65
c) Wheel Change
The tyres are fastened to the wheel rim to prevent them from coming loose. When the tyre is worn down, the entire
wheel has to be replaced therefore.
After loosening of the wheel nut, the wheel may be removed from the wheel axle.
Then the new wheel is plugged on so that the hexagon socket on the wheel rim‘s inside is pushed onto the wheel
tappet nut precisely.
Screw the wheel on to the wheel axle with the wheel nut removed at first. However, do not apply any force for screwing
on. This will require greater force to turn the wheel, which may damage the drive.
The wheel nut is a stop nut. When screwing on, ensue that the coloured plastic ring in the stop nut is towards
the outside.
The wheel tappet nut (2) may remain in the rim when removing
the rear wheel or detach from the wheel axle (3) when the wheel
is taken off. In this case ensure that the driving pin (4) does not
fall out and gets lost.
When the wheel is later replaced, ensure that the tappet pin (4)
is exactly in the centre of the wheel axle (3) and inserted into the
respective groove of the wheel tappet nut (2).
If the tappet pin (4) is missing, no torque can be transferred from
the motor to the wheel and the wheel will spin freely.
1
2
4
3
1
2
4
3
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