Stihl 4137 Series Manual
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Stihl 4137 Series Manual

Stihl 4137 Series Manual

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STIH)
STIHL Series 4137 Components
HT
2005-04

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Summary of Contents for Stihl 4137 Series

  • Page 1 STIH) STIHL Series 4137 Components 2005-04...

  • Page 2: Table Of Contents

    Carburetor with Repair LD Screw 9.4.3 User Adjustment, Carburetor with Limiter Cap 9.4.4 Service Adjustment, Carburetor with Limiter Cap Tank Vent Pickup Body Fuel Tank/Fuel Hoses 45 © ANDREAS STIHL AG & Co. KG, 2005 Series 4137 Components - HT...

  • Page 3: Introduction

    Servicing Tools" of this manual. based on the series 4137 Use the part numbers to identify the powerhead. tools in the "STIHL Special Tools” manual. The manual lists all special If there is no specific reference to servicing tools currently available individual machines, the procedure from STIHL.

  • Page 4: Safety

    Safety If the engine is started up in the course of repairs or maintenance work, observe all local and country- specific safety regulations as well as the safety precautions and warnings in the instruction manual. Gasoline is an extremely flammable fuel and can be explosive in certain conditions.

  • Page 5: Specifications

    Diaphragm carburetor Carburetor leakage test at gauge pressure: 80 kPa (0.8 bar) Fuel mixture: Regular brand-name gasoline (min. 90 RON) with STIHL 50:1 two-stroke engine oil; see instruction manual for further details Rated idle speed: 2,800 rpm Rated cut-off speed:...

  • Page 6: Tightening Torques

    Tightening Torques DG and P (Plastoform) screws are used in polymer and light metal components. These screws form a permanent thread when they are installed for the first time. They can be removed and installed as often as necessary without impairing the strength of the screwed assembly, providing the specified tightening torque is observed.
  • Page 7 Use the following procedure when refitting a DG or P screw in an existing thread: Place the screw in the hole and rotate it counterclockwise until it drops down slightly. Tighten the screw clockwise to the specified torque. This procedure ensures that the screw engages properly in the existing thread and does not form a new thread and weaken the assembly.

  • Page 8: Troubleshooting

    Troubleshooting Clutch, Chain Drive, Chain Tensioner Condition Cause Remedy Chain stops under load at full Clutch shoes badly worn Install new clutch shoes or a new throttle clutch Clutch drum badly worn Install new clutch drum Chain rotates at idle speed Engine idle speed too high Readjust with idle speed screw (counterclockwise)

  • Page 9: Rewind Starter

    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 Spring overtensioned – no reserve Fit new rewind spring (rope does not rewind) when rope is fully extended...

  • Page 10: Fuel System

    Fuel System Condition Cause Remedy Engine stalls at idle speed Idle jet bores or ports blocked Clean jet bores and ports and blow clear with compressed air Idle jet too rich Screw home the low speed screw slightly (see Adjusting the Carburetor) Setting of idle speed screw Set idle speed screw...
  • Page 11 Condition Cause Remedy Poor acceleration Idle jet too lean Turn low speed screw (L) counterclockwise (richer), but no further than stop Main jet too lean Turn high speed screw (H) counterclockwise (richer), but no further than stop Inlet control lever too low Set inlet control lever flush with top (relative to correct installed face of carburetor body...

  • Page 12: Engine

    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, stalls Oil seals in crankcase faulty Install new oil seals at idle speed, but operates normally at full throttle...

  • Page 13: Engine

    Engine Clutch Shroud Troubleshooting chart, b 4.1. Removing – Remove the shroud, b 5.1 100% : Remove the screw (arrow) from : If there are noticeable wear the starter. marks on the inside diameter of the clutch drum (1), check its wall thickness.
  • Page 14 : Push the locking strip (1) : Fit the retainers (1) on the clutch – Pull the clutch shoes off the 0000 893 5903 into the cylinder. carrier. shoes so that the narrow side (2) is on the same side as the : Pull the retainers off the clutch number (3).

  • Page 15: Clutch Drum

    Clutch Drum – Remove the rubber element (AV system) from the fan housing, b 7.1 : Attach one end of each spring (1) : Check that the plugs (arrows) are to the clutch shoes. in position in the fan housing, fit them if necessary.

  • Page 16: Muffler/Spark Arresting

    Muffler/Spark Arresting Screen – Bend the tab down again after fitting the gasket. – Tighten down the muffler mounting screws, b 3.2 Install all other parts in the reverse sequence. : Check the ball bearing (arrow). Muffler – Remove the shroud, b 5.1 If the ball bearing is faulty, the whole fan housing has to be replaced.

  • Page 17: Removing And Installing

    Clean all parts, b 12. Lubricate the rewind spring and : On machines with two short : Take the throttle cable out of the starter post with STIHL special lubricant, see b 12, before circuit wires, pull the connectors tensioner.

  • Page 18: Removing And Installing

    Removing and Installing – Remove the shroud, b 5.1 : On machines with one short : Fit the rewind starter so that the circuit wire, remove throttle cable lug (1) engages the plug (2). : On machines with a guard, take lug from lower screw (arrow).

  • Page 19: Rope Rotor/Rewind Spring

    Rope Rotor/Rewind Spring A replacement rope rotor comes The rewind spring may pop out of with a new rewind spring. the rope rotor and uncoil if it is not installed very carefully. Use the – Remove the rewind starter, following procedure to fit the rewind b 6.2 spring: Relieving tension of rewind...

  • Page 20: Tensioning

    Tensioning – Lubricate the bore with STIHL – Hold the starter grip firmly to keep special lubricant, b 12. the rope tensioned. – Fit the rotor on the starter post so – Let go of the rope rotor and that the lug on the rotor engages slowly release the starter rope so the inner spring loop.

  • Page 21: Starter Rope

    Starter Rope Starter Grip – Remove the rewind starter, The ElastoStart starter grip is b 6.2 supplied with starter rope. – Remove the remaining rope from – Remove the rewind starter, b 6.2 the rope rotor if necessary. – Remove the rope rotor, b 6.3 : Pull the rope back so that the knot locates in the starter grip.

  • Page 22: Carrier/Pawl

    Carrier/Pawl : Thread the starter rope through : Take the torsion spring (arrow) off – Unscrew the spark plug and the hole in the side of the rotor. block the piston with the locking the pawl. strip 0000 893 5903, b 5.2 –...

  • Page 23: Av System

    AV System Repair – Screw the carrier onto the On these units the anti-vibration crankshaft and tighten it down connection between the engine and firmly, b 3.2 drive shaft consists of a vibration- damping rubber element installed in – Install the rewind starter, b 6.2 the fan housing.
  • Page 24 AV sleeve. the flange (2) is behind the sleeve. – Coat the rubber element with STIHL Press Fluid OH 723, b 12. : Push the service tool (1) : Loosen the clamp screw (1) and, 4126 893 4900 into the AV if necessary, the fixing screw (2).

  • Page 25: Throttle Control

    Throttle Control Control Handle up to 1997 8.1.1 Throttle Trigger / Interlock Lever To avoid the risk of electrocution, do not start the engine while the control handle is exposed. : Install the retaining ring (gap : Remove the interlock lever from must face clamp screw) so that it the pivot.

  • Page 26: Throttle Trigger

    8.1.2 Detent/Torsion Spring : Disconnect throttle cable nipple : Fit a square washer on both sides – Remove the throttle trigger, b 8.1.1 from the throttle trigger. of the clamps (arrows). : Disconnect the short circuit wires – Pull the throttle trigger off the Secure screws only finger-tight at drive tube.

  • Page 27: Throttle Cable

    8.1.3 Throttle Cable – Remove the throttle trigger, b 8.1.1 – Pull the short circuit wires off the connector tags in the control handle, b 8.1.2 Install in the reverse sequence. : Pull the slide control out of the – Remove the shroud, b 5.1 handle molding.

  • Page 28: Control Handle Up To 2001

    Control Handle up to 2001 8.2.1 Throttle Trigger/Interlock Lever : Disconnect the throttle cable : Remove the contact spring To avoid the risk of electrocution, do not start the engine while the control from the throttle trigger. (arrow) from the interlock lever. handle is exposed.

  • Page 29: Slide Control

    8.2.2 Slide Control 8.2.3 Throttle Cable – Remove the shroud, b 5.1 – Remove the interlock lever, – Tighten down the clamp screws b 8.2.1 firmly, b 3.2 : Take out the screw (1). : Pull the slide control off the : The slot (1) in the slide control : Remove the extended throttle handle molding.

  • Page 30: Control Handle From 2002

    Control Handle from 2002 8.3.1 Throttle Trigger/Interlock Lever : Pull the short circuit wire : Remove the torsion spring. This control handle has a slide (1) connector off the tag on the for automatic adjustment of the ignition module. throttle cable. : Remove the throttle trigger, : Insert a screwdriver in the slot, b 8.2.1...

  • Page 31: Contact/Detent Spring

    8.3.2 Contact/Detent Spring – Make sure the throttle cable and protective tube are correctly positioned. – Tighten down the screws firmly, b 3.2 – Open the throttle wide several times so that the slide automatically takes up any slack in the throttle cable. : Take the slide (1) out of the guide –...

  • Page 32: Throttle Cable

    8.3.3 Throttle Cable : Take out the stop switch (1). – Remove the shroud, b 5.1 : Pull the short circuit wire’s connector (1) off the tag (2). : Disconnect the throttle cable Install in the reverse sequence. : Pull the connector (3) off the nipple (1) from the slotted pin (2) : Position the switch’s wire in the on the carburetor’s throttle lever.

  • Page 33: Adjusting The Throttle Cable

    Adjusting the Throttle Fuel System Cable Air Filter The carburetor’s throttle lever must Dirty air filters reduce engine power, butt against the stop on the increase fuel consumption and carburetor cover when the throttle make starting more difficult. The air trigger is fully depressed (full filter must be cleaned if there is a throttle) and against the idle speed...

  • Page 34: Carburetor

    Carburetor 9.2.1 Leakage Test – Wash the foam filter element in a If you suspect a fault in the fuel system, b 4.3 standard commercial solvent- based degreasant containing no chlorinated or halogenated In the case of problems with the hydrocarbons and dry, b 12.

  • Page 35: Removing And Installing

    9.2.2 Removing and Installing If this pressure remains constant, the carburetor is airtight. However, if it drops, there are two possible causes: The inlet needle is not sealing (foreign matter in valve seat or sealing cone of inlet needle is damaged or the inlet control lever is sticking).

  • Page 36: Spacer Flange

    9.2.3 Spacer Flange : Remove the gasket (arrow). – Remove the carburetor, b 9.2.2 : Remove the screw with bushing or push nut with pin (1). : Take the throttle cable out of the – Remove the spacer flange with gasket, b 9.2.3 : Take the tensioner (2) off the tensioner (arrow).

  • Page 37: Servicing The Carburetor

    Note: STIHL recommends that the flange mounting with an oval end cover be : Take out the M3x8 screws (1). converted to the later version with a square end cover, b 9.3.2 : Remove the flange (2).

  • Page 38: Flange Mounting With Square End Cover

    9.3.2 Flange Mounting with 9.3.3 Metering Diaphragm Square End Cover : Take out the screws (1). : Inspect the metering diaphragm – Remove flange secured with an oval end cover, b 9.3.1 and gasket and replace if : Remove the end cover with cap. necessary, b 9.3.3 –...

  • Page 39: Inlet Needle

    9.3.4 Inlet Needle 9.3.5 Fixed Jet : Fit the gasket (1) on the – Remove the metering – Remove the metering diaphragm, b 9.3.3 diaphragm, b 9.3.3 carburetor body. : Take out the screw (1). Line up the hole in the gasket (2) Take care not to damage the fixed with the compensating bore in the jet with the screwdriver.

  • Page 40: Pump Diaphragm

    9.3.6 Pump Diaphragm Adjusting the Carburetor 9.4.1 Carburetor with Two Adjusting Screws – Inspect the diaphragm and This carburetor has no high speed gasket and replace if necessary. screw (H). The diaphragm is a very delicate The carburetor is tuned so that the component.

  • Page 41: Carburetor With Ld Screw

    9.4.2 Carburetor with LD Screw The carburetor is tuned at the Chain rotates when engine is factory so that the engine receives idling an optimum fuel-air mixture under all operating conditions. – Turn the idle speed screw (LD) counterclockwise until the chain stops running, then turn the Standard setting screw about another one turn in...

  • Page 42: User Adjustment

    9.4.3 User Adjustment, Carburetor with Limiter – At high altitude (mountains): Turn the high speed screw (H) clockwise (leaner), but no further than stop, until there is no noticeable increase in engine speed. It is possible that the standard setting will produce the highest engine rpm.

  • Page 43: Service Adjustment

    9.4.4 Service Adjustment, Carburetor with Limiter Erratic idling behavior The limiter cap has to be removed from the high speed screw (H) only – Idle setting is too rich. Turn the if it is necessary to replace the high low speed screw (L) clockwise speed screw (H), clean the (about a quarter turn) until the carburetor or adjust it from scratch.
  • Page 44 270° – Open the high speed screw (H) Installing short limiter cap Installing long limiter cap 1 1/2 turns counterclockwise. : Line up the new cap for the high : Line up the new cap for the high – Open the low speed screw (L) speed screw (H) against the rich speed screw (H) against the rich one full turn counterclockwise.

  • Page 45: Tank Vent

    Tank Vent Correct operation of the carburetor This pressure must drop gradually. is only possible if atmospheric If it remains constant, the tank vent pressure and internal fuel tank is faulty or needs to be cleaned. pressure are equal at all times. This is ensured by the tank vent.

  • Page 46: Pickup Body

    Pickup Body Fuel Tank/Fuel Hoses The diaphragm pump draws fuel out – Drain the fuel tank. of the tank and into the carburetor via the fuel hose. Any impurities – Remove the rewind starter, b 6.2 mixed with the fuel are retained by the pickup body (filter).
  • Page 47 Pickup body Fuel tank Fuel hoses : Use hook (1) 5910 893 8800 to : Remove the fuel tank. – Unscrew the filler cap and pull the pickup body out of the remove it together with the cap fuel tank. Take care not to over- –...

  • Page 48: Drive Tube

    Install in the reverse sequence. tube. If the drive shaft has turned blue, always install a new one. – Coat the drive shaft with STIHL gear lubricant 0781 120 1109, b 12, before installing it in the drive tube. Apply the lubricant uniformly to the drive shaft.

  • Page 49: Removing And

    10.2 Removing and Installing Drive Tube : The hole (1) must be between the – Remove the drive shaft, – Pull out the drive tube. b 10.1 spokes (2). : Pull the drive tube (1) out of the : Loosen clamp screws (arrows) –...

  • Page 50: Telescopic Drive Tube (Ht 75)

    10.3 Telescopic Drive Tube (HT 75) 10.3.1 Removing and Installing The drive shaft assembly consists of an externally splined shaft supported in ball bearings in the rigid part of the telescopic drive tube and an internally splined shaft supported in a flexible liner and ball bearing in the moving part.
  • Page 51 : Secure the bearing (2) with an be pulled out completely, do not necessary. use excessive force. In such a original STIHL blind rivet (1) : Make sure the 15x1 circlip (3) is case, rotate the drive shaft slowly 9438 003 3171 and carefully until it can be pulled properly seated in the groove.
  • Page 52 : Pull off the clamp (3). alignment. : Pull out the drive tube (4) at the : Secure the bearing (2) with an engine end. original STIHL blind rivet (1) 9438 003 3171 Installing: Check the following components before installing the telescopic drive tube: –...
  • Page 53 : Pull out the short drive tube (2) as : Coat outside of drive shaft (1) with STIHL shaft grease, b 12, far as stop. before pushing it into the flexible : Tighten down the screw (1) firmly.
  • Page 54 Make sure the drive shaft is not pushed out when pushing home the externally splined shaft. : Coat the externally splined shaft – The telescopic drive tube must be completely with STIHL Press completely compressed to Fluid OH 723, b 12, before simplify installation. installing.

  • Page 55: Special Servicing Tools

    Special Servicing Tools Part Name Part No. Application Rem. Locking strip 0000 893 5903 Blocking crankshaft Puller 5910 890 4500 Removing limiter cap on carburetor Hook 5910 893 8800 Removing pickup body Drift 1108 893 4700 Removing and installing clutch drum Hook 5910 890 2800 Detaching springs from clutch shoes,...

  • Page 56: Servicing Aids

    Part No. Application Lubricating grease (225 g tube) 0781 120 1111 Oil seals, oil pump drive, chain sprocket bearing STIHL shaft grease (40 g tube) 0781 120 6602 Drive shaft in flexible liner STIHL special lubricating oil 0781 417 1315...
  • Page 57 Series 4137 Components - HT...
  • Page 58 englisch / english 0455 386 0123. M7. D5. Sä. Printed in Germany...

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