Stihl MS 661 C-M, Instruction Manual

► If you cannot carry out these steps: Do not use

your chainsaw and contact your STIHL servic‐

ing dealer for assistance.

6

Assembling the Saw

6.1

Mounting and Removing the

Bar and Chain

6.1.1

Mounting the Bar and Chain

The bar and chain combinations that can be

used with the chain sprocket are listed in the

specifications,   20.1.

► Shut off the engine and engage the chain

brake.

1 

4

3

2

0000-GXX-A371-A0

► Rotate the nuts (1) counterclockwise until the

chain sprocket cover (2) can be removed.

► Remove the chain sprocket cover (2).

► Turn the tensioning screw (3) counterclock‐

wise until the tensioner slide (4) butts against

the left end of the housing.

0000-GXX-2954-A0

► Fit the chain in the bar groove so that the

arrows on the tie straps on the top of the bar

point in the direction of rotation.

8

7

6

5

5

0000-GXX-A372-A0

► Fit the guide bar and chain on the saw and

check the following points:

–

Chain drive links are seated in teeth of

chain sprocket (7).

–

Collar studs (5) are located in slot in tail of

guide bar (6).

–

Peg of tensioner slide (4) engages hole (8)

in guide bar (6).

The guide bar (6) may be either way round. The

logo on the guide bar (6) may also be upside

down.

► Disengage the chain brake.

3

6

0000-GXX-A385-A0

► Turn the tensioning screw (3) clockwise until

the chain fits snugly against the bar. Make

sure the drive link tangs engage the bar

groove.

The guide bar (6) and chain are seated

against the saw.

► Fit the sprocket cover (2) so that it is flush with

the saw.

► Fit and tighten down the nuts (1) firmly.
6.1.2

Removing the Bar and Chain

► Shut off the engine and engage the chain

brake.

► Rotate the nuts counterclockwise until the

chain sprocket cover can be removed.

► Remove the sprocket cover.

► Turn the tensioning screw counterclockwise as

far as stop.

The chain is now slack.

► Remove the bar and chain.

6.2

Tensioning the Saw Chain

The saw chain expands or contracts during cut‐

ting work. Chain tension changes as a result.

Check chain tension regularly during operation

and readjust if necessary.

► Shut off the engine and engage the chain

brake.

6 Assembling the Saw

English

0458-759-0121-D. VA0.A21.

11