Taking Care Of The Guide Bar - Stihl HT 56 C Instruction Manual

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17.2 During Operation
NOTICE
Do not make the mixture leaner to achieve an
apparent increase in power – this could damage
the engine – see "Adjusting the Carburetor".
17.2.1 Check chain tension frequently
A new chain has to be retensioned more often
than one that has been in use for some time.
17.2.2 Chain cold
Tension is correct when the chain fits snugly
against the underside of the bar and can still be
pulled along the bar by hand. Retension if neces‐
sary – see "Tensioning the Saw Chain".
17.2.3 Chain at operating temperature
The chain stretches and begins to sag. The drive
links must not come out of the bar groove – the
chain may otherwise jump off the bar. Retension
the chain – see "Tensioning the Saw Chain".
NOTICE
The chain contracts as it cools down. If it is not
slackened off, it can damage the gear shaft and
bearings.
17.2.4 After long period of full-throttle opera‐
tion
Allow engine to run for a short while at idle speed
so that engine heat can be dissipated by the flow
of cooling air. This protects engine-mounted
components (ignition, carburetor) from thermal
overload.
17.3 After Finishing Work
► Slacken off the chain if you have retensioned it
at operating temperature during cutting work.
NOTICE
Always slacken off the chain after finishing work.
The chain contracts as it cools down. If it is not
slackened off, it can damage the gear shaft and
bearings.
17.3.1 Storing your saw for a short period
Fit the chain scabbard and allow engine to cool
down. To avoid condensation, fill the fuel tank
and keep the machine in a dry place, well away
from sources of ignition, until you need it again.
20

18 Taking Care of the Guide Bar

17.3.2 Storing for a long period
See chapter on "Storing the Machine"
18 Taking Care of the Guide
Bar
1
► Turn the bar over – every time you 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), the oil‐
way (2) and the bar groove (3).
► Measure the groove depth – with the scale on
the filing gauge (special accessory) – in the
area used most for cutting.
Chain type Chain pitch
Picco 1/4" P
If groove depth is less than specified:
► Replace the guide bar.
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.
2
3
Minimum
groove
depth
4.0 mm
0458-555-8321-C