Instruction Manual

RMA 510
English
26
N Use a caliper gauge to check blade
thickness at a minimum of 5
different points.
N Place a ruler on the front edge of the
blade and measure how far it has
been filed back.
Blade thickness must not be less than
a =3.0 mm (0.118 in.) at any point.
Angle ‘b’ must be 30°.
Blade width at its narrowest point must
be at least c =45 mm (1.772 in.).
Removing the Cutting Blade
N Use a suitable piece of wood (2) to
block the cutting blade (1).
N Take out the mounting screw (3)
and remove the washer (4).
N Check the blade mounting screw (3)
and washer (4) for damage.
N Remove the cutting blade (1).
Sharpening Instructions
WARNING
STIHL recommends that you have the
blade resharpened by your STIHL
servicing dealer. An incorrectly ground
cutting blade (wrong sharpening angle,
out-of-balance) can cause operational
problems and could cause the blade to
break or fracture, resulting in severe
personal injury or death to the operator
or bystanders.
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 Mount the cutting blade (2) with the
upturned ends facing toward the
mower deck – the arrows (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)
and washer (7) for damage.
WARNING
Replace a damaged mounting screw
and washer.
N Insert the blade mounting screw (6)
with washer (7), tighten it down to a
torque of 25.8 lbf. ft. (35 Nm) and
secure with Loctite
®
243
™
or
Loctite
®
242
™
.
WARNING
To reduce the risk of injury, install the
blade mounting screw with Loctite and
tighten it down to the specified torque.
0000-GXX-2660-A0
b
a
c
0000-GXX-2661-A0
2
4
3
1
0000-GXX-2662-A0
1
0000-GXX-2663-A0
5
3
4
7
6
2