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
Model
Serial number
Guide bar part number
Chain part number
34 Maintenance and Repairs
Users of this machine may only carry out the
maintenance and service work described in this
user manual. All other repairs must be carried
out 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.
When repairing the machine, only use replace‐
ment parts which have been approved by STIHL
for this power tool or are technically identical.
Only use high-quality replacement parts in order
to avoid the risk of accidents and damage to the
machine.
STIHL recommends the use of original STIHL
replacement parts.
Original STIHL parts can be identified by the
STIHL part number, the { logo and the
STIHL parts symbol K (the symbol may appear
alone on small parts).
35 Disposal
Observe all country-specific waste disposal rules
and regulations.
000BA073 KN
STIHL products must not be thrown in the gar‐
bage can. Take the product, accessories and
packaging to an approved disposal site for envi‐
ronment-friendly recycling.
Contact your STIHL servicing dealer for the lat‐
est information on waste disposal.
36 EC Declaration of Con‐
formity
ANDREAS STIHL AG & Co. KG
Badstr. 115
D-71336 Waiblingen
Germany
declare in exclusive responsibility that the prod‐
uct
Category: Chainsaw
Make: STIHL
Model: MS 231
MS 231 C
MS 231 C-BE
MS 251
MS 251 C
MS 251 C-BE
Serial identification: 1143
Displacement
all versions of MS 231:
42.6 cm
3
all versions of MS 251:
45.6 cm
3
conforms to the provisions of Directives
2011/65/EU, 2006/42/EC, 2014/30/EU and
2000/14/EC and has been developed and manu‐
factured in compliance with the following stand‐
ards in the versions valid at the time of produc‐
tion:
EN ISO 11681‑1, EN 55012, EN 61000‑6‑1
The measured and guaranteed sound power lev‐
els were determined according to Directive
2000/14/EC, Annex V, using the ISO 9207
standard.
Measured sound power level
all versions of MS 231: 114 dB(A)
all versions of MS 251: 114 dB(A)
Guaranteed sound power level
all versions of MS 231: 116 dB(A)
all versions of MS 251: 116 dB(A)
The EC type examination was carried out by
DPLF
Deutsche Prüf- und Zertifizierungsstelle für Land-
und Forsttechnik (NB 0363)
Max-Eyth-Weg 1
D-64823 Gross-Umstadt
Certification No.
all versions of MS 231: K-EG-2010/5603
all versions of MS 251: K-EG-2010/5605
Technical documents deposited at:
English 34 Maintenance and Repairs
42 0458-737-0121-C