Rapp Hydema Mooring Winch
Rapp Marine Group (Bodø, Norway) is a Norwegian deck machinery manufacturer whose Rapp Hydema brand (formerly Hydema, Åndalsnes) produces hydraulic mooring winches for tugs, ferries, offshore supply vessels and fishing vessels. Particularly strong in the Norwegian coastal shipping and fishing market.
Inspector Detail
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Common issues
- Hydraulic system leakage at the motor, valves, or hose connections
- Brake band/disc wear reducing holding capacity
- Wire rope or drum wear, including poor spooling from an incorrect fleet angle
- Clutch mechanism wear affecting drum-to-gearbox engagement
- Gearbox oil contamination or wear from seawater ingress
- Corrosion of the drum, gypsy, and structural mounting from the marine environment
Inspection checklist
- Check hydraulic oil level, condition (water contamination), and filter status
- Inspect brake band/disc lining thickness and test holding capacity
- Check wire rope condition (broken wires, corrosion, lubrication) against the applicable rope standard
- Verify clutch engagement/disengagement operation
- Sample gearbox oil for water and metal content
- Check drum and shaft bearing condition and lubrication
- Test the auto-tension/render-recover function, if fitted
- Inspect foundation bolts and structural mounting for cracking or corrosion
- Function-test the emergency/manual brake release
Service intervals
| Hydraulic oil change | typically every 2,000-4,000 running hours or annually, per the maker's schedule |
| Gearbox oil change | annually, or per running hours per the maker's manual |
| Brake lining inspection | every 6-12 months, condition-based |
| Wire rope inspection | every 3-6 months per the rope maker's/class guidance |
| Brake holding capacity/render test | per class/flag requirement for mooring winches |
Typical wear limits
| Brake lining thickness | renew at the maker's minimum-thickness mark, commonly around 50% of new thickness - confirm against Rapp Hydema's own limit |
| Wire rope discard criteria | per the applicable wire rope standard (broken-wire count, diameter reduction) - confirm against the rope's own class and the class society's guidance |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Brake band/disc lining sets
- Hydraulic motor seal kits
- Clutch friction plates/dog clutch components
- Hydraulic hoses and fittings
- Gearbox seals/gaskets
- Wire rope sized to the drum
Safety
- Snap-back/whip hazard if a loaded wire rope fails - keep clear of the bight and snap-back zone
- Stored hydraulic pressure must be isolated and relieved before maintenance
- Brake holding capacity must be verified - inadequate render control can cause uncontrolled payout under load
- Crush and entanglement hazard at the drum and fairlead during operation
Class survey
Mooring winches fall under the deck machinery survey scope; class typically expects a brake holding/render test at the defined interval, wire rope certification/inspection records, and confirmation that the emergency release arrangement functions correctly.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Service & Maintenance
Hydraulic system maintenance critical. Oil analysis annually.
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