Stihl SR 430 Manual
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Stihl SR 430 Manual

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STIH)
STIHL SR 430, 450
2009-06

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  • Page 1 STIH) STIHL SR 430, 450 2009-06...

  • Page 2: Table Of Contents

    Housing Stop Buffer on Shroud 50 9.10.3 Manual Fuel Pump 9.11 Fuel Intake 9.11.1 Pickup Body 9.11.2 Fuel Hoses 9.11.3 Connector 9.12 Fuel Tank 9.12.1 Fuel Tank Cap © ANDREAS STIHL AG & Co. KG, 2009 SR 430, SR 450...
  • Page 3 Nozzle / Valve 10.9.1 Nozzle 10.9.2 Valve 10.10 Blower Tube 10.10.1 Pleated Hose 10.10.2 Elbow 10.10.3 Hoses Backplate 11.1 Backplate, SR 430 11.2 Backplate, SR 450 11.3 Harness 11.4 Back Padding Special Servicing Tools Servicing Aids SR 430, SR 450...

  • Page 4: Introduction And Safety Precautions

    Use the part numbers to replacement parts. detailed descriptions of all the repair identify the tools in the They can be identified by the STIHL and servicing procedures specific to "STIHL Special Tools" manual. The part number, the { logo this power tool.

  • Page 5: Safety Precautions

    Improper handling may result in burns or other serious injuries. Install new fuel hoses either dry or with the aid of STIHL press fluid, Do not smoke or bring any fire, b 13. flame or other source of heat near the fuel.

  • Page 6: Specifications

    Operation of tank vent at gauge pressure: 0.5 bar Fuel: as specified in instruction manual Ignition System Air gap between ignition module and fanwheel: 0.15...0.30 mm Spark plug (resistor type): NGK BPMR 7 A Bosch WSR6F Electrode gap: 0.5 mm SR 430, SR 450...

  • Page 7: Tightening Torques

    Screw M 5x18 Muffler/cylinder, bottom Screw P 6x21.5 Hose clamp/blowing attachment M 8x1 Flywheel/crankshaft 20.0 Screw P 5x18 Strainer/blower housing Screw M 5x18 Starter cover/shroud/engine pan Screw M 5x18 Starter cover/shroud/cylinder Screw P 4x12 Shaft/rotary shutter SR 430, SR 450...
  • 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. SR 430, SR 450...

  • Page 9: Troubleshooting

    Coat rewind spring with standard becomes viscous at very low solvent-based degreasant outside temperatures (spring (containing no chlorinated or windings stick together) halogenated hydrocarbons), then pull the rope carefully several times until normal action is restored SR 430, SR 450...

  • Page 10: Blower

    Condition Cause Remedy Blower does not blow Blower wheel loose Tighten down nut on blower wheel firmly Blower wheel blocked Clean blower housing Blower wheel worn or too many Fit a new blower wheel blades broken SR 430, SR 450...

  • Page 11: Ignition System

    Check operation of spark plug. Clean the spark plug or replace if necessary. The carburetor or engine may also be the cause of poor engine running behavior SR 430, SR 450...
  • Page 12 Faulty insulation or short in short Check short circuit wire for short circuit wire circuit to ground Break in ignition lead or insulation Check ignition lead, replace ignition damaged module if necessary Ignition module faulty Install new ignition module SR 430, SR 450...

  • Page 13: Carburetor

    Inlet needle sticking to valve seat Remove inlet needle, clean and refit Diaphragm gasket leaking Fit new diaphragm gasket Metering diaphragm damaged or Fit a new metering diaphragm shrunk Spacer flange damaged Install new spacer flange SR 430, SR 450...
  • Page 14 Setting of low speed screw (L) too Reset low speed screw (L) rich or too lean correctly Setting of idle speed screw (LA ) Reset idle speed screw (LA) incorrect – throttle shutter correctly completely closed SR 430, SR 450...
  • Page 15 Install new fuel suction hose Setting of high speed screw (H) too Check basic carburetor setting, rich correct if necessary Main jet bores or ports blocked Clean or replace the carburetor Pump diaphragm damaged or Fit new pump diaphragm fatigued SR 430, SR 450...

  • Page 16: Engine

    Piston rings worn Fit new piston rings Engine overheating Insufficient cylinder cooling. Air Thoroughly clean all cooling air outlets on blower housing blocked openings and the cylinder fins or cooling fins on cylinder very dirty SR 430, SR 450...

  • Page 17: Arresting Screen

    : Take out the screws (1) and remove the exhaust pipe (2). : Remove the gasket (1). – Carefully place the muffler (1) in position. : Check the position of the gasket and fit the screws (2). SR 430, SR 450...

  • Page 18: Leakage Test

    : Pull the muffler (1) out a little. The engine can be checked thoroughly for leaks with the pump 0000 850 1300. : Fit the test flange (1) 5910 850 4200. SR 430, SR 450...

  • Page 19: Vacuum Test

    0.5 bar. If this nipple (arrow). pressure remains constant for at least 20 seconds, the engine is airtight. – If the pressure drops, the leak must be located and the faulty part replaced. SR 430, SR 450...

  • Page 20: Oil Seals

    – Install the engine pan, b 4.6 : Take out the screw (1). – Degrease the crankshaft taper, b 13 – Install the engine, b 4.5 : Lift the shroud (1) slightly and pull it away. SR 430, SR 450...

  • Page 21: Engine

    : Disconnect the short circuit wire (1) and ground wire (2). – Put the wires to one side. : Tighten down the screw (1) : Push the stop buffer (1) onto the firmly. tapered pin (2). SR 430, SR 450...
  • Page 22 – Remove the container, – line up the holes in the engine SR 430 b 10.1, – Inspect the oil seals and replace and blower housing. SR 450 b 10.2 if necessary, b 4.3 : Insert the screws (arrows) and –...

  • Page 23: Cylinder / Crankshaft

    : Release the crankshaft (1) from home. its bearing seats (arrows) and pull it carefully out of the cylinder. – Reassemble all other parts in the reverse sequence. : Take out the screws (arrows). : Pull off the oil seals (1). SR 430, SR 450...
  • Page 24 If a new cylinder is being installed, recess (arrow) in the cylinder. the spacer flange may be transferred from the old cylinder if it is in good condition. : Take out the screws (arrows). – Remove the spacer flange (1). SR 430, SR 450...
  • Page 25 13 : Push the new oil seals (2), open Make sure the sealant does not side facing the ball bearings, onto project into the engine pan. the crankshaft stubs. – Remove the installing sleeve (1). SR 430, SR 450...

  • Page 26: Bearings / Crankshaft

    – Install the ignition module, b 5.2 – Reassemble all other parts in the reverse sequence. : The crankshaft (1), connecting rod (2) and needle bearing form an inseparable unit. It must always be replaced as a complete unit. SR 430, SR 450...

  • Page 27: Piston

    This operation must be carried out very quickly because heat is absorbed by the crankshaft, and the inner bearing race shrinks. SR 430, SR 450...
  • Page 28 – Inspect the piston rings and replace it if necessary, b 4.8.1 : Place the piston on the connecting rod. : Remove the sleeve (1) 5910 893 1706 from the installing tool (2) 5910 890 2212. SR 430, SR 450...
  • Page 29 The inner pin (arrow) must again point towards the flat face. Fit the snap ring (1) so that its gap (arrow) points down – it must not be near the recess (2). – Check installed position of snap ring. SR 430, SR 450...

  • Page 30: Piston Rings

    : Use a piece of old piston ring to scrape the grooves (arrows) – Reassemble all other parts in the clean. reverse sequence. : Position the new piston rings in the groove so that the radii (arrows) at the ring gaps face upwards. SR 430, SR 450...

  • Page 31: Ignition System

    Ignition timing is fixed and cannot be adjusted during repair work. Since there is no mechanical wear in these systems, ignition timing cannot get out of adjustment during operation. : Disconnect the short circuit wire (1) and ground wire (2). SR 430, SR 450...
  • Page 32 : Fit the screw (3) with washer – do the flywheel magnet. not tighten down yet. The ignition module (1) and ignition lead (2) form a unit. – Check the spark plug boot and replace if necessary, b 5.4 – Troubleshooting, b 3.3 SR 430, SR 450...

  • Page 33: The Ignition Module

    5.7 : Starting at the ignition module, attach the ignition lead (1) to the guides (arrows). Position the ignition lead so that it is not kinked at the ignition module and not under tension. SR 430, SR 450...

  • Page 34: Spark Plug Boot

    2 mm. – Remove the shroud, b 4.4 – Coat the inside of the spark plug boot with STIHL press fluid, While using the ZAT 3, hold it only b 13 by the handle (4) or position it in a : Use suitable pliers to pull the leg safe place.

  • Page 35: Flywheel

    – Unscrew the puller and remove : Push the locking strip (1) – Reassemble all other parts in the the flywheel. 0000 893 5904 into the spark reverse sequence. plug hole until it butts against the cylinder wall – as shown. SR 430, SR 450...

  • Page 36: Short Circuit Wire

    The resistance measured must be : Pull the fuel hoses (1) out of the infinitely high. If not, install a new : Pull off the spark plug boot (1) guides (arrows). throttle cable, b 5.6.2. vertically. SR 430, SR 450...
  • Page 37 : Pull the protective tube (1) out of the guides (arrows). : Pull the protective tube (1) out of – Remove the control levers and its seat (arrow) in the handle cam, b 8 molding. – Remove the valve, b 10.9.2 SR 430, SR 450...
  • Page 38 – Check operation of throttle cable and readjust if necessary, b 9.8.1 – Position the protective tube (1) so that the throttle cable (2) is under the wiring harness (3) in the direction of the blower housing. SR 430, SR 450...

  • Page 39: Ground Wire

    : Connect the ground wire (2) and throttle cable must be replaced. short circuit wire (1) – make sure the connectors are pushed fully – Check for contact and continuity home. and replace the throttle cable if necessary, b 5.6.2 SR 430, SR 450...

  • Page 40: Ignition System Troubleshooting

    – Boot damaged? – If necessary, install new spark plug boot and/ or leg spring, b 5.4 Test ignition system: with ZAT 3 or ZAT 4 (use ZAT 3 as main spark gap see TI 32.94), b 5.3 SR 430, SR 450...
  • Page 41 Check the ignition lead: – Severe chafing? – Spark plug boot: Holes/cracks? – Resistance: spark plug boot to ground: spec. 1.5 – 12 kΩ If necessary, install new spark plug boot and/or ignition lead with module, b 5.2 SR 430, SR 450...
  • Page 42 5.2 Machine runs? 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 4.2, b 5.5 SR 430, SR 450...

  • Page 43: Rewind Starter

    : Insert the screws (arrows) and the rewind spring, must be removed tighten them down firmly. and disassembled. Take particular care when removing the spring. – Clean all components, b 13 – Relieve tension of rewind spring, b 6.4 SR 430, SR 450...

  • Page 44: Rope Rotor

    – Coat starter post and bore in rope rotor with STIHL special – Remove the starter cover, b 6.2 lubricant, b 13 : Pull out the starter rope (1) about 5 cm and hold the rope rotor (2) steady. SR 430, SR 450...

  • Page 45: Starter Rope / Grip

    – Remove remaining rope from the remain on the sleeve while the rope rope rotor and starter grip. its being pulled into the grip. Do not shorten the starter rope. – Remove the rope rotor, b 6.4 SR 430, SR 450...

  • Page 46: Tensioning The

    : Use the starter rope (1) to rotate the rope rotor (2) six turns : Thread the rope (1) through the clockwise. hole in the rotor (arrow). The pawls and spring clip must be installed. The rewind spring is now tensioned. SR 430, SR 450...

  • Page 47: Replacing The

    – The rewind spring may pop out and unwind. – Lubricate the spring with a few When the starter rope is fully drops of STIHL special lubricant extended, it must still be possible to : Push the rewind spring with before installing, b 13...
  • Page 48 – Install the rope rotor, b 6.4 – Install the pawls, b 6.3 – Lubricate pegs on pawls with grease, b 13 – Tension the rewind spring, b 6.6 – Reassemble all other parts in the reverse sequence. SR 430, SR 450...

  • Page 49: Servicing The Av System

    – Remove the blower housing, : Unscrew the bearing plugs (1) – Hold the AV springs (2) steady in SR 430 b 10.7, and (2) from the AV springs. their seats. SR 450 b 10.8 – Screw home the bearing : Fit and tighten down the plugs (1) and (2) as far as stop.

  • Page 50: Av Springs At Bottom

    (arrows) from the bearing stop. plugs. – Install the blower housing, Installing SR 430 b 10.7, SR 450 b 10.8 – Reassemble all other parts in the reverse sequence. AV Springs on Backplate, Metering Unit, SR 450...

  • Page 51: Stop Buffer On Filter Housing Stop Buffer On Shroud

    : Pull off and replace the stop buffer (1). buffer (1). Installing Installing – Use STIHL press fluid to simplify – Use STIHL press fluid to simplify assembly, b 13 assembly, b 13 : Push the stop buffer (1), tapered...

  • Page 52: Control Levers

    (1) into the hole (arrow) position until it snaps into position. – Position c = cold start – Fit the handle molding, b 8.3 – cold engine is started in this position – Check operation. SR 430, SR 450...

  • Page 53: Throttle Trigger/Interlock Lever

    (arrows) – do not overstretch the detent : Remove the throttle trigger (1) spring. and lever (2). – Check the cam (2) and detent – Disconnect the throttle cable (3). spring (1) and replace if necessary SR 430, SR 450...
  • Page 54 : Push the throttle cable nipple (1) into the lever and engage it in the slot (arrow). : Fit the torsion spring (1) on the throttle trigger and position its short leg against the web (arrow). SR 430, SR 450...
  • Page 55 (3). Make sure the contact spring is not bent. Make sure the contact spring is not bent. : Fit the interlock lever (1) into position and engage the torsion spring (arrow). SR 430, SR 450...

  • Page 56: Valve Lever

    (arrow). – Check operation. – Reassemble all other parts in the reverse sequence. : Turn the valve lever (1) clockwise and disconnect it from the rod (2). SR 430, SR 450...

  • Page 57: Metering Lever, Sr

    : Take out the screw (1) and b 8.5.1 remove the cover (2). : Fit the cable (2) in the guide (arrow). – Take out the screw (1). : Remove the metering lever (2) with cable (3). SR 430, SR 450...

  • Page 58: Adjusting The Cable

    : Turn the knurled nut. The sleeve (1) moves in direction of : Fit the cover (1). metering lever (2) = setting shutter to closed. : Insert and tighten down the screw (2) firmly. – Check operation. SR 430, SR 450...

  • Page 59: Fuel System

    : Use screwdriver 5910 890 2420 to unscrew the nuts (arrows). – Remove the baffle (1). : Remove the prefilter (1) and air filter element (2). : Push the lugs (1) into the guides (arrows). – Push the baffle fully home. SR 430, SR 450...

  • Page 60: Air Guide Shroud

    : Engage the end (2) in the guide (arrow). : Pull the ignition lead (1) out of the guides (arrows). : Pull the ignition lead (1) out of the guides (arrows). : Fit and tighten down the screws (1) firmly. SR 430, SR 450...
  • Page 61 – disconnect the rubber and filter housing, b 13 grommet if necessary. Always replace components with : Fit the gasket (1). – Remove the fuel hoses from the damaged sealing faces. lower guides at the same time. SR 430, SR 450...
  • Page 62 – Use STIHL press fluid to simplify : Place the filter housing (1) in : Insert and tighten down the assembly, b 13 position screw (1) firmly. – make sure the wiring harness (2) and fuel hoses are : Push the grommet (1), tapered not pinched.

  • Page 63: Removing And Installing The Carburetor

    Always install new fuel hoses. : Pull the fuel hose (1) off the nipple (arrow). – Press down the throttle lever until the nipple (arrow) projects. : Take the throttle cable (1) out of the pin (2). SR 430, SR 450...

  • Page 64: Leakage Test

    Take care not to damage the new fuel hoses. – Reassemble all other parts in the reverse sequence. : Fit the gasket (1). : Push the hose with nipple onto the carburetor’s fuel nipple (arrow). SR 430, SR 450...

  • Page 65: Servicing The Carburetor

    – Install the carburetor, b 9.5 signs of fatigue. i.e. the diaphragm distorts and swells and has to be replaced. – Reassemble all other parts in the reverse sequence. SR 430, SR 450...

  • Page 66: Inlet Needle

    – Install the metering diaphragm, b 9.6.1 : If there is an annular indentation (arrow) on the – Reassemble all other parts in the sealing cone of the inlet needle, reverse sequence. fit a new inlet needle. SR 430, SR 450...

  • Page 67: Fixed Jet

    : Carefully separate the pump diaphragm (1) and gasket (2). The diaphragm material is subjected to continuous alternating stresses and eventually shows signs of fatigue. i.e. the diaphragm distorts and swells and has to be replaced. SR 430, SR 450...

  • Page 68: Throttle Lever

    : Take out the screw (arrow). position on the end cover. – Move the end cover (1) a little – Pull off the throttle lever (1). until its pegs engage the holes in the carburetor body. SR 430, SR 450...

  • Page 69: Rotary Knob

    : Take out the screw (arrow). : Push the rotary knob (2) onto the choke shaft until it engages, and – Pull off the rotary knob (1). hold it in that position. : Remove the spring (1). SR 430, SR 450...

  • Page 70: Adjusting Screws

    – Check the high speed screw (H) troubleshooting, b 3.4 and replace it if necessary. – Carry out the basic setting, b 9.7.1 : Inspect the tip (arrow) for damage or wear and replace the screw (H) if necessary. SR 430, SR 450...

  • Page 71: Adjusting The Carburetor

    (L). low speed screw L counterclockwise until a speed The air filter must be clean and of 3,000 rpm is obtained installed. – Install a new limiter cap. – Start and warm up the engine. SR 430, SR 450...

  • Page 72: Standard Setting

    9.8.1 The movement of the high speed screw (H) is now limited. – Turn the high speed screw ( H) slowly counterclockwise as far as stop, but no more than a 3/4 turn. SR 430, SR 450...

  • Page 73: Throttle Cable

    – Reassemble in the reverse sequence. Adjusting the throttle cable The throttle lever butts against the idle speed screw (LA) when the throttle trigger is fully depressed (full throttle). SR 430, SR 450...

  • Page 74: Spacer Flange

    : Remove the gasket (1). : Fit the screws (arrows). – Check that gasket is properly seated. – Insert the screws and tighten them down firmly. – Reassemble all other parts in the reverse sequence. SR 430, SR 450...

  • Page 75: Tank Vent

    – Clean the area around the tank vent. : Seal one fuel hose (arrow) with a – If necessary, install a new tank plug. vent or tank, b 9.10 – Pull the fuel suction hose (1) off the nipple (arrow). SR 430, SR 450...

  • Page 76: 9.10.2 Removing And Installing

    – Reassemble in the reverse sequence. – Coat sealing ring of new tank vent with STIHL press fluid, : Squeeze the lugs (arrows) b 13 – Install the fuel tank, b 9.12 together and pull out the manual fuel pump (1).

  • Page 77: Fuel Intake

    : Push the fuel hose (1) onto the requirements, b 1.1 nipple (arrow). – Check operation. – Fuel must be sucked in when the manual fuel pump is operated. Check hose connections if necessary. – Install the shroud, b 4.4 SR 430, SR 450...

  • Page 78: 9.11.2 Fuel Hoses

    : Pull the fuel hose (1) off the carburetor (arrow). : Pull the fuel hoses (1) out of the guides (arrows). : Take out the screws (1) and remove the fuel tank (2). SR 430, SR 450...
  • Page 79 : Push the fuel return hose (1) onto the nipple (arrow). : Press the fuel suction hose (1) into the guide (arrow). – Lay the fuel hoses parallel – do not cross them over. SR 430, SR 450...

  • Page 80: 9.11.3 Connector

    (arrow). – Position the fuel tank (1) so that the holes (arrows) are in alignment. – Coat nipple with STIHL press fluid, b 13 : Fit and tighten down the screws (2) firmly. : Pull the connector (1) with fuel...

  • Page 81: Fuel Tank

    If the fuel hoses and connector are in order – pry out the connector with the fuel hoses attached. : Pry off and replace the – Coat the connector with STIHL grommet (1). press fluid, b 13 – Reassemble in the reverse : Line up the connector (1) and sequence.

  • Page 82: 9.12.1 Fuel Tank Cap

    See instruction manual. – Open the tank cap. – Position the fuel tank (1) so that the holes (arrows) are in – Coat the connector with STIHL alignment. press fluid, b 13 : Fit and tighten down the : Line up the connector (1) with screws (2) firmly.

  • Page 83: Blower And Metering Attachment

    : Rotate the strainer (1) 45° : Pull the bracket (1) out of the counterclockwise and lift it out. guides (arrows). : Take out the screws (1). : Take the container (1) out of the bracket (1). SR 430, SR 450...
  • Page 84 (arrows). : Push the bracket (1) into the guides (arrows). : Push the protective screen (1) into position until the locking tabs (arrow) at both sides snap into place. – Install the blower housing, b 10.7 SR 430, SR 450...

  • Page 85: Metering Unit

    Version with pressure pump 45° clockwise until it engages. – Reassemble all other parts in the : Take out the screws (1). reverse sequence. : Loosen the hose clamps (2). – Pull off the hoses (1). SR 430, SR 450...
  • Page 86 : Remove the lever (2). : Remove the rotary shutter (1). : Position the lever (1) so that the retaining tabs (arrows) engage the web. – Push the lever (1) home until it snaps into place. SR 430, SR 450...
  • Page 87 – Hold the rotary shutter with the toothed pivot pin (1) pointing in the direction of the anti-vibration spring (2). : Fit the rotary shutter (3) in the hole (arrow). : Insert and tighten down the screw (1) firmly. SR 430, SR 450...

  • Page 88: Cable, Sr 450

    – Push home the hoses (1) as far as stop. : Fit and tighten down the hose clamps (2). – Reassemble all other parts in the reverse sequence. : Disconnect the cable (1) from the guide (arrow). – Remove the cover (2). SR 430, SR 450...
  • Page 89 8.5.1. : Engage the cover's retaining tab (1) on the housing (arrow). : Push the cable (1) into the bore (arrow) in the lever. – Turn the cable (1) until it is above the ribs. SR 430, SR 450...

  • Page 90: Pressure Pump

    (arrows) point towards the – Remove the blower housing, container. Installing SR 430 b 10.7, SR 450 b 10.8 : Position the strainer (1) so that the recess (arrows) point in the The strainer is not shown in the direction of the container and illustration.

  • Page 91: Blower Wheel

    – Reassemble all other parts in the reverse sequence. 10.6 Blower Wheel – Remove the blower housing, SR 430 b 10.7, SR 450 b 10.8 – Remove the metering unit, SR 450 b 10.3 : Fit the hoses (1). : Unscrew the blower wheel nut (arrow).
  • Page 92 Installing 10.7 Blower Housing, SR 430 – Remove the filter housing, b 9.4 : Take out the screws (1). – Remove the fuel tank, b 9.12 – Pull the fuel hoses out of the Versions with short back padding guides.
  • Page 93 Version without pressure pump SR 430 versions with and without pressure pump : Remove the screws (1) from the underside of the machine. : Use a screwdriver to ease the hose clamp (arrow) open. : Pull off the blower housing (1).
  • Page 94 10.5 – Transfer the molded hose. – Transfer the AV springs, b 7 – Use STIHL press fluid, b 13 – Check the inner blower : Push the molded hose (1), tab housing (1) and replace it if...
  • Page 95 : Fit and tighten down the hose clamps (3). SR 430 versions with and without pressure pump : Fit the hose (1) in the : Insert and tighten down the guide (arrow). screws (1) on the underside of the machine.

  • Page 96: Blower Housing, Sr

    : Fit and tighten down the screws (2) firmly. : Take out the screws (arrows). – Reassemble all other parts in the : Remove the back padding (1). reverse sequence. : Take out the screws (1). SR 430, SR 450...
  • Page 97 – Transfer the engine, b 4.5 – Transfer the AV springs, b 7 : Take out the screws (arrows). – Remove the outer blower housing (1). : Pull the hose (1) out of the guide (arrow). SR 430, SR 450...
  • Page 98 : Pull out the air guide (1). – Place the outer blower housing (1) in position. : Push the gasket (1) fully home – its lips must locate snugly against : Insert the screws (arrows) and the housing. tighten them down firmly. SR 430, SR 450...

  • Page 99: Nozzle / Valve

    : Use a screwdriver to ease the hose clamp (arrow) open. – Pull off the hose (1). : Push the blower housing (1) with the upper anti-vibration springs into the spring seats (arrow) until they snap into position. SR 430, SR 450...

  • Page 100: 10.9.2 Valve

    – Reassemble in the reverse sequence. : Rotate the rod (2) and pull it out of the piston (arrow). – Inspect the nozzle (1) and metering knob (2) and replace if necessary – Reassemble in the reverse sequence. SR 430, SR 450...
  • Page 101 : Line up the piston and push the rod (2) into the hole (arrow). : Place the valve (1) with spring in its seat (arrow). : Pull the spring (1) and piston (2) out of the valve. SR 430, SR 450...

  • Page 102: Blower Tube

    10.10.1 Pleated Hose 10.10.2 Elbow – Remove the pleated hose – see instruction manual. – Remove the blower housing, SR 430 b 10.7, SR 450 b 10.8 SR 430 version – Hold the valve (1) in the handle housing. – See instruction manual...

  • Page 103: 10.10.3 Hoses

    SR 430, SR 450 versions without SR 430, SR 450 versions with pressure pump pressure pump : Remove the elbow (1). : Inspect the elbow (1) and – Use a screwdriver to ease the – Loosen the hose clamp (2).

  • Page 104: Backplate

    (arrows). – Inspect harness straps and transfer if necessary, b 11.3 : Grip the top of the protective : Push the spring seats (1) into the screen (1) and pull it away. seats (arrow). SR 430, SR 450...
  • Page 105 : Push the clamping strap (1) through the loop (arrow) and – Reassemble all other parts in the remove it. reverse sequence. : Place the protective screen (1) in position so that the lugs (arrow) are above the first web. SR 430, SR 450...

  • Page 106: Harness

    : Thread the loop (1) of the – Push the pin (1) home until it harness strap through the snaps into place. backplate. : Remove the pin (1). – Pull out the strap (2). : Fit the pin (1) through the loop. SR 430, SR 450...

  • Page 107: Back Padding

    11.4 Back Padding : Take out the screws (arrows). : Remove the back padding (1). : Take out the screws (arrows). : Remove the back padding (1). – Reassemble in the reverse sequence. SR 430, SR 450...

  • Page 108: Special Servicing Tools

    Crimping tool 5910 890 8210 Attaching connectors to electrical wires Puller 5910 893 0801 Releasing flywheel Sleeve 5910 893 1706 Sleeve for installing tool 12 Socket DIN 3124, 13 mm 5910 893 5608 Removing flywheel nut SR 430, SR 450...
  • Page 109 Description Part No. Application Rem. Hook 5910 893 8800 Removing pickup body Remarks: 1) Use for releasing only. SR 430, SR 450...

  • Page 110: Servicing Aids

    Oil seals, sliding and bearing points STIHL special lubricant 0781 417 1315 Bearing bore in rope rotor, rewind spring in fan housing STIHL press fluid OH 723 0781 957 9000 Rubber elements, fuel hoses, etc. STIHL multipurpose grease 0781 120 1109...
  • Page 111 englisch / english 0455 454 0123. M3,8. J09. FST. Printed in Germany...

This manual is also suitable for:

Sr 450

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