46Service Manual – SC900 30 - Solution System
No Solution Flow
• Make sure the solution shutoff valve is open.
• For a non-EcoFlex machine, make sure the solution cable is connected to the valve and moves through its
full cycle as the solution lever is moved.
• Inspect and clean the solution Filter.
• Inspect the function of the solution solenoid as described in the “Scrub System, General” on page 45
• With the solution solenoid disassembled from the step above, inspect the valve body for foreign materials.
• If the brush motors are active, then you know the drive controller is not the cause.
• For non-EcoFlex machines, make sure the jumper is present on the electrical connector under the solution
panel.
• Test the solenoid itself by applying battery voltage to the terminals.
• For EcoFlex machines, if the solenoid itself is functional, and the brush motor runs, then the detergent
module is likely at fault.
No EcoFlex Detergent Flow
• Inspect the function of the detergent pump as described in the “Scrub System, General” on page 45. If
the pump does not appear to be functioning, check the polarity of the wires.
• Verify the function of the pump by connecting it to the battery and listening for the plunger to move.
• If the pump itself is functional, and the brush motor runs, then the detergent module is likely at fault.
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