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19
ENGLISH
— All cutter length must be equal. Different
cutter lengths prevent the saw chain from
running smoothly and may cause the saw
chain to break.
— Do not sharpen the chain when the cutter
length has reached 3 mm (1/8") or shorter.
The chain must be replaced with new one.
— The chip thickness is determined by the
distance between the depth gauge (round
nose) and the cutting edge.
— The best cutting results are obtained with
following distance between cutting edge
and depth gauge.
• Chain blade 90PX : 0.65 mm (0.025″)
• Chain blade 91PX : 0.65 mm (0.025″)
30
30
55
55
— The sharpening angle of 30° must be
the same on all cutters. Different cutter
angles cause the chain to run roughly and
unevenly, accelerate wear, and lead to
chain breaks.
— Use a suitable round le so that the proper
sharpening angle is kept against the teeth.
• Chain blade 90PX : 55°
• Chain blade 91PX : 55°
File and le guiding
— Use a special round le (optional accessory)
for saw chains to sharpen the chain. Normal
round les are not suitable.
— Diameter of the round le for each saw
chain is as follows:
• Chain blade 90PX : 4.5 mm (3/16″)
• Chain blade 91PX : 4.0 mm (5/32″)
— The le should only engage the cutter on
the forward stroke. Lift the le off the cutter
on the return stroke.
— Sharpen the shortest cutter rst. Then the
length of this shortest cutter becomes the
standard for all other cutters on the saw
chain.
— Guide the le as shown in the gure.
1
2
► 1. File 2. Saw chain
—
The le can be guided more easily if a le
holder (optional accessory) is employed.
The le holder has markings for the correct
sharpening angle of 30° (align the markings
parallel to the saw chain) and limits the depth
of penetration (to 4/5 of the le diameter).
30
1/5
1
► 1. File holder
— After sharpening the chain, check the height
of the depth gauge using the chain gauge
tool (optional accessory).
—
Remove any projecting material, however small,
with a special at le (optional accessory).
— Round off the front of the depth gauge
again.
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