201Service Manual – SC5000
38 - Squeegee System
Functional Description
The squeegee tool collects wastewater from the
oor for the recovery system to lift the water
into the recovery tank. The oor squeegee is
wider than the path of the scrub deck to ensure
collection of all wastewater from the perimeter
of the scrubbing area. The squeegee also pivots
to the side to permit operation near walls and
to keep the squeegee within the scrubbing path
while turning the machine.
Squeegee Lift Actuator
The squeegee lift actuator operates on an offset
arm that raises the squeegee assembly. When the
actuator retracts, the arm pivots out of the way and
allows the squeegee to lower. When the actuator is
extended, the arm pivots the other way and raises
the squeegee.
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.
M
CW CCW
Diodes
Limit
Switches
Up Limit
Cam
Down Limit
Cam
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