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Masson Marine Equipment

MM W7400 NR

Masson Marine MM W7400 NR non-reversing reduction marine gearbox, up to 1,727 kW (2,316 hp) input, max 1,850–2,100 rpm depending on rating, ratios 4.608–9.078, dry weight 2,450 kg.

Description

The MM W7400 NR is a non-reversing reduction marine gearbox from Masson Marine's W range, built for continuous duty in workboat and dredger applications.

Key features

  • Reduction marine transmission with 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
  • Suitable for twin installation with 100% rated power ahead and astern
  • Robust design with easy onboard maintenance; fully works-tested and simple to install
  • Design, manufacture and quality control to ISO standards

Technical data

  • Rating: 0.869 kW/rpm (1.165 hp/rpm) at ratio 4.608, decreasing to 0.497 kW/rpm (0.667 hp/rpm) at 9.078
  • Maximum rated input: 1,607 kW (2,155 hp) at 1,850 rpm; up to 1,727 kW (2,316 hp) at 2,000 rpm
  • Ratios: 4.608, 4.815, 5.031, 5.258, 5.494, 6.006, 6.439, 6.868, 7.522, 7.877, 8.655, 9.078
  • Sample capacities (0.869 kW/rpm): 1,042 kW (1,398 hp) at 1,200 rpm, 1,390 kW (1,864 hp) at 1,600 rpm, 1,564 kW (2,097 hp) at 1,800 rpm
  • Dry weight: 2,450 kg (5,400 lb)

Standard equipment

  • Dual stage input coupling
  • Oil cooler with fittings and flexible hoses
  • Control cable bracket and clamp parts for push-pull cable connection
  • Mounting brackets (plate type, for welding)
  • Standard input rubber

Options

  • Engine-matched torsional coupling
  • Propeller shaft flange and coupling bolt set
  • Classification by all major classification societies on request
  • PTO (live or clutchable)
  • Electric trolling valve for slow-speed drive
  • Shaft brake

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
1200 rpm 1600 rpm 1800 rpm
MM W7400 0,869 (1,165) 1607 (2155) 1850 4,608 1042 (1398) 1390 (1864) 1564 (2097) 2450 (5400)
0,848 (1,137) 1653 (2217) 1950 4,815 1017 (1364) 1356 (1819) 1526 (2046)
0,864 (1,158) 1727 (2316) 2000 5,031 1036 (1390) 1382 (1853) 1554 (2084)
0,811 (1,088) 1703 (2284) 2100 5,258 973 (1305) 1298 (1740) 1460 (1958)
0,814 (1,092) 1648 (2210) 5,494 942 (1263) 1256 (1684) 1413 (1894)
0,732 (0,982) 1538 (2062) 6,006 879 (1179) 1172 (1571) 1318 (1768)
0,696 (0,934) 1462 (1961) 6,439 835 (1120) 1114 (1494) 1253 (1680)
0,654 (0,877) 1374 (1843) 6,868 785 (1053) 1047 (1404) 1178 (1579)
0,603 (0,808) 1266 (1698) 7,522 723 (970) 965 (1294) 1085 (1455)
0,576 (0,772) 1209 (1621) 7,877 691 (926) 921 (1235) 1036 (1390)
0,523 (0,702) 1099 (1474) 8,655 628 (842) 837 (1123) 941 (1263)
0,497 (0,667) 1044 (1400) 9,078 597 (800) 795 (1067) 895 (1200)

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