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
The following intervals apply for normal operating
conditions. The specified intervals must be short‐
ened accordingly when working for longer than nor‐
mal or under difficult cutting conditions (extensive
dust, etc.).
Before starting work
At the end of work and/or daily
Whenever tank is refilled
Weekly
Monthly
Annually
If faulty
If damaged
As required
Have replaced by serv‐
icing dealer
1)
X
Cutting attachment Visual inspection X X
replace X
Check for secure fit X X
Metal cutting attachment sharpen X X
Gearbox lubrication check X
top up X
Safety information label replace X
1)STIHL recommends STIHL dealers2)Only if there is a noticeable loss of engine power
28 Minimize Wear and Avoid
Damage
Observing the instructions in this manual helps
reduce the risk of unnecessary wear and dam‐
age to the power tool.
The power tool must be operated, maintained
and stored with the due care and attention
described in this owner's manual.
The user is responsible for all damage caused by
non-observance of the safety precautions, oper‐
ating and maintenance instructions in this man‐
ual. This includes in particular:
–
Alterations or modifications to the product not
approved by STIHL.
–
Using tools or accessories which are neither
approved or suitable for the product or are of a
poor quality.
–
Using the product for purposes for which it
was not designed.
–
Using the product for sports or competitive
events.
–
Consequential damage caused by continuing
to use the product with defective components.
28.1 Maintenance Work
All the operations described in the "Maintenance
Chart" must be performed on a regular basis. If
these maintenance operations cannot be per‐
formed by the owner, they should be performed
by a servicing dealer.
STIHL recommends that you have servicing and
repair work carried out exclusively by an author‐
ized STIHL servicing dealer. STIHL dealers are
regularly given the opportunity to attend training
courses and are supplied with the necessary
technical information.
If these maintenance operations are not carried
out as specified, the user assumes responsibility
for any damage that may occur. Among other
parts, this includes:
–
Damage to the engine due to neglect or defi‐
cient maintenance (e.g. air and fuel filters),
incorrect carburetor adjustment or inadequate
cleaning of cooling air inlets (intake ports, cyl‐
inder fins).
–
Corrosion and other consequential damage
resulting from improper storage.
–
Damage to the machine resulting from the use
of poor quality replacement parts.
28.2 Parts Subject to Wear and Tear
Some parts of the power tool are subject to nor‐
mal wear and tear even during regular operation
in accordance with instructions and, depending
on the type and duration of use, have to be
replaced in good time. Among other parts, this
includes:
–
Cutting attachments (all types)
English 28 Minimize Wear and Avoid Damage
36 0458-426-8321-B