Instruction Manual
Table Of Contents
- STIHL FS 91, 91 R
- 1 Guide to Using this Manual
- 2 Safety Precautions and Working Techniques
- 2.1 Clothing and equipment
- 2.2 Transporting the machine
- 2.3 Refueling
- 2.4 Before starting
- 2.5 Starting the engine
- 2.6 Holding and guiding the machine
- 2.7 While working
- 2.8 Using mowing heads
- 2.9 When using metal cutting attachments
- 2.10 Vibrations
- 2.11 Maintenance and Repairs
- 2.12 Symbols on Deflectors
- 2.13 Shoulder Strap/Harness
- 2.14 Mowing Head with Nylon Line
- 2.15 STIHL Polycut Mowing Head with Polymer Blades
- 2.16 Risk of Kickout (Blade Thrust) with Metal Cutting Attachments
- 2.17 Grass Cutting Blade
- 2.18 Brush Knife
- 2.19 Circular Saw Blade
- 3 Approved Combinations of Cutting Attachment, Deflector, Handle and Harness
- 4 Approved Power Tool Attachments
- 5 Mounting the Bike Handle
- 6 Mounting the Loop Handle
- 7 Adjusting the Throttle Cable
- 8 Fitting the Carrying Ring
- 9 Mounting the deflector
- 10 Mounting the Cutting Attachment
- 10.1 Placing power tool on the ground
- 10.2 Mounting Hardware for Cutting Attachments
- 10.3 Blocking the Shaft
- 10.4 Removing the Mounting Hardware
- 10.5 Mounting the Cutting Attachment
- 10.6 Fitting Mowing Head with Screw Mounting
- 10.7 Remove the mowing head.
- 10.8 Mounting Metal Cutting Attachments
- 10.9 Removing the Metal Cutting Attachment
- 11 Fuel
- 12 Fueling
- 13 Fitting the Harness
- 14 Balancing the Machine
- 15 Starting / Stopping the Engine
- 16 Transporting the Unit
- 17 Operating Instructions
- 18 Replacing the Air Filter
- 19 Adjusting the Carburetor
- 20 Spark Arresting Screen in Muffler
- 21 Spark Plug
- 22 Engine Running Behavior
- 23 Lubricating the Gearbox
- 24 Storing the Machine
- 25 Sharpening Metal Cutting Blades
- 26 Maintaining the Mowing Head
- 27 Maintenance and Care
- 28 Minimize Wear and Avoid Damage
- 29 Main Parts
- 30 Specifications
- 31 Maintenance and Repairs
- 32 Disposal
- 33 EC Declaration of Conformity
(Ø 250 mm)
13 Circular saw blade 200-22 chisel tooth
(4112), circular saw blade 200-22 HP chisel
tooth (4001)
WARNING
Grass cutting blades, brush knives and circular
saw blades of other, non-metal materials must
not be used.
3.3 Deflectors, limit stop
14 Deflector for mowing heads
15 Deflector with
16 Skirt and blade for mowing heads
17 Deflector without skirt and blade for metal cut‐
ting attachments, items 7 to 1 2
18 Limit stop for circular saw blades
3.4 Handles
19 Loop handle
20 Loop handlewith
21 Barrier bar
22 Bike handle
3.5 Shoulder straps
23 Shoulder strap can be used
24 Shoulder strap must be used
25 Full harness can be used
26 Full harness must be used
4 Approved Power Tool
Attachments
The following STIHL attachments may be used
with the basic power tool:
Attachment Application
BF Cultivator
FCS
2) 3)
Edger
FH 145° Power scythe, adjustable
HL 0°
1)
Long reach hedge trim‐
mer
HL 145°
2)
Hedge trimmer, adjusta‐
ble
HT
1)
Pole pruner
RG
5)
Weeder
Attachment Application
SP
1) 4)
Special harvester
SP 10
1)
Special harvester
5 Mounting the Bike Handle
5.1 Mounting Bike Handle with
Swiveling Handle Support
The machine is supplied with the swiveling han‐
dle support already mounted on the shaft. To
mount the handlebar it is necessary to remove
the clamp moldings.
5.1.1 Removing the Clamp Moldings
► Hold the lower clamp (1) and upper clamp (2)
firmly together.
► Release the wing screw (3) – the clamps are
loose once the wing screw has been released.
They are pushed apart by the two
springs (4 and 5).
► Pull out the wing screw – the washer (6)
remains on the wing screw.
► Separate the clamp moldings – the
springs (4 and 5) remain in the lower clamp.
1)
Not approved for models with bike handle
2)
Limited suitability for models with bike handle
3)
It is not necessary to use the shoulder strap
4)
Use handle hose supplied with the machine
5)
Use barrier bar supplied with the loop handle
4 Approved Power Tool Attachments English
0458-426-8321-B 13