CAPSTAN HEAD ASSEMBLY
The capstan head assembly is a vertical-axis deck machinery system used for handling mooring lines, towing ropes, and general cargo operations. It provides controlled pulling force during berthing, unberthing, and line handling activities.
Key functions:
• Heaving in and paying out mooring lines
• Assisting with towing and warping operations
• Supporting cargo handling and deck tasks
• Maintaining controlled tension on ropes and wires
• Improving safety and efficiency during mooring
Main components:
• Capstan Head
• Vertical Shaft
• Wildcat or Rope Wheel
• Gypsy Wheel
• Bearings
• Gearbox
• Coupling
• Electric or Hydraulic Motor
• Deck Plate and Base Frame
How it works:
The electric or hydraulic motor drives the gearbox, which rotates the vertical shaft and capstan head. The mooring line is wrapped around the capstan head, and friction between the rope and drum generates the pulling force needed for line handling operations.
Operating modes:
• Heaving In – Pulls the mooring line onboard
• Holding – Maintains line tension securely
• Paying Out – Releases the line under controlled conditions
Safety reminders:
• Keep clear of snap-back zones during operation
• Wear appropriate PPE at all times
• Maintain clear communication between deck crew and bridge
• Inspect brakes, bearings, and drive components regularly
Routine inspection and preventive maintenance of the capstan head assembly are essential for safe and reliable mooring operations.
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