Overview #
The Mach 5 Water Pump is designed to provide reliable freshwater delivery throughout the vessel. Proper start-up and priming are essential to ensure correct pump operation, prevent dry-run conditions, and avoid premature wear caused by trapped air within the pump or suction piping.
This procedure provides a safe, repeatable sequence for technicians and crew familiar with basic marine water pump systems.
For additional troubleshooting and maintenance information, refer to the applicable manufacturer documentation.
Before Starting #
Before operating the Mach 5 pump:
Verify:
- Freshwater supply is available.
- Pump electrical supply is ON.
- Suction and discharge plumbing connections are secure.
- No visible leaks are present.
- All fittings are properly tightened.
A loss of prime or air entering the suction side can cause poor performance, false dry-run alarms, or repeated pump shutdowns.
Mach 5 Pump Priming & Start-Up Procedure #
Step 1 – Prime the Pump #
- Locate the pump priming plug.
- Remove the priming plug.
- Fill the pump housing with approximately:
1 gallon (3.75 liters) of clean water
- Reinstall and tighten the priming plug securely.
Ensure the plug seals properly before starting the pump.
Step 2 – Begin Pump Operation #
- Open a freshwater faucet onboard.
- Turn the Mach 5 pump ON.
- Allow the pump to operate.
During initial startup, the pump may recirculate water internally while removing trapped air and completing the priming process.
Step 3 – Confirm Prime #
Allow the pump time to complete the priming process.
If the pump is not fully primed after approximately 6 minutes:
- The pump will shut down.
- The pump will attempt an automatic restart cycle three times.
- If unsuccessful, the pump will remain OFF.
To reset:
Option 1:
- Press the reset button at the control panel.
Option 2:
- Turn pump power OFF.
- Wait briefly.
- Restore power.
Repeat the priming procedure if required.
Step 4 – Verify Pressure Operation #
Once primed:
- Close the open faucet.
- Allow the pump to build system pressure.
- Confirm the pump reaches maximum pressure.
- Verify the pump shuts OFF after approximately 15 seconds.
Shutoff pressure may vary slightly depending on:
- Vessel plumbing arrangement.
- Suction lift requirements.
- System demand.
Technician Tips & Troubleshooting Notes #
Air in the Suction Line #
Air entering the suction piping is one of the most common causes of:
- Erratic pump operation.
- Loss of prime.
- False dry-run shutdowns.
- Extended priming times.
Inspect:
- Suction hose connections.
- Hose clamps.
- Fittings.
- Pump inlet connections.
Even a small suction-side leak may allow air into the system without creating a visible water leak.
Proper Priming Technique #
During initial startup:
- Allow sufficient operating time to remove trapped air.
- Do not repeatedly cycle power before the system has completed priming.
- Verify steady water flow from open faucets.
The pump must remove all entrained air from both the pump housing and suction piping for reliable operation.
Preventative Maintenance Recommendations #
To maintain reliable Mach 5 operation:
- Inspect suction connections regularly.
- Check for leaks or loose fittings.
- Keep pump area clean and dry.
- Verify normal pressure cycling.
- Address repeated dry-run shutdowns promptly.
Important Reminder #
A properly primed pump is critical for freshwater system reliability. Repeated operation without proper prime may result in reduced performance, unnecessary wear, and system faults.
This guide is intended as a supplemental Ocean Alexander Knowledge Base reference and does not replace the official Mach 5 manufacturer operating instructions.
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.
