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RMA 370
English
19
Blade thickness must not be less than
a = 1.6 mm at any point.
Cutting edges may be filed back no
more than b = 5 mm.
Mulching blade
N
Use a caliper gauge to check blade
thickness at a minimum of 5
different points.
N
Place a ruler on the rear edge of the
blade and measure how far it has
been filed back.
Blade thickness must not be less than
a = 1.6 mm at any point.
Blade width at the cutting edges must be
a minimum of b = 22 mm.
Removing the Cutting Blade
N
Use a suitable piece of wood (2) to
block the cutting blade (1).
N
Unscrew the blade mounting screw
(3) and remove the blade.
N
Check the blade mounting screw for
damage.
WARNING
Replace a damaged mounting screw.
Sharpening Instructions
STIHL recommends that you have the
blade resharpened by your dealer. An
incorrectly ground cutting blade (wrong
sharpening angle, out-of-balance) can
cause running problems – STIHL
recommends a STIHL servicing dealer.
N
Cool the cutting blade during
resharpening, e.g. with water.
N
Sharpen the cutting blade uniformly
to avoid out-of-balance and
vibrations.
N
Sharpen the cutting edges to an
angle of 30°.
N
Use fine emery paper to remove any
burrs from the cutting edges after
resharpening.
Installing the Cutting Blade
N
Clean mounting faces and thread
(1).
N
Fit the cutting blade (2) with the
upturned ends facing up – the
retaining lugs (3) must engage the
holes (4) in the blade.
N
Use a suitable piece of wood (5) to
block the blade.
N
Check the blade mounting screw (6)
for damage.
WARNING
Replace a damaged mounting screw.
N
Insert the blade mounting screw,
tighten it down to a torque of 12 Nm
and secure with Loctite 243 or
Loctite 242.
b
b
a
9929BA038 KN
1
9929BA041 KN
2
3
9929BA042 KN
1
3
2
4
6
2
9929BA044 KN
5