NS160HW
Nippon Pusnes Co., Ltd. NS160HW — Mooring winch with hydraulic motor.
Inspector Detail
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Common issues
- Hydraulic motor leakage at the shaft seal
- Brake band or brake disc wear reducing holding torque below rated capacity
- Wire rope and drum wear from repeated mooring loads
- Control valve sticking, causing jerky or delayed response
- Low holding brake pressure/torque due to setting drift or worn linings
- Gearbox oil contamination from water ingress through worn seals
Inspection checklist
- Brake holding test at rated load
- Hydraulic pressure check against the manufacturer's setting
- Wire spooling and drum condition check
- Gearbox oil sampling for water/contamination
- Foundation bolt torque check
- Emergency release/hand-release function test
- Check hydraulic hoses and fittings for chafing or leakage
Service intervals
| Gearbox oil change | typically 2,000-4,000 running hours or annually, whichever comes first - confirm against the maker's manual |
| Brake lining inspection | annually, or per company PMS |
| Grease points | weekly to monthly depending on usage, per PMS |
| Hydraulic filter change | per manufacturer's schedule, commonly annually |
| Brake holding capacity test | at each renewal survey and after any brake maintenance |
Typical wear limits
| Brake lining thickness | replacement is typically triggered around 50% of new lining thickness for this class of winch brake - confirm the exact discard figure against the maker's manual |
| Wire rope discard criteria | per class/manufacturer guidance - broken wire counts over a given length and diameter reduction of roughly 7-10% from nominal are typical discard triggers, confirm against the applicable class rule and rope certificate |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Hydraulic motor shaft seal kit
- Brake lining/pads
- Wire rope (correct diameter and construction for this winch)
- Control valve
- Coupling element
Safety
- Mooring line snap-back zones - crew must stay clear of the bight during heaving/mooring operations
- Hydraulic accumulator stored energy - depressurize and lock out before maintenance
- Crush points at the drum, gearbox and brake mechanism
- Brake failure risk under load if holding capacity has not been recently verified
Class survey
Mooring winches are surveyed with a brake holding capacity test at renewal survey, and wire condition/load test documentation is typically required to be available.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Render test - brake must hold at minimum 60% of Safe Diagonal Minimum Breaking Load (SDMBL). Oil, moisture, rust on lining can reduce capacity up to 75%
Visual inspection for wear, damage, contamination. Maximum allowable wear is 40% (residual thickness must be 60% of original). Measure lining thickness with calipers
Inspect proper cable winding on drum - improper winding reduces braking force by up to 50%. Check for kinks, fraying, or damaged sections along entire cable length
Verify working pressure approximately 250 bar (for Pusnes ring-main systems). Test fluid for contamination, water ingress, viscosity stability. Check all hoses for leaks, cracks, or excessive wear
Inspect enclosed primary gearbox for oil leaks, gear wear, bearing play. Verify oil-bath lubrication system functioning. Check for noise during operation indicating internal damage
Type-general inspection and maintenance points for this equipment category — not model-specific.
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