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MS 780, MS 880

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© ANDREAS STIHL AG & Co. KG, 2009

RA_550

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1.

Introduction  

3

2.

Safety Precautions 

 5

3.

Specifications  

6

3.1

Engine  

6

3.2

Fuel System 

 6

3.3

Ignition System 

 6

3.4

Chain Lubrication 

 6

3.5

Tightening Torquese 

 7

4.

Troubleshooting  

9

4.1

Clutch  

9

4.2

Chain Drive, Chain Brake, 
Chain Tensioner 

 10

4.3

Chain Lubrication 

 11

4.4

Rewind Starter 

 12

4.5

Ignition System 

 13

4.6

Carburetor  

15

4.7

Engine  

18

5.

Saw Chain / 
Guide Bar 

 19

5.1

Spiked Bumper / Chain 
Catcher  

19

6.

Clutch  

20

6.1

Clutch Drum 

 22

7.

Chain Brake 

 23

7.1

Checking Operation 

 23

7.2

Removing and Installing 
the Brake Band 

 23

7.3

Brake Lever 

 25

7.4

Cam Lever 

 26

7.5

Pins  

27

7.6

Chain Tensioner 

 28

7.7

Bar Mounting Studs 

 29

8.

Engine  

30

8.1

Muffler with Spring Clip/
Spark Arresting 
Screen  

30

8.2

Screw Mounted Muffler / 
Spark Arresting 
Screen  

32

8.3

Leakage Test 

 34

8.3.1

Preparations  

34

8.3.2

Vacuum Test 

 36

8.3.3

Pressure Test 

 36

8.4

Oil Seals 

 37

8.5

Carburetor Box Cover   38

8.6

Removing and Installing 
the Shroud 

 39

8.7

Cylinder  

40

8.8

Crankshaft  

43

8.8.1

Removing and 
Installing  

43

8.8.2

Bearings / Crankcase   48

8.9

Piston  

50

8.9.1

Removal  

50

8.9.2

Installing  

51

8.10

Piston Rings 

 52

8.11

Decompression Valve   53

9.

Ignition System 

 54

9.1

Ignition Timing 

 54

9.2

Ignition Module 

 54

9.2.1

Removing and Installing 
– Version with two 
mounting screws 

 54

9.2.2

Removing and Installing 
– Version with three 
mounting screws 

 56

9.3

Testing the Ignition 
Module  

59

9.4

Spark Plug Boot / 
Ignition Lead 

 60

9.5

Flywheel  

61

9.6

Short Circuit Wire 

 63

9.6.1

Testing  

63

9.6.2

Removing and Installing
– Version with three 
mounting screws 

 63

9.6.3

Removing and Installing
– Version with cable 
channel  

66

9.6.4

Ground Wire 

 68

9.6.5

Contact Spring 

 69

9.7

Ignition System 
Troubleshooting  

70

10.

Rewind Starter 

 73

10.1

General  

73

10.2

– Removing and 
Installing  

73

10.3

Pawls  

74

10.4

Rope Rotor 

 74

10.5

Starter Rope / Grip 

 75

10.6

Tensioning the Rewind 
Spring  

77

10.7

Replacing the Rewind 
Spring  

77

11.

Servicing the 
AV System 

 79

11.1

Annular Buffer on Oil 
Tank at Clutch Side 

 79

11.2

Annular Buffer on Oil 
Tank at Ignition Side   80

11.3

Annular Buffer at 
Clutch Side 

 80

11.4

Annular Buffer at 
Ignition Side 

 81

11.5

Stop Buffer at 
Ignition Side 

 81

11.6

Stop Buffer on Ignition 
Module  

82

11.7

Stop Buffer at 
Clutch Side 

 82

11.8

Handlebar  

83

12.

Control Levers 

 84

12.1

Switch Shaft 

 84

12.1.1 Removing and 

Installing  

84

12.1.2 Throttle Trigger/

Interlock Lever 

 86

12.1.3 Choke and Throttle 

Rods with Levers 

 87

13.

Chain Lubrication 

 90

13.1

Pickup Body 

 90

13.2

Oil Suction Hose 

 90

13.3

Removing and Installing 
the Oil Pump 

 91

13.3.1 Spur Gear – Removing 

and Installing 

 92

13.4

Valve  

93

Contents

Содержание MS 880

Страница 1: ...STIH STIHL MS 780 880 2009 08...

Страница 2: ...ion Timing 54 9 2 Ignition Module 54 9 2 1 Removing and Installing Version with two mounting screws 54 9 2 2 Removing and Installing Version with three mounting screws 56 9 3 Testing the Ignition Modu...

Страница 3: ...the Carburetor Walbro Carburetor 105 14 6 1 Metering Diaphragm 105 14 6 2 Inlet Needle 106 14 6 3 Fixed Jet 107 14 6 4 Pump Diaphragm 107 14 6 5 Choke Shaft Choke Shutter 108 14 6 6 Throttle Shaft Th...

Страница 4: ...bers to identify the tools in the STIHL Special Tools manual The manual lists all special servicing tools currently available from STIHL Symbols are included in the text and pictures for greater clari...

Страница 5: ...re carrying out repairs or mounting the machine to the assembly stand Always use original STIHL replacement parts They can be identified by the STIHL part number the logo and the STIHL parts symbol K...

Страница 6: ...rmed outdoors only Spilled fuel must be wiped away immediately Always perform leakage test after working on the fuel system and the engine Fuel system hose barb connectors Pull off or push on fuel hos...

Страница 7: ...0 5 bar under vacuum 0 5 bar 0 5 bar 3 2 Fuel System Carburetor leakage test at gauge pressure 0 8 bar Operation of tank vent at gauge pressure 0 5 bar Fuel as in instruction manual 3 3 Ignition Syst...

Страница 8: ...Cover spur gear crankcase 3 0 4 M 10x1 Decompression valve 14 0 Nut M 5 Filter cover twist lock 1 0 Nut M 5 Flange carburetor tank housing 5 0 Screw P 6x32 5 Handlebar right stiffener tank housing 8...

Страница 9: ...0 Spark plug M 14x1 25 Spark plug 25 0 Screw M 5x25 Ignition module crankcase old MS 880 9 0 1 4 Screw M 5x20 Ignition module crankcase 8 0 5 Screw M 6x30 Cylinder crankcase 15 0 4 Remarks 1 Loctite...

Страница 10: ...le speed too high Check carburetor settings and readjust properly if necessary Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Clutch spring hooks broken Replace...

Страница 11: ...n sprocket worn Fit new chain sprocket Saw chain stops under load at full throttle Clutch shoes badly worn Install new clutch Clutch drum badly worn Install new clutch drum Brake band does not release...

Страница 12: ...p body Valve in oil tank blocked Clean or replace valve Spur gear broken Fit new spur gears Oil pump damaged or worn Install new oil pump Machine losing chain oil Oil pump body damaged Install new oil...

Страница 13: ...almost without resistance crankshaft does not turn Guide pegs on pawls or pawls themselves are worn Fit new pawls Spring clip on pawl fatigued Fit new spring clip Spring clip installed wrong Install s...

Страница 14: ...ixture too much oil Use correct mixture of fuel and oil Incorrect air gap between ignition module and flywheel Set air gap correctly Flywheel cracked or damaged or pole shoes have turned blue Install...

Страница 15: ...Install new spark plug Faulty insulation or short in short circuit wire Check short circuit wire for short circuit to ground Break in ignition lead or insulation damaged Check ignition lead and repla...

Страница 16: ...Fit a new metering diaphragm Metered diaphragm deformed Fit a new metering diaphragm Poor acceleration Air filter dirty Clean air filter or replace if necessary Setting of low speed screw too lean Che...

Страница 17: ...ed Clean the carburetor Low speed screw too rich or too lean Reset low speed screw L correctly Setting of idle speed screw LA incorrect throttle shutter completely closed Reset idle speed screw LA cor...

Страница 18: ...in carburetor replace if necessary Leak on fuel hose from tank to carburetor Seal connections or install new fuel hose Setting of high speed screw H too rich Check basic carburetor setting correct if...

Страница 19: ...ver full power or runs erratically Piston rings worn or broken Fit new piston rings Muffler spark arresting screen carbonized Clean the muffler inlet and exhaust replace spark arresting screen replace...

Страница 20: ...ip arrow Pull off the roller 1 1 2 3 165RA002 TG 1 216RA001 TG Hold the guide lug 1 steady and unscrew the nut 2 Unscrew the nuts arrows Remove the spiked bumper 3 Always use new self locking nuts Rea...

Страница 21: ...BUY NOW Then Instant Download the Complete Manual Thank you very much...

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