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How to troubleshoot a manual piston paste filling machine when it doesn't fil...

2025-08-05

A manual piston paste filling machine is a reliable and commonly used piece of equipment in various industries, especially for filling viscous substances like pastes, creams, and gels. However, like any mechanical device, it may encounter issues from time to time, resulting in improper filling. As a supplier of manual piston paste filling machines, I understand the frustration that comes with such problems. In this blog post, I'll share some practical troubleshooting steps to help you get your filling machine back on track.

1. Check the Power Supply and Connections

The first step in troubleshooting any electrical equipment is to ensure it has a proper power supply. Make sure the machine is plugged in correctly and that the power switch is turned on. Check for any loose or damaged electrical connections. A loose wire can disrupt the power flow to the machine's components, causing it to malfunction. If you find any damaged wires, they should be replaced immediately by a qualified electrician.

2. Inspect the Piston and Cylinder

The piston and cylinder are the heart of a manual piston paste filling machine. Over time, they can wear out or become clogged with paste residues. To check the piston and cylinder:

Disassemble the Piston Assembly: Follow the manufacturer's instructions to carefully remove the piston from the cylinder. This usually involves loosening a few bolts or screws.
Examine for Wear and Tear: Look for signs of excessive wear on the piston and cylinder walls. If the piston has become too thin or the cylinder walls are scratched, it may cause leakage or inconsistent filling. In such cases, the worn parts should be replaced.
Clean the Piston and Cylinder: Use a suitable cleaning agent to remove any paste residues from the piston and cylinder. Make sure to clean all the crevices and grooves thoroughly. After cleaning, dry the parts completely before reassembling them.

3. Check the Valves

Valves play a crucial role in controlling the flow of paste in a manual piston paste filling machine. There are typically two types of valves: the intake valve and the discharge valve.

Inspect for Blockages: Check the valves for any blockages caused by dried paste or foreign particles. A blocked valve can prevent the proper flow of paste, resulting in under - filling or over - filling. Use a small brush or a needle to clear any blockages.
Verify Valve Operation: Make sure the valves open and close smoothly. If a valve is sticking, it may need to be lubricated or replaced. You can test the valve operation by manually operating the filling machine and observing the flow of paste.

4. Examine the Hopper

The hopper is where the paste is stored before filling. If the hopper is not functioning properly, it can affect the filling process.

Check for Clogs: Ensure that there are no blockages in the hopper or the outlet pipe. A clogged hopper can prevent the paste from flowing freely into the piston chamber. Use a spatula or a rod to clear any blockages.
Verify the Hopper Level: The level of paste in the hopper should be maintained at an appropriate level. If the hopper is too low, it may cause air to be drawn into the filling system, resulting in inconsistent filling. On the other hand, if the hopper is overfilled, it can cause spillage and mess.

5. Adjust the Filling Volume

If the filling machine is not filling the correct volume of paste, you may need to adjust the filling volume settings.

Refer to the Manual: Consult the machine's manual to find out how to adjust the filling volume. This usually involves adjusting a screw or a knob on the machine.
Calibrate the Machine: To calibrate the filling volume, use a measuring cup to collect the filled paste. Compare the actual volume with the desired volume. If there is a significant difference, make the necessary adjustments until the correct filling volume is achieved.

6. Check the Seals and Gaskets

Seals and gaskets are used to prevent leakage in a manual piston paste filling machine. Over time, they can wear out or become damaged.

Inspect for Leakage: Check for any signs of leakage around the seals and gaskets. If you notice any leaks, it may indicate that the seals or gaskets need to be replaced.
Replace Worn Seals and Gaskets: Use the appropriate replacement parts to replace the worn seals and gaskets. Make sure to install them correctly to ensure a proper seal.

7. Evaluate the Paste Consistency

The consistency of the paste can also affect the filling performance of a manual piston paste filling machine.

Check the Viscosity: If the paste is too thick, it may be difficult for the machine to pump it through the system. On the other hand, if the paste is too thin, it may cause leakage or inconsistent filling. Adjust the viscosity of the paste if necessary.
Avoid Air Bubbles: Air bubbles in the paste can cause inconsistent filling. To remove air bubbles, you can use a degassing machine or let the paste sit for a while to allow the bubbles to rise to the surface.

8. Consider Upgrading to an Automatic Machine

If you find that your manual piston paste filling machine is constantly giving you problems, it may be time to consider upgrading to an automatic machine. We offer a range of high - quality automatic filling machines, such as the Full Automatic Rotor Pump Filling Machine, Automatic Rotor Pump Paste Filling Machine, and Automatic Rotor Pump Filler with Feeder. These machines are more efficient, accurate, and reliable, and can significantly improve your production process.

Conclusion

Troubleshooting a manual piston paste filling machine when it doesn't fill properly can be a challenging task, but by following the steps outlined above, you can usually identify and fix the problem. Remember to always follow the manufacturer's instructions when performing maintenance or repairs on your filling machine. If you need further assistance or have any questions about our products, please don't hesitate to contact us. We are here to help you find the best filling solution for your business. Whether you are looking to troubleshoot your existing machine or upgrade to a more advanced model, we are your trusted partner in the industry.