Ryobi 3302H Operation Manual page 194

Chapter 3 Periodic Maintenance
2) Cleaning the air pump filter
A
WARNING
Mount the cover removed in place after cleaning. Failure to follow this instruction may result in a serious
injury.
3) Cleaning the water fountain
Maintenance Edition - 28
If the pump filter is dirty, the vacuum force of the pump will be lowered.
Take out the filter and remove any dirt and foreign particles on the filter,
and dip it in cleaning solution.
When the vacuum force of the pump is still low even after cleaning it,
please replace the filter with a new one.
Foreign particles will accumulate in the water fountain. Remove any
foreign particles in the water fountain.
Close the ON/OFF valve of the flow hose on the dampening solution
cooling/circulation device to drain the dampening solution in the water
fountain.
After the cleaning, be sure to open the ON/OFF valve.