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Checking the Chain

Sprocket

NDisengage the chain brake: Pull the hand guard toward the front handle.

NRemove the chain sprocket cover, chain and guide bar.

Replace the chain sprocket

001BA120 KN

–after using two saw chains or sooner

–if the wear marks (arrows) on the sprocket are deeper than approx. 0.02 in (0.5 mm) 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 sprockets to ensure correct operation of the chain brake.

Have the chain sprocket replaced by a servicing dealer. STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer.

Maintaining and Sharpening the Saw Chain

Cutting effortlessly with a correctly 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.

NClean the chain.

NCheck the chain for cracks in the links and damaged rivets.

NReplace 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.

It is absolutely essential to comply with the angles and dimensions specified below. If the saw chain is incorrectly sharpened – and in particular if the depth gauge is set too low – there is a risk of increased kickback of the saw, with resulting risk of injury.

a

689BA027 KN

The chain pitch (a) is marked on the depth gauge end of each cutter.

Mark (a)

Chain pitch

 

inch

mm

1/4 or 1

1/4

6,35

P, PM or 6

3/8 P

9,32

325 or 2

0.325

8,25

3/8 or 3

3/8

9,32

404 or 4

0.404

10,26

Use only special saw chain sharpening files. Other files have the wrong shape and cut.

Select file diameter according to chain pitch – see table “Sharpening Tools”.

You must observe certain angles when resharpening the chain cutter.

A

B

KN

689BA021

 

AFiling angle

BSide plate angle

42

MS 192 C