Stihl MS 270 User Manual
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Stihl MS 270 User Manual

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Table of Contents

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See also: Instruction Manual
Contents
1
2
3
Specifications
3.1
3.2
3.3
3.4
Chain Lubrication
3.5
Tightening Torques
4
Troubleshooting
Chart
4.1
Clutch, Chain Drive,
4.2
4.3
Chain Lubrication
4.4
4.5
4.6
5
Clutch, Chain Drive,
Chain Brake and
5.1
Clutch Drum/Chain
5.2
Replacing the Chain
5.3
5.4
5.4.1
Checking Operation
5.4.2
5.4.3
5.5
5.5.1
5.5.2
Installing
5.5.3
Checking Play
5.5.4
Adjusting Play
5.5.5
Brake Cable
5.5.6
5.6
Pin
5.7
5.8
MS 270, MS 280
3
6
Engine
6.1
4
6.2
6.2.1
5
6.2.2
6.2.3
5
6.3
5
6.4
Shroud
5
6.5
5
6.5.1
6
6.5.2
6.6
6.7
6.7.1
8
6.8
7
8
10
7.1
11
7.1.1
12
7.1.2
13
16
7.1.3
Coil
7.2
7.3
7.4
17
7.5
7.6
Ignition System
17
18
18
8
20
20
8.1
General
21
8.2
23
8.3
Pawls
8.4
25
8.5
8.5.1
25
26
8.5.2
28
8.6
29
Bush
29
8.7
30
30
31
32
33
9
9.1
33
9.2
33
33
9.2.1
34
9.2.2
35
9.3
36
37
38
10
38
39
42
10.1
43
10.2
43
44
45
45
11
45
11.1
46
11.2
48
11.3
11.4
48
11.5
49
50
12
51
12.1
12.2
54
54
54
12.3
54
55
56
57
57
58
12.4
59
12.5
12.6
12.7
q
© 2002 Andreas Stihl AG & Co., Waiblingen
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63
64
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65
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67
67
68
69
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71
71
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73
73
74
75
76
77
79
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81
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82
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  • Page 1: Table Of Contents

    Replacing the Rewind 12.4.1 Standard Setting 5.5.6 Checking Operation Spring 12.5 Tank Vent of Coasting Brake 12.6 Pickup Body Brake Spring Anchor 12.7 Fuel Hose Chain Tensioner Bar Mounting Studs © 2002 Andreas Stihl AG & Co., Waiblingen MS 270, MS 280...
  • Page 2 Contents Special Servicing Tools Servicing Aids MS 270, MS 280...

  • Page 3: Introduction

    "Special Servicing Tools" of this procedures for this power tool. manual. Use the part numbers to identify the tools in the "STIHL You should make use of the Special Tools" manual. illustrated parts lists while carrying The manual lists all special out repair work.

  • Page 4: Safety Precautions

    Warning! Do not smoke or bring any fire, flame or other source of heat near the fuel. All work with fuel must be performed outdoors only. Spilled fuel must be wiped away immediately. MS 270, MS 280...

  • Page 5: Engine

    Spark plug (resistor type): NGK BPMR 7A NGK BPMR 7A Electrode gap: 0.5 mm 0.5 mm Chain Lubrication Fully automatic speed-controlled oil pump with rotary piston Oil delivery rate: 10 cc/min at 10,000 rpm 10 cc/min at 10,000 rpm MS 270, MS 280...

  • Page 6: Tensioner

    4) Only machines with QuickStop Super 5) Secure screw with Loctite 270 6) With quick chain adjuster 7) Only machines without quick chain adjuster 8) Without quick chain adjuster 9) Only muffler with spark arresting screen MS 270, MS 280...
  • Page 7 This procedure ensures that the screw engages properly in the existing thread and does not form a new thread, which would weaken the assembly. Power screwdriver speed setting for polymer: – P screws: max. 500 rpm MS 270, MS 280...

  • Page 8: Chain Brake

    Fit new needle cage Clutch shoe retainer broken Fit new retainer Clutch shoes and carrier worn Install new clutch Chain sprocket wears rapidly Chain not properly tensioned Tension chain as specified Wrong chain pitch Fit chain of correct pitch MS 270, MS 280...
  • Page 9 Condition Cause Remedy Saw chain does not stop Brake spring stretched or broken Fit new brake spring immediately when brake is activated Brake band stretched/worn/broken Fit new brake band MS 270, MS 280...

  • Page 10: Rewind Starter

    Lubricating oil on rewind spring Apply a few drops of kerosine becomes viscous at very low (paraffin) to spring, then pull rope outside temperatures (spring carefully several times until normal windings stick together) action is restored MS 270, MS 280...
  • Page 11 Clean oil inlet hole blocked Intake hose or pickup body Wash intake hose and pickup body (strainer) clogged or intake hose (strainer) in fresh STIHL cleaner or ruptured replace if necessary Valve in oil tank blocked Clean or replace valve...

  • Page 12: Ignition System

    Check operation of spark plug. Clean or replace spark plug, Inspect Master Control lever, replace faulty parts of ignition ignition coil/lead for damage system insulation and leakage current No ignition spark Check operation of Master Control lever and ignition module MS 270, MS 280...

  • Page 13: Carburetor

    (relative to correct installed edge of housing position) Inlet needle sticking to valve seat Remove inlet needle, clean and refit Diaphragm gasket leaking Fit a new diaphragm gasket Metering diaphragm damaged or Fit a new metering diaphragm shrunk MS 270, MS 280...
  • Page 14 Throttle shutter not opened fully Check linkage Engine will not idle, Throttle shutter opened too wide Reset idle speed screw (LA) idle speed too high by idle speed screw (LA) correctly Engine leaking Seal the engine MS 270, MS 280...
  • Page 15 Set low speed screw (L) correctly Setting of idle speed (LA) Set idle speed screw (LA) correctly incorrect – throttle shutter completely closed Small plastic plate in valve jet Clean or renew valve jet does not close MS 270, MS 280...

  • Page 16: Engine

    Decompression valve sticking Replace the decompression valve Engine overheating Insufficient cylinder cooling. Air Thoroughly clean all cooling air inlets in fan housing blocked or openings and the cylinder fins cooling fins on cylinder very dirty MS 270, MS 280...

  • Page 17: Sprocket

    (1) with needle – 5.4.2. cage (2).  Remove the E-clip (1),  Pull off the chain sprocket (1) or washer (2) and, if fitted, the rim clutch drum (2). sprocket (3). – Remove the needle cage. MS 270, MS 280...

  • Page 18: Catcher

    (see arrow).  Release the twist lock (1) and lift away the carburetor box cover (2).  Remove the spark plug boot (1). – Unscrew the spark plug. MS 270, MS 280...
  • Page 19  Take the cover washer (1) off the – Close the decompression valve, – Clean all parts with STIHL if fitted. crankshaft stub. cleaner –  Push the locking strip (1) – Replace any damaged parts. 0000 893 5903 into the spark plug hole so that "OBEN-TOP"...

  • Page 20: Chain Brake

    – Screw home spark plug and deceleration of the saw chain is tighten it down – 3.5. imperceptible to the eye. – Fit boot on the spark plug. – Fit the shroud. – Install clutch drum/chain sprocket – 5.1. MS 270, MS 280...

  • Page 21: Removing

    (2).  Disconnect the brake band from – Engage the chain brake by the bell crank (2). pushing the hand guard away from the front handle.  Take out the screw (arrow). MS 270, MS 280...
  • Page 22  Carefully pry the hand guard (1) and bell crank (2) off their pivot pins and remove them together.  Pull the bell crank out of the hand guard.  Take out the screw (1) together with the bushing (2). MS 270, MS 280...

  • Page 23: Installing

     Press the cam lever (3) slightly downward and push the hand guard and bell crank onto their pivot pins. – Tighten down the hand guard mounting screw – 3.5.  Attach spring (1) to pivot pin (2) and cam lever (3). MS 270, MS 280...
  • Page 24 – Fit the bar, chain and chain sprocket cover. Tighten down nuts on the chain sprocket cover – 3.5. – Check operation of chain brake – 5.4.1.  Hook the brake spring to the bell crank (arrow). MS 270, MS 280...

  • Page 25: Removing

    (2).  Remove the cover (1).  Remove the bushing (2). – Pull the brake lever out of the – Relieve tension of brake spring hand guard. by pushing hand guard forward. MS 270, MS 280...
  • Page 26 – 3.5. Coat all sliding and bearing points with STIHL multipurpose grease – 14. Do not lubricate the brake band.  Push the lever into the side of the hand guard. MS 270, MS 280...
  • Page 27 (3) and then push it into the slot in the crankcase.  Install screw (1) with Loctite 243 and tighten it down firmly – 3.5.  Hook the brake spring (1) to the brake lever (2). MS 270, MS 280...
  • Page 28 (A) in the crankcase.  Take out the screws (3) and remove the cover (4).  The brake cable (1) must hang loosely in the crankcase when the brake is disengaged. MS 270, MS 280...
  • Page 29 10.1, if it gets in the way of adjustments. Reassemble in the reverse sequence.  Pull the cable (1) out of the tank housing in the direction of the cylinder. – Remove the brake spring – 5.5.1. MS 270, MS 280...

  • Page 30: Checking Operation Spring

     Use a suitable punch to drive the – Remove the parts concerned and anchor pin (1) out of the clean in STIHL cleaner – crankcase in the direction of the arrow. – Replace worn or damaged parts.

  • Page 31: Chain Tensioner

    – Fit the fan cover – 8.2. – Fit the shroud – 6.4.  Pull out the retainer (1).  Take out the tensioner slide with adjusting screw and thrust pad.  Take out the screw (2). MS 270, MS 280...

  • Page 32: Bar Mounting Studs

    Before installing, coat thread of collar stud with Loctite 270 – – Machines without quick chain adjuster: Before installing, coat thread of collar stud with Loctite 243 – – Install and tighten down the collar studs – 3.5. MS 270, MS 280...

  • Page 33: Muffler/Spark

    (2).  Inspect spark arresting screen (2) for damage, clean or replace if necessary. Reassemble in the reverse sequence.  Remove the heat shield (1) from the muffler (2). MS 270, MS 280...

  • Page 34: Pressure Test

    – Remove the carburetor 1106 850 2905 to nipple on test – 12.2.1. flange (arrow). – Set the piston to top dead center (T.D.C.).  Check that the sleeve (1) and washer (2) are in place. MS 270, MS 280...

  • Page 35: Vacuum Test

     Connect suction hose (arrow) of vacuum pump 0000 850 3501 to nipple of test flange.  Close the vent screw (1) on the pump.  Operate lever (2) until the pressure gauge (3) indicates a vacuum of 0.4 bar. MS 270, MS 280...

  • Page 36: Oil Seals

    Oil Seals It is not necessary to disassemble – Clean sealing face with STIHL – Install the flywheel – 7.3. the complete crankcase to replace cleaner – the oil seals. – Fit the fan cover – 8.2. – Lubricate sealing lip of oil seal Flywheel side with grease –...
  • Page 37 1118 893 2405 to install the oil seal. Take care not to damage the crankshaft stub. – Remove the installing sleeve. – Clean sealing face with STIHL – Wait about one minute, then cleaner – rotate the crankshaft several times.

  • Page 38: Cylinder And Piston

    (2).  Pull the manifold (2) off the intake Disconnect the short circuit wire (3) and take the wires out of port. the guide (arrow). – Inspect the cylinder for damage and replace it if necessary. MS 270, MS 280...

  • Page 39: Installing

     Lubricate the needle cage (2) Wear safety glasses to protect end (needle cage) and line up the your eyes when working with snap with oil and fit it in the small end. piston. rings. MS 270, MS 280...
  • Page 40 (2) so that the snap ring downward, on a flat surface gap is on the flat side of the tool's (wooden board) and press shank. vertically downwards until the sleeve butts against the tool's shoulder. MS 270, MS 280...
  • Page 41 (arrows) in the piston grooves. The manifold flange is pulled upward. through the tank housing intake opening without damaging the manifold. MS 270, MS 280...

  • Page 42: Piston Rings

     Install and tighten down the  Install the new piston rings in the decompression valve (1) firmly grooves so that the radii at the (if fitted) – 3.5. ends of the rings face upward. – Install the piston – 6.5.2. MS 270, MS 280...

  • Page 43: Crankcase

    If the crankshaft has to be replaced, remove the piston – 6.5.1.  Check the ball bearings (arrows) on crankshaft (1) for damage and replace if necessary. MS 270, MS 280...

  • Page 44: Decompression Valve

    – Coat cylinder with 'Dirko red' before installation – – Fit the carburetor box cover and shroud – 6.4. – Install the cylinder – 6.5.2. The electronic ignition system basically consists of an ignition module (1) and flywheel (2). MS 270, MS 280...

  • Page 45: Ignition Module

     Pull the short circuit wire (1) off the connector tag on the ignition module.  Take out the screws (1) and washers and remove the wires from the guide (arrow). – Remove the ignition module. MS 270, MS 280...

  • Page 46: Testing The Ignition

    (1). Push the tester’s output terminal (3) onto the spark plug. – Crank the engine quickly with the rewind starter (min. 1,000 rpm) and check spark in the tester’s window (2). MS 270, MS 280...
  • Page 47 The engine may start and Using ZAT 3 ignition tester accelerate during the test. 5910 850 4520 It is necessary to use the ZAT 3 ignition system tester 5910 850 4520 to test the auxiliary spark gap. MS 270, MS 280...

  • Page 48: Spark Plug Boot

    (see arrow). Reassemble in the reverse sequence. If the flywheel cannot be removed by hand, screw on the puller (1) 4133 893 0800 and tap its end to release the flywheel. MS 270, MS 280...

  • Page 49: Short Circuit Wire

    – 8.2. Degrease crankshaft stub and bore – Remove the shroud – 6.4. in flywheel with STIHL cleaner – – Remove the air filter/filter base – 12.1. – Fit the flywheel in position. Check position of slot.

  • Page 50: Stop Contact

    Replace the contact spring as follows:  Pull the wire (1) off the contact spring (2).  Pry the contact spring (2) out of the retaining clip (3) and remove it. Reassemble in the reverse sequence. MS 270, MS 280...

  • Page 51: Troubleshooting

    – Leg spring hook in center of ignition lead? – Boot damaged? If necessary, install new spark plug boot and/or leg spring Test ignition system with ZAT 3 or ZAT 4 (use ZAT 3 as main spark gap – see TI 32.94) MS 270, MS 280...
  • Page 52 – Spark plug boot: Holes/cracks? – Resistance: spark plug boot to ground: spec. 1.5 – 12k Ω – Check resistance of ignition lead: spec. < 10 Ω, If necessary, install new spark plug boot and/or ignition lead MS 270, MS 280...
  • Page 53 Install new ignition module Engine runs Check ON/STOP function Look for fault in fuel system on Master Control lever/ or carburetor, slide contro check engine for leaks, or separate stop switch check position of flywheel on crankshaft MS 270, MS 280...

  • Page 54: Rewind Starter

    If clogged with dirt or pitch, the entire starter mechanism, including the rewind spring, must be removed and disassembled – Wash all parts in STIHL cleaner – Lubricate the rewind spring and starter post with STIHL special lubricant, 14, before installing.

  • Page 55: Rope Rotor

     Fit the rotor on the starter post carefully remove the spring so that the lug (1) on the rope clip (1) from the starter post. rotor slips behind the inner spring loop (2). – Tension the rewind spring – 8.5.2. MS 270, MS 280...

  • Page 56: Starter Rope

    Then pull the worn rope out of the starter grip, fan cover and rotor.  Thread the other end of the rope, from outside, through the guide bush in the fan housing. MS 270, MS 280...

  • Page 57: Elastostart

    – 8.5.2. – Fit fan cover with rewind starter – 8.2.  Pull starter rope and, if necessary, the spring element (2) out of the grip (1).  Undo the knot (arrow) in the starter rope. MS 270, MS 280...

  • Page 58: Starter Rope Guide

     Pull knot (1) out of recess (2) in – Fit the fan cover – 8.2. the rope rotor. – Undo the knot.  Pull starter rope out of the rope rotor and guide bush. MS 270, MS 280...

  • Page 59: Replacing The Rewind

     Thread the starter rope through installing tool 0000 890 2201 the guide bush from outside and through the bush from inside the fit it on the rope rotor – 8.5. fan cover. – Install the rope rotor – 8.4. MS 270, MS 280...

  • Page 60: Av Handle System

     Fit the rewind spring in the Installing counterclockwise direction, – Lubricate the spring with a few starting from outside and working drops of STIHL special lubricant inwards. before installation – – Fit the spring housing in the fan – Position replacement spring with housing and press the spring frame in the fan cover.

  • Page 61: Replacing Annular

     Use the screw to pull out the to expose the annular buffer. bushing (1). – Pry the annular buffer out of the – Take the screw out of the handlebar. bushing. Reassemble in the reverse sequence. MS 270, MS 280...

  • Page 62: Tank Housing

    – Push the bushings, flat end first, home as far as stop. Reassemble all other parts in the reverse sequence.  Fit an M6 screw (1) in the bushing in the annular buffer (2). MS 270, MS 280...

  • Page 63: Spring

    If the spring is too tight on the bearing plug, proceed as follows:  When installing the spring, make sure the end of the spring coil butts against the stop (arrow) on the tank housing. MS 270, MS 280...

  • Page 64: Master Control

    Reassemble all other parts in the reverse sequence.  Pry the switch shaft (1) out of the tank housing (2).  Carefully pull the switch shaft (1) out of the pivot mount (3). MS 270, MS 280...

  • Page 65: Throttle Trigger/Interlock Lever

     Press the throttle trigger (2) up with torsion spring (1). and the switch shaft (3) to "Choke" position. Install in the reverse sequence. – Move the switch shaft to the normal operating position.  Pull out the interlock lever (1). MS 270, MS 280...

  • Page 66: 10.2.2 Machines With

     Disconnect brake cable (1) from needle roller (2) out of the switch lever (2). interlock lever (1). Remove the interlock lever. – Use a 3 mm drift to drive the needle roller out of the switch lever. MS 270, MS 280...

  • Page 67: Chain Lubrication

    The long arm – 5.2. points toward the carburetor.  Pull the pickup body (1) off the suction hose (2). – Inspect the pickup body for damage and dirt and replace if necessary. MS 270, MS 280...

  • Page 68: Delivery Hose

    – Engage the chain brake by  Coat grommet (1) on suction pushing the hand guard away hose with a little oil. from the front handle.  Insert suction hose, pickup body first, in the crankcase. MS 270, MS 280...

  • Page 69: Valve

    Reassemble all other parts in the reverse sequence.  Use a 7 mm diameter drift to carefully push home the valve until it is about 1 mm below the housing face ('a' in illustration). Reassemble in the reverse sequence. MS 270, MS 280...

  • Page 70: Oil Pump

    (arrows).  Remove the fan housing (1).  If necessary, remove the drive  Inspect fan housing gasket (1) spring from the worm. and replace if necessary. Install in the reverse sequence. MS 270, MS 280...

  • Page 71: Fuel System

    Fuel System 12.1 Air Filter Dirty air filters reduce engine power, Wash air filter thoroughly in STIHL increase fuel consumption and cleaner – 14. Replace a make starting more difficult. damaged air filter. The air filter should be cleaned when there is a noticeable loss of engine power.

  • Page 72: Carburetor

    (2) are in position. Reassemble in the reverse sequence.  Use a screwdriver to press the throttle shaft down and disconnect the throttle rod.  Pull the hose (1) off the carburetor. – Remove the carburetor. MS 270, MS 280...

  • Page 73: 12.2.2 Leakage Test

     Disconnect fuel hose (1) from the  Remove the metering diaphragm carburetor. and gasket (arrow) from the carburetor body or end cover. – Push the fuel line with nipple onto the carburetor’s elbow connector. MS 270, MS 280...

  • Page 74: 12.3.2 Inlet Needle

    Reassemble all other parts in the reverse sequence.  If there is an annular indentation on the sealing cone of the inlet needle, it will be necessary to replace the inlet needle because it will no longer seal properly. MS 270, MS 280...

  • Page 75: 12.3.3 Fixed Jet

    – Press the inlet control lever down and secure it with the screw. Make sure the helical spring locates on the control lever’s nipple. – Check that inlet control lever moves freely. MS 270, MS 280...

  • Page 76: 12.3.4 Pump Diaphragm

    Install in the reverse sequence.  Carefully separate the diaphragm and gasket. – Inspect diaphragm for damage and wear, install a new gasket. MS 270, MS 280...

  • Page 77: 12.3.5 Accelerator Pump

    (1) down and fit the throttle shaft is removed. shaft. Wear safety glasses. – Pull the throttle shaft out of the carburetor body.  Take the screw (1) out of the throttle shutter. MS 270, MS 280...
  • Page 78 The two marks (see arrows) must be parallel to the throttle shaft.  Press home sealing plug so that it is recessed 1 mm (dimension 'a') in the accelerator pump’s bore. MS 270, MS 280...

  • Page 79: Adjusting

    – Set the low speed screw (L) so it is one quarter turn open. – Turn the idle speed screw (LA) clockwise until the saw chain begins to move. Then turn it back one full turn. MS 270, MS 280...

  • Page 80: 12.4.1 Standard Setting

    3,700 rpm, abort the procedure and limiter cap lugs are in line with the start again with step 1. carburetor openings. On MS 270, make the following adjustment: 3. Use the idle speed screw (LA)  Turn the right-hand limiter cap (2)

  • Page 81: Tank Vent

    – Reassemble in the reverse sequence. – Disconnect the fuel hose (1) from the carburetor.  Connect vacuum pump (1) 0000 850 3501 to fuel hose (2) and subject fuel tank to vacuum. MS 270, MS 280...

  • Page 82: Pickup Body

    Reassemble all other parts in the reverse sequence. – Open the tank again and drain it. Dispose of fuel properly.  Pull the pickup body off the fuel hose. – Fit a new pickup body. Install in the reverse sequence. MS 270, MS 280...
  • Page 83 0.5 – 18 Nm (0.4 – 13.5 lbf.ft) Alternative: Torque wrench 5910 890 0302 with optical/acoustic signal Torque wrench 5910 890 0311 6 – 80 Nm (4.4 – 60 lbf.ft) Alternative: Torque wrench 5910 890 0312 with optical/acoustic signal MS 270, MS 280...
  • Page 84 Crankcase, oil seals (outside) STIHL cleaner Crankshaft stubs Graphite grease Pegs on pawls Molykote grease Sliding and bearing points of brake band Medium-strength threadlocking 0786 110 0101 adhesive (Loctite 243) High-strength threadlocking 0786 111 1109 adhesive (Loctite 270) MS 270, MS 280...

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Ms 280

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