How to troubleshoot the filter bypass indicator switch on a Danfoss Water Pump?
The filter switch may be bad. Check or replace the filter switch. Add a gauge to the filter bypass port to verify proper fluid flow and verify switch operation by measuring resistance: open resistance=510 ohms, closed resistance=122 ohms.
What to do if my Danfoss Water Pump is receiving a faulty input control signal?
A faulty control signal is being received at the pump. Verify that the input signal being received is correct and identical in both directions. Adjust, clean, repair, or replace the control module as necessary. This could be due to binding or broken linkage (MDC), a faulty or inadequate electrical signal (EDC), or blocked or incorrectly orificed control lines (HDC).
What to do if SCR valves are malfunctioning in Danfoss Water Pump?
If the SCR valves are malfunctioning or improperly set, verify that they are operating properly and repair or replace them as necessary.
What to do if Danfoss Water Pump control is damaged?
A damaged or biased pump control may be sending a signal commanding the pump to stroke only in one direction. Verify that the pump’s control is functioning properly. Repair or replace it as necessary.
Why Danfoss 40 M46 Tandem control operates pump in one direction only?
The control coil may have failed. Measure resistance at coil pins. Resistance should be 14.20 ohms (24V) or 3.66 ohms (12V) at 20°C [70°F]. Replace coil.
What causes erratic pump function in Danfoss 40 M46 Tandem Water Pump?
A bad electrical connection to the pump can cause erratic pump function. Disconnect the connection, check the wires, and reconnect them.
What to check if charge pressure is low in neutral in Danfoss 40 M46 Tandem?
Charge pressure may be insufficient to recharge the system loop. Inspect the charge pump for damage and verify that the charge pressure relief valve is at the proper setting. Repair or replace it as necessary.
What to do if the charge pump is damaged in a Danfoss 40 M46 Tandem Water Pump?
If the charge pump is damaged or has been installed with the incorrect rotational orientation, verify that the charge pump is in good working order and that it is correctly installed. Repair or replace it as necessary.
What causes unusual noise from charge or system relief valves in a Danfoss 40 M46 Tandem?
Unusual noise may indicate sticking valves or possible contamination. Clean or replace the valves and test the pump. It may also be a normal condition.
How to reduce high pump inlet vacuum in a Danfoss Water Pump?
High inlet vacuum causes noise and cavitation. Check that the inlet line is not restricted and is the proper size. Also, check the filter and bypass valve.
General| Brand | Danfoss |
|---|---|
| Model | Series 40 M46 Tandem |
| Category | Water Pump |
| Language | English |
General safety warnings including machine movement, solvents, fluid pressure, personal, and hazardous material.
Recommendations for maintaining fluid and filter for optimum pump life and preventing failure.
Step-by-step guide for initial pump startup, including priming and running checks.
Shows port identifiers, sizes, and gauge locations for pressure testing.
Safety warnings related to high inlet vacuum and contamination during troubleshooting.
Identifies causes and actions for system noise or vibration issues.
Identifies causes and actions for system overheating.
Lists potential issues and solutions for pumps not operating in one or either direction.
Procedure to check and adjust the charge pressure relief valve.
Procedure for adjusting the displacement limiter and associated data.
Procedure to adjust the pump to mechanical neutral.
Procedure for adjusting servo neutral settings for correct operation.
Procedure to adjust MDC bracket for neutral position.
Procedure to adjust EDC/HDC control to neutral.
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