Ensure that both running wheels always move in the middle of the rails for uneven
surface.
Rails for uneven surface are recommended for all uneven oors, outdoor uneven
terrain, indoor polished oors or painting booths.
Slide the safety system tube back onto the pin, add the at washer and re-secure it
with the cotter pin.
Apply the same procedure on the other side of the lifting device.
There is no safety system on the other side, so just attach the second rail for uneven
surface to the lifting device and secure with a cotter pin.
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