Caster Wheels Flapping - ProActiv SPEEDY F4 Operating Instructions Service Booklet

Operating instructions SPEEDY F4 & F2
Aluminium axle
Figure 86: Caster wheel axle with aluminium axle
Spacer
Figure 87: Spacer on the caster wheel
When mounting the caster wheel, position
the caster wheel with its spacers in the caster
wheel fork, hold it in position and insert the M6
axle fixing screw with its washer from the
outside of the product to the inside through the
axle of the caster wheel. Now attach the
washer and the M6 nut (AF 10 mm) from the
other side. The tightening torque of the axle
fixing screws (AF 4 mm) is 7 Nm.

23.2 Caster wheels flapping

Uncontrolled swivelling backwards and
forwards of the caster wheels around their
axes on the caster fork (while moving) is
known as "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 where caster wheel fluttering
starts, is reduced by:

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 generally:

When equipping the product with angle-
adjustable caster-wheel bearing blocks,
the fluttering can be reduced by reducing
the diameter of the caster wheels. This
means installing 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.
However, please note that using a smaller
caster wheel makes it more difficult to
overcome obstacles and makes tipping
necessary more often. The smaller the
caster wheel is, the more driving skill is
required.

Another way to reduce the fluttering is the
use of a lighter caster wheel of the same
diameter, or, as previously described,
with a smaller diameter (smaller diameter
only possible where the product has been
fitted with angle-adjustable caster-wheel
bearing blocks).
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