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.
Why is my Danfoss 40 M46 Tandem Water Pump system generating heat due to SCR valves?
A partially activated SCR valve or SCR valves with relief settings that are too low may result in heat generation within the system. Verify that the SCR valve is seating properly and is at the correct relief setting. Repair or replace it as necessary.
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.
What to do if the heat exchanger is not sufficiently cooling my Danfoss 40 M46 Tandem system?
If the heat exchanger isn't sufficiently cooling the system, check the air flow and input air temperature for the heat exchanger. Clean, repair, or replace the heat exchanger as necessary.
Why is there aeration of oil in my Danfoss 40 M46 Tandem Water Pump?
Air in the system decreases the efficiency of the units and controls. Locate where air is entering the system and repair the leak. Also, check that the inlet line is not restricted and is the proper size.
How to fix low oil level in Danfoss Water Pump reservoir?
A low oil level can lead to cavitation. To resolve this, fill the reservoir.
What to do if the oil level is low in the Danfoss Water Pump reservoir?
If the oil level in the reservoir is insufficient, the system's cooling demands won't be met. Fill the reservoir to the proper level with clean hydraulic oil.
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 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.
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.
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.
To Next Page
