How to Fill Hydraulic Oil for a Powder Pellet Press Machine

Proper hydraulic oil filling is essential to ensure the stable operation, pressing accuracy, and long service life of a powder pellet press machine. Whether you are using a 20-ton, 30-ton, or 100-ton fully automatic powder pellet press or other models, correct oil filling and maintenance are key to reliable performance and smooth operation.

This guide explains how to choose the right oil, determine the proper filling amount, and follow the correct procedure for hydraulic oil maintenance.

Recommended Hydraulic Oil Type

For powder pellet press machines, it is recommended to use No. 68 anti-wear hydraulic oil.
This oil provides excellent lubrication, oxidation stability, and wear resistance, which help maintain consistent hydraulic pressure and prevent system wear.

Recommended Oil: No. 68 Anti-Wear Hydraulic Oil
Viscosity Grade: ISO VG 68
Operating Temperature Range: -10°C to 60°C
Performance: Excellent anti-oxidation and anti-wear protection

Oil Filling Quantity

For a 20-ton fully automatic powder pellet press, the standard hydraulic oil filling amount is approximately 1 liter.
When adding oil, fill it until the level reaches about 2 cm below the oil filling port.

Overfilling may cause pressure instability or oil leakage, while insufficient oil can lead to hydraulic system failure or abnormal noise. Always check the oil level before each operation to ensure the machine runs smoothly.

Tools Required for Oil Filling

To ensure clean and accurate oil filling, use a manual hydraulic oil syringe (also called a hand-push injector).
This tool allows precise injection of hydraulic oil without introducing air bubbles or contaminants.

Recommended Tool: Manual Hydraulic Oil Syringe
Function: Controlled and clean oil injection
Tip: Clean the syringe before and after each use to maintain oil purity.

Oil Filling Procedure

Follow these steps to correctly fill the hydraulic oil:

Turn off the power and make sure the powder pellet press is placed on a stable surface.
Remove the three screws on each side of the back cover and open the rear panel of the machine.
Unscrew the oil filling port cap to access the filling point.
Use the manual syringe to slowly inject No. 68 anti-wear hydraulic oil into the filling port.
Stop filling when the oil level is approximately 2 cm below the port.
Tighten the oil port cap and close the back cover.
Wipe away any excess oil and check for leaks before turning the power back on.

Maintenance Tips

Check the oil level once per month and refill if necessary.
Replace the hydraulic oil every 6–12 months for normal operation; every 3–6 months if the machine is used frequently or under high load.
Keep the equipment in a clean, dry, and stable environment to prevent dust or moisture from entering the hydraulic system.
Always use the specified oil and proper tools to ensure system safety and performance.

Conclusion

Regular hydraulic oil maintenance is essential for achieving consistent performance, smooth operation, and long-term durability of your powder pellet press. Following proper maintenance routines helps minimize downtime, prevent mechanical failures, and ensure consistent pellet quality.