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MM_W3900_

Product catalog summary

Overview
The document describes a robust marine transmission system designed for continuous duty in workboat applications. It is fully tested, reliable, and easy to install, complying with ISO 9001 standards. The system features a reverse reduction marine transmission with hydraulically actuated multi-disc clutches, allowing for easy onboard maintenance and direct access to the clutches. It is compatible with all types of engines and propulsion systems, including both Fixed Pitch Propeller (FPP) and Controllable Pitch Propeller (CPP) applications.

Specifications

Case hardened and precisely ground gear teeth for durability and smooth operation.
Output shaft thrust bearing designed to handle maximum propeller thrust in both directions.
Smooth hydraulic shifting with a control lever for various operating systems.
Suitable for twin engine installations with the same ratio and torque capacity in both directions.
Emergency "get home" capability.
Robust cast iron casing and free-standing design.
Includes an oil cooler with fittings and flexible hoses.
Separated brackets for installation.

Options

Engine-matched torsional coupling.
Propeller shaft flange and coupling bolt sets.
Classification by major Classification Societies upon request.
SAE 0 or SAE 1 bell housing.
Power Take-Off (PTO), either live or clutchable.
Standby oil pump.
Electric clutch control (24 VDC).

Model: MM W3900
The MM W3900 is a vertical offset, direct or remote mount marine transmission with a maximum rated input of 850 KW, suitable for continuous duty applications.

Performance and Dimensions

Continuous Duty Ratios and Sample Power Capacities:
- 6,435 ratio: 490 kW at 1200 rpm, 653 kW at 1600 rpm, 735 kW at 1800 rpm, max 2100 rpm.
- 6,820 ratio: 466 kW at 1200 rpm, 622 kW at 1600 rpm, 699 kW at 1800 rpm, max 2100 rpm.
- 6,955 ratio: 417 kW at 1200 rpm, 556 kW at 1600 rpm, 626 kW at 1800 rpm, max 2100 rpm.
Dimensions: A - 400 mm, B1/B2 - 454 mm, C - 800 mm, H1 - 400 mm, H2 - 705 mm, L1 - 524 mm, L2 - 77.0 mm, L3 - 637 mm.
Weight: 1605 kg, Oil Capacity: 75 Litres.

SAE Bell Housing and Output Coupling Dimensions

SAE No. 0: Bolt Holes - 16, Diameter - 13.49 mm, A - 647.7 mm, B - 679.45 mm, C - 711.2 mm.
SAE No. 1: Bolt Holes - 12, Diameter - 11.91 mm, A - 511.18 mm, B - 530.23 mm, C - 552.45 mm.
Output Coupling: Bolt Holes - 12, Diameter (E) - 24.5 mm, A - 343 mm, B - 292 mm, C - 178 mm, D - 25.4 mm.

Catalog excerpts

MM W3900 Vertical offset, direct or remote mount marine transmission. Maximum rated input: 850 KW Available for Continuous Duty applications. Description • • • • • • • Robust design also withstands continuous duty in workboat applications. Fully works tested, reliable and simple to install. Design, manufacture and quality control standards comply with ISO 9001. Reverse reduction marine transmission with hydraulically actuated multi-disc clutches. Easy onboard maintenance. Direct access to the clutches. Compatible with all types of engines and propulsion systems. (Both FPP and Cpp application). Features • • • • • • • • • Case hardened and precisely ground gear teeth for long life and smooth running. Output shaft thrust bearing designed to take maximum propeller thrust astern and ahead. Smooth and reliable hydraulic shifting with control lever for attachment of push-pull cable or other operating system. Suitable for twin engine installations (same ratio and torque capacity in ahead or astern mode) Emergency “get home” capability. Robust cast iron casing. Free standing. Oil cooler complete with fittings and flexible hoses. Separated brackets. Options • • • • • • • Engine-matched torsional coupling. Propeller shaft flange and coupling bolt sets. Classification by all major Classification Societies on request. SAE 0 or SAE1 bell housing PTO (live or clutchable). Standby oil pump. Electric clutch control (24 VDC).

Open the catalog to page 1

MM W3900 Continuous Duty Ratios kW /rpm 6,435 6,820 6,955 Sample Power Capacities (kW) 1200 rpm 490 466 417 0,408 0,389 0,348 1600 rpm 653 622 556 Max. rpm 1800 rpm 735 699 626 2100 2100 2100 *Ratings homologated with BV certification. Dimensions mm A B1 B2 C H1 H2 L1 L2 L3 Bell Hsg. 400 454 454 800 400 705 524 77.0 637 0 or 1 Weight kg 1605 Oil Capacity Litres 75 SAE Bell Housing Dimensions SAE No. A B C mm mm mm 647.7 511.18 0 1 679.45 530.23 711.2 552.45 Bolt Holes Diameter No. mm 16 12 13.49 11.91 Output Coupling Dimensions A B C D mm mm mm mm 343 292 178 25.4 Bolt Holes Diameter (E) No....

Open the catalog to page 2

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