Taking Care Of The Guide Bar; Checking And Replacing The Chain Sprocket - Stihl HT-KM Instruction Manual

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Taking Care of the Guide Bar

2
1
Turn the bar over every time you
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sharpen the chain and every time
you replace the chain – this helps
avoid one-sided wear, especially at
the nose and underside of the bar.
Regularly clean the oil inlet hole (1),
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the oilway (2) and the bar
groove (3).
Measure the groove depth – with the
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scale on the filing gauge (special
accessory) – in the area used most
for cutting.
Chain type Chain pitch Minimum
groove depth
Picco 1/4" P 4.0 mm
(0.16 in)
If groove depth is less than specified:
Replace the guide bar.
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18
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.
3
Checking and Replacing the
Chain Sprocket
Remove the chain sprocket cover,
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chain and guide bar.
Replace the chain sprocket:
a
after using two saw chains or
–
sooner
if the wear marks (a) on the sprocket
–
are deeper than approx. 0.5 mm
(0.02 in) since this would reduce the
life of the chain. You can use a
gauge (special accessory) to check
the depth of the wear marks.
It is best to use two saw chains in
rotation with one sprocket.
STIHL recommends the use of original
STIHL chain sprockets.
HT-KM