Use and Care Manual
34
The sharpening angle (α) must be identical for all cutters!
30° for chain type 092 (91VG), 492 (91PX), 290 (90SG),
291 (90PX)
The teeth will have the proper angle (ß) automatically if the
proper round le is used.
80° for chain type 092 (91VG), 492 (91PX)
75° for chain type 290 (90SG), 291 (90PX)
Dierent angles result in a roughly, irregularly running chain,
increase wear and tear and cause chain beakage.
MAINTENANCE
Sharpening the saw chain
CAUTION: Before doing any work on the guide bar or
(see “Replacing the spark plug”).
Always wear protective gloves!
The chain needs sharpening when:
The sawdust produced when sawing damp wood looks like
wood our.
The chain penetrates the wood only under great pressure.
The cutting edge is visibly damaged.
The saw is pulled to the left or right when sawing. This is
caused by uneven sharpening of the chain.
Important: Sharpen frequently, but without removing
too much metal!
Generally, 2 or 3 strokes of the le will be enough.
Have the chain resharpened at a service center when you
have already sharpened it yourself several times.
Proper sharpening:
CAUTION: Use only chains and guide bars designed for
this saw (see the “Extract from the spare-parts list”)!
All cutters must be of the same length (dimension a). Cutters
with dierent lengths result in rough running of the chain and
can cause cracks in the chain.
The minimum cutter length: 0.11” (3 mm). Do not resharpen
the chain when the minimum cutter length has been reached;
at this point, the chain must be replaced (see the “Extract from
the spare-parts list” and “Replacing the saw chain”).
The depth of the cut is determined by the dierence in
height between the depth limiter (round nose) and the cut-
ting edge.
The best results are obtained with a depth-limiter depth of
.025” (0.64 mm).
CAUTION: Excessive depth
increases the risk of kickback!