Stihl MS 661 C-M Instruction Manual

0458-759-8221-C
33
English 8 Maintenance, Repair and Storage
8.1 Warnings and Instructions
WARNING
￭ There are no user-authorized repairs for the chain saw. To
reduce the risk of fire or other personal injury and property
damage:
– Users may carry out only the cleaning and
maintenance operations described in this manual.
– Strictly follow the cleaning and maintenance
instructions in the appropriate sections of this
instruction manual.
– STIHL recommends that all repair work be
performed by authorized STIHL servicing dealers.
￭ To reduce the risk of personal injury and property damage
from unintentional starting:
– Shut off the engine and engage the chain brake by
moving the front hand guard forward before
inspecting the chain saw or carrying out any
cleaning, maintenance or repair work. Always shut
off the engine before storing the chain saw, and any
other time it is not in use.
￭ Proper maintenance will help maintain cutting
performance and reduce the risk of personal injury caused
by chain derailment and reactive forces.
– Wear gloves when handling the saw chain.
– Keep the chain, guide bar and sprocket clean.
– Replace the chain and guide bar when they become
worn or damaged.
– Keep the chain sharp and at proper tension.
– Tighten all nuts, bolts and screws after each use.
￭ Like an automobile brake, the chain brake on your chain
saw incurs wear each time it is engaged. In order for the
chain brake on your STIHL chain saw to function properly,
it must be properly maintained. Return the chain saw to
your STIHL servicing dealer for periodic inspection and
servicing of the brake system according to the following
schedule:
– Heavy Usage: every 3 months
– Moderate Usage: every 6 months
– Occasional Usage: every 12 months
￭ Return the chain saw immediately for maintenance
whenever the brake system cannot be thoroughly cleaned
or there is a change in its operating characteristics.
￭ Use of parts that are not authorized or approved by STIHL
may cause serious or fatal injury or property damage.
– STIHL recommends that only identical STIHL
replacement parts be used for repair or
maintenance.
￭ Improper storage can result in unauthorized use, damage
to the chain saw and an increased risk of fire and other
personal injury or property damage.
– Shut off the engine and engage the chain brake by
moving the front hand guard forward before storing.
– Store the chain saw indoors in a dry, secure place
that cannot be accessed by children or other
unauthorized users.
9.1 Preparing the Chain Saw for Operation
Before starting work:
► Mount the guide bar and saw chain, @ 10.2.1.
► Tension the chain, @ 10.3.
► Fill the chain oil tank, @ 11.2.
► Refuel the chain saw, @ 13.2.
► Check the chain brake, @ 16.1.
► Check the controls for proper function and condition,
@ 16.2.
► Check the chain oil flow rate, @ 16.3.
8 Maintenance, Repair and Storage
9 Before Starting Work

Stihl MS 661 C-M Specifications

General

Idle speed	- RPM
Motor type	2-stroke motor
Chain pitch	3/8 \
Blade length	800 mm
Product color	Black, Grey, Orange
Automatic oiling	Yes
Engine displacement	91.1 cm³
Power source	Gasoline
Sound power level	118 dB
Vibration emission	6.9 m/s²
Sound pressure level	105 dB

Weight and Dimensions

Weight	7400 g