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7.2 Cleaning/Replacing the bottom trolley wheels
If the machine often changes direction unexpectedly, it may be due to
the bottom trolley wheels being jammed. Please clean it as follows:
a. Position the device securely with its bottom facing upwards.
b. Unscrew the bottom trolley wheels.
c. Rinse away any dirt, sand, or debris from the inner crevices of the
wheels. Be careful not to lose any internal parts, such as springs.
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