Reintjes WGF 50000kW 6:1
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.
Inspector Detail
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Common issues
- Lube oil cooler fouling reducing cooling capacity and raising bearing temperatures
- Thrust bearing temperature rise or pad wear under sustained high load
- Gear tooth flank pitting or micropitting on highly loaded flanks
- Water ingress into the oil system from a leaking cooler, causing bearing corrosion
- Flexible coupling element wear on input or output couplings
- Misalignment after engine/gearbox work or dry-docking, showing up as vibration
- Clutch or PTO/PTI wear or slippage where fitted
Inspection checklist
- Oil sample analysis (particle count, water content, viscosity, wear metals)
- Bearing temperature trend against baseline, particularly the thrust bearing
- Gear backlash check against new-build/commissioning record
- Borescope inspection of tooth flanks via inspection covers
- Thrust bearing axial clearance check
- Coupling alignment check
- Oil cooler differential pressure/fouling check
- Vibration monitoring trend on gearbox bearings
- Oil filter differential pressure
Service intervals
| Oil sample analysis | typically every 500-1,000 running hours or per the vessel's condition-monitoring programme |
| 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 |
Typical wear limits
| 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.
Critical spares
- Oil filter elements
- Thrust bearing pads/shells (do not order by memory - confirm exact type from the nameplate/manual)
- Radial/journal bearing shells
- Input and output shaft seals
- Flexible coupling elements
- Bearing temperature sensors (RTDs)
- Oil cooler gasket set
Safety
- Large stored rotational energy at full power - shaft/coupling guards must be in place before running
- Residual shaft rotation from a wind-milling propeller in a seaway - lock out and chock before opening covers, even with the engine stopped
- Hot oil and hot bearing surfaces near the thrust bearing housing
- Stored hydraulic pressure in clutch/PTO actuation systems where fitted
Class survey
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.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Visual inspection with endoscope/borescope after removal of inspection floor covers (port side, standard 2 pieces). Check for discoloration, scratches and spalling of tooth flanks. Superficial pitting can indicate accelerated failure.
Rolling bearings inspect visually with endoscope camera (in particular PTO shaft and countershaft). Watch for discoloration on outer ring (thermal damage), scratches or surface roughness defects on rolling elements. Scan bearing housings with stethoscope or ultrasonic detector: abnormal noise (grinding, clicking, squealing) indicates wear.
Every 6 months take oil sample and analyze laboratory-geometrically. Visual inspection: oil color (dark = abnormal), particles or combustion traces, water ingress (turbidity). Perform oil change with filter element replacement. First time after 200 operating hours, then every 2000 hours or 6 months.
Check operating pressure (21–25 bar standard). Inspect disc chatter for wear, contamination and functionality. Check coupling piston, return springs, O-rings and pressure valve. In case of overhaul replace disc chatter, retainer ring sets and springs.
Check shafts with runout gauge for deflection (target value is model-specific). Check bearing seats for wear or damage. Inspect shaft shoulders and fit surfaces. In case of overhaul check shafts for scratches/cracks with surface roughness gauge (Reintjes manufacture: pinion and reduction shafts are crack-tested/stress-relieved).
External inspections: check aluminum or steel housing for oil leakage, corrosion and mechanical damage. Check inspection floor covers and O-rings for wear. Check oil level at sight glass (should be between min/max). Check shaft seal ring locations and wear rings for roughness and scratches.
Type-general inspection and maintenance points for this equipment category — not model-specific.
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