Stihl MS 880, Manual

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1 MS 780, MS 880
q
© ANDREAS STIHL AG & Co. KG, 2009
RA_550
_00_01_02
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