Stihl 026 Instruction Manual - Page 41

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Chain type Pitch Rapid Picco Rapid 0.325" 3/8" 3/8" Minimum groove depth 6.0 mm (0.24") 6.0 mm (0.24") 6.0 mm (0.24") If groove depth is less than specified: The drive link tangs will otherwise scrape along the bottom of the groove the cutters and tie straps will not ride on the bar rails. or sooner if the wear marks on the sprok- ket are deeper than approx. 0.5 mm (1/64") since this would reduce the life of the chain. Check wear marks: Left: on webs of rim sprockets - Right: on teeth of spur sprockets. You can use gauge* 0000 893 4101 to check the depth of the wear marks on spur and rim sprockets. It is best to use two chains in rotation with one sprocket. • Remove chain sprocket cover, • chain and guide bar. Disengage the chain brake: Pull hand guard toward front handle. •••• Use a screwdriver to remove the E-clip. Take off the washer and rim sprocket. Examine splines on clutch drum - if wear marks are severe, fit a new clutch drum: Pull clutch drum and needle cage off the crankshaft - clean the crankshaft stub and needle cage, and lubricate with STIHL grease (tube 0781 120 1111). Reassemble with new rim sprocket • and new clutch drum, if necessary fit rim sprocket with cavities facing outward refit washer and E-clip on the crankshaft. Use only original STIHL clutch drums to ensure correct operation of the chain brake. * Special accessory

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Chain
Pitch
Minimum
type
groove
depth
Rapid
0.325"
6.0 mm (0.24")
Picco
3/8"
6.0 mm (0.24")
Rapid
3/8"
6.0 mm (0.24")
If groove depth is less than specified:
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The drive link tangs will otherwise scrape
along the bottom of the groove -
the cutters and tie straps will not ride on
the bar rails.
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or sooner if the wear marks on the sprok-
ket are deeper than approx.
0.5 mm (
1
/
64
") since this would reduce
the life of the chain.
Check wear marks:
Left:
on webs of rim sprockets -
Right:
on teeth of spur sprockets.
You can use gauge* 0000 893 4101
to check the depth of the wear marks on
spur and rim sprockets.
It is best to use two chains in rotation
with one sprocket.
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•
Remove chain sprocket cover,
chain and guide bar.
•
Disengage the chain brake:
Pull hand guard toward front handle.
* Special accessory
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Use a screwdriver to
•
remove the E-clip.
•
Take off the washer and
•
rim sprocket.
•
Examine splines on clutch drum -
if wear marks are severe, fit a new
clutch drum:
Pull clutch drum and needle cage
off the crankshaft - clean the
crankshaft stub and needle cage,
and lubricate with STIHL grease
(tube 0781 120 1111).
Reassemble with new rim sprocket
and new clutch drum, if necessary -
•
fit rim sprocket with cavities facing
outward -
refit washer and E-clip on the crankshaft.
Use only original STIHL clutch drums to
ensure correct operation
of the chain brake.
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