Stihl 029, 039 - 3. CLUTCH, CHAIN DRIVE, CHAIN BRAKE AND CHAIN TENSIONER; 3.1 Clutch Drum and Chain Sprocket

STIHL 029, 039 14
3. CLUTCH, CHAIN DRIVE
CHAIN BRAKE AND
CHAIN TENSIONER
3.1 Clutch Drum and
Chain Sprocket
Top:
Removing needle cage
Bottom:
Assembly sequence of chain drive
1 = Spur sprocket
Top: Top: 2 = Needle cage
Sprocket cover mounting nuts Removing E-clip 3 = Washer
4 = E-clip
Bottom: Bottom: 5 = Clutch drum (for rim sprocket)
Disengaging chain brake Removing chain sprocket 6 = Rim sprocket
- Unscrew sprocket cover nuts - Remove the washer from the Note: Clean stub of crankshaft.
and remove the sprocket cover. clutch drum or chain sprocket. Replace the needle cage or wash
it in clean white spirit and lubricate
- Disengage the chain brake by - Remove the spur sprocket or rim with STIHL multipurpose grease,
pulling the hand guard back sprocket with clutch drum. see 12.2.
toward the front handle.
- Take the needle cage out of the Push clutch drum/chain sprocket
- Pry the E-clip off the crankshaft. clutch drum or chain sprocket. onto crankshaft and rotate it until
tang of spring on oil pump worm
Reassemble in the reverse engages the notch in the clutch
sequence. drum.
Important: Rim sprocket must be
fitted with the chip ejector cavities
facing outward.