Propulsion Gearbox / Reduction Gear · Propulsion Gearbox
The Reintjes WGF 50000 kW 6:1 is an offset marine propulsion reduction gearbox that delivers up to 50 MW, converting a typical engine speed of 1500 rpm to a propeller speed of about 250 rpm with a fixed 6:1 ratio.
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| Oil sample analysis | typically every 500-1,000 running hours or per the vessel's condition-monitoring programme |
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| Oil filter element | condition-based on differential pressure, commonly every 2,000-4,000 running hours |
| Full oil change | typically every 2-4 years or per oil analysis results - confirm against Reintjes' maintenance manual |
| Coupling alignment check | at each dry-docking or after any engine/gearbox disturbance |
| Internal bearing/gear inspection | typically aligned with intermediate or special survey intervals (roughly 2.5-5 years) - confirm against the maker's manual and class requirement |
| Gear backlash increase | flag for closer inspection once measured backlash has grown well beyond the new-build value (commonly cited in the order of 50-100% increase for gears this size) - confirm against Reintjes' own acceptance limit, not a generic figure |
|---|---|
| Thrust bearing axial clearance | typically in the range of 0.10-0.30 mm when new for reduction gears in this power class - growth beyond that range should be compared against the gearbox's own commissioning record and maker's manual |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Large propulsion gears of this power class are normally under Continuous Machinery Survey if the vessel is enrolled: class wants oil analysis records, bearing temperature trend logs, tooth/bearing inspection reports, and alignment records after any coupling or engine disturbance.
Estimated lifetime: Designed for the full ship service life (commonly 20-25+ years) with bearing and gear condition managed by oil analysis, vibration trending and scheduled internal inspections rather than a fixed running-hour end-of-life.
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