Masson Marine Equipment
MM W20500
Reverse reduction marine gearbox (Masson Marine W range) for workboats and dredgers; ratios 2.661–10.767, max rated input up to 3766 kW (5051 hp), dry weight 5800 kg.
Description
The MM W20500 is a reverse reduction marine gearbox from Masson Marine's W range with hydraulically actuated multi-disc clutches, designed for continuous duty in workboat and dredger applications. It is the largest model in this group, offered with a wide spread of ratios from 2.661 to 10.767.
Technical data
- Ratios: 2.661, 3.029, 3.613, 4.085, 4.849, 5.757, 5.959, 6.610, 7.345, 8.184, 8.810, 9.496, 9.989, 10.251, 10.767
- Power rating: 2.527 kW/rpm (3.389 hp/rpm) at 2.661–4.085 down to 1.086 kW/rpm (1.456 hp/rpm) at the highest ratios
- Maximum rated input: up to 3766 kW (5051 hp)
- Maximum input speed: 1490 rpm (2.661–4.085), 1650 rpm (4.849)
- Sample capacities (2.661–4.085): 2527 kW (3389 hp) at 1000 rpm, 3032 kW (4067 hp) at 1200 rpm
- Dry weight: 5800 kg (12790 lb)
Key features
- Robust design with easy onboard maintenance
- Hydraulically actuated multi-disc clutches
- Case-hardened, precision-ground gear teeth for long life and smooth running
- Robust cast iron casing for direct or remote mounting
- Emergency "get home" capability
- Fully works tested; design, manufacture and quality control to ISO standards
- Suitable for twin installation with 100% rated power ahead and astern
Standard equipment
- Oil cooler with fittings and flexible hoses
- Integrated brackets
- Free-standing design
- Lube oil pump
Options
- Engine-matched torsional coupling
- Propeller shaft flange and coupling bolt set
- Classification by all major classification societies
- PTO (live or clutchable)
- Electric trolling valve for slow-speed drive
- Shaft brake
- Electric clutch control
Specifications
| Model | kW/RPM (hp/RPM) | Maximum Rated Input kW (hp) | Maximum RPM | Ratio | Sample Ratio Capacities kW (hp) | Dry Weight kg (lb) | col8 | col9 |
|---|---|---|---|---|---|---|---|---|
| 1000 rpm | 1200 rpm | 1600 rpm | ||||||
| MM W20500 | 2,527 (3,389) | 3766 (5051) | 1490 | 2,661 | 2527 (3389) | 3032 (4067) | (-) | 5800 (12790) |
| 3,029 | ||||||||
| 3,613 | ||||||||
| 4,085 | ||||||||
| 2,127 (2,852) | 3510 (4706) | 1650 | 4,849 | 2127 (2852) | 2552 (3423) | 3403 (4564) | ||
| 1,790 (2,400) | 2954 (3961) | 5,757 | 1790 (2400) | 2148 (2881) | 2864 (3841) | |||
| 1,729 (2,319) | 2853 (3826) | 5,959 | 1729 (2319) | 2075 (2782) | 2766 (3710) | |||
| 1,560 (2,092) | 2574 (3452) | 6,610 | 1560 (2092) | 1872 (2510) | 2496 (3347) | |||
| 1,404 (1,883) | 2317 (3107) | 7,345 | 1404 (1883) | 1685 (2259) | 2246 (3012) | |||
| 1,260 (1,690) | 2079 (2788) | 8,184 | 1260 (1690) | 1512 (2028) | 2016 (2704) | |||
| 1,170 (1,569) | 1931 (2589) | 8,810 | 1170 (1569) | 1404 (1883) | 1872 (2510) | |||
| 1,086 (1,456) | 1792 (2403) | 9,496 | 1086 (1456) | 1303 (1748) | 1738 (2330) | |||
| 1,170 (1,569) | 1931 (2589) | 9,989 | 1170 (1569) | 1404 (1883) | 1872 (2510) | |||
| 1,206 (1,617) | 1990 (2668) | 10,251 | 1206 (1617) | 1447 (1941) | 1930 (2588) | |||
| 1,086 (1,456) | 1792 (2403) | 10,767 | 1086 (1456) | 1303 (1748) | 1738 (2330) | |||
| 1,120 (1,502) | 1848 (2478) | 11,036 | 1120 (1502) | 1344 (1802) | 1792 (2403) | |||
| 1,039 (1,393) | 1714 (2299) | 11,895 | 1039 (1393) | 1247 (1672) | 1662 (2229) |
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