Stihl RMA 370 Instruction Manual page 21

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
a
Use a caliper gauge to check blade
N
thickness at a minimum of 5
different points.
Place a ruler on the rear edge of the
N
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.
RMA 370
Removing the Cutting Blade
3
2
Use a suitable piece of wood (2) to
N
block the cutting blade (1).
Unscrew the blade mounting screw
N
(3) and remove the blade.
Check the blade mounting screw for
N
damage.
b
b
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.
Cool the cutting blade during
N
resharpening, e.g. with water.
Sharpen the cutting blade uniformly
N
to avoid out-of-balance and
vibrations.
Sharpen the cutting edges to an
N
angle of 30°.
Use fine emery paper to remove any
N
burrs from the cutting edges after
resharpening.
Installing the Cutting Blade
1
1
Clean mounting faces and thread
N
(1).
4
2
Fit the cutting blade (2) with the
N
upturned ends facing up – the
retaining lugs (3) must engage the
holes (4) in the blade.
Use a suitable piece of wood (5) to
N
block the blade.
Check the blade mounting screw (6)
N
for damage.
WARNING
Replace a damaged mounting screw.
Insert the blade mounting screw,
N
tighten it down to a torque of 12 Nm
and secure with Loctite 243 or
Loctite 242.
English
2
6
3
5
19