Oil Leakage in Hydraulic Equipment – What’s the First Thing You Check?

Hydraulic oil leakage is one of the most common problems encountered in construction machinery, mining equipment, and industrial hydraulic systems. Even a small leak can quickly lead to performance loss, contamination, and costly downtime.

When leakage appears, technicians usually begin with a systematic inspection.

1. Inspect the shaft seal area

• Check if oil is leaking directly from the seal lip

• Look for wear or cracks on the seal surface

• Inspect surrounding components for contamination

2. Examine shaft surface condition

• Scratches or grooves can damage the seal lip

• Rough surfaces increase friction and wear

3. Check hydraulic pressure levels

• Excessive pressure may force oil past the sealing lip

• Pressure spikes can shorten seal lifespan

4. Verify installation condition

• Misaligned seals often cause uneven wear

• Incorrect installation tools may deform the seal

By inspecting these areas first, maintenance teams can quickly determine whether the leak is caused by seal wear, installation problems, or system pressure issues.

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