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Stihl 029, 039 Service Manual

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STIHL 029, 039
Service Manual
029 and 039
Chain Saws
As the design concept of these two
models is almost identical, the
descriptions and servicing pro-
cedures in this manual generally
apply to both. Differences are
described in detail.
You should make use of the
illustrated parts lists while carrying
out repair work. They show the
installed positions of the individual
components and assemblies.
Microfilmed parts list are always
more up to date than printed lists.
A fault on the machine may have
several causes. Consult the
"Troubleshooting Charts" when
tracing faults.
Refer to the "Technical Informa-
tion" bulletins for engineering
changes which have been intro-
duced since publication of this
service manual.
Service manuals and technical
information bulletins describing
engineering changes are intended
exclusively for the use of STIHL
servicing dealers and staff and
must not be passed on to third
parties.
Chain saw on assembly stand
Servicing and repairs are made
considerably easier if the saw is
mounted on assembly stand 5910
850 3100 or 5910 890 3100. This
enables the saw to be swivelled to
the best position for the ongoing
repair and leaves both hands free.
The saw can be quickly secured to
the stand by means of the bar
mounting studs and nuts (after
removing the sprocket cover).
The STIHL Special Tools manual
lists all special servicing tools
currently available from STIHL.
Always use original STIHL
replacement parts.
Original STIHL parts can be
identified by the STIHL part
number, the STIHl
STIHl logo and
STIHl
STIHl
the STIHL parts symbol ( The
symbol may appear alone on small
parts.
STIHl
STIHl
STIHl
STIHl
© 1992 Andreas Stihl. Waiblingen
1

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Summary of Contents for Stihl 029, 039

  • Page 1 STIHl STIHl STIHl STIHl logo and out repair work. They show the the STIHL parts symbol ( The installed positions of the individual symbol may appear alone on small components and assemblies. parts. Microfilmed parts list are always more up to date than printed lists.

  • Page 2: Table Of Contents

    STIHL 029, 039 CONTENTS Specifications Ignition System Fuel System Engine Repairing Component 11.1 Air Filter Fuel System Parts 11.2 Removing and Installing Ignition System 5.1.1 Spark Plug the Carburetor Cutting Attachment 5.1.2 Ignition Module 11.3 Leakage Testing Special Accessories 5.1.2.1 Ignition Timing the Carburetor 1.5.1...

  • Page 3: Specifications

    STIHL 029, 039 SPECIFICATIONS Engine STIHL single-cylinder two-stroke engine with special impregnated cylinder bore Displacement: 54.1 cm (3.3 cu.in) 64.1 cm (3.9 cu. in) Bore: 45 mm (1.77 in) 49 mm (1.93 in) Stroke: 34 mm (1.34 in) 34 mm (1.34 in) Compression ratio: 9.5:1...

  • Page 4: Fuel System

    STIHL 029, 039 Fuel System 029 / 039 Carburetor: All position diaphragm carburetor with integral fuel pump Standard setting High speed adjusting screw H: Back off approx. 1 turn Low speed adjusting screw L: Back off approx. 1 turn (starting with screws tight...

  • Page 5: Cutting Attachment

    STIHL 029, 039 Cutting Attachment Guide bars: Rollomatic with sprocket nose Duromatic with stellite-tipped nose Bar tail: 3003 Bar lengths: (32, 37, 40, 45, 50 and 63 cm) (13, 15, 16, 18 and 25 in) Oilomatic chain: 9.32 mm (3/8") Rapid-Micro, Rapid-Super 8.25 mm (0.325") Rapid-Micro,...

  • Page 6: Tightening Torques

    STIHL 029, 039 Tightening Torques "DG" screws are used in the polymer and light-alloy components of models 029 and 039. When screwed in for the first time, DG screws form a permanent thread in the parts concerned. They can be released and retightened as often as necessary without affecting the strength of the screwed assembly.

  • Page 7: Troubleshooting Charts

    STIHL 029, 039 TROUBLESHOOTING CHARTS Clutch, Chain Drive, Chain Brake and Chain Tensioner Condition Cause Remedy Saw chain turns at idle speed Engine idle speed too high Readjust at idle speed adjusting screw (counterclockwise) Spring hooks broken Fit new springs...

  • Page 8: Engine

    STIHL 029, 039 Engine Always check and, if necessary, repair the following parts before looking for faults on the engine: - Air filter - Fuel system - Carburetor - Ignition system Condition Cause Remedy Engine does not start easily, Oil seals between cylinder...

  • Page 9: Ignition System

    STIHL 029, 039 Ignition System Warning: Exercise extreme caution while carrying out maintenance and repair work on the ignition system. The high voltages which occur can cause serious or fatal accidents! Spark plug terminal firmly seated on spark plug? Remove spark plug.

  • Page 10: Rewind Starter

    STIHL 029, 039 Rewind Starter Condition Cause Remedy Starter rope broken Rope pulled out too vigorously as Fit new starter rope far as stop or over edge - i.e. not vertically Normal wear Fit new starter rope Rewind spring broken...

  • Page 11: Chain Lubrication

    STIHL 029, 039 Chain Lubrication Important: In the event of trouble with the chain lubrication system, always investigate the other possible sources of faults before disassembling the oil pump. Condition Cause Remedy Chain receives no oil Oil tank empty Fill up with oil...

  • Page 12: Fuel System

    STIHL 029, 039 Fuel System Note: For machines with automatic choke see 11.6.2. Condition Cause Remedy Carburetor floods; Inlet needle not sealing. Remove and clean or replace engine stalls Foreign matter in valve seat or inlet needle, cone damaged clean fuel tank, pickup body and...
  • Page 13 STIHL 029, 039 Condition Cause Remedy Engine stalls at idle speed Idle jet bores or ports Clean jet bores and ports blocked with compressed air Idle jet "too rich" Screw down low speed adjusting screw slightly (see Carburetor Adjustment) Setting of idle speed...

  • Page 14: Clutch, Chain Drive Chain Brake And Chain Tensioner

    STIHL 029, 039 CLUTCH, CHAIN DRIVE CHAIN BRAKE AND CHAIN TENSIONER 3.1 Clutch Drum and Chain Sprocket Top: Removing needle cage Bottom: Assembly sequence of chain drive 1 = Spur sprocket Top: Top: 2 = Needle cage Sprocket cover mounting nuts...

  • Page 15: Clutch

    STIHL 029, 039 Clutch Top: Removing prefilter Top: Top: Locking strip 0000 893 5902 Unscrewing the clutch Bottom: 1 = Spark plug terminal Bottom: Bottom: 2 = Spark plug Locking strip in position Assembly hook 5910 890 2800 Removing and disassembling...
  • Page 16 STIHL 029, 039 Top: Fitting retainer on Top: clutch shoe Top: Removing a clutch spring Clutch clamped in a vise Bottom: Bottom: Pushing clutch shoe Bottom: Component parts of clutch onto carrier Attaching clutch springs - Use assembly hook to remove all Assembling and installing - Clamp the clutch, e.g.

  • Page 17: Chain Brake

    STIHL 029, 039 Chain Brake 3.3.1 Disassembly Top: Top: Top: Tightening the clutch Bumper strip Detaching brake spring Bottom: Bottom: Bottom: Fitting the prefilter Cover mounting screws Removing the brake band - Screw clutch onto crankshaft - Remove the clutch drum or spur...
  • Page 18 STIHL 029, 039 Top: Removing the Top: brake band Top: Washer on pivot pin E-clip on bell crank pivot pin Bottom: Bottom: Hand guard mounting Bottom: 1 = Hand guard screw Removing the link (strap) 2 = Bell crank - Remove the brake band from the...
  • Page 19 STIHL 029, 039 3.3.2 Assembly Top: 1 = Spring Top: 2 = Cam lever Pressing cam lever 3 = E-clip downward Bottom: Bottom: Fitting bell crank in Correct installed position Disconnecting the spring hand guard of hand guard - Remove the E-clip from the cam lever pivot pin.
  • Page 20 STIHL 029, 039 Top: Top: Fitting the link Top: Assembly tube 1117 890 0900 Fitting the brake band Bottom: Bottom: Attaching brake band to bell Bottom: Attaching brake spring to crank Attaching the brake spring anchor pin - Fit the washer on the bell crank...

  • Page 21: Front Chain Tensioner

    STIHL 029, 039 Side Chain Front Chain Tensioner Tensioner Top: 1 = Adjusting screw Top: 2 = Adjusting nut Cover mounting screw a = 19.5 mm (0.77") Bottom: b = 1.7 mm (0.07") Bottom: c = ∅ 10 mm (0.4")

  • Page 22: Bar Mounting Studs

    STIHL 029, 039 Bar Mounting Studs Top: 1 = Thrust pad 2 = Tensioner slide 3 = Adjusting screw 4 = Spur gear 5 = Cover Bottom: Removing tensioner slide Unscrewing collar stud with Withdrawing the spur gear and adjusting screw...

  • Page 23: Engine

    STIHL 029, 039 ENGINE Removing and Refitting Exhaust Muffler Top: Top: Top: Removing the cover Gasket Flanged locknuts on muffler Bottom: Bottom: Bottom: Removing the muffler Removing the spark arresting screen Removing the screws These machines do not have a - Remove the gasket.

  • Page 24: Leakage Testing The Engine

    STIHL 029, 039 Leakage Testing 4.2.1 Preparations the Engine Top: 1 = Sealing plate 0000 855 8106 2 = Flange 1123 855 4200 Top: 3 = Sleeves 1127 851 8300 Carburetor and crankcase tester 1106 850 2905 Bottom: Sealing plate between...

  • Page 25: Pressure Test

    STIHL 029, 039 4.2.2 Pressure Test Top: 1 = Bore No. 1 Top: Top: 2 = Bore No. 2 Tester's pressure hose fitted on test flange nipple Flange 1123 855 4200 fitted in position Bottom: Bottom: Bottom: Test flange fitted in position...
  • Page 26 STIHL 029, 039 4.2.3 Vacuum Test Tester's suction hose connected Pressure-testing the engine to nipple on test flange Oil seals tend to fail when subjected to a vacuum, i.e. the sealing lip lifts away from the crankshaft during the piston's induction stroke because there is no internal counterpressure.

  • Page 27: Replacing The Oil Seals

    STIHL 029, 039 Replacing the Oil Seals Top: Puller 0000 890 4400 with No. 6 jaws 0000 893 3711 Bottom: Removing oil seal at clutch side Leakage test with vacuum pump detected in the pressure test. It is not necessary to disassemble...
  • Page 28 STIHL 029, 039 Top: Installing oil seal with press sleeve 1127 893 2400 Replacement oil seal 1 = Sealing lip Bottom: 2 = Clamping ring Removing oil seal at Installing oil seal without 3 = Dust lip ignition side press sleeve...

  • Page 29: Removing And Installing The Engine

    STIHL 029, 039 Removing and Installing the Engine Top: Top: Cover mounting Bar mounting screws stud 1 = Spark plug terminal Bottom: Bottom: 2 = Spark plug Ground wire Engine housing/engine 3 = Ignition lead retainer fastening screw mounting screws...

  • Page 30: Cylinder

    STIHL 029, 039 Cylinder Top: Top: Impulse hose Removing the engine Correct position of ignition lead Bottom: Bottom: in cover 1 = Hose clamp Sequence for tightening screws 1 = Tank vent 2 = Manifold - Fit mounting screw 1 as far as stop.
  • Page 31 STIHL 029, 039 Top: Fitting clamping strap on piston rings Top: Bottom: Inner contour of cylinder 1 = Piston pin Correct position of 2 = Channel section on Bottom: piston rings clamping strap Clamping strap 1127 893 2600 - Pull the engine pan off the cylinder.
  • Page 32 STIHL 029, 039 Top: Straight faces on manifold and Top: intake port Fitting the piston 1 = Long crankshaft stub Bottom: Bottom: 2 = Tapped hole for bar Correct position of hose clamp 1 = Long crankshaft stub mounting stud a = 8 mm (5/16")

  • Page 33: Piston

    STIHL 029, 039 Piston Top: Pushing out piston pin Top: Top: Needle cage in small end Removing snap ring Bottom: Piston rings Bottom: Bottom: 1 = "N" marking on piston 1 = Installing tool 5910 890 2210 Assembly drift 1110 893 4700...
  • Page 34 STIHL 029, 039 Top: Modified sleeve a = 16 mm ( ") Top: Slipping sleeve onto other end of b = 8 mm ( ") Top: c = 20 mm ( ") shank 1 = Flat on end of shank...

  • Page 35: Piston Rings

    STIHL 029, 039 Piston Rings Top: Top: Installing the piston pin Piston ring grooves Bottom: 1 = Mark (arrow) Bottom: Insetting snap ring with installing 2 = Long crankshaft stub Fitting piston ring tool 5910 890 2210 Note: The snap ring must be fitted so...

  • Page 36: Crankshaft

    STIHL 029, 039 Crankshaft Top: 1 = Crankshaft Top: 2 = Connecting rod Ball bearings 1 = Sealing lip Bottom: Bottom: 2 = Clamping ring Oil seals Closed side of ball bearing - Pack space between sealing and dust lips of oil seals with grease - see 12.2.

  • Page 37: Parts

    Sooted or carbonized spark plug: - Use brass wire brush to clean the spark plug and then blow it clear STIHL 029 and 039 chain saws are with compressed air. equipped with an electronic (breakerless) magneto ignition Note: Never use a steel wire system which requires no outside brush for this job.
  • Page 38 STIHL 029, 039 Warning: Do not touch any live Checking the spark plug: Note: Chafed insulation on the ignition parts - contact with high voltage lead or short circuit wire will cause a Accurate checking of the spark plug can cause serious or fatal short-circuit to ground.

  • Page 39: 5.1.2.1 Ignition Timing

    STIHL 029, 039 5.1.2 Ignition Module 5.1.2.1 Ignition Timing 5.1.2.2 Removing and Installing Top: 1 = Spark plug terminal 2 = Ignition lead retainer 3 = Groove Bottom: 1 = High voltage output 1 = Lead retainer 2 = Connector tag...
  • Page 40 STIHL 029, 039 Top: Ignition module mounting screws Top: Removing lead retainer Bottom: Pulling the unscrewed ignition lead Bottom: Setting gauge fitted between out of ignition module Setting gauge 1127 890 6400 flywheel and ignition module Important: Secure ground wire with upper screw and fit a washer on the lower screw.

  • Page 41: 5.1.4 Ignition Lead

    STIHL 029, 039 5.1.3 Spark Plug Terminal Top: Top: Fitting the leg spring Removing dust seal Bottom: Bottom: Correct position of leg spring in spark Pulling leg spring out of spark plug terminal Fitting dust seal plug terminal - Unhook the leg spring from the...

  • Page 42: Flywheel

    STIHL 029, 039 5.1.4 Ignition Lead 5.1.5 Flywheel Top: Locking strip 0000 893 5902 in Top: cylinder Grommet Bottom: Bottom: Pulling ignition lead out of Fan housing mounting tank housing screws Piercing center of ignition lead - Cut new ignition lead to length (see parts list or cut to same length as old lead).
  • Page 43 STIHL 029, 039 Top: Top: Flywheel mounting nut Puller 1116 893 0800 Bottom: 1 = Flywheel Bottom: Removing the flywheel 2 = Magnet poles Puller fitted in position - Inspect the condition of the flywheel. If you find any damage (e.g.

  • Page 44: Ground Wire

    STIHL 029, 039 5.1.6 Short Circuit Wire/ 5.1.7 Contact Spring Ground Wire Top: Ground wire fastening screw Top: Ground wire terminal Bottom: Withdrawing short circuit wire and Bottom: ground wire Grommet Removing contact spring - Pull the short circuit and ground wires out of the hole in the engine housing.

  • Page 45: Routine Maintenance

    5 cm (2 - 3 in) Lubricate the rewind spring and and hold the rope rotor steady. starter post with STIHL special lubricant, see 12.2, before instal- - Take two turns of the rope off the ling.
  • Page 46 12.2, and then fit the pawl. - Coat the bore in the rope rotor with STIHL special lubricant - see 12.2. Fit the rotor on the starter post so that the inner spring loop slides into the lug on the rotor.

  • Page 47: Replacing The

    STIHL 029, 039 Replacing the Tensioning the Rewind Spring Rewind Spring Top: Position of anchor loop a = Top: 20 mm (3/4") Tensioning the rewind spring Bottom: Bottom: Fitting rewind spring with aid of wooden Rewind spring in position Straightening twisted rope assembly block 1108 893 4800 Remove the rope rotor, see 6.2.

  • Page 48: Replacing The

    STIHL 029, 039 Replacing the Starter Rope Guide Bush Top: Installing tool 0000 890 2201 Bottom: Flaring the new rope Grip on fan housing Rope guide bush guide bush - Hold the starter grip firmly to The wear on the guide bush is keep the rope tensioned.

  • Page 49: Av Handle System

    STIHL 029, 039 AV HANDLE SYSTEM Repair Top: Top: Removing annular buffer from front Fitting buffer in front handle Top: 1 = Groove handle Removing plug Bottom: Bottom: Bottom: Removing lower annular buffer from Fitting buffer in engine housing Fitting buffer in engine housing...
  • Page 50 STIHL 029, 039 HANDLE HOUSING 8.1.1 Removing and Installing Handle Housing Front Handle Top: Top: Top: Front handle mounting 1 = Washer Lower mounting screws on front screws 2 = Sleeve handle Bottom: Bottom: Bottom: Removing the front handle Withdrawing short circuit wire...
  • Page 51 STIHL 029, 039 Top: Top: Top: Removing grommet Removing annular buffer Ground wire Bottom: Bottom: Bottom: Removing the impulse Removing handle housing and Plug pushing out manifold at same time hose - Ease the grommet for the ground - Push the annular buffer out of the...
  • Page 52 STIHL 029, 039 Top: 1 = Bore for impulse hose 2 = Grommet for ground and short circuit Top: wires Top: Pulling manifold into handle 3 = Impulse hose Annular groove housing intake opening 4 = Fuel hose Bottom: Bottom:...

  • Page 53: Master Control

    STIHL 029, 039 MASTER CONTROL Switch Shaft Top: Positions of Master Removing connector sleeve Control lever: 1 = Seat on switch shaft Top: 1 = STOP Withdrawing the switch shaft 2 = RUN Bottom: 3 = START (warm start) Detaching the switch...

  • Page 54: Interlock Lever

    STIHL 029, 039 Interlock Lever/ Throttle Trigger Top: 1 = Cylindrical pin Top: Top: 2 = Torsion spring 1 = Interlock lever Withdrawing interlock lever 3 = Throttle trigger 2 = Throttle trigger 3 = Master Control lever Bottom: Bottom:...

  • Page 55: Chain Lubrication

    STIHL 029, 039 CHAIN LUBRICATION 10.1 Suction Hose/Pickup Body Top: Top: Top: Removing the strainer Pulling out suction hose with Removing suction hose from oil pickup body Bottom: pump nipple 1 = Hose Bottom: Bottom: 2 = Connector Pulling pickup body out of hose...

  • Page 56: Vent Valve

    STIHL 029, 039 10.2 Vent Valve 10.3 Removing and Installing the Oil Pump Top: Top: Top: Oil filler cap Vent valve Removing the worm Bottom: Bottom: Bottom: Pushing bead of suction Installed position of valve a = Removing suction hose from oil hose into position approx.

  • Page 57: Servicing The Oil Pump

    STIHL 029, 039 10.4 Servicing the Oil Pump 1 = Pump piston 2 = Washer 3 = Helical spring Top: 4 = Washer Top: Removing the oil pump 5 = O-ring 1 = Assembly sleeve 1122 893 4600 1 = Elbow connector...

  • Page 58: Fuel System

    STIHL 029, 039 FUEL SYSTEM 11.1 Air Filter Top: Twist lock on carburetor box cover Bottom: Master Control in 1 = Prefilter "CHOKE" position 2 = Slotted nuts Separating two halves of air filter The air filter's function is to remove any - Pull the air filter off the studs.

  • Page 59: Removing And Installing The Carburetor

    STIHL 029, 039 11.2 Removing and Installing the Carburetor Top: Top: Flanged lock nuts Detaching throttle rod Removing the carburetor Bottom: Bottom: 1 = Fuel hose Detaching throttle rod Removing grommet for adjusting screws - Remove the grommet from the adjusting screws and pull it out of the handle housing.

  • Page 60: Leakage Testing The Carburetor

    STIHL 029, 039 11.3 Leakage Testing the 11.4 Servicing the Carburetor Carburetor Top: Nipple 0000 855 9200 fitted in fuel line 1110 141 8600 Bottom: Pressure testing carburetor with Fuel line on elbow carburetor/crankcase Fastening screw on fuel connector tester 1106 850 2905...
  • Page 61 STIHL 029, 039 Top: Fuel pump end cover with Top: Top: gasket Fuel strainer in carburetor body Metering diaphragm with gasket on end cover Bottom: Bottom: Pump diaphragm on Fastening screws of metering Bottom: carburetor body chamber end cover Separating gasket and diaphragm...
  • Page 62 STIHL 029, 039 Top: Round head screw on control lever spindle (Zama) Bottom: Top: 1 = Round head screw Top: 2 = Inlet control lever Damaged inlet needle Pressing out valve jet (Walbro) 3 = Spindle 4 = Helical spring...
  • Page 63 STIHL 029, 039 Top: Sealing plate (Zama) Removing the fixed jet 1 = Retaining ring 2 = Fixed jet Bottom: Correct position of inlet Sealing plug (Walbro) 3 = O-ring control lever - The Walbro carburetor is equipped - Fit the inlet needle and the helical with a fixed jet.
  • Page 64 STIHL 029, 039 Top: Elbow connectors Top: Top: Locating pegs on body E-clip Bottom: Throttle shutter Bottom: Bottom: fastening screw Locating pegs on cover Withdrawing throttle shaft Note: Fit the end cover so that the - Fit the gasket, metering dia-...
  • Page 65 STIHL 029, 039 Top: Correct position of torsion spring Top: (Zama) Fitting throttle shutter Top: Withdrawing choke shaft Bottom: Bottom: Correct position of torsion spring Choke shutter fastening Bottom: Removing the torsion spring (Walbro) screw - After fitting the throttle shaft,...

  • Page 66: Carburetor Adjustment

    STIHL 029, 039 11.5 Carburetor Adjustment Top: Fitting choke shutter (Zama) 1 = Large bore Top: Correct position of torsion spring 2 = Small bore (Zama) Bottom: Bottom: Fitting choke shutter (Walbro) 1 = High speed adjusting screw 1 = Round notch...
  • Page 67 STIHL 029, 039 If the saw is used at high altitudes Chain runs while engine is idling Corrections to high speed adjusting Turn the idle speed adjusting screw (mountains) or near sea level: screw: (LA) counterclockwise until the chain The setting of the high speed adjusting A slight correction may be necessary.

  • Page 68: Automatic Choke

    STIHL 029, 039 11.6. Automatic Choke 11.6.1 Description of Operation Schematic 1 = Control valve 2 = Bellows 3 = Choke shutter 4 = Sintered polymer and foam filter A = Variable cross section The bellows are located in the handle housing.

  • Page 69: 11.6.2 Troubleshooting Chart

    STIHL 029, 039 11.6.2 Troubleshooting Chart Start machine in normal way Does Troubleshooting, engine see 2.3 and 2.6 run? idle in order? Adjust carburetor - see 11.5 Replace hose/connector to control valve Bypass the control valve, idle in idle in see 11.6.4...

  • Page 70: Testing Automatic Choke

    STIHL 029, 039 11.6.3 Testing Automatic Choke 11.6.4 Leakage Testing Engine Housing and Control Valve Air inlet hose on bellows - Remove the air filter – Control valve temperature see 11.1.1 or 11.1.2. between +5°C (40°F) and +25°C (77°F): - Pull the terminal off the spark plug.

  • Page 71: Testing Control Valve (Removed From Machine)

    STIHL 029, 039 11.6.5 Testing Control Valve (removed from machine) Top: 1 = Air inlet nipple 2 = Air outlet nipple 3 = Connector on cylinder Top: Fastening screw on filter box Bottom: 1 = Nipple 0000 855 9200 with...

  • Page 72: Leakage Testing The Bellows

    STIHL 029, 039 11.6.6 Leakage Testing the 11.6.7 Foam Filter/Polymer Bellows Sintered Filter Top: Nipple 0000 855 9200 Top: connected to fuel line Removing the foam 1110 141 8600 filter Bottom: Testing bellows for leaks with Bottom: Fuel line connected to...

  • Page 73: Removing And Installing The Carburetor

    STIHL 029, 039 11.6.8 Removing and Installing 11.6.9 Removing and Installing the Carburetor Lever System on Carburetor Top: Disconnecting throttle rod from throttle shaft Bottom: Removing bellows from 1 = Arm on choke lever choke lever 2 = Hook on throttle rod Removing bell crank "G"...
  • Page 74 STIHL 029, 039 Top: Levers "A" and "B" joined by link "C" Top: Top: Fitting levers "A" and "B" Fitting bell crank "G" Bottom: D = Torsion spring Bottom: Bottom: E = Throttle shaft Rotating lever "B" Pressing home bell crank "G"...
  • Page 75 STIHL 029, 039 Top: Backing off the idle speed adjusting screw Top: Fitting lever "H" Bottom: Turning lever "A" and Bottom: Correct positions of choke opening choke shutter Pressing lever "H" into position and throttle shutters Checking installed positions of...

  • Page 76: Throttle Shaft/Choke Shaft

    STIHL 029, 039 11.6.10 Throttle Shaft/ Choke Shaft Top: Top: Withdrawing the choke shaft Attaching torsion spring to lever "H" Bottom: 1 = Torsion spring Bottom: 2 = Choke lever Attaching torsion spring Correct positions of levers 3 = Torsion spring "A"...

  • Page 77: Hose/Connector

    STIHL 029, 039 11.6.11 Hose/Connector 11.6.12 Control Valve Top: Top: Hose on control valve Top: Removing the O-ring Cover mounting screws Bottom: Bottom: 1 = Connector Bottom: 1 = Hose 2 = Hose Removing the clip 2 = Control valve - Remove the handle housing –...

  • Page 78: Bellows

    STIHL 029, 039 11.6.13 Bellows Top: Top: Retainer Withdrawing the stub 1 =Collar Bottom: Bottom: 2 = Bellows Installing the O-ring O-ring 3 = Nipple - Remove the carburetor – see 11.6.8. - Use a blunt tool to pry the bellows out of the hole in the handle housing.

  • Page 79: Tank Vent

    STIHL 029, 039 11.7 Tank Vent 11.8 Fuel Pickup Body and Fuel Hose Top: 1 = Grub screw 2 = Vent hose Bottom: Correct positions of grub screws a = Removing tank vent approx. 18 mm (11 /16") Assembly hook 5910 893 8800...

  • Page 80: Replacing The Fueltank

    STIHL 029, 039 11.9 Replacing the Fuel Tank 1 = Spiked bumper 2 = Collar stud 3 = Valve Top: Top: 4 = Bumper strip Withdrawing the pickup body Removing suction hose 5 = Rubber buffer 6 = Mounting screw...
  • Page 81 STIHL 029, 039 Top: Ignition module Top: Top: Bottom: Tank vent 1 = Ground wire O-ring 2 = Short circuit wire Bottom: 3 = Ignition lead Bottom: Fitting annular buffer 4 = Grommet Removing the plug 1 = Groove - Remove O-ring from nipple of oil - Remove the ignition module –...

  • Page 82: Special Servicing Tools And Aids

    STIHL 029, 039 Special Servicing Tools and Aids 12.1 Special Servicing Tools Part Name Part No. Application Locking strip 0000 893 5902 Blocking the crankshaft Clamping strap 1127 893 2600 Compressing piston rings Puller 0000 890 4400 Removing oil seals - Jaws (No.

  • Page 83: Servicing Aids

    STIHL 029, 039 12.2 Servicing Aids Application Part Name Part No. Oil seals, oil pump drive, chain Lubricating grease 0781 120 1111 sprocket bearing Throttle and choke shutter High-strength 0786 111 1109 and fastening screws, threadlocking (Loctite 270) sealing plate and plug...

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