Front/Side Chain Tensioner - Stihl 021 Service & Repair Manual

4.5 Front Chain Tensioner
- Remove the chain sprocket
cover.
•
Pull the cover out of the engine
housing.
1
2
3
•
Unscrew the nut (1) from the
adjusting screw (2).
•
Take the adjusting screw out of
the cover (3).
Reverse the above sequence to
install the chain tensioner.
12
4.6 Side Chain Tensioner
- Remove the chain sprocket
cover.
•
Take out the screw.
- Pull the complete tensioner
assembly out of the engine
housing.
1 4 2 3
•
Take the thrust pad (1) off the
adjusting screw (2).
•
Rotate the spur gear (3) until the
adjusting screw comes out of the
tensioner slide (4).
•
Pull the spur gear out of the
cover.
•
Pull the tensioner slide off the
cover.
- Take the adjusting screw out of
the cover.
- Inspect the teeth on the spur
gear and adjusting screw.
Replace both parts if necessary.
Reverse the above sequence to
install the chain tensioner.
- Coat teeth of adjusting screw
and spur gear with grease,
see 11.2, before refitting.
021, 023, 025