Stihl FC 75, User Manual

Page: 1 / 57

1. Introduction 2
2. Specifications 3
2.1 Engine 3
2.2 Fuel system 3
2.3 Ignition system 4
2.4 Gearbox 4
2.5 Cutting attachment 5
2.6 Special accessories 6
2.6.1 For the user 6
2.6.2 For service 6
2.7 Tightening torques 7
3. Clutch 9
3.1 Disassembly 9
3.2 Assembly 10
4. Engine 11
4.1 Muffler / spark arresting
screen
11
4.2 Leakage testing 11
4.2.1 Preparations 12
4.2.2 Pressure test 12
4.2.3 Vacuum test 13
4.3 Oil seals 14
4.4 Exposing the cylinder/
spacer flange
15
4.5 Cylinder and piston 16
4.5.1 Removal 16
4.5.2 Installation 16
4.6 Piston rings 18
4.7 Crankcase 18
4.7.1 Removing the crank-
shaft
18
4.7.2 Installing the crankshaft20
5. Ignition system 23
5.1 Spark plug terminal 23
5.2 Ignition module 24
5.2.1 Ignition timing 24
5.2.2 Removal and installa-
tion
25
5.3 Flywheel 26
6. Rewind starter 27
6.1 General 27
6.2 Starter cover 27
6.3 Rewind spring 28
6.3.1 Replacement 28
6.3.2 Tensioning 28
6.4 Starter rope
(ElastoStart)
29
6.5 Starter grip
(ElastoStart)
30
6.6 Starter carrier/pawl 30
7. Throttle control 31
7.1 Throttle trigger/interlock
lever (throttle cable with
one short-circuit wire)
31
7.2 Throttle cable with one
short-circuit wire
32
7.3 Contact spring/detent
spring in control handle
(throttle cable with one
short-circuit wire)
33
7.4 Throttle trigger/interlock
lever (throttle cable with
two short-circuit wires) 33
7.5 Throttle cable with two
short-circuit wires
34
7.6 Adjusting the throttle
cable
34
8. Fuel system 35
8.1 Air filter 35
8.2 Carburetor 35
8.2.1 Leakage testing 35
8.2.2 Removal and
installation
36
8.2.3 Adjustment
(two adjusting screws) 37
8.2.4 Adjustment
(one adjusting screw)
38
8.3 Tank vent 39
8.4 Pickup body 39
8.5 Fuel tank/hoses 40
9. AV system 41
9.1 Repair 41
10. Shaft 43
10.1 Cowhorn handle 43
10.2 Looped handle 43
10.3 Drive shaft/insulating
tube
45
10.4 Protective tube 46
11. Cutting tool drive 47
11.1 Bearing housing
(FS 75)
47
11.2 Gearbox (FS 80, 85) 47
11.3 Gearbox (FC 75) 48
11.4 Clutch drum 50
12. Cutting device (HL 75)51
12.1 Gearbox 51
12.2 Cutting blade 51
12.3 Gearwheel 53
13. Special service tools
and aids
55
13.1 Special tools 55
13.2 Servicing aids 57
© 1996, Andreas Stihl AG & Co., Waiblingen
FS 75
Contents
1