Usage instructions SPEEDY 4all & 4you & 4teen
32
opened) and a green marking on the other side
(quick release axle locked). The pin can be
pushed using the ball of your hand in the direc-
tion of the middle of the drive wheel and there-
by the quick release axle opened or closed.
Figure 77: Tetra Clip with locked quick release axle
Figure 78: Tetra Clip with opened quick release
axle, drive wheel can be removed
21.2 Checking and adjusting the wheel
tracking of the drive wheel
The following instructions are intended
for and may only be carried out by a rehabilita-
tion specialist dealer or PRO ACTIV
Well adjusted wheel tracking significantly im-
proves the easy running characteristics of the
product. To
check
the tracking, proceed as
follows:
Position the product on a level surface and
secure the product against rolling away.
Measure the axle heights (from the ground to
the drive wheel axle) and write this dimension
onto both tyres at front and back.
Figure 79: Drawing the axle height on the front and
back of both tyres
Afterwards measure the distance between the
drive wheels front and back at the height of the
axles along the markers. Ideally, the distance
between the two drive wheels should be the
same size at the front and back. In general it
can be said that the distance between the drive
wheels at the front may not be larger than at
the back. Apart from that, the distance at the
back may not be more than 5 mm larger that at
the front. If this is not the case, the wheel
tracking needs to be corrected.
Figure 80: Distance between the markers on the
tyres (at axle height), back
•
Axle height
Markings
Distance
Drawing the axle height onto tyres
Red marking = drive wheel can
be removed
Green marking = drive wheel is
locked in place on the product
