Chain Catcher; Clutch - Stihl 021 Service & Repair Manual

4.2

Chain Catcher

Sprocket cover with integrally
molded chain catcher (1).
If the chain catcher has broken
off (2), repair as follows:
•
Pry the plug out of the front right-
hand AV element.
•
Oil the cylindrical part (1) of the
replacement chain catcher.
•
Push the chain catcher into the
AV element (2) and engage the
peg (3) in the housing bore (4) at
the same time.
021, 023, 025
4.3

Clutch

Troubleshooting chart - see
"Standard Repairs, Trouble-
shooting" handbook.
- Remove the clutch drum/chain
sprocket - see 4.1.
- Remove the air filter -
- On 023 L, remove the filter base -
see 10.2.2.
•
Take out the shutter.
- Pull boot off the spark plug and
then unscrew the spark plug.
1
- Close the decompression valve,
if fitted.
•
Push the locking strip (1)
0000 893 5903 into the cylinder.
see 10.1.
•
Unscrew clutch from the
crankshaft clockwise (left-hand
thread).
- Service the clutch - see
"Standard Repairs,
Trouble-shooting" handbook.
•
Screw on the clutch and tighten
down to 50 Nm (37 lbf.ft).
- Install the clutch drum/chain
sprocket - see 4.1.
7