The Tennant floor scrubber is designed to deliver a steady spray of cleaning solution while scrubbing floors. When the unit stops putting out water, productivity drops and floors may not clean effectively. This guide outlines common causes, quick checks, and step-by-step fixes to help technicians and operators restore proper water flow safely and efficiently.
Identify The Symptom And Safety First
Before troubleshooting, power off the machine and remove the battery or unplug (if applicable) to prevent accidental startup. Check for visible leaks around the solution tank, hoses, and the spray nozzles. Note whether the sprayer is completely dry or if a partial spray is observed. Record any error codes or warning lights on the display, as they guide diagnosis.
Check The Solution Tank And Fill Level
A common reason for no water spray is an empty or improperly seated solution tank. Ensure the tank is full with the correct cleaning solution and that the cap is tightened securely. Inspect the tank’s overflow tube and fill line for kinks or damage. If the machine uses concentrate, verify the correct dilution ratio is set and the refill indicator is not falsely signaling a full tank.
Inspect The Spray System For Blockages
Clogs in the spray line, nozzle, or spraybar prevent water from reaching the floor. Disconnect the spray hose from the pump and inspect for debris, sediment, or hardened solution. Remove any obstruction and flush the line with clean water. Check the spray nozzles for mineral buildup; use a small brush or pin to clear blocked orifices. Reassemble securely and test spray coverage after reassembly.
Evaluate The Water Pump And Pump Belt
The pump is the heart of water delivery. If the pump motor runs but water is not delivered, the pump may be clogged, worn, or slipping. Listen for unusual sounds and check for overheating. For belt-driven models, inspect the pump belt for tension and wear; a loose or worn belt reduces flow. Replace worn belts and ensure correct tension per the user manual. After service, prime the pump if required and run a short test spray.
Check The Filtration And Debris Screens
Dirty filters or screens can restrict flow. Locate the intake screen and any inline filters in the solution system. Remove and clean them with warm water, ensuring no fibers clog the passages. Reinstall securely. If filters are damaged or excessively restricted, replace them. Regular maintenance of filters helps prevent future spray failures.
Test The Float Switch And Level Sensors
Some Tennant models use float switches or electronic sensors to regulate solution flow. A stuck or maladjusted float can prematurely stop spray. Gently actuate the float by hand to confirm it moves freely. If the sensor is suspected, consult the service manual to test with the appropriate diagnostic procedure. Faulty sensors may require recalibration or replacement by a qualified technician.
Check Electrical Connections And Controls
Loose or corroded connectors can interrupt power to the pump or solenoid. Inspect visible wiring for damage and reseat all connections. If the machine has a spray solenoid valve, confirm it engages when the trigger is pressed. A defective solenoid or control board can prevent water release; diagnosis and replacement should be performed by trained staff or a technician.
Evaluate The Solution Lines For Leaks Or Air Locks
Air pockets in the solution line or leaks from fittings reduce pressure and spray performance. Inspect all fittings, clamps, and hoses for tightness and cracks. Tighten or replace as needed. If an air lock is suspected, disconnect the line at the pump, bleed the line by loosening the fitting slightly to release trapped air, then retighten securely.
Run A Systematic Test With The Correct Chemical
Use the recommended cleaning solution for the model and ensure dilution is correct. Some chemicals can cause foaming or residue that clog lines; rinse with clean water to verify spray after testing. Confirm that the spray timer or dose cycles are functioning if the model includes automated dosing. Document test results for maintenance records.
Maintenance Schedule To Prevent Recurrence
- Daily: Check fill level, visually inspect hoses, and clear visible debris from the spray bar.
- Weekly: Clean filters and screens; inspect the spray nozzle and lines for mineral buildup.
- Monthly: Inspect the pump, belt tension, and electrical connections; perform a full spray test.
- Annually: Replace worn pumps, seals, hoses, and any aging components per the manufacturer’s guidelines.
Common Troubleshooting Scenarios And Quick Fixes
| Symptom | Likely Cause | Recommended Action |
|---|---|---|
| No water spray at all | Empty tank or pump not primed | Refill tank; prime pump as per manual |
| Weak spray or inconsistent coverage | Partial blockage or worn nozzle | Clean spray nozzle; inspect spray line for kinks |
| Pump runs but no flow | Blocked intake or air lock | Clean filters; bleed air from lines |
| Leaking around fittings | Loose connections or damaged hoses | Tighten clamps; replace damaged hoses |
| Float switch not triggering | Stuck float or sensor fault | Inspect and replace sensor if needed |
When To Call For Service
If basic troubleshooting does not restore water spray, the issue may involve internal seals, pump impeller wear, or electronic control boards. In such cases, contact Tennant support or a certified service technician. Document model number, serial, recent maintenance, and any error codes to speed diagnosis.
Preventive Tips For Optimal Performance
Regular maintenance keeps the scrubber ready for use. Use the recommended cleaning solution, avoid mixing incompatible chemicals, and flush lines after heavy use. Store the machine with the solution system drained if it will be idle for an extended period. Keeping a maintenance log helps identify recurring issues early.