Service manual

Electrical Service Manual V4.0

1-6

CENTRAL COMMAND I

#2 Relay contact test – This test checks to make sure there is no continuity from one side of

the relay’s contact to the other. This ensures that the relay is in an open stat before applying

power to it.

Once these two relays have passed the internal test of the Curtis control the controller will

then turn on and apply power to the drive motor.

For Contactor and Relay Testing please see Chapter 11

BRUSH DECK OPERATION TROUBLE SHOOTING

Later versions of all of our scrubbers incorporated a brush deck limit switch that would

prevent the brush deck motors from turning while the brush deck is in the raised position.

These switches are in the following locations:

MACHINE SERIES & SWITCH LOCATION & NOTES

2000 Series early production:

On the right hand side of the frame at the front of the machine

Disc: The rear lip of the

2000 late production:

Mounted to the brush deck actuator

Rider Disc Scrubbers:

At front of scrub deck compartment at head of the actuator on the right hand side.

Rider Cylindrical Scrubbers

At the middle of the scrub compartment on the suspension cross beam on the right hand

side

29/35 Disk

Just left of center mounted to the rear wall of the scrub chamber.

35 Cylindrical

Far left side mounted on a ﬂange.

The switch interrupts the power from the Curtis control to the scrub deck relay when it is

depressed by the brush deck.

The brush relay is powered by the #2 relay. This conﬁguration is what makes the brushes

turn on and off when the machine starts and stops. The Model 52 has two relays, one for

the two outer brushes and one for the inner brush.