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Husqvarna 226R Workshop Manual

Brushcutter, trimmer
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Workshop manual
226R RJ RS
English
1 – German

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Summary of Contents for Husqvarna 226R

  • Page 1 Workshop manual 226R RJ RS English 1 – German...
  • Page 2 3. Fuel system ___________________________________ 13 4. Centrifugal clutch ______________________________ 25 5. Angle gear ____________________________________ 31 6. Cylinder and piston _____________________________ 35 7. Crankshaft and crankcase ________________________ 45 8. Tools _________________________________________ 51 9. Technical Data _________________________________ 55 © Husqvarna AB, Sweden 2009...
  • Page 3 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 4 Starter Starter Contents Dismantling _______________________________________ 4 Assembly__________________________________________ 5 Replacing the drive _________________________________ 6...
  • Page 5 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 fl y out. Dismantling Dismantling Remove the 5 bolts and lift off the starter. Remove the 5 bolts and lift off the starter.
  • Page 6 Starter Assembly Assembly Fit the return spring in the starter housing. If the return spring has, despite all the precautions, fl own out or if you intend to fi t a new spring proceed as follows: 1. The lies tensioned with a sturdy steel wire in shrink wrap.
  • Page 7 Starter Tighten the return spring. Tighten the return spring. Check the spring tension. Pull out the starter cord completely and slow the starter pulley with your thumb. Lift the starter cord up out of the cut-out on starter pulley. Then turn the starter pulley anti-clock- wise 5 revolutions.
  • Page 8 Electrical system Electrical system Contents Checking the ignition spark _______________________ 8 Dismantling __________________________________ 10 Assembly_____________________________________ 11...
  • Page 9 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.
  • Page 10 Electrical system If there is still no spark the fault may be If there is still no spark, disconnect the either in the stop switch or in the short- short-circuit cable. circuit cable. If the plug now sparks, the fault is either in Replace any faulty parts.
  • Page 11 Electrical system Still no spark? Still no spark? Check other cables and connections. Check other cables and connections for poor contacts (dirt, corrosion, cable brea- kage and damaged insulation). See chapter 3 “Throttle”. TIP! Use an Ohmmeter in order to easily check if cable breakage has occurred, due to pinching, for example.
  • Page 12 Electrical system Dismantle the centrifugal clutch. Position the piston stop 522 43 18-01 in the spark plug hole so that it is on top of the piston top in the combustion room. Remove both screws (E) that hold the centrifugal clutch. Lift off the clutch.
  • Page 13 Electrical system Assemble the ignition module. Fit the ignition module on the cylinder. Adjust the air gap. NOTE! Do not forget the spacer sleeves between the cylinder and the ignition module. Adjust the air gap between the ignition module and the permanent magnets on 502 50 19-01 the fl ywheel to 0.3 mm and tighten the screws.

  • Page 14: Table Of Contents

    Fuel system Fuel system Contents Air fi lter ______________________________________ 14 Tank venting __________________________________ 15 Fuel fi lter _____________________________________ 15 Carburettor ___________________________________ 16 Assembly ____________________________________ 20 Carburettor settings ____________________________ 20 Throttle handle _______________________________ 21 Trouble Shooting Guide ________________________ 23...

  • Page 15: Air Fi Lter

    Make sure that the air fi lter is free of cleaning agent before it is impregnated with air fi lter oil. TIP! Use Husqvarna’s cleaning agent Active Cleaning no. 505 69 85-70. 505 69 85-70 Impregnate the fi lter with air fi lter oil.

  • Page 16: Tank Venting

    Fuel system Tank 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. • Empty the fuel tank. • Remove the air fi lter cover. •...

  • Page 17: Carburettor

    Fuel system Carburettor Carburettor Dismantling Dismantling 1. Remove the carburettor cover and the Remove the carburettor cover and the air air fi lter. fi lter then blow clean around the carburet- 2. Close the choke valve and blow off any dirt around the carburettor. Dismantle the throttle cable and fuel hoses.
  • Page 18 Fuel system Remove the 4 screws. Dismantle the control diaphragm. These are long and hold together the complete carburettor. Now lift off the fuel pump’s bellows (A), valve housing (B) and control diaphragm. Dismantle the high-speed screw. Dismantle the high-speed screw. Before dismantling, note how many turns it is open.
  • Page 19 Fuel system Dismantle the lever arm and needle valve Loosen the screw and lift off the lever, to check for wear and replacement if axle, needle valve and spring. necessary. Exercise care so that the spring does not fl y out. Check the lever arm and needle valve for Check the wear to the lever arm partly wear.
  • Page 20 Fuel system Assembling the carburettor Assembling the carburettor Walbro WYK Clean and inspect all parts. Clean and inspect all parts. Worn or damaged parts are replaced with Worn or damaged parts are replaced with new ones. new ones. Pay attention to the following when the Pay attention to the following when the carburettor is assembled in the reverse carburettor is assembled in the reverse...

  • Page 21: Assembly

    Fuel system Assembly Assembly Check that the sealing ring is seated cor- Check that the sealing ring is seated rectly. correctly on the carburettor before this is fi tted on the engine. The wide edge on the ring should be near- est to the carburettor housing.

  • Page 22: Throttle Handle

    Fuel system Throttle handle Dismantling If the throttle is to be removed from the handle, only screw (A) needs to be re- moved. If the two halves of the throttle are to be separated, all screws must be removed. NOTE! When lifting off the handle half, be careful that the spring (B) does not get lost.
  • Page 23 Fuel system Assembly 1. Hook the throttle cable (F) into the throt- tle control. 2. Insert the return spring (G) in the hole in the throttle control. 3. Position the throttle control with spring over the bearing pin and tension the spring.

  • Page 24: Trouble Shooting Guide

    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...
  • Page 25 Fuel system...
  • Page 26 Centrifugal clutch Centrifugal clutch Contents Centrifugal clutch, dismantling ___________________ 26 Centrifugal clutch, assembling ___________________ 27 Clutch drum, drive axle and AV element ____________ 27...
  • Page 27 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 28 Centrifugal clutch Twist apart the clutch. Twist apart the clutch and inspect the spring and lining with regard to wear and Inspect and replace damaged or worn damage. parts. The thickness of the lining must be at least 1.0 mm at the most worn point. NOTE! Both clutch shoes should be replaced even if only one of them is...
  • Page 29 Centrifugal clutch Dismantle the AV element. Dismantle the AV element from the clutch housing. Clamp the element with your fi ngers. Use a blunt object, for example a mandrel. Insert the mandrels alternately in the holes in the clutch cover and push the AV ele- ment out.
  • Page 30 Centrifugal clutch Check the inside diameter of the clutch Check the clutch drum for wear. drum. If it exceeds 54,5 mm it should be The diameter must not exceed 54,5 mm. If replaced. this is the case replace the clutch drum. Assemble the diff erent components in the reverse order as set out for dismantling.
  • Page 31 Centrifugal clutch...
  • Page 32 Angle gear Angle gear Contents Dismantling __________________________________ 32 Assembly ____________________________________ 33...
  • Page 33 Angle gear 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 requires to work effi ciently. Secondly, the angle gear contributes towards the operator’s working stance so that it is comfor- table and at the same time effi cient.
  • Page 34 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. Clean all components and inspect them for wear and damage.
  • Page 35 Angle gear Input shaft The input shaft should be fi tted after the output shaft has been fi tted. 1. Fit the ball bearings on the axle. Place the outer ball bearing with the sealed side facing outwards. Do not forget the circlip holding the ball bearings in place.
  • Page 36 Cylinder and piston Cylinder and piston Contents Dismantling ____________________________________ 38 Cleaning, inspection ______________________________ 39 Analysis and actions ______________________________ 39 Service tips _____________________________________ 44 Wear tolerances _________________________________ 44 Assembly_______________________________________ 45...

  • Page 37: 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 38: Cleaning, Inspection

    Cylinder and piston Cleaning, inspection After dismantling, clean the individual components: 1. Scrape carbon deposits from the top of the piston. 2. Scrape carbon deposits from the cylinder’s combustion chamber. 3. Scrape carbon deposits from the cylinder’s exhaust port. NOTE! Scrape carefully with not too sharp a tool so as not to damage the soft aluminium parts.
  • Page 39 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.
  • Page 40 Cylinder and piston Piston damage caused by a too high engine speed. Typical damage from too high engine speed is ruptured piston ring/piston rings, broken circlip on the gudgeon pin, faulty bearings or that the guide pin for the piston ring has become loose.
  • Page 41 Cylinder and piston Foreign objects Everything other than clean air and pure fuel that enters the engine’s inlet port causes some type of abnormal wear or damage to the cylinder and piston. This type of increased wear shows on the piston’s inlet side starting at the lower edge of the piston skirt.
  • Page 42 Cylinder and piston Larger, softer particles that penetrate into the engine cause damage to the piston skirt under the piston ring as the illustration shows. Action: Cause: Fit the air fi lter correctly. • Air fi lter incorrectly fi tted. Fit a new air fi lter.

  • Page 43: Service Tips

    Cylinder and piston Service tips Action: Defect: In severe cases – replace the cylinder. Broken cooling fi ns, damaged threads or sheared bolts by Repair the threads using Heli-Coil. the exhaust port. Polish the damaged area using a fi ne grade emery cloth so Seizure marks in the cylinder bore (especially by the ex- that the coating of aluminium disappears.

  • Page 44: Assembly

    Cylinder and piston Assembly Assembly Lubricate the gudgeon pin’s needle bea- Lubricate the gudgeon pin’s needle bea- ring with a few drops of engine oil. ring with a few drops of engine oil. Direct the arrow on the top of the piston towards the exhaust port.
  • Page 45 Cylinder and piston...
  • Page 46 Crankshaft and crankcase Crankshaft and crankcase Contents Dismantling ____________________________________ 48 Inspecting the crankshaft _________________________ 49 Assembly ______________________________________ 50...
  • Page 47 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 48 Crankshaft and crankcase Dismantle the ball-bearings from the Dismantle the ball-bearings from the crankcase halves. crankcase halves. Heat the crankcase halves to 120°C using a hot air gun. Knock the crankcase half against a woo- Knock the crankcase half against a woo- den block so that the ball-bearing falls out.
  • Page 49 Crankshaft and crankcase Inspect the small end of the connecting Inspect the small end of the connecting rod. rod. If seizure marks or discolouration are found in the bearing track the crankshaft must be replaced. Check the crank bearing. Check the crank bearing. The connecting rod shall not have any radial play (up and down).
  • Page 50 Crankshaft and crankcase Fit the crankshaft in the crankcase half on Fit the crankshaft in the crankcase half on the fl ywheel side. Lubricate the stub axle the fl ywheel side. with a few drops of oil and carefully slide the crankshaft into the bearing.
  • Page 51 Crankshaft and crankcase...
  • Page 52 List of tools Tools Contents Starter _______________________________________54 Electrical system _______________________________54 Fuel system ___________________________________54 Centrifugal clutch ______________________________54 Angle gear ___________________________________55 Cylinder and piston ____________________________55 Crankshaft and crankcase _______________________55 Workshop equipment __________________________55...
  • Page 53 List of tools 522 43 18-01 502 71 14-01 505 69 85-70 502 71 13-01 502 50 18-01 531 00 60-76 522 43 18-01 502 50 19-01 502 50 06-01 531 03 06-23 502 50 83-01 502 50 18-01 502 02 61-02 522 43 18-01 510 13 89-01 501 60 02-03...
  • Page 54 List of tools 502 50 18-01 502 50 18-01 502 50 18-01 502 51 03-01 544 13 05-01 503 97 64-01 502 50 70-01 544 13 08-01 505 38 17-05 531 03 06-23 502 50 70-01 502 71 14-01 544 13 09-01 505 38 17-09 502 50 19-01 505 69 85-70...
  • Page 55 List of tools...
  • Page 56 Technicel data Technical data Contents Engine _______________________________________58 Ignition system ________________________________58 Carburettor ___________________________________58 Clutch _______________________________________58 Driving ______________________________________58 Dimensions ___________________________________58...
  • Page 57 Technicel data Engine Displacement, cm 25.4 Cylinder bore, mm 34.0 Stroke, mm 28.0 Max output, kW / speed, rpm 0.8 / 7500 Ignition system Manufacturer IKEDA Denso Spark plug, NGK BPMR7A Spark plug, electrode gap, mm Max. speed, rpm 11500 Carburettor Manufacturer Walbro WYK...
  • Page 58 11 535 83-26 2018W35...

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