Solution System200Service Manual – Advance 7765 / Nilfisk CR1500MaintenanceWarning! Before performing any machine maintenance, make sure the key switch is off, the keyis removed from the machine and the parking brake is engaged.Solution TankTo clean the solution tank:1. Lift the solution tank lid (cover).2. Position the drain hose over a drain, then remove the drain plug assembly.3. Flush all deposits from the tank.4. Flush the liquid level switch and the inlet strainer.5. Replace and tighten the drain plug assembly.Note: The inlet strainer is threaded into the bottom of the tank and is designed to be removed andinstalled with an oil filter wrench.Detergent System (ESP/Recycle Option Only)To clean and flush the detergent system:1. Rinse the detergent tank with clean water.2. Pour clean water into the detergent tank.3. Set the DETERGENT FLOW KNOB to MAX and run the detergent and solution systems to purge thedetergent pump and lines.TroubleshootingProblem Cause CorrectionNo or inadequatesolution flow to thescrub brushes.Low solution level in solutiontank.Check the solution level in the tank and fill asnecessary.Inlet strainer dirty orplugged.Clean or replace the inlet strainer.Plugged solution deliveryhose(s).Check and clean the solution delivery hoses asnecessary.Ball valve not operatingcorrectly.Check the function of the ball valve and the linkageadjustment and repair/replace as necessary.Solution valve not operatingcorrectly (Solution Off inNeutral option only).• Check the solenoid wiring for problems(ORN and WHT wires).• Check the solenoid coil resistance. If not 13 ohms±10%, replace.
