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Husqvarna 131R Workshop Manual
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Husqvarna 131R Workshop Manual

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Workshop manual
131R
English
675 - 002 - 23.04.2018

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Summary of Contents for Husqvarna 131R

  • Page 1 Workshop manual 131R English 675 - 002 - 23.04.2018...

  • Page 2: Table Of Contents

    Contents 1 Introduction 8 Repair instructions 1.1 Document description..........3 8.1 Product overview for repair instructions....21 1.2 Target group............3 8.2 To clean and examine the product parts....21 1.3 Revisions..............3 8.3 Starter..............22 1.4 Safety..............3 8.4 Ignition system............. 24 1.5 Servicing tools............3 8.5 Handle and throttle trigger........28 8.6 Air filter..............

  • Page 3: Introduction

    1.5 Servicing tools The manual gives information about necessary servicing tools. Always use original tools from Husqvarna. 675 - 002 - 23.04.2018 Introduction - 3...

  • Page 4: Safety

    2 Safety 2.1 Safety definitions Use a protective helmet in locations where objects can fall on you. Use approved Warnings, cautions and notes are used to point out hearing protection. Use approved eye specially important parts of the manual. protection. WARNING: Used if there is a risk of injury or death for the operator or bystanders if the instructions in the manual are not obeyed.

  • Page 5: Prepare And Do Servicing On The Product

    3 Prepare and do servicing on the product 3.1 Assembly 3. Make a last adjustment to make sure the product is in a comfortable position when it hangs from the harness. 3.1.1 Introduction WARNING: Read and understand the safety chapter before you assemble the product. 3.1.2 To install the main body 1.
  • Page 6 a) Make sure the stop on the carburettor throttle 3. Turn the output shaft until one of the holes in the cam touches the throttle stop correctly. drive disc aligns with the related hole in the gear housing. b) Make sure the cable position keeps 1-2 mm between cable lug (F) and slot fitting when the 4.
  • Page 7 3.1.7 To attach the cutting attachment guard and 3.1.9 To install the 2-teeth blade in the guard the trimmer head 1. Install the blade in the transport guard. 1. Attach the guard (A) to the shaft and tighten with the bolt (L).

  • Page 8: Function Test

    4. Adjust the harness until the cutting attachment is risk of dangerous injury. The safety distance is parallel to the ground. 15 m. 1. Put the stop switch to the start position. 2. Press the air purge ten times. 5. Let the cutting attachment stay lightly on the ground. Adjust the harness clamp to balance the product correctly.
  • Page 9 6. Pull the throttle trigger lightly and run at low speed for 60 seconds. WARNING: Do not touch the cover. It can burn your skin and cause electrical shock if the spark plug cap is damaged. Do not use a product with damaged spark plug cap. 3.2.3 To start a warm engine 1.

  • Page 10: Servicing Schedule

    3.3 Servicing schedule The descriptions of the maintenance procedures are in the operator's manual. Maintenance task Before After Every 10 Every 25 each use hours hours Clean the external surfaces. √ Clean the air filter. Replace if it is necessary. √...

  • Page 11: Technical Data

    4 Technical data 4.1 Technical data Cylinder displacement Cylinder bore Stroke Max. power/rpm Model /cubic inch Ømm/Øinch mm/inch kW/hp / rpm 967 84 30-xx 32,6/1.99 36/1.42 32/1.26 0.9/7500 967 84 32-xx 967 84 31-xx 32,6/1.99 36/1.42 32/1.26 0.9/7000 967 84 33-xx Electrode gap Model Compression ratio...
  • Page 12 Max speed Idle speed Clutch diameter Engage speed Model mm/inch 967 84 30-xx 7000 3000±300 76/3 4500±300 967 84 32-xx 967 84 31-xx 7000 3000±300 76/3 4500±300 967 84 33-xx Control disc drive Shaft diameter Model Drive gear angle Bevel gear ratio mm/inch Ømm/Øinch 967 84 31-xx...
  • Page 13 Vibration levels Unit 967 84 31-xx 967 84 30-xx Vibration levels (a ) at handles, equipped with trimmer 5,56/6,94 5,56/6,94 hv,eq head, left/right Vibration levels (a ) at handles, equipped with grass 4,59/4,34 4,59/4,34 hv,eq blade, left/right Noise emissions Sound power level, guaranteed (L dB(A) Sound power level, measured - see footnote 2 dB(A)

  • Page 14: Servicing Data

    5 Servicing data 5.1 Service data for the model 967 84 31-xx and the model 967 84 30-xx 3 - 5 Nm 8 - 10 Nm 5 mm 3 - 5 Nm 4 mm 6 - 8 Nm 4 mm 4 - 6 Nm 4 mm 3 - 5 Nm...
  • Page 15 3 - 5 Nm 5 mm 6 - 8 Nm 5 mm 3 - 5 Nm 4 mm 4 - 6 Nm 5 mm 18 - 20 Nm 19 mm 0.6 - 1 Nm 0.6 - 1 Nm 1.2 - 2 Nm 6 - 8 Nm 5 mm 1.5 - 2.5Nm...

  • Page 16: Servicing Tools

    6 Servicing tools 6.1 Servicing tools for 967 84 31-xx and 967 84 30-xx 16 - Servicing tools 675 - 002 - 23.04.2018...
  • Page 17 Item Description Use for Article number Driver Removing the drive 510 13 90-01 Piston stop Locking the piston 522 43 18-01 Test spark plug Checking the ignition spark 502 71 13-01 Ignition cable plier Repairing the ignition cable 502 50 06-01 Flywheel removal tool Removing the flywheel 502 51 49-02...

  • Page 18: Function Overview

    Speak to your dealer when you select an oil. rotating carburetors. • If Husqvarna two-stroke oil is not available, you can use another two-stroke oil of good quality that is intended for air cooled engines. Contact your dealer when you select oil.

  • Page 19: Cutting Equipment

    • Always use a fuel container with an anti-spill valve. • Smaller machines requires small trimmer heads and vice versa. • Make sure that the area near the fuel tank cap is clean. Contamination in the tank can cause • The length of the trimmer line is important.

  • Page 20: To Sharpen Grass Cutters And Grass Blades

    • When a blade thrust occurs, there is a risk that the product or the operator moves out of position. A blade that moves can hit bystanders and there is a risk of injuries. • If a blade is bent, has cracks, is broken or damaged, discard the blade.

  • Page 21: Repair Instructions

    8 Repair instructions 8.1 Product overview for repair instructions 8.2 To clean and examine the product parts 1. Starter 2. Ignition system • Clean and examine all parts fully. You find more 3. Air filter instructions in the chapter for each part if special 4.

  • Page 22: Starter

    8.3 Starter 3. Pull out the starter rope approximately 30 cm. Slow the starter pulley with your thumb. Put the starter rope in the groove in the starter pulley. Let the 8.3.1 To disassemble the starter starter pulley rotate rearward until the spring tension WARNING: Use protective glasses to prevent stops.
  • Page 23 8.3.2 To replace the recoil spring in the starter 3. Put the pulley on the starter pulley and attach the screw. housing 1. Put the recoil spring in the starter groove of the housing. 2. Push down the recoil spring with your thumb on the inner side of the starter housing.

  • Page 24: Ignition System

    7. Put the gasket (K) on the crankcase and attach the 3. Loosen the nut (A). Remove the drive and the screws (H) to the starter housing (J) and crankcase. spacer in the drive disc. Attach screws (G) to the support plate and the bracket (I).
  • Page 25 5. Disconnect the throttle wire from the carburetor. 8. Remove the 2 screws (D), the cables (E), the ignition module (F) and the 2 washers (G). 9. Remove the 2 screws (H) and the spacers that hold the centrifugal clutch. Lift off the clutch. Remove the 2 spacers between the flywheel and the centrifugal clutch.
  • Page 26 11. Attach the center unit to the puller. Tighten the 3. Use a feeler gauge to make sure the distance center bolt and use the holding tool to prevent between the ignition module and the flywheel is 0.3 movement until the flywheel releases. 8.4.2 To assemble the ignition system 1.
  • Page 27 5. Connect the cables. 8.4.3 To examine the ignition spark 1. Disassemble the spark plug cup and the spark plug cover. 2. Remove the spark plug and clean it from particles with a steel brush. 3. Examine the spark plug. If the electrodes are worn more than 50%, replace the spark plug.

  • Page 28: Handle And Throttle Trigger

    8.5 Handle and throttle trigger 6. If no spark occurs, examine the spark plug connection. Remove the spark plug cover and make sure that the ignition cable is not damaged. If it is 8.5.1 To disassemble the handle necessary, remove a part of the cable to get 1.

  • Page 29: Air Filter

    8.5.2 To assemble the handle 3. Remove the air filter (D). 1. Connect the cables to the stop switch. Connect the 4. Remove the air filter holder (E), if it is dirty or stop switch to the handle. damaged. 2. Attach the throttle lock (D). Attach the spring (C). 8.6.2 To clean and examine the air filter Attach the throttle wire (B).

  • Page 30: Fuel Tank

    8.7 Fuel tank 4. Assemble the fuel tank cap. Make sure the seal (F) is not damaged. 8.7.1 To do a fuel tank venting Fuel tank venting must be done correctly for the engine to operate satisfactorily. 1. Empty the fuel tank. 2.

  • Page 31: Carburetor

    8.8.2 To clean and examine the fuel filter 6. Push fuel through the carburetor with the bellows of the fuel pump. Fill all the pipes with fuel. This pushes out all the bubbles that cause blockages in CAUTION: Always replace a damaged fuel filter. the pipes.
  • Page 32 9. Carefully lift up check valve (C) using your nails. a) Examine the connection points against the Clean the valve housing and make sure that the control diaphragm for wear. channels are open. Carefully push the short sides of b) Examine the grooves for the needle valve for the check valve (D) together to make sure that the wear.
  • Page 33 14. Assemble the parts in the opposite sequence as set 15. Replace the nozzle of the carburetor if it is out for disassembling. Make sure that the lever arm damaged. Use a small screwdriver to remove the is flush with the diaphragm housing. If the lever arm nozzle (A) and the small O-ring (B) from the is set too high, too much fuel goes into the carburetor housing.
  • Page 34 8.9.2 Overview of the carburetor on 967 84 31-xx and 967 84 30-xx A. Sealing ring 8.9.3 To assemble the carburetor Overview of the carburetor on 967 84 31-xx and B. Gasket 967 84 30-xx on page 34 for an overview of how the C.
  • Page 35 d) Lower the carburetor in a container with gasoline 5. Connect the fuel hoses and make sure that they are to find leaks. No leakage is permitted. attached correctly. Hold the air filter in position and put the carburetor screws through the air filter holder and carburetor.

  • Page 36: Centrifugal Clutch

    8.10 Centrifugal clutch 4. Remove the 2 screws that hold the centrifugal clutch. Remove the clutch. Remove the flat washers that are behind the clutch shoes. 8.10.1 To disassemble the clutch 1. Loosen the screws and remove the shaft assembly. 2.
  • Page 37 8.10.3 To assemble the clutch 4. Attach the shaft with the screws. 1. Connect the clutch shoes together with the spring. Attach the clutch and the washers on the flywheel. See the turn arrows on the clutch shoes. 8.10.4 To disassemble the clutch drum 1.
  • Page 38 3. Remove the clamp (B) from the clutch drum 8.10.5 To assemble the clutch drum housing. Do not remove the screw (A). Use pliers to 1. Attach the bearing (H). Attach the large snap ring remove the large snap ring (C). Remove the bushing (G).

  • Page 39: Bevel Gear

    8.11 Bevel gear 4. Attach the shaft with the screws. 8.11.1 To disassemble the bevel gear 1. Remove the trimmer head (A). Remove the support flange (Y). Put a rod through the hole (B) to lock the axle. Remove the protective plate (C). Remove the screw (D), the screws (E) and the bracket (F).
  • Page 40 3. Put on protective gloves. Use a hot air gun to 8.11.2 To assemble the bevel gear increase the temperature of the angle gear to 1. Put the cogwheel (V) on the output shaft (U). Attach approximately 110°C - 140°C. Hit the gear housing the 2 bearings (T and X).

  • Page 41: Cylinder And Piston

    3. Put the input shaft assembly (O) into the housing 5. Attach the gear housing (J) on the shaft and tighten with a pair of pliers or a sleeve. the screw (I). Attach the bracket (H) and tighten the screw (G). Attach the bracket (F) and tighten the screw (E).
  • Page 42 8.12.2 To disassemble the cylinder and piston 4. Push the wrist pin from the piston with a punch of the correct dimension. If the wrist pin is too tight, To get access to the 1. Remove parts as given in increase the temperature of the piston with a hot air cylinder and piston on page 41 to get access to the gun.
  • Page 43 8.12.4 Faults and causes 8.12.4.1 Piston damages 675 - 002 - 23.04.2018 Repair instructions - 43...
  • Page 44 Item The piston is not sufficiently lubricated, ex- Cause Procedure ample 1 The piston has small to moderate score The carburetor is incorrectly Examine and adjust the car- marks usually in front of the exhaust port. adjusted. buretor. Very high temperature makes the piston ma- The engine speed is higher terial come off along the piston skirt and cylin- than the recommended...
  • Page 45 Item Piston damage because of a too high engine speed Too high engine speed can cause damage to the piston rings, the snap ring on the wrist pin and the bearings. Too high engine speed can also loosen the guide pin for the piston ring. A too lean carburetor setting results in too high speed and a high piston temperature.
  • Page 46 Item Particles of unwanted material Cause Procedure Unsatisfactorily filtered air that moves through the carburetor and into the engine causes damage to the cylinder and piston. The increased wear is seen on the inlet side of the piston. The wear starts at the lower edge of the piston skirt.
  • Page 47 Other damages on the cylinder/piston Procedure Broken cooling fins, damaged threads or broken bolts by Repair the threads with a thread repair kit. Replace the the exhaust port. cylinder if it cannot be repaired. Score marks in the cylinder bore, especially by the ex- Polish the damaged area with an emery cloth of fine haust port.
  • Page 48 8.12.5.3 To measure the piston ring groove and piston 3. Make sure that the pulse channel in the cylinder is ring play open. Put a new cylinder base gasket on the crankcase. Lubricate the piston and the large end 1. Clean and measure the the piston ring groove (A). bearing with some drops of engine oil.

  • Page 49: Crankshaft And Crankcase

    8.13 Crankshaft and crankcase 4. Use a hot air gun to increase the temperature of the crankcase and the crankcase cover to 110°C. Hit the crankcase and the crankcase cover against a 8.13.1 To disassemble the crankshaft and wooden block to make the bearings fall out. crankcase To get access to the crankshaft and crankcase, you must remove all components of the product.
  • Page 50 8.13.2 To clean and examine the crankshaft and a) Put the bearing in the crankcase and the crankcase cover. crankcase b) Use a hot air gun to increase the temperature of The crankshaft can not be repaired, it must be replaced the crankcase and crankcase cover to 110°C.
  • Page 51 c) Put a new crankcase gasket (F) on the e) Attach the flywheel. crankcase. Use grease to make sure the gasket stays in position. 4. Prepare the crankshaft. a) Lubricate the crankshaft journal with some drops 6. Attach and lubricate the cylinder. of oil and move the crankcase cover (D) into a) Put the cylinder base gasket (I) in the correct position.

  • Page 52: Muffler

    8.14 Muffler 3. Attach the screw (F), the washers (B) and the 2 screws (A). 8.14.1 To disassemble the muffler 1. Remove the 2 screws (A), the washers (B) and the screw (F). 2. Remove the muffler cover (C), the muffler (D) and the heat shield (E).

  • Page 53: Troubleshooting

    9 Troubleshooting 9.1 Troubleshooting Starting The engine is hard to start The stop screw for the throttle does not operate correctly Blocked fuel filter Blocked fuel hose Air in fuel pipes Incorrect/unsatisfactory fuel The needle valve is defective The lever arm of the needle valve is damaged The lever arm of the needle valve does not operate correctly The control diaphragm is damaged The control diaphragm has a defective seal...
  • Page 54 Idle speed (low speed) The idle speed does not become The stop screw for the throttle does not operate correctly stable Blocked fuel filter Blocked fuel hose Air in fuel pipes Incorrect/unsatisfactory fuel The needle valve is defective The carburetor is not attached correctly The lever arm of the needle valve does not operate correctly The needle valve spring is not attached correctly The control diaphragm is damaged...
  • Page 55 High speed Unsatisfactory performance at Blocked fuel filter high speed Blocked fuel hose Air in fuel pipes Incorrect/unsatisfactory fuel Vacuum pulse leakage Blocked vacuum pulse pipe Loose screws on the pump cover Defective pump diaphragm The needle valve is defective The carburetor is not attached correctly The lever arm of the needle valve is damaged The lever arm of the needle valve does not operate correctly...
  • Page 56 1159785-26 2018-06-25...

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