To judge whether a Danfoss 90 series plunger pump can work normally, the following factors should be considered:

Proper Installation: The pump should be installed properly, with proper alignment and support, to ensure it runs smoothly and without excessive vibration.

Adequate Oil Supply: The pump requires an adequate oil supply to operate properly. Check the oil level regularly to ensure that the oil is clean and free from contamination.

Proper Pressure and Flow: A pump should be able to generate the required pressure and flow for its intended specific application. Check pressure and flow regularly to make sure they are within the correct range.

No Unusual Noises: The pump should run quietly without any unusual or excessive noise. If you hear any unusual sounds, investigate the cause and correct the problem as soon as possible.

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No Leaks: The pump should not leak oil or any other fluid. Check all connections and seals regularly to make sure they are tight and properly sealed.

Proper Maintenance: Pumps should be maintained regularly according to the manufacturer's recommendations. Regular maintenance will keep the pump running at peak efficiency and reliability.

No overheating: The pump should not overheat during operation. Check the temperature of the pump regularly and investigate any unusual temperature rise.

By paying attention to the above factors, you can judge whether a Danfoss 90 series plunger pump is working normally. If you notice any issues, it's important to fix them as soon as possible to prevent further damage or downtime.

In addition to the above factors, it is also important to pay attention to the performance and efficiency of the pump. This can be measured by factors such as the pump's overall efficiency, power consumption and volumetric efficiency.

Periodic monitoring and adjustments may be required to ensure the pump is operating at peak efficiency. This may include adjusting pressure and flow rates to ensure they are within optimal ranges, as well as cleaning or replacing any components that may be reducing efficiency.

It's also important to be aware of any changes in the pump's performance or operation, as this could indicate a problem. For example, a sudden increase in noise or vibration may indicate that a component is worn or malfunctioning.

By paying attention to the above factors and carrying out regular inspections and maintenance, you can ensure that your Danfoss Series 90 piston pump works properly and efficiently.

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In addition, it is also important to regularly inspect and maintain the following components of Danfoss 90 series piston pumps:

Plungers and Cylinders: Inspect the plungers and cylinders for signs of wear, corrosion, or damage. Replace these components if necessary to prevent leaks or performance degradation.

Seals and Gaskets: Inspect all seals and gaskets for signs of wear, damage, or leaks. Replace any worn or damaged seals or gaskets.

Filters: Regularly check and replace the pump's filters to prevent contaminants from entering the pump and causing damage or reducing efficiency.

Bearings: Inspect bearings for wear or damage and replace bearings if necessary to prevent vibration or degradation.

Valves: Check the pump's valves for proper operation and replace them if necessary to ensure proper flow and pressure.

Couplings: Inspect the pump's couplings for wear or damage and replace them if necessary to prevent vibration or performance degradation.

Hoses and Fittings: Inspect all hoses and fittings for signs of wear, damage, or leaks. Replace any worn or damaged parts to prevent leaks or loss of performance.

By regularly inspecting and maintaining these components, you can ensure that your Danfoss Series 90 piston pumps are functioning properly and efficiently, with minimal risk of downtime or costly repairs.