Common causes and solutions for oil purifier oil leakage

Common Causes and Solutions for Oil Leakage from Oil Filters

Oil leakage from oil filters is usually caused by seal failure, component damage, or improper operation. Specific causes can be categorized as follows:

Sealing Problems (Most Common)

Possible Causes

- Deterioration of seals/gaskets: Long-term use causes hardening and deformation of the rubber.

- Improper installation of seals: Misalignment, uneven tightening force, or damage during installation.

- Worn sealing surfaces: Scratches or corrosion on the sealing surfaces of flanges, joints, or filter canisters.

Solutions

✔ ｒｅｐｌａｃｅ the seals (choose oil-resistant and high-temperature resistant materials, such as fluororubber).

✔ Check the sealing surfaces for flatness and grind or ｒｅｐｌａｃｅ if necessary.

✔ Install according to specifications to avoid deformation caused by overtightening.

Loose or Damaged Connections

Possible Causes

- Loose bolts/nuts: Vibration or thermal expansion and contraction can cause fastener failure.

- Leakage from pipe joints: Worn threads, weld cracks, or poor sealing of quick-connect fittings.

- Cracked welds in the filter canister/tank: Caused by long-term pressure shock or material fatigue.

Solution

✔ Regularly check and tighten bolts (use lock washers or thread sealant is recommended).

✔ ｒｅｐｌａｃｅ damaged joints or re-weld leaking points.

✔ Use spiral wound gaskets or hydraulic sealant in high-pressure areas.

Filter Element or Filter Housing Problems

Possible Causes

- Improper installation of the filter element: A gap exists between the filter element and the housing.

- Cracked filter housing: Overpressure operation or material defects (such as pinholes in the casting).

- Missing/damaged O-ring: The filter element seal is not installed or is aged.

Solution

✔ When replacing the filter element, confirm the model matches and ensure the seal is in place.

✔ Check the filter housing's pressure capacity to avoid operating beyond the rated pressure.

✔ Release the pressure after shutting down the machine before opening the cover to prevent hydraulic shock from damaging the seal.

Oil or System Problems

Possible Causes

- Excessive oil temperature: Accelerates seal aging or reduces oil viscosity.

- Oil contamination: Particles wear seal surfaces or block oil return lines.

- System pressure fluctuations: Hydraulic shock causes transient leaks.

Solutions

✔ Control oil temperature (install a cooler to maintain the oil temperature ≤ 60°C).

✔ Filter the oil regularly to prevent impurity accumulation.

✔ Check the system pressure relief valve for proper function to avoid pressure spikes.

Improper Operation or Maintenance

Possible Causes

- Frequent starts and stops: Sudden pressure fluctuations shock seals.

- Improper maintenance: Use of incompatible sealants or cleaning agents.

- Neglecting routine inspections: Minor leaks go undetected.

Solutions

✔ Standardize operating procedures and avoid frequent starts and stops.

✔ Use manufacturer-recommended sealing materials (such as Loctite 587 Silicone).

✔ Conduct regular inspections, focusing on flanges, filter elements, and pipe connections.

Leak Troubleshooting Process (Quick Location)

1. Visual Inspection: Look for the origin of the oil stain (commonly found on seals, welds, and joints).

2. Pressure Test: Shut down the equipment and apply pressure. Use a paper towel or fluorescent leak detector to locate the leak.

3. Sectional Troubleshooting: Isolate the pipeline or filter tank section by section to confirm the leak location.

Preventative Recommendations:

- Regularly ｒｅｐｌａｃｅ wearing parts (seal rings are recommended every 1-2 years).

- ｓｅｌｅｃｔ high-temperature and corrosion-resistant sealing materials.

- Record leakage history and address weaknesses.

If oil leakage persists, contact the manufacturer to inspect the equipment structure or system design for defects.