Instruction Manual
Table Of Contents
- STIHL MS 231, 251
- 1 Guide to Using this Manual
- 2 Safety Precautions
- 3 Reactive Forces
- 4 Working Techniques
- 5 Cutting Attachment
- 6 Mounting the Bar and Chain (side chain tensioner)
- 7 Mounting the Bar and Chain (quick chain tensioner)
- 8 Tensioning the Saw Chain (side chain tensioner)
- 9 Tensioning the Saw Chain (quick chain tensioner)
- 10 Checking Chain Tension
- 11 Fuel
- 12 Fueling
- 13 Chain Lubricant
- 14 Filling Chain Oil Tank
- 15 Checking Chain Lubrication
- 16 Chain Brake
- 17 Winter Operation
- 18 Starting / Stopping the Engine
- 18.1 Positions of Master Control Lever
- 18.2 Setting the Master Control Lever
- 18.3 Fuel pump
- 18.4 Holding the Saw
- 18.5 Cranking
- 18.6 Starting the Saw
- 18.7 When engine begins to fire
- 18.8 As soon as the engine runs
- 18.9 At very low outside temperatures
- 18.10 Stopping the engine
- 18.11 If the engine does not start
- 19 Operating Instructions
- 20 Taking Care of the Guide Bar
- 21 Shroud
- 22 Air Filter System
- 23 Cleaning the Air Filter
- 24 Adjusting the Carburetor
- 25 Spark Plug
- 26 Storing the Machine
- 27 Checking and Replacing the Chain Sprocket
- 28 Maintaining and Sharpening the Saw Chain
- 29 Maintenance and Care
- 30 Minimize Wear and Avoid Damage
- 31 Main Parts
- 32 Specifications
- 33 Ordering Spare Parts
- 34 Maintenance and Repairs
- 35 Disposal
- 36 EC Declaration of Conformity
22.2 HD2 Filter
5902BA008 KN
–
HD2 filter (black filter frame, pleated filter
material) for extreme wintry conditions (e.g.
powder or drifting snow) or very dusty work
areas.
22.3 Synthetic Fiber/Fleece Filter
208BA028 KK
–
Fleece filter for normal operating conditions
and dry work areas.
–
Synthetic fiber filter for wintry conditions.
23 Cleaning the Air Filter
23.1 If there is a noticeable loss of
engine power
► Remove the shroud – see "Shroud".
► Clean away loose dirt from around the filter.
23.1.1 Removing the Air Filter (round filter)
NOTICE
To avoid damaging the filter, do not use tools for
removing and installing the air filter.
1.
2710BA000 KN
2.
► Rotate the air filter a 1/4 turn counterclockwise
and lift it away in the direction of the rear han‐
dle.
► Always replace a damaged filter.
23.1.2 Removing the Air Filter (synthetic fiber
filter)
0000-GXX-0845-A0 KN
1
1
► Squeeze both locking tabs (1) and lift filter
away.
► Always replace a damaged filter.
23.1.3 Cleaning the Air Filter
► Knock out the filter or blow it clear with com‐
pressed air from the inside outwards.
Wash the filter thoroughly if knocking it out or
blowing it clear is not sufficient to remove stub‐
born dirt, or if the filter fabric is sticky.
Washing the filter
► Wash the filter in STIHL special cleaner (spe‐
cial accessory) or a clean, non-flammable sol‐
ution (e.g. warm soapy water). Rinse the filter
from the inside outwards under a jet of water –
do not use a pressure washer.
► Dry the filter components – do not expose to
high temperatures.
► Do not impregnate the filter with oil.
English 23 Cleaning the Air Filter
30 0458-737-0121-C