Mowing Blade Maintenance; Removing And Installing The Mowing Blade; Checking The Balance Of The Blade; Sharpening The Mowing Blade - Stihl RME 545 Instruction Manual

12.5 Mowing blade maintenance

Maintenance interval:
Before each use
Risk of injury!
Blades are subjected to differing
degrees of wear depending on the
location and duration of use. If you
use the machine on sandy ground
or use it frequently under dry
conditions, the blade will be
subjected to greater loads and will
wear more quickly than the
average. A worn blade may break
off and cause serious injuries. The
instructions for blade maintenance
must therefore always be observed.
● Tilt the mower upwards into the
cleaning position. ( 12.2)
● Clean mowing blade (1).
● Check the blade thickness A at
several points using a slide calliper. In
particular, measure in the area of the
blade wings.
A > 2 mm
● Place a ruler (2) against the front blade
edge and measure permissible
grinding B.
B < 5 mm
The blade must be replaced,
– if it is damaged (notches, cracks),
– if the measured values are achieved at
one or more points or are outside the
permissible limits.
If the multi-blade available as a special
accessory is installed on the lawn mower,
different wear limits apply (see instruction
manual for accessory).
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12.6 Removing and installing the
mowing blade
19
Removing:
● Use a suitable wooden block (1,
approx. 60x60 mm) to counterhold
blade (2).
● Unscrew blade fastening screw (3)
using an A/F 24 spanner.
● Remove blade (2).
Installing:
Risk of injury!
The blade (2) must only be installed
as shown. The curved wings must
point upwards.
Observe the specified torque when
tightening the blade fastening
screw, as the secure attachment of
the cutting tool depends on this.
Additionally secure blade fastening
screw (3) with Loctite 243.
Renew blade fastening screw (3)
each time the blade is replaced.
● Clean the blade contact surface and
blade bushing.
● Check the balance of the blade.
( 12.7)
● Install blade (2) with the curved wings
pointing upwards (towards the
machine).
● Use a suitable wooden block (1,
approx. 60x60 mm) to counterhold
blade (2).
● Install blade fastening screw (3) and
tighten.
Tightening torque:
15 - 20 Nm
12.7 Checking the balance of the
blade
20
21
● Remove the blade. (
● Guide screwdriver (1) through central
bore (2) of blade (3) and align the
mowing blade horizontally.
If the blade is properly balanced it will
remain in this horizontal position.
● If the blade leans to one side, re-
sharpen this side until the blade is
evenly balanced. (

12.8 Sharpening the mowing blade

STIHL recommends having the mowing
blade sharpened by a technician.
Operation of the machine is impaired in the
case of an incorrectly sharpened blade
(incorrect sharpening angle, imbalance
etc.).
Sharpening instructions:
● Remove the mowing blade. (
● Cool the mowing blade when
sharpening, e.g. with water. The blade
must not be allowed to display blue
colouring, as this would reduce its
cutting quality.
● Sharpen the blade evenly to prevent
vibrations due to imbalance.
● Observe sharpening angle of 30°.
● After sharpening, remove any
sharpening burr at the cutting edge
using fine sandpaper if necessary.
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12.6)
12.8)
12.6)
0478 121 9910 A - EN