STIHL MS 250 manual Slide needle cage onto the crankshaft stub, Chain pitch

English

Install spur chain sprocket / rim sprocket

NClean crankshaft stub and needle cage and lubricate with STIHL lubricant (special accessory)

NSlide needle cage onto the crankshaft stub

NAfter refitting, turn the clutch drum and/or spur chain sprocket approx. 1 full turn so that the carrier for the oil pump drive engages

NRefit the rim sprocket – cavities toward the outside

NRefit washer and E-clip on the crankshaft

Maintaining and Sharpening the Saw Chain

Sawing effortlessly with a properly sharpened saw chain

A properly sharpened saw chain cuts through wood effortlessly even with very little pushing.

Never use a dull or damaged saw chain

–this leads to increased physical strain, increased vibration load, unsatisfactory cutting results and increased wear.

NClean the saw chain

NCheck the saw chain for cracks and damaged rivets

NReplace damaged or worn chain components and adapt these parts to the remaining parts in terms of shape and level of wear – rework accordingly

Carbide-tipped (Duro) saw chains are especially wear-resistant. For an optimal sharpening result, STIHL recommends STIHL servicing dealers.

WARNING

Compliance with the angles and dimensions listed below is absolutely necessary. An improperly sharpened saw chain – especially depth gauges that are too low – can lead to increased kickback tendency of the chain saw – risk of injury!

Chain pitch

a

689BA027 KN

The chain pitch marking (a) is embossed in the area of the depth gauge of each cutter.

Marking (a)	Chain pitch
	Inches	mm
7	1/4 P	6.35
1 or 1/4	1/4	6.35
6, P or PM	3/8 P	9.32
2 or 325	0.325	8.25
3 or 3/8	3/8	9.32
4 or 404	0.404	10.26

The diameter of file to be used depends on the chain pitch – see table "Sharpening tools".

The angles of the cutter must be maintained during resharpening.

46 MS 250