Stihl MS 231 Manual
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Stihl MS 231 Manual

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STIH)
STIHL MS 231, 251
2010-10

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  • Page 1 All manuals and user guides at all-guides.com STIH) STIHL MS 231, 251 2010-10...

  • Page 2: Table Of Contents

    Rewind Spring 12.5 Carburetor 5.5.1 Quick Chain Replacing 12.5.1 Leakage Test Tensioner the Rewind Spring 5.5.2 Chain Catcher Bar Mounting Stud © ANDREAS STIHL AG & Co. KG, 2010 MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 3 12.10.2 Removing and Installing 12.11 Fuel Intake 12.11.1 Pickup Body 12.11.2 Fuel Hose 12.11.3 Fuel Hoses – Manual Fuel Pump 12.11.4 Manual Fuel Pump 12.11.5 Tank Housing Special Servicing Tools Servicing Aids MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 4: Introduction And Safety Precautions

    M 8 nut (arrow). The machine is held in position on the mounting plate by the screw heads on the engine housing. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 5: Safety Precautions

    Run the machine only with the shroud mounted in position – there is otherwise a risk of injury from the fanwheel and a risk of engine damage due to overheating. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 6: Specifications

    0.30 (+ 0.05/- 0.10) mm Spark plug (resistor type): NGK CMR 6 H Electrode gap: 0.5 mm Chain Lubrication Speed-controlled Ematic oil pump Oil delivery rate: 8.0 (+/3.0) cm /min at 10,000 rpm MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 7: Tightening Torques

    Engine housing / bearing plug Screw D 4x16 Oil pump 1), 3) Screw M 5x16 Muffler / cylinder 10.0 2), 3) M 8x1 Flywheel / crankshaft 28.0 Screw P 4x10 Retainer MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 8 Power screwdriver setting for polymer: DG and P screws max. 500 rpm Do not use an impact wrench for releasing or tightening screws. Do not mix up screws with and without binding heads. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 9: Troubleshooting

    Clutch springs stretched Replace all clutch springs Needle cage damaged Fit new needle cage Clutch shoe retainer broken Install new retainer or clutch Clutch shoes and carrier worn Install new clutch MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 10: Chain Drive, Chain Brake, Chain Tensioner

    Brake spring stretched or broken Fit new brake spring immediately when brake is activated Brake band stretched or worn Fit new brake band Clutch drum worn Install new clutch drum MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 11 Coasting brake does not disengage lever properly even though lockout lever is depressed QuickStop Super Brake cable overtensioned Adjust brake cable Braking action of coasting brake inadequate – lockout lever not depressed MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 12: Chain Lubrication

    Install new oil intake hose damaged Engine housing cracked Install new engine housing Oil pump delivers insufficient oil Oil pump damaged or worn Install new oil pump Worm driver is loose Install new worm MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 13: Rewind Starter

    Spring loop in spring housing not Attach spring loop to carrier attached to carrier Starter rope is difficult to pull – Spring in spring housing fatigued Install new spring housing models with ErgoStart MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 14 (containing no stick together) or moisture has got chlorinated or halogenated onto the rewind spring (spring hydrocarbons), then pull rope windings frozen together) carefully several times until normal action is restored MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 15: Ignition System

    Damaged insulation or break in ignition lead or short circuit. Check ignition lead/module, replace ignition module if necessary. Check operation of the spark plug, clean or replace spark plug if necessary. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 16: Carburetor

    Leak on fuel hose from tank to Seal connections or install new fuel carburetor hose Engine loses power during Sealing ring or spring in accelerator Install new carburetor acceleration pump worn or damaged MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 17 Engine idle speed too high Readjust with idle speed screw LA (counterclockwise) Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Clutch spring hooks broken Replace the clutch springs MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 18 – key in flywheel has sheared off Engine running extremely rich, has Choke shutter does not open Check carburetor and choke shaft, no power and a very low maximum service or replace if necessary speed MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 19: Engine

    Thoroughly clean all cooling air inlets in fan housing blocked or openings and the cylinder fins cooling fins on cylinder very dirty Air inlet in fan housing dirty Clean air inlet on fan housing MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 20: Clutch

    0000 893 5904 must butt against the cylinder wall (arrow) and the flat side of its metal top must rest on the piston crown – as shown in the illustration. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 21: Chain Brake

    0.6 mm. rear handle – the chain must come to an abrupt stop. : Remove the screw (1) from the underside of the machine. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 22: Brake Lever

    – Remove the brake spring from the brake lever. : Insert and tighten down the screws (2) firmly. : Push the brake band (1) over the guide lugs (arrows) and into its seat. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 23 (arrow) is at the top. and strap (2). : Push the brake lever (2) into the : Pull out the flat spring (3). recess in the hand guard (1) and line up the holes. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 24 6.6 : Push the flat spring (1) slightly to one side until the cam of the hand guard (arrow) slips passed it. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 25: Brake Lever On Machines With Quickstop Super

    (2). : Pull out the flat spring (3). : Disconnect the spring (1) from the anchor pin (arrow). – Remove the brake spring (1) from the brake lever. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 26 : Hold the brake lever (2) so that the brake spring attachment point (arrow) is at the top. : Push the brake cable grommet (1) into its seat (arrow) as far as stop. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 27 A certain amount of free travel is necessary to guarantee correct operation of the coasting brake. – Troubleshooting, b 3.2 : Attach the spring (1) to the brake lever (arrow). MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 28: Brake Cable Removing And Installing

    : Use 6mm open end wrench the set free travel on the adjusting – Remove the switch lever, screw (1). b 10.3.1 – Check the brake cable (1) and retainer (2), replace if necessary MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 29 (2). housing. : Push the insert (1) with brake cable (2) into its seat (arrow) as far as stop. – The insert must be flush with the housing ribs. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 30 (1). screw (2) firmly. : Position the brake cable (1) in the guide (arrow). – Install the switch lever, b 10.3.1 – Install the throttle trigger, b 10.3 MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 31: Quick Chain Tensioner

    : Apply tool to the side (arrow) of – Reassemble in the reverse the wing nut (1) and carefully pry sequence. it out of the sprocket cover. – Check the wing nut (1) and replace if necessary MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 32: Bar Mounting Stud

    – Fit the collar stud by hand so that it engages the existing thread. – Screw home the collar stud and tighten it down firmly. – Reassemble all other parts in the reverse sequence. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 33: Engine

    – Remove the exhaust gasket – always install a new exhaust : Fit the new exhaust gasket (1) gasket. and use the tabs (arrows) to line it up on the cylinder. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 34: 6.2 Leakage Test

    – Pull off the boot and unscrew the c = 6 mm spark plug. – Set the piston to top dead center. This can be checked through the spark plug hole. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 35: Pressure Test

    0.5 bar. If this pressure remains constant for at : Connect hose (1) of pump least 20 seconds, the engine is 0000 850 1300 to the airtight. nipple (arrow). MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 36: 6.3 Oil Seals

    14 seal (1). The seating face must be flat and free from burrs. – Degrease the crankshaft taper, b 14 – Reassemble all other parts in the reverse sequence. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 37: Clutch Side

    – Pull out the oil seal. : Use press sleeve (1) 1122 893 2405 to install the oil seal (2). The seating face must be flat and free from burrs. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 38 – Remove the filter base, b 12.3 – Remove the carburetor, b 12.5 – Remove the carburetor carrier, b 12.8 – Remove the air guide shroud, b 12.4 MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 39: Cylinder / Crankshaft

    : Carefully pry the engine pan (1) tighten them down yet. loose at the point shown (arrow) : Push the crankshaft with ball and lift it away. bearings into the bearing seats (arrows). MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 40 (1). b 6.8, b 6.9 seal with its open side facing the ball bearing. – Inspect and clean the sealing face, b 14 MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 41 : Push press sleeve (1) fixing pins in the piston cylinder (2). 1122 893 2405, collar facing grooves (arrows). cylinder, on to the straight and tapered crankshaft stubs as far as stop. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 42 : Position the engine pan (1) so that the tab (2) lines up with the shoulder (3) on the cylinder. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 43: Piston

    150°C (300°F). recess (arrow) and ease it out. : Push the ball bearing (1) onto the tapered crankshaft stub (ignition side) as far as stop. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 44 Fit the snap ring (1) so that its gap (arrow) is on the piston's The inner pin (1) must point towards vertical axis (it must point up). the flat face of the tool's shank (2). MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 45: Piston Rings

    : Position the new piston rings so that the radii face – Install the crankshaft and new oil upward (arrows). seals, b 6.5 – Install the crankshaft, b 6.6 – Install the engine, b 6.5 MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 46: Ignition Timing 9 7.2 Preseparator

    8.2 must be installed if no ignition spark is obtained (after checking that – Pull the boot off the spark plug. wiring and stop switch are in good condition). MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 47: Ignition Module

    – the ground wire terminal must butt against the stop. – Remove the setting gauge. – Check operation – Rotate the flywheel and make sure it does not touch the ignition module. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 48: 14 7.4 Testing The

    – The wiring harness is secure. Module To test the ignition module, use either the ZAT 4 ignition system tester 5910 850 4503 or the ZAT 3 ignition system tester 5910 850 4520. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 49: Ignition Lead

    : Hold the ignition lead and leg connection (5) and the ground spring together and push them terminal (1). into the spark plug boot. High voltage – risk of electric shock. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 50: Flywheel

    – Use locking strip to block the reverse sequence. piston, b 4.2 The flywheel and magnet poles (arrows) must not be damaged or have turned blue. Replace flywheel if necessary. : Unscrew the flywheel nut (1). MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 51 : Pull the short circuit wire (1) and infinitely high. If not, replace the ground wire (2) out of the wiring harness, guides (arrows) in the air guide b 7.7.2. shroud. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 52 : Remove the Master Control mm (a) of the protective tube (3) lever (2). is held as shown – the protective tube must be pushed into the grommet as far as stop. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 53 – Position filter base in the – Install the filter base, b 12.3 carburetor box. : Press the ground wire (5) fully into the guide (arrow). MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 54: Ground Wire

    (arrows) so that the side. marking (2) is at the edge of the guide. – Check operation of switch lever, b 10.1 – Reassemble all other parts in the reverse sequence. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 55 – Reassemble all other parts in the contact spring. reverse sequence. Before pushing the contact spring (1) fully home, lift it a little and ease it over the switch level – no more than 2 mm. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 56: 20 7.8 Ignition System

    – If necessary, install new spark plug boot and/ or leg spring, b 7.5 Test ignition system: with ZAT 3 or ZAT 4 (use ZAT 3 as main spark gap see TI 32.94), b 7.4 MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 57 1.5 – 12 kΩ – Check resistance of ignition lead (spark plug boot and ignition module removed) Spec.: < 10 Ω, If necessary, install new spark plug boot and/or ignition module, b 7.5 MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 58 Machine runs trouble-free, – Look for fault in fuel system or no further action necessary carburetor – Check engine for leaks – Check position of flywheel on crankshaft, b 6.2, b 7.6 MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 59: Rewind Starter

    – Lift the hand guard a little and fit the fan housing in position. : Insert screw (1) with sleeve and screws (arrows) and tighten them down firmly. – Reassemble all other parts in the reverse sequence. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 60: Pawls

    (arrow) and lubricate the spring loop – the pawl moves peg (1), b 14 outwards. – Reassemble all other parts in the reverse sequence. – Reassemble all other parts in the reverse sequence. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 61: Ergostart

    (arrow). – Clean the seats of the pawls (1), b 14 : Fit the E-clips (2). MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 62 – Remove the spring clip and pawl(s), b 8.3 The recess in the hub of the rope rotor is the anchor point for the spring. – Fit the cover washer. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 63 – Secure the rope (1) with a simple of the starter grip. The rewind spring is now tensioned. overhand knot. Hold the rope rotor steady since it will otherwise spin back and may damage the rewind spring. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 64 The starter grip (1) must sit firmly in the rope guide bushing (arrow) without drooping to one side. If this is not the case, tension the spring by one additional turn. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 65 – Secure the spring so that it ErgoStart. cannot pop out. – Install the rope rotor, b 8.5 – Reassemble all other parts in the reverse sequence. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 66 : Fit the rewind spring (1) counterclockwise in the frame, holding the windings steady in the process. The procedure is otherwise the same as that for installing a new rewind spring on models without ErgoStart. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 67: Servicing The Av System

    12.11.5 : Insert and tighten down the screw (1) firmly. – Reassemble all other parts in the reverse sequence. : Unscrew the AV spring (1) with bearing plug (2). MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 68: Av Spring On Handlebar

    : Push the bearing plug (2) – Inspect the spring, bearing plug through the opening. and retainer, replace if necessary. : Push the bearing plug (3) into its seat (arrow). MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 69: Stop Buffers

    – Install the handlebar, b 9.4 : Pry out the stop buffer (1) at the ignition and clutch sides. – Install new stop buffers. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 70: Buffers On Filter Base

    – Check the buffers (1) and replace if necessary : Take out the screw (1). The tapered ends (arrows) must be properly seated on the other sides of the bores. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 71 – Insert the screws and tighten them down firmly. : Push the handlebar (1) out of the lower guide. – Remove the handlebar (1), check it and replace if necessary. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 72: Control Levers

    (arrow) lines up with the web (2). – Remove the short circuit wire from the switch lever, b 7.7.2 : Remove the switch lever (1), check it and replace if necessary. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 73: Throttle Trigger/Lockout Lever

    Installing guide (arrow). : Pull the lockout lever (1) out of its mounts (arrows). : Attach the torsion spring (1) to the trigger (2) – note the installed position (arrow). MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 74 (1) trigger if necessary. in the recesses (arrow). – Check torsion spring and replace – Push down the handle if necessary. molding (1) until it snaps into position. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 75: Quickstop Super

    – take care not to handle molding (1) – Check the switch lever and damage the brake cable. in the recesses (arrow). replace it if necessary – Press the lockout lever down. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 76: Lockout Lever - Quickstop Super

    – Inspect the lockout lever, torsion reverse sequence. spring and bushing, replace as – Check operation of switch lever necessary. – Check operation by operating the lockout lever. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 77: Choke Rod

    (2). guides (arrows). – Put the filter base to one side so that the wires are not under tension. : Pry the filter base (1) out of the buffer (2). MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 78 : Pry the throttle rod (1) out of the carburetor carrier (2). : Push the throttle rod (1) into the guide (2) in the carburetor carrier until it snaps into position. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 79: Chain Lubrication

    : Remove the shim (1). – Reassemble in the reverse sequence. – Push the oil suction hose (1), pickup body first, through the housing bore (arrow). MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 80 : Position the oil suction hose (1) suction hose (2). so that the straight sides of the lugs (arrows) locate against the engine housing. : Push the oil suction hose (1) onto the nipple. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 81 Check correct installed position. : Insert the valve in the housing bore (arrow). – Use a 6 mm drift to carefully drive in the new valve from outside – note installed depth. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 82: Fuel System

    – Remove the contact spring, b 7.7.4 – Remove the switch shaft, b 10.1 : Pry the filter base (1) out of the buffer (2). – Remove the filter base. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 83 – Reassemble all other parts in the assembly, b 14 reverse sequence. : Push the filter base (1) into the buffer (2) – collar of peg must project fully on the other side of the buffer. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 84: Air Guide Shroud

    – Pull the fuel hose out of the air guide shroud. : Take out the screws (1). – Remove the air guide shroud. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 85 – Install the carburetor carrier, b 12.8 – Install the throttle rod, b 10.3.4 – Coat the grommet with STIHL – Install the carburetor, b 12.5 press fluid to simplify installation, b 14 MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 86: Models With Manual Fuel Pump

    : Push the manifold flange (1) out of the air guide shroud (2) in the direction of the cylinder and pull : Take out the screws (1). the air guide shroud away at the same time. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 87 (1) (about 15 cm long) around the back of manifold Installing flange. – Remove the grommet, check and replace if necessary. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 88 12.8 – Install the throttle rod, b 10.3.4 – Install the carburetor, b 12.5 : Push the fuel return hose (1) onto the connector (2) as far as stop. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 89: Carburetor

    : Remove the carburetor (1). – Check the carburetor and service or replace if necessary. – Install a new fuel hose, b 12.11.2 MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 90: Leakage Test

    (arrow). – Install the filter base, b 12.3 : Push the new fuel hose (1) onto – Reassemble all other parts in the the nipples (arrows). reverse sequence. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 91: Servicing The Carburetor

    (2) so that : On versions with a manual fuel pegs (arrows) engage the small pump, check the nipple (2) and holes in the tabs. replace the end cover if necessary. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 92: Pump Diaphragm

    – Install the metering diaphragm, b 12.6.1 : If there is an annular indentation (arrow) on the sealing cone of the inlet needle, fit a new inlet needle. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 93: Lever On Throttle Shaft

    : Use a needle to remove the fuel strainer (1) from the carburetor : Pull off the lever (2). body. Clean or replace the fuel strainer. – Reassemble in the reverse sequence. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 94: Adjusting Screws

    Always install a new limiter cap. Low speed screw : Rotate the limiter cap until the lug (1) is in line with the slot (arrow). : Take out the low speed screw L (1). MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 95 : Screw down the high speed screw H (1) as far as stop. : Pull out the limiter cap (1). – Take out the high speed screw (H). Always install a new limiter cap. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 96: Adjusting The Carburetor

    : Starting with the high speed screw H (1) against its seat, open it 1 1/2 turns counter- clockwise – this is the basic setting. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 97: Standard Setting

    – Turn the idle speed screw (LA) is a risk of engine damage as a counterclockwise until the chain result of lack of lubrication and stops running, then turn it back overheating. 1 full turn. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 98: Carburetor Carrier

    (arrow) and put it to one side. : To fit the manifold (2) through the carburetor carrier's opening, wind a piece of string (1) (about 15 cm long) around the back of manifold flange. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 99: Intake Manifold

    – even very minor damage can cause engine running problems, b 3.7 : Push the washer (1) into position. – Reassemble all other parts in the reverse sequence. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 100: Tank Vent

    – Open the fuel tank cap and drain the fuel tank, b 1. – Close the tank cap. – Remove the carburetor, b 12.5 MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 101: Removing And Installing

    AV spring are in alignment. : Pry the tank vent (1) out of its seat using the rib (arrow) for leverage. Always install a new tank vent. : Take out the screw (1). MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 102: Fuel Intake

    – Pour a small amount of clean – Remove the air guide shroud, gasoline into the tank. Close the b 12.4 tank and shake the saw Models with manual fuel pump, vigorously. b 12.4.1 MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 103 : Take out the screw (1) and pull the retainer (2) out of its seat. : Pull the connector (1) off the fuel hose (2). – Remove the pickup body, b 12.11.1 MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 104 (2) (see arrows) – lug between the ribs (arrows). must locate snugly against connector. : Push the connector (1) into the fuel hose (2) as far as stop. MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 105 (2) firmly. the opening (arrow). – Check position of fuel hose and : Lift the tank housing (2). correct if necessary, b 12.11.2 – Insert screw and tighten it down firmly. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 106: Fuel Hoses - Manual Fuel Pump

    : Pry out the grommet (1). – Replace the fuel return hose. Check the connector and grommet and replace if necessary. : Pull the fuel return hose (1) downwards and out through the opening (arrow). MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 107 : Install the fuel suction hose (1), b 12.11.2 : Pass the fuel return hose (1), connector first, under the brake cable (2). : Install the fuel hose (1), b 12.11.2 MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 108: Manual Fuel Pump

    – Check the oil fuel pump and carburetor connector (6). replace if necessary. – Check operation – fuel must flow when the fuel pump is operated. – Reassemble all other parts in the reverse sequence. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 109: Tank Housing

    – see : Push the AV spring (1) into the parts list. bearing seat (2) so that the lug (3) engages the recess (arrow). : Take out the screw (1). MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 110 Models with manual fuel pump, housing. b 12.4.1 : Pass the fuel return hose (1) upwards through the – Reassemble all other parts in the opening (arrow) and into the reverse sequence. engine housing. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 111: Special Servicing Tools

    5910 850 1650 Clamping machine to assembly stand stand Ignition system tester, ZAT 4 5910 850 4503 Testing ignition system Ignition system tester, ZAT 3 5910 850 4520 Testing ignition system MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 112 Removing bar mounting studs Puller 5910 893 0801 Removing flywheel Setting disk 5910 893 6600 Add-on for screwdriver (adjusting carburetor) Hook 5910 893 8800 Removing pickup body Remarks: 1) Use for releasing only. MS 231, MS 231 C, MS 251, MS 251 C...

  • Page 113: Servicing Aids

    Dirko HT red sealant 0783 830 2000 Sealing engine pan / cylinder Standard commercial solvent- Cleaning sealing faces and carburetor, based degreasant containing no crankshaft stubs and flywheel taper chlorinated or halogenated hydrocarbons MS 231, MS 231 C, MS 251, MS 251 C...
  • Page 114 All manuals and user guides at all-guides.com englisch / english 0455 737 0123. M0. M10. xxx.

This manual is also suitable for:

Ms 251

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