Operating instructions SPEEDY 4all & 4you & 4teen
30
Figure 76: M6 axle fixing screw on caster wheel axle
Figure 77: Caster wheel with aluminium axle
Now you can see the aluminium axle with a
hexagon socket (AF 4 mm). This hexagon
socket is used to fix the axle in place, while the
second axle fitting screw (AF 4 mm) is
unscrewed. To do this, insert an Allen key
(AF 4 mm) into the hexagon socket on the
aluminium axle and hold it still. At the same
time, unscrew the remaining M6 axle fixing
screw (AF 4 mm) on the other side.
Now the caster wheel can be removed from
the fork. One spacer each is mounted to the
right and left on the caster wheel that you are
now able to remove in order for it to be reused
later when reinstalling the new caster wheel.
Figure 78: Spacer on the caster wheel
When
attaching
the caster wheel, proceed as
described above in reverse order. Please
make sure that the spacers on the right and left
on the caster wheel are re-installed in the
caster fork before assembly. The tightening
torque of the axle fixing screws (AF 4 mm) is 7
Nm. We recommend that you only use screws
with polymer dry locking coating. Screws
without polymer dry locking coating must be
secured with screw locking fluid.
22.2 Caster wheels flapping
Uncontrolled swivelling backwards and
forwards of the caster wheels around their
axes on the caster fork (while moving) is called
"fluttering".
If the caster wheels start fluttering, then
immediately reduce the speed you are
travelling at to avoid the caster wheels
jamming sideways so as to avoid the risk of
falling over.
The speed limit at which a caster wheel can
start fluttering, reduces with:
increasing size of the caster wheels
increase weight of the caster wheels
falling load on the caster wheels
decreasing caster length of caster wheels
The following options are available to
counteract caster fluttering:
Fluttering can be reduced by reducing the
caster wheel diameter. This means
installing a small caster wheel in a different
wheel position in the caster wheel fork
(seat height thus remains the same) would
Aluminium axle with
hexagon socket
Spacer
M6 axle fixing screws
