head is not white spirit or thinner and blow dry with damaged (burnt) and that the valve compressed air. operates easily.

  • Page 44: Analysis And Actions

    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. Mixing ratio: 1:33 (3%) or 1:25 (4%).
  • Page 45 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 become loose and get trapped between the piston and the cylinder wall.
  • Page 46 Cylinder and piston The guide pin for the piston ring has been Deep, irregular grooves caused by a loose Irregular grooves on the piston’s inlet side pushed up through the top of piston. circlip. Shown here on the piston’s inlet caused by a broken roller retainer.
  • Page 47 Cylinder and piston Cause: Action: Fit a finer grade filter. • Faulty air filter. Small dust particles pass through the filter. • The filter is worn out due to too Check the filter carefully for holes and damage after cleaning. Replace the much cleaning, whereby small holes have appeared in the material.

  • Page 48: Service Tips

    Cylinder and piston Service tips Defect: Action: Broken cooling fins, damaged threads or sheared bolts by In severe cases – replace the cylinder. the exhaust port. Repair the threads using Heli-Coil. Seizure marks in the cylinder bore (especially by the Polish the damaged area using a fine grade emery cloth exhaust port).

  • Page 49: Assembly

    Cylinder and piston Assembly Assembly Clean the crankcase. Clean the crankcase. Fit the piston on the connecting rod so Assemble the piston on the connecting that the arrow on the piston points rod. towards the exhaust port. Lubricate the gudgeon pin’s needle bearing with a few drops of engine oil.
  • Page 50 Cylinder and piston...

  • Page 51: Crankshaft And Crankcase

    Crankshaft and crankcase Crankshaft and crankcase Contents Dismantling ________________________________ 50 Inspecting the crankshaft _____________________ 52 Assembly _________________________________ 52...
  • Page 52 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 between the top and bottom dead centres.
  • Page 53 Crankshaft and crankcase Lift off the plastic piece that separates Lift off the plastic piece that separates the wide flush channel in the the wide flush channel in the crankcase. crankcase. Dismantle the ball-bearings from the Dismantle the ball-bearings from the crankcase halves.
  • Page 54 Crankshaft and crankcase Inspecting the Inspecting the crankshaft crankshaft Inspect the large end of the connecting The crankshaft cannot be reconditioned rod. but must be replaced if it is worn or damaged. Inspect the large end of the connecting rod. If seizure marks, discolouration on the sides or damaged needle holders are found the crankshaft must be replaced.
  • Page 55 Crankshaft and crankcase Fit the sealing rings in the crankcase Fit the sealing rings in the crankcase halves. halves with the help of a suitable punch. Turn the sealing rings so the metal collar faces outwards. Fit the crankshaft, guide sleeves and Fit the crankshaft in the clutch side’s guide rail in the clutch side’s crankcase crankcase half.
  • Page 56 Crankshaft and crankcase Assemble the cylinder. Assemble the cylinder. Position the cylinder base gasket. Lubricate the piston and piston rings with a few drops of oil. Use the piston ring compressor and carefully slide the cylinder into position. Tighten the four screws, crosswise. Assemble the remaining parts in the reverse order as set out for dismantling.

  • Page 57: Tools

    List of tools Tools Contents Starter __________________________________ 56 Electrical system __________________________ 56 Fuel system _____________________________ 56 Centrifugal clutch _________________________ 56 Angle gear ______________________________ 57 Cylinder and piston ________________________ 57 Crankshaft and crankcase __________________ 57 Workshop equipment ______________________ 57...
  • Page 58 List of tools 505 69 85-70 531 00 48-63 502 50 18-01 502 51 91-01 502 50 18-01 502 51 49-01 502 71 13-01 531 00 60-76 502 71 14-01 503 80 17-01 531 03 06-23 502 51 34-02 502 50 06-01 502 50 83-01 531 03 03-98 502 50 18-01...
  • Page 59 List of tools 502 51 03-01 503 97 64-01 502 50 18-01 502 50 18-01 503 80 17-01 502 52 42-01 502 50 70-01 531 03 06-23 502 50 70-01 502 71 14-01 505 69 85-70 101 64 23-48...
  • Page 62 115 00 92-26 2005W23...

This manual is also suitable for:

335r x-series

Table of Contents