188Service Manual – SC5000
34 - Scrub System, Cylindrical
Functional Description
The cylindrical deck is optimal in environments where oor debris is to be expected during the cleaning
process. The cylindrical deck consists of two counter rotating cylindrical brushes for scrubbing the oor, as
well as channeling debris up and into a hopper.
The deck also includes two removable side squeegees that help keep the scrub water contained within the
path of the scrub deck, and subsequently within the rear squeegee path.
Deck Lift Actuator
The deck lift actuator controls the raising and lowering of the deck, as well as the amount of pressure the
scrub disks apply to the oor.
To extend or retract the actuator, the power module reverses polarity to the actuator. The actuator
determines how long it should run to reach full extension or retraction. It accomplishes this with a pair of
cams, limit switches, and diodes.
As each cam rotates, it opens the normally closed
circuit and stops the motor’s rotation. However each
cam is functional only for its intended direction of
rotation. This is accomplished with the diodes, which
effectively short circuit the switch for one direction
(polarity), but not the other.
In the diagram below, the clockwise cam/limit
switch is effectively short circuited by its diode when
the electrical polarity is driving the motor in the
counterclockwise direction (and vice versa for the
CCW). But the counterclockwise cam is not short
circuited, so it will open the motor circuit when the
cam lobe reaches the limit switch.
The down-limit cam isn’t adjustable, but by adjusting
the position of the up-limit cam, the actuator can
control its length of travel for the leadnut along the
leadscrew.
Diodes
Limit
Switches
Up Limit
Cam
Down Limit
Cam
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