Scrub System: Disc, Cylindrical, & Boost
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Service Manual – Focus II / Scrubtec R6 Rider Autoscrubber
Scrub System: Disc, Cylindrical, & Boost
Functional Description
The Focus machine can be configured for a variety of
different scrub deck types and sizes. Depending on the
size, the disc-type deck may have two drive motors or
three drive motors. Each type is described in greater
detail below.
Deck Lift
The deck lift mechanism and deck lift actuator control
the raising and lowering of all deck types. All deck types
and sizes mount universally to the deck lift linkage.
The raised position of the lift actuator is the same
for all deck types, and is controlled by a limit switch
inside the actuator. The operating position for the
disc and cylindrical decks is controlled via feedback of
the amperage of the brush motors. Positioning for the
boost deck does not use amperage feedback. Instead, an
extra set of position switches are located inside the lift
actuator to tell the controller when the deck is in one of
two operating positions.
Drive Motors
Unlike most other motors in the Focus system, the Brush motors are not PWM speed controlled, but are
either full-on or full-off. The primary on/off function is controlled with the brush motor contactor
(K1)
located in the main electrical panel under the operator’s seat. The output of this contactor is all-on or all-off,
but the power to the coil is PWM controlled to increase the life of the coil. At the time of the initial contact
closure, the controller provides a full PWM signal to the coil to pull the contacts closed, but then reduces the
PWM duty cycle while holding the contacts closed because less power is needed to keep them closed versus
pulling them closed.
Disc Deck
The disc deck is available in 3 sizes. The 28” and
34” decks use two drive motors and two brush discs,
and the 40” deck uses three motors and three brush
discs. The machine uses the same wiring harness
for all deck types, so it is important to program the
controller to know what type of deck is installed.
The two or three drive motors connect to their
respective brush discs through a right angle gear
boxes. The rotation direction of the individual brushes
is dictated by the rotation of the gear box, instead
of changing the electrical polarity of the motor. This
allows the motors to be connected in any fashion to
the wiring harness.
Leadscrew
Limit Switch
Access
Down Pressure
Spring
Leadscrew Nut
Up Pressure
Spring
Spring
Housing
Motor
Deck Lift
Brush Motor
(2 or 3)
Side
Squeegee
Brush
