Scrub System
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Service Manual – CA90 32T
Scrub System
Functional Description
The scrub system on the CA90 32T is composed of (2) disc style brush motors. These motors rotate toward the
center of the machine to sweep solution and dirt toward the center of the squeegee path. The RIGHT motor spins
conter-clockwise, and the LEFT
motor spins clockwise. The brush motors will operate ONLY if the safety triggers
are engaged on the control housing. The machine’s Hour Meter is controlled by the brush circuit, and the meter
will only run when the brushes are running.
The motors are mounted to the brush deck. The scrub deck can be lifted and lowered to adjust head pressure
using an electric actuator. The actuator can be operated up or down anytime the machine power is ON. The
brush pressure can be monitored by the operator using the ammeter (brush pressure meter) on the control
housing.
The scrub deck is equipped with a rubber skirt to help contain the solution within the machine path.
Circuit Description
The (2) brushes are operated by using a combination of the trigger switch and the brush switch on the control
housing. Both switches must be engaged for the brushes to operate. Power is then applied to the coil of the
Brush Solenoid to supply battery power. Power flows through (2) Circuit Breakers, each brush motor having it’s
own circuit breaker. Power for the Left Brush Motor also flows through the Brush Pressure Gauge. The Brush
Pressure Gauge is basically an ammeter used to display the brush pressure to the operator.