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Technical Article
MAN B&W ME-C Hydraulic Pressure Problems: Causes and Troubleshooting
ME-C hydraulic pressure problems are commonly linked to oil contamination, restricted filters, pump condition, internal or external leakage, accumulator issues, pressure sensor faults, or sticking control components. Diagnosis should start with pressure trend, alarm sequence, oil condition, and whether the fault affects all units or one cylinder.
How should hydraulic pressure faults be approached?
First separate system-wide pressure instability from a cylinder-specific actuation problem. A system-wide pressure problem points toward the HPS, filters, pumps, accumulators, sensors, or common leakage. A single-cylinder symptom points more strongly toward the local control valve, actuator, wiring, or cylinder equipment.
Symptom, possible cause and inspection
| Symptom | Possible cause | Inspection |
|---|---|---|
| Pressure drops under load | Pump capacity, leakage, filter restriction, or accumulator issue | Trend pressure against load and inspect common hydraulic components |
| One cylinder alarms repeatedly | Local valve sticking, feedback fault, or actuator leakage | Compare unit data and inspect local component condition |
| Pressure reading unstable | Sensor fault, air in oil, control instability, or real pressure pulsation | Cross-check readings and inspect sensor/wiring condition |
Measurements and acceptance limits
Condition assessment should be based on recorded measurements, visual findings, operating symptoms, and the applicable maker documentation. Acceptable limits should be confirmed against the applicable manufacturer's manual and engine-specific technical documentation.
Need technical assistance?
If inspection, overhaul, troubleshooting, workshop repair, or onboard attendance is required, Dieselmech Group can review the symptoms, engine details, operating history, and available measurements before recommending the next practical step. Contact us at +65 6334 1855, email sales@dieselmech.com.sg, or submit an enquiry through the Contact Us page.
Technical note
This article is for general technical information. Actual procedures, limits, clearances, pressures, temperatures, torque values, and renewal criteria depend on the engine model, configuration, maker revision, service bulletin, vessel procedures, and class requirements. Manufacturer manuals and vessel safety procedures take precedence. Safety-critical work should be carried out by appropriately qualified personnel.
Published by Dieselmech Group Technical Team. For advice on a specific engine or fault, contact our marine engineers.
