SCRUB SYSTEM 33Service Manual – Advenger, 2800ST, 3800ST, BR 755, BR 855
SCRUB SYSTEM
Advenger / BR 755, 855 Disc and Cylindrical - pressing the Scrub On button with the seat switch closed causes the scrub deck and squeegee
to drop. The control board provides 24V to the deck lift actuator M4; this signal is DVM measureable for 3 seconds and then becomes a pulsed
signal while the deck is down. Pressing the drive pedal forward causes the brush and vacuum contactors K2 and K1 to energize. The 24V brush
and vacuum motors M7, M8, M5, (M6) turn on; the pulsed solution solenoid L1 and chemical pump M2 turn on. Combined brush motor current is
monitored via the YEL/VIO sense wire. Reversing the drive pedal turns off the solution solenoid and chemical pump, but the deck remains down
and the brush motors stay on (for double scrub). Because multiple systems are engaged via one button, a further summary is provided in the
section “Understanding Control of Squeegee, Scrub, and Recovery Systems via Modes.”
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