EMW-250kN

Common issues

• Electric drive motor overheating/tripping under sustained high-load mooring operations
• Brake motor (fail-safe spring brake) wear reducing holding torque
• Gearbox oil leakage at input/output shaft seals
• Drum clutch engagement wear causing slip under load
• Control contactor/relay wear in the winch control panel
• Spooling problems from worn drum flanges or spooling gear

Inspection checklist

• Insulation resistance test on the drive motor
• Check brake motor holding torque and spring brake release/engage function
• Inspect gearbox oil level/condition and check for leaks
• Verify the drum clutch engages fully and does not slip under test load
• Check control panel contactors, overloads and emergency stop function
• Inspect drum, warping head and fairleads for wear or sharp edges
• Check foundation bolts and deck seating

Service intervals

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Brake motor spring/brake lining kit
• Gearbox shaft seals
• Drum clutch friction plates
• Motor contactor/overload relay
• Gearbox bearing set

Safety

• The fail-safe brake must hold the rated load with power off - test this specifically, not just under power
• Rotating drum and warping head are a crush/entanglement hazard during mooring operations
• Snap-back zone if a mooring line parts under load
• Electrical hazard at motor/control panel during maintenance - isolate and lock out before opening

Class survey

Mooring winches are surveyed as part of deck machinery under class rules; surveyors verify brake holding test results, SWL marking, and that electrical protection (overload, emergency stop) functions correctly.