43Service Manual – SC900
30 - Solution System
Functional Description
The SC900 machine has a 29.5-gallon (112 liter) solution tank incorporated into the main body of the
machine. A clear tube on the right side of the machine below the ll cap serves as a water level indicator
for the tank. At the outlet of the solution tank, under the machine, is a manual shutoff valve followed by a
serviceable solution lter that prevents debris from entering the rest of the solution system.
Non-Detergent Models
All machines use gravity feed and a solution
solenoid to provide solution to the scrub deck. For
non-detergent machines, the ow rate of solution
is controlled mechanically with a cable connected
between the solution lever, down to the solution
shutoff valve. The solution solenoid is either all-
on or all-off, and is controlled by the same circuit
that activates the brush motors. A circuit jumper
replaces the connector where the optional EcoFlex
control board connects in the solution panel.
For the solution circuit to be active, the machine
must be in motion, and the scrub brushes be active.
When the machine is in motion, the Curtis drive
controller makes the Brake- output equal to battery
negative. This passes through the K1 relay, through
the brush switch (foot lever), through the jumper
(non-EcoFlex), and energizes the solution solenoid.
The solution solenoid receives 36-volt, non-PWM
(Pulse Width Modulated) power, to be either all-on
or all-off.
BLK
PNK/WHTVIO
VIO/WHT
PNK/BLU
VIO/GRN
VIO
PNK
PNK
S1
SW, SPST KEY
S4
SW, BRUSH
RELAY, LVC
1
2
3
4
5
6
CURTIS 1228
KSI
5
BRAKE-
6
BRAKE+
14
D2
K1 RELAY, LVC
BATTERY GAUGE WITH HOURMETER
FET DRAIN
3
B-
4
L1
COIL, SOLENOID
1 2
D1
36 VDC
+ -
K2
COIL, BRUSH
K1
JUMPER
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