Stiga WBE 120 LS Workshop Manual
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Stiga WBE 120 LS Workshop Manual

Stiga WBE 120 LS Workshop Manual

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WORKSHOP MANUAL
WORKSHOP MANUAL
Rel. 0.0
The manufacturer reserves the right to make all the necessary technical or commercial improvements to
its products, so there may be some differences between the series of engines and the contents of this
manual. However the basic specifications and different operating procedures will remain the same.
by STIGA - No use of the illustrations or duplication, reproduction or translation, even partial, of the texts
in this document may be made without explicit authorization.
IMPORTANT NOTICE : The information contained herein is intended for Service Operations and professionals
only, able to competently perform the operations described herein, using the appropriate equipment in
order to safeguard se-curity and performance of the machine. The manufacturer is not liable for damages
or injuries arising from operations performed by individuals or inadequate facilities.
WBE 120 LS - WBE 140 LS
WBE 120 LS - WBE 140 LS
WBE 170 - WBE 170 LS
WBE 170 - WBE 170 LS
WBE 200 - WBE 200 LS
WBE 200 - WBE 200 LS
2022--->
PRODUCTION YEAR

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Summary of Contents for Stiga WBE 120 LS

  • Page 1 However the basic specifications and different operating procedures will remain the same. by STIGA - No use of the illustrations or duplication, reproduction or translation, even partial, of the texts in this document may be made without explicit authorization.

  • Page 3: Table Of Contents

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS CONTENTS INTRODUCTION ..................... 5 1. RULES AND PROCEDURES FOR SERVICE CENTRES .......... 6 1.1. Guarantee validity ..........................6 1.2. Service repairs after guarantee period .....................6 1.3. Fault notification...........................6 1.4. Spare parts request ..........................6 2.
  • Page 4 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS CONTENTS 9. CARBURATION ....................25 9.1. Removing and cleaning the carburettor ..................25 9.2. Replacing the carburettor ........................28 9.3. Adjusting speed ..........................28 9.4. Adjusting the carburation .........................28 10. GOVERNOR SYSTEM OF THE CARBURETTOR ..........29 10.1.

  • Page 5: Introduction

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX INTRODUCTION The purpose of this manual is to provide Service Certain symbols are used in the manual, highlighting Centres with the information needed to perform particularly important information, risks, warnings maintenance on, disassemble and repair the WBE and prescriptions: 120 LS, WBE 140 LS, WBE 170/170 LS, WBE 200/200...

  • Page 6: Rules And Procedures For Service Centres

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 1. RULES AND PROCEDURES FOR SERVICE CENTRES 1.1. Guarantee validity The warranty is supplied under the terms, procedu- res and limits stated in the contract. 1.2. Service repairs after guarantee period The Service Centre must write a report for each intervention containing the serial number of the 3.1], and summary information about...

  • Page 7: General And Safety Regulations

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 2. GENERAL AND SAFETY REGULATIONS 2.3. Precautions during servicing IMPORTANT: Before commencing with any As well as following the usual accident prevention intervention, carefully read the information regulations that apply to most repair shops, we provided in the present manual, in particular recommend you:...

  • Page 8: Warning Labels

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 2. GENERAL AND SAFETY REGULATIONS 2.4. Warning labels 4 - Motor label (see 3.1]) A few labels bearing operator safety instructions or requirements are affixed in full view on the engine 2.5.

  • Page 9: Technical Data And Specifications

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 3. TECHNICAL DATA AND SPECIFICATIONS 3.4. Expendable materials WBE 120LS - WBE 140LS WBE 170/170LS WBE 200/200LS 484479-30/ME110003424/120 WBE170 18162014 EURO(V) Unleaded (green) Petrol minimum 90N.O. - from 5 to 35 °C SAE 30 Engine oil - from -15 to +...

  • Page 10: Tightening Torques

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 3. TECHNICAL DATA AND SPECIFICATIONS 3.6. Tightening torques 55-65 Nm 8-12 Nm 6-10 Nm 8-12 Nm 8-12 Nm 5-7 Nm 8-12 Nm 5-7 Nm 25-32 Nm 8-12 Nm 5-7 Nm 6-10 Nm 8-12 Nm...

  • Page 11: Table Of Tightening Torques

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 3. TECHNICAL DATA AND SPECIFICATIONS 3.7. Table of Tightening torques Chapter Ref. Description of screw Tightening torques Tank fixing screw 8 - 12 Nm 5 - 6 Fixing nuts, starter assembly 6 - 10 Nm Starter screw...

  • Page 12: Identification Of Engine Units

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 3. TECHNICAL DATA AND SPECIFICATIONS 3.8. Identification of engine units For ease of reference, this manual has subdivided maintenance operations into different sections, each of which refers to an engine component unit as indicated in the diagrams below. Starting system Ignition Turning off and Stopping...

  • Page 13: Engine Tuning And Testing

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 4. ENGINE TUNING AND TESTING 4.1. Operating guidelines The engine requires a series of interventions (shown in the table below) in order to ensure minimum basic maintenance. Every 25 Every 50 Every 5 hours...

  • Page 14: Functional Test

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 4. ENGINE TUNING AND TESTING 4.3. Functional test A functional test needs to be carried out at the end of each servicing operation, to check that the operations made are effective.

  • Page 15: Tank And Supply

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 5. TANK AND SUPPLY IMPORTANT: Carefully read the information below before commencing any intervention. General Information The fuel supply system comprises the petrol tank connected to the carburettor by a pipe; a mesh filter at the bottom of the tank prevents deposits and impurities from reaching the carburettor.

  • Page 16: Emptying And Removing The Tank

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 5. TANK AND SUPPLY 5.1. Emptying and removing the tank 1 - Remove the ring (1) of the petrol pipe (2) from the tank side and drain all the fuel from the tank and the pipe into a suitable container.

  • Page 17: Cleaning The Tank

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 5. TANK AND SUPPLY 5.2. Cleaning the tank 5.1]. 1 - Remove the tank 2 - Slide out the filter tube (8) and blow compressed air through it so as to remove any deposits inside. 3 - Keeping the hole (9) in the spigot closed, pour about 100 cc of clean petrol into the tank and shake it vigorously to clean the inside.

  • Page 18: Starting System ( Manual Starter)

    << BACK >> Engines WBE 170 - 200 INDEX 6. STARTING SYSTEM manual starter) General information The starter assembly inside the cover consists of a rope wound around a pulley. The movement from the pulley to the flywheel (and therefore to the engine shaft) is transmitted through a pair of couplings. The return of the pulley and the rewinding of the rope are obtained from a spiral spring.

  • Page 19: Replacing The Hooks

    << BACK >> Engines WBE 170 - 200 INDEX 6. STARTING SYSTEM manual starter) 4 - Rotate the pulley (4) through about 7 complete turns anticlockwise in order to load the spring and hold it still. 5 - Insert one end of the rope (5) (ø 3,2mm - length 2200mm) through the guide in the ventilation grille, into the hole in the pulley (4), and fasten it by tying a knot.

  • Page 20: Starting System ( Electric Starter)

    << BACK >> Engines WBE 120LS - 140LS - 170LS - 200LS INDEX 7. STARTING SYSTEM electric starter) General information The electric starter unit consists of a motor powered by a 12 Volt battery (mounted on the engine). See the relevant section for advice on resolving problems due to the malfunctioning of the star- ting system.
  • Page 21 << BACK >> Engines WBE 120LS - 140LS - 170LS - 200LS INDEX 7. STARTING SYSTEM electric starter) 484479-30/ME110003424/120 4 - Remove the screw (7) securing the tank on the opposite side. WBE170 18162014 EURO(V) 5 - Disconnect the three terminals (8) from the battery bracket.

  • Page 22: Disassembly And Cleaning The Starter Motor Pinion

    << BACK >> Engines WBE 120LS - 140LS - 170LS - 200LS INDEX 7. STARTING SYSTEM electric starter) 9 - By removing the screw (12), the starter motor can be dismantled with all the cables still attached. 10 - When assembling, follow the above operations in reverse order and refit the fuel supply pipe as well.

  • Page 23: Intake System

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 8. INTAKE SYSTEM General information The intake system uses an air filter directly connected to the carburettor by means of a manifold which conveys the air/petrol mixture to the inlet valve. See the relevant section for advice on resolving problems due to the malfunctioning of the air intake system.
  • Page 24 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 8. INTAKE SYSTEM 4 - Bang the air filter element on a hard surface so as to remove excess dirt, and blow it through with compressed air, outwards from the inside. Replace the element if it is too dirty.

  • Page 25: Carburation

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 9. CARBURATION General information The carburettor has a float with a fixed jet and a “AUTO-CHOKE” control. See the relevant section for advice on resolving problems due to carburation. The carburettor is located on the left hand side of the engine.
  • Page 26 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 9. CARBURATION 6 - Remove the tie rod (6) of the AUTO-CHOKE lever by releasing the locking clip (7). Slightly pull out the carburettor to facilitate the release of the intake butterfly shaft.
  • Page 27 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 9. CARBURATION 9 - Unscrew the central screw (14) securing the tank (15) and remove the corresponding OR (16). 10 - Pull out the pin (17), dismount the float (18) and remove the gasket (19).

  • Page 28: Replacing The Carburettor

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 9. CARBURATION It is always advisable to replace the washer (19) and the O-Ring (16) of the float chamber; - the float (18) must oscillate freely on the pin (17); - the jet (20) should never be modified or replaced with others even if they seem to have the same specifications;...

  • Page 29: Governor System Of The Carburettor

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 10. GOVERNOR SYSTEM OF THE CARBURETTOR General information The carburettor governor system uses a engine shaft linkage fitted on a support fixed to the left-hand side of the engine, completed by a counterweight device, driven by the camshaft, and thus sensitive to changes in the engine’s revolution pattern depending on load.
  • Page 30 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 10. GOVERNOR SYSTEM OF THE CARBURETTOR 4 - If the above checks do not show any faults, the phasing of the governor’s control lever (5) with respect to the counterweight device must be checked: - stop the engine and make sure that the lever (5) is in the end run position;...

  • Page 31: Auto-Choke System

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 11. AUTO-CHOKE SYSTEM General information The smart starter system (AUTO-CHOKE System) is a mechanism sensitive to temperature variation that adjusts the starter’s throttle valve, ensuring immediate and proper starting and operating of the engine automatically. The AUTO-CHOKE system assembled on the exhaust unit employs a lever connected to the adjusting pin of the second throttle valve.

  • Page 32: Ignition

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 12. IGNITION General information The ignition system has a flywheel with an electronic coil which supplies high voltage to the spark plug. See the relevant section for advice on resolving problems related to the ignition. The coil and flywheel can be accessed by removing the cover.

  • Page 33: Checking The Starter Micro Switch ( Version With Electric Starter)

    << BACK >> Engines WBE 120LS - 140LS - 170LS - 200LS INDEX 12. IGNITION 12.2. Checking the starter micro switch ( version with electric starter) 1 - Disconnect the two connectors (6). 2 - Using an Ohmmeter tester, (7) make contact with the prods on terminals of the microswitch (8).

  • Page 34: Adjusting The Air Gap And Checking The Coil

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 12. IGNITION 12.3. Adjusting the air gap and checking the coil 1 - Remove the cover and uncouple the conveyor. 2 - Make sure that the earth cable faston (10) of the coil (11) is not oxidized;...

  • Page 35: Replacing The Coil

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 12. IGNITION 12.1]. 7 - Perform a spark test as indicated in - If the spark jumps: the coil functions properly and in the event of malfunction, verify that the cut-off cable (17) is not earthed.

  • Page 36: Turning Off And Stopping The Engine

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 13. TURNING OFF AND STOPPING THE ENGINE General information The engine is turned off and stopped by releasing a lever on the lawnmower. The cable acts on a lever which simultaneously activates a microswitch that sends the coil to earth as well as a brake which acts on the flywheel.

  • Page 37: Checking The Brake

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 13. TURNING OFF AND STOPPING THE ENGINE 13.3. Checking the brake 1 - Remove the cover and uncouple the conveyor. 2 - Check that the thickness of the friction pad (8) is not less than 2 mm at its thinnest point.

  • Page 38: Replacing The System For Turning Off And Stopping The Engine

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 13. TURNING OFF AND STOPPING THE ENGINE 13.4. Replacing the system for turning off and stop- ping the engine 1 - Remove the cover and uncouple the conveyor. 2 - Disconnect the brake wire (2) from the lever (3).

  • Page 39: Exhaust System

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 14. EXHAUST SYSTEM General information The exhaust system consists of a muffler installed on the cylinder with a guard and an inserted gasket. 17]. To solve problems in the exhaust system, see the relevant chapte 14.1. Removing and replacing the muffler 1 - Remove the two screws (1) securing the muffler guard (2).

  • Page 40: Engine Block - External Operations

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 15. ENGINE BLOCK - External operations 15.1. Checking the heating unit seal 1 - Remove the cap (1) and take out the spark plug (2). 2 - Manually set the piston to the TDC (Top Dead Centre) of the compression stroke so that both valves are closed.

  • Page 41: Adjusting The Valve Clearance

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 15. ENGINE BLOCK - External operations 15.2. Adjusting the valve clearance WARNING: The adjustment must be made with the engine is cold. 1 - Remove the cover and demount the spark plug 15.1].

  • Page 42: Dismantling And Replacing The Flywheel

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 15. ENGINE BLOCK - External operations 15.3. Dismantling and replacing the flywheel 1 - Remove the cover and uncouple the conveyor. 2 - Operate the exhaust brake. 3 - Using an airgun, undo the nut (13). 4 - Undo the screw (14) and the stud (15) and re- move the electronic coil (16).

  • Page 43: Blow-By Check

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 15. ENGINE BLOCK - External operations 15.4. Blow-by check 15.3]. 1 - Remove the flywheel and the coil 2 - Loosen the screws (19) that secure the closing plate (20).

  • Page 44: Replacing The Lower Compression Ring Of The Engine Shaft (Sump Side)

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 15. ENGINE BLOCK - External operations 15.6. Replacing the lower compression ring of the engine shaft (sump side) NOTE - Remove the motor from the lawnmo- wer; - drain all the oil from the sump;...

  • Page 45: Engine Block - Overhauling Internal Parts

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 16. ENGINE BLOCK - Overhauling internal parts All the following operations on the grass cutter ne- cessitate the removal of the motor. 16.1. Carter opening 1 - Loosen the lever fixing nut (1), release the spring (2) and remove the control lever (3).

  • Page 46: Dismantling And Checking The Camshaft And Counterweight Governor

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 16. ENGINE BLOCK - Overhauling internal parts 16.2. Dismantling and checking the camshaft and counterweight governor 1 - Bring the piston to the TDC (Top Dead Centre). 16.1].
  • Page 47 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 16. ENGINE BLOCK - Overhauling internal parts 9- In the case of breakage or irregular operation of the counterweights the whole group, fixed by a plate (13) and a screw (14) must be replaced. 10 - Before fitting the camshaft ensure that the two tappets (15) are correctly housed in their seats.

  • Page 48: Dismantling And Checking The Piston, Piston Rings, Connecting Rod And Engine Shaft

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 16. ENGINE BLOCK - Overhauling internal parts 16.3. Dismantling and checking the piston, piston rings, connecting rod and engine shaft NOTE - These paragraphs describe all the operations for checking and overhauling the thermal components of the engine; it is left to the operator to assess the advisability of...
  • Page 49 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 16. ENGINE BLOCK - Overhauling internal parts 10 - To check the wear in the compression rings, insert them one at a time into the cylinder (22) by about 10-15 mm and measure the gap between the two ends with a feeler gauge (25);...
  • Page 50 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 16. ENGINE BLOCK - Overhauling internal parts 14 - Check the diameter of the gudgeon pin (29) in several places and replace it if it is less than 12.95 mm, even at a single point.
  • Page 51 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 16. ENGINE BLOCK - Overhauling internal parts 17 - On the engine shaft (23), removed beforehand, use a digital gauge to check the diameter of the connecting rod pin. The value must not be less than 25,92 mm or the engine shaft will have to be replaced.
  • Page 52 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 16. ENGINE BLOCK - Overhauling internal parts 20 - Fit the connecting rod (19), gudgeon pin (29) and clamping rings (28) to the piston (21). NOTE - The marking on the piston must be directed towards the intake.
  • Page 53 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 16. ENGINE BLOCK - Overhauling internal parts 23 - Mount the engine shaft (23) and the connecting rod cap (18) with the relative screws (20), taking care with the position references (35) so as to avoid inverting the mounting direction of the cap.

  • Page 54: Overhauling The Valves

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 16. ENGINE BLOCK - Overhauling internal parts 16.4 Overhauling the valves NOTE - These paragraphs describe all the operations for checking and overhauling the valves; it is left to the operator to assess the advisabi- lity of performing all the operations described or only part of them, depending on the type of engine problems encountered.
  • Page 55 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 16. ENGINE BLOCK - Overhauling internal parts 6 - Check the free length of the spring (40) and if it is less than 34.50 mm replace the spring. 7 - When mounting: - carefully clean the valve guides and housings of any foreign body;...
  • Page 56 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 16. ENGINE BLOCK - Overhauling internal parts 9 - Close the carter and fix the screws (4) to the 16.1]. indicated couple 10 - During assembly perform the operations 16.1] indicated in section always remember...

  • Page 57: Troubleshooting

    << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 17. TROUBLESHOOTING PROBLEM CAUSE SOLUTION The engine brake cable is faulty or Adjust and/or replace the cable 13.1] unfastened Replace the whole shut-down group The OFF microswitch is faulty 13.2] Check electrical cabling of earth wire Coil earth connection...
  • Page 58 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 17. TROUBLESHOOTING PROBLEM CAUSE SOLUTION The tank cap has a clogged breather Clean and/or replace the cap pipe 5.3] Check correct valve operation 16.4]. Check that the spark plug is he engine starts but does Insufficient pressure 12.1].
  • Page 59 << BACK >> Engines WBE 120LS - 140LS - 170/170LS - 200/200LS INDEX 17. TROUBLESHOOTING PROBLEM CAUSE SOLUTION The engine brake cable is bent or Check and/or adjust the cable 13.1] jammed The engine does not turn off The earth cable is disconnected or Check and/or replace oil breather 12.1] broken...

This manual is also suitable for:

Wbe 140 lsWbe 170Wbe 170 lsWbe 200Wbe 200 ls

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