Operating instructions LITTY 4you
15
18.2 Caster wheels flapping
Uncontrolled swivelling backwards and for-
wards of the caster wheels around their axes
on the caster fork (while moving) is called "flut-
tering".
If the caster wheels start fluttering, then
immediately reduce the speed you are travel-
ling 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
increasing weight of caster wheels
falling load on the caster wheels
decreasing caster length of caster wheels
The following options are available to counter-
act caster fluttering:
Fluttering can be reduced by reducing the
caster wheel diameter. This means install-
ing a small caster wheel in a different
wheel position in the caster wheel fork
(seat height thus remains the same) would
be one way of reducing fluttering. How-
ever, please note that using a smaller
caster wheel makes it more difficult to
overcome obstacles and makes tilting nec-
essary more often. The smaller the caster
wheel is, the more driving skill is required.
Another way to reduce fluttering would for
example be to use a light caster wheel with
the same diameter or, as described above,
with a smaller diameter.
It would also be possible to increase the
caster length. The caster length is the dis-
tance between the rotary axle of the caster
wheel fork projected onto the floor and the
wheel contact point. The wheel contact
point of the caster wheel trails behind the
rotary axle as it were. The caster length
has a stabilizing effect on moving in a
straight line. Increasing the caster length
can be attained by mounting the caster
wheel in a different wheel position on the
caster wheel fork (the caster wheel fork ro-
tary axle is then no longer completely at
right angles to the ground).
Figure 23: Caster length
18.3 Replacing the caster wheel forks
A distinction needs to be made between the
caster wheel forks with a bolt-on axle and
those with a quick-release axle.
18.3.1
Caster wheel fork with bolt-on axle
The
caster wheel fork with a bolt-on axle is
removed
using a wrench which is included in
the scope of delivery. This wrench is inserted
into the two holes on the protective cap on the
caster wheel bearing block and turned anti-
clockwise. The caster wheel fork needs to be
held still. Once the cap has been completely
removed, the caster wheel fork can be pulled
out.
Rotary axle for
caster wheel
Caster length
Wheel extension
point
