Humboldt H-1756.4F Vibrating, De-airing Device - Manual (Page 3)

Operation
The vibratory action is started by operating the on-off switch located on the front of the
base. Start the machine by raising the bat handle on the toggle switch to the “ON”
position.
Maintenance
The machine can generally be maintained by keeping it clean, correcting any looseness
that may occur and protecting the electrical cord.