Stenner Chemical Dosing Pump Diagnostic Guide #
Overview #
The Stenner Chemical Injection Pump is an integral component of the HeadHunter TW-HMX Sewage Treatment System, providing accurate dosing of treatment chemicals required for proper wastewater processing and system performance.
If the chemical injection pump is not operating correctly, the HMX system may experience insufficient chemical dosing, poor treatment efficiency, increased maintenance requirements, or system alarms.
This troubleshooting guide is intended to assist vessel operators and technicians in diagnosing common chemical dosing issues before replacing components or requesting service.
Common Symptoms #
This guide addresses conditions including:
- Low chemical dosing.
- No chemical injection.
- Pump motor operating but not delivering chemicals.
- Air trapped in the chemical supply line.
- Intermittent dosing.
- Loss of prime.
- Empty chemical reservoir.
- Chemical feed line restrictions.
Before Beginning Troubleshooting #
Prior to diagnosing the chemical pump:
- Verify the chemical storage tank contains sufficient treatment chemical.
- Confirm all suction and discharge tubing is properly connected.
- Inspect tubing for kinks, cracks, or leaks.
- Ensure the pump has electrical power.
- Verify the HMX system is calling for chemical injection.
Many dosing problems are caused by air entering the suction line, blocked tubing, or an empty chemical supply rather than pump failure.
Common Items to Inspect #
The following should be checked during diagnosis:
- Chemical reservoir level.
- Suction tubing.
- Injection tubing.
- Pump rollers and tubing assembly.
- Check valves.
- Injection fitting.
- Electrical connections.
- Pump operation during an active dosing cycle.
Preventative Maintenance #
Routine inspection of the Stenner pump will help ensure reliable chemical delivery and reduce unexpected service interruptions.
Recommended maintenance includes:
- Regularly checking chemical levels.
- Inspecting tubing for wear or deterioration.
- Cleaning the injection point as required.
- Replacing worn pump tubes at the manufacturer’s recommended intervals.
- Verifying proper chemical flow during routine vessel maintenance.
Preventative maintenance significantly improves dosing accuracy and extends the service life of the chemical injection system.
Reference Documentation #
The following pages contain the manufacturer’s troubleshooting procedures for the Stenner Chemical Injection Pump used on the HeadHunter TW-HMX Sewage Treatment System.
Follow the diagnostic sequence provided to identify the source of low or no chemical injection before replacing components. This systematic approach helps minimize downtime and ensures proper operation of the vessel’s sewage treatment system.
East Coast Yacht Group
2955 West State Road 84
Fort Lauderdale, FL 33312
Service Department
954.530.2033
Contact our Service Department today to learn how we can help ensure safe and peak performance for your vessel.
