25TS 410, TS 420
5.4 Test sequence
Sequence Actual condition Possible causes Remedy
Radial truth of running:
Visual inspection
Spindle (shaft)
Wear marks or scoring
around the mount for the
cutting wheel
Operation with loose
fastening screw, use of the
wrong cutting wheels
(mount dia. > 20 mm)
Replace spindle (shaft),
use correct cutting
wheel
Axial truth of running:
Axial truth of running is
tested with a
STIHL test wheel or
diamond abrasive wheel
(on 130 mm diameter)
Axial runout
<
0.15 mm
> 0.15 mm
Damage or unevenness in
the mating faces of the
thrust washers (particularly
the inner thrust washer),
mating faces are not plane,
use of parts which are not
original STIHL parts
Dirt, incorrectly fitted thrust
washers or cutting wheel,
use of force when cutting or
during transport
None
Replace the thrust
washers
Spindle (shaft) damaged Incorrect handling, use of
force
Replace spindle (shaft)
Tangible radial backlash in
the bearing seat → spindle
bearing faulty
Grooved ball bearings
damaged by dust and/or
bearing seat worn at the
spindle
Replace spindle and
grooved ball bearings
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