Instruction Manual
Table Of Contents
- STIHL MS 661 C-M
- 1 Introduction
- 2 Guide to Using this Manual
- 3 Overview
- 4 Safety Precautions
- 5 Preparing the Saw for Operation
- 6 Assembling the Saw
- 7 Engaging and Disengaging the Chain Brake
- 8 Mixing Fuel and Refueling the Chainsaw
- 9 Starting and Stopping the Engine
- 10 Checking the Saw
- 11 Operating the Saw
- 12 After Finishing Work
- 13 Transporting
- 14 Storing
- 15 Cleaning
- 16 Maintenance
- 17 Repairing
- 18 Troubleshooting
- 19 Specifications
- 20 Bar and Chain Combinations
- 21 Spare Parts and Accessories
- 22 Disposal
- 23 EC Declaration of Conformity

Carrying the saw
► Carry the saw by holding the front handle in
your right hand with the guide bar pointing to
the rear.
Transporting the saw in a vehicle
► Secure the saw to prevent turnover and move‐
ment.
14 Storing
14.1 Storing the Chainsaw
► Shut off the engine and engage the chain
brake.
► Fit the scabbard so that it completely covers
the guide bar.
► Observe the following points when storing the
saw:
–
Saw is out of the reach of children.
–
The saw is clean and dry.
15 Cleaning
15.1 Cleaning the Saw
► Shut off the engine and engage the chain
brake.
► Allow chainsaw to cool down.
► Clean the saw with a damp cloth or STIHL
resin solvent.
► Clean cooling air slots with a soft brush.
1
5
3
4
2
0000-GXX-A388-A0
► Rotate the filter cover lock (1) a quarter turn
counterclockwise.
► Remove the filter cover (2).
► Pull off the spark plug boot (3).
► Rotate the shroud lock (4) counterclockwise
until the shroud (5) can be removed.
► Remove the shroud (5).
► Remove the chain sprocket cover.
► Use a soft brush, damp cloth or STIHL resin
solvent to clean the cylinder fins, the inside of
the shroud and filter cover..
► Clean the area around the sprocket with a
damp cloth or STIHL resin solvent.
► Place the shroud (5) in position.
► Turn the shroud lock (4) clockwise and tighten
it down firmly.
The shroud is closed.
► Press the spark plug boot (3) firmly home.
► Fit the filter cover (2).
► Rotate the filter cover lock (1) clockwise until
you hear a click.
The filter cover lock (1) is secure.
► Fit the chain sprocket cover.
15.2 Cleaning the Bar and Chain
► Shut off the engine and engage the chain
brake.
► Remove the bar and chain.
1
2
0000-GXX-2951-A0
3
3
► Clean the oil port (1), oil inlet hole (2) and bar
groove (3) with a soft brush or STIHL resin
solvent.
► Clean the saw chain with a soft brush or
STIHL resin solvent.
► Mount the bar and chain.
15.3 Cleaning the Air Filter
Very fine dust can collect in the air filter. The
dust can clog the filter and cannot be removed
by brushing or knocking out. The air filter must
be cleaned with a cleaning agent.
► Shut off the engine and engage the chain
brake.
0000-GXX-5819-A0
3
1
2
► Rotate the filter cover lock (1) a quarter turn
counterclockwise.
► Remove the filter cover (2).
► Clean the area around the air filter (3) with a
damp cloth or a soft brush.
► Remove the air filter (3).
► Rinse away coarse dirt from the outside of the
filter (3) under running water.
14 Storing English
0458-759-0121-D. VA0.A21. 23