Checking And Replacing The Chain Sprocket; Maintaining And Sharpening The Saw Chain - Stihl HT 56 C Instruction Manual

23 Checking and Replacing the Chain Sprocket

► If the unit is stored with the shaft disassem‐
bled: Attach the protective cap to the shaft to
prevent dirt from getting into the coupling
► Thoroughly clean the unit, especially the cylin‐
der fins and air filter
► When using biological chain oil (e.g. STIHL
BioPlus), fill the lubricant oil tank
► Store the machine in a dry and secure location
Keep out of the reach of children and other
unauthorized persons
23 Checking and Replacing
the Chain Sprocket
► Remove chain sprocket cover, saw chain and
guide bar
23.1 Replace the chain sprocket
– replace 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
Using two saw chains in alternation helps pre‐
serve the chain sprocket.
STIHL recommends the use of original STIHL
chain sprockets.
The chain sprocket is driven via a friction clutch.
Have the chain sprocket replaced by an author‐
ized dealer.
0458-555-8321-C
a
STIHL recommends that maintenance and repair
work be carried out only by authorised STIHL
dealers.
24 Maintaining and Sharpen‐
ing the Saw Chain
24.1 Cutting effortlessly with a cor‐
rectly sharpened chain
A properly sharpened chain slices through wood
effortlessly and requires very little feed pressure.
Do not work with a dull or damaged chain as it
will increase the physical effort required, produce
unsatisfactory results and a higher rate of wear.
► Clean the chain.
► Check the chain for cracks in the links and
damaged rivets.
► Replace any damaged or worn parts of the
chain and match the new parts to the shape
and size of the original parts.
Carbide-tipped saw chains (Duro) are particularly
wear resistant. STIHL recommends you have
your chain resharpened by a STIHL servicing
dealer.
WARNING
It is absolutely essential to comply with the
angles and dimensions specified below. If the
saw chain is incorrectly sharpened – and in par‐
ticular if the depth gauge is set too low – there is
an increased risk of kickback, with resulting risk
of injury.
The saw chain cannot be locked in place on the
guide bar. Therefore, it is best to remove the
chain from the bar and resharpen it on a work‐
shop sharpening tool (FG 2, HOS, USG).
24.2 Chain pitch
The chain pitch (a) is marked on the depth gauge
end of each cutter.
English
a
23