Clutch, Chain Drive Chain Brake And Chain Tensioner; Clutch Drum And Chain Sprocket - Stihl 029, 039 Service Manual

STIHL 029, 039
3. CLUTCH, CHAIN DRIVE
CHAIN BRAKE AND
CHAIN TENSIONER
3.1 Clutch Drum and
Chain Sprocket
Top:
Sprocket cover mounting nuts
Bottom:
Disengaging chain brake
- Unscrew sprocket cover nuts
and remove the sprocket cover.
- Disengage the chain brake by
pulling the hand guard back
toward the front handle.
- Pry the E-clip off the crankshaft.
Top:
Removing E-clip
Bottom:
Removing chain sprocket
- Remove the washer from the
clutch drum or chain sprocket.
- Remove the spur sprocket or rim
sprocket with clutch drum.
- Take the needle cage out of the
clutch drum or chain sprocket.
Reassemble in the reverse
sequence.
Top:
Removing needle cage
Bottom:
Assembly sequence of chain drive
1 = Spur sprocket
2 = Needle cage
3 = Washer
4 = E-clip
5 = Clutch drum (for rim sprocket)
6 = Rim sprocket
Note: Clean stub of crankshaft.
Replace the needle cage or wash
it in clean white spirit and lubricate
with STIHL multipurpose grease,
see 12.2.
Push clutch drum/chain sprocket
onto crankshaft and rotate it until
tang of spring on oil pump worm
engages the notch in the clutch
drum.
Important: Rim sprocket must be
fitted with the chip ejector cavities
facing outward.
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