Operating instructions LITTY 4you
13
17.2 Checking and adjusting the wheel
tracking of the drive wheel
Well adjusted wheel tracking significantly im-
proves the easy running characteristics of the
product. To
check
the tracking, proceed as
follows:
Position the wheel chair on a flat surface and
apply the parking brake on both sides.
Measure the axle heights (from the ground to
the drive wheel axle) and write this dimension
onto both tyres at front and back.
Figure 16: 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 dis-
tance 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 17: Distance between the markers on the
tyres (at axle height), back
To
adjust the track
proceed as follows:
1. Loosen the aluminium locking nuts on both
sides (AF 41 mm).
Figure 18: Drive wheel bushing and aluminium,
locking nut, product view from below
2. Set the tracking correctly again by turning
the drive wheel bushing (AF 22 mm). Here
it can be said that: If you turn the drive
wheel bushing in the direction of travel, the
track at the front will become more narrow.
If you turn it against the direction of travel,
it moves in the opposite direction.
3. Make sure that the distance at the front to
the frame on the right and left is the same.
Figure 19: Distance at the front to the frame
4. Measure the distance between the drive
wheels at the front and back again at the
axle height (along the markers) so that the
distance between the rive wheels is not
any larger at the front than at the back.
Apart from that, the distance at the back
•
Axle height
Drawing the axle height onto tyres
Distance at
front to frame
the same size
on both sides
Markings
Distance
Drive wheel bushing
Aluminium locking nuts
