Nilfisk-Advance America GB 1133 - Manual (Page 14)

11 Cleaning the filter
Nilfisk-Advance systems are fitted with a device for cleaning the main filter. First of
all, switch the machine off. Then move the shaker handle placed at the container
vigorously with a push-pull movement.
Extractors
When the dust-producing system is shut down automatically, it needs to be switched
off manually before cleaning the filter or replacing the dust bag. Otherwise, an
hazardous situation could occur if after these works, the dust-producing system
restarts automatically.
After the main filter has been cleaned, the manometer’s pointer must return to the
green area or the red warning light has to go out. Otherwise, the main filter has to be
replaced.
K1 vacuum cleaners
When the pointer is still in the red area or the warning light does not go out, the
prefilter has to be replaced as well.