Maintenance; Repairing - Stihl RM 448.1 VC Instruction Manual

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16 Maintenance

16.1 Maintenance Intervals
Maintenance intervals are dependent on the
ambient conditions and the working conditions.
STIHL recommends the following maintenance
intervals:
Engine
► Maintain the engine as described in the engine
instruction manual.
Lawn mower
► Have the lawn mower inspected annually by a
STIHL specialist dealer.
16.2 Removing and Attaching the
Blade
16.2.1 Removing the Blade
► Stop the engine.
► Detach the spark plug socket.
► Upend the lawn mower.
► Block blade (1) using a piece of wood (2).
► Unscrew bolt (3) and remove together with
washer (4).
► Remove blade (1).
► Discard bolt (3) and washer (4).
Use a new bolt and washer to attach blade (1).
16.2.2 Attaching the Blade
► Stop the engine.
► Detach the spark plug socket.
► Upend the lawn mower.
► Place new washer (4) on new bolt (3).
► Apply Loctite 243 thread locker to the thread
of bolt (3).
34
► Position blade (1) so the raised areas on the
contact area engage in the notches in
blade (1).
► Screw in bolt (3) together with washer (4).
► Block blade (1) using a piece of wood (2).
► Tighten bolt (3) to 65 Nm.
16.3 Sharpening and Balancing the
Blade
Sharpening and balancing the blade correctly
requires a lot of practice.
STIHL recommends having the blade sharpened
and balanced by a STIHL specialist dealer.
WARNING
■ The cutting edges of the blade are sharp. This
may result in the user cutting themselves.
► Wear protective gloves made from resistant
material.
► Stop the engine.
► Detach the spark plug socket.
► Upend the lawn mower.
► Remove the blade.
► Sharpen the blade. Observe the sharpening
angle and cool the blade,
Bluing of the blade during sharpening is not
permitted.
► Attach the blade.
► If anything is unclear: consult a STIHL special‐
ist dealer.

17 Repairing

17.1 Repairing the Lawn Mower
The user should not repair the lawn mower or
blade themselves.
► If the lawn mower or blade is damaged: do not
use the lawn mower or blade and consult a
STIHL specialist dealer.
► If warning signs are illegible or damaged: have
the warning signs replaced by a STIHL spe‐
cialist dealer.
16 Maintenance
19.2.
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