Most gear pump failures are system-related rather than pump-related. Proper oil cleanliness, correct suction design, and routine inspection are key to long-term reliability.
1.Insufficient Pressure or Flow
One of the most common gear pump problems in daily operation:
- Internal wear of gears and housing
- Excessive internal leakage
- Incorrect pump speed or oil viscosity
Result: Reduced system efficiency and slow actuator response.
2.Abnormal Noise and Vibration
Unusual noise often indicates early-stage failure:
- Cavitation due to poor suction conditions
- Air entering the hydraulic system
- Gear meshing wear or shaft misalignment
Risk: Accelerated component damage if ignored.
3.Oil Leakage
Leakage may occur internally or externally:
- Worn shaft seals or damaged O-rings
- Excessive bearing clearance
- High system pressure beyond pump rating
Impact: Oil loss, environmental risk, and pressure instability.
4.Overheating of the Pump
Excessive heat is a warning sign of inefficiency:
- High internal friction
- Continuous internal leakage
- Contaminated or degraded hydraulic oil
Consequence: Reduced oil life and shortened pump service life.
5.Cavitation Damage
Cavitation is a major cause of gear pump failure:
- Blocked inlet filters
- Insufficient oil supply
- Excessive pump speed
Typical Signs: Pitting on gear surfaces and loud noise.
6.Accelerated Wear of Gears and Housing
Common in harsh working conditions:
- Poor oil cleanliness
- Inadequate lubrication
- Long-term overload operation
Outcome: Loss of volumetric efficiency.
7.Seal and Bearing Failure
Often caused by improper operation or installation:
- Excessive axial or radial load
- Misalignment between pump and motor
- Pressure spikes in the system
Result: Sudden pump failure and unplanned downtime.
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