Description
ZF BW 251 4.792.1 Gearbox
The ZF BW 251 4.792:1 is a heavy-duty marine reverse-reduction transmission from the ZF 2500 series. It features a gear ratio of 4.792 to 1 and a rating capacity typically around 0.346 kW per RPM (operable up to around 1800 RPM), engineered for commercial or large recreational marine propulsion setups.
Technical Specs & Features
- Ratio: 4.792:1
- Input Rating: ~0.346 kW/RPM
- Max Rated Speed: 1800 RPM
- Housing/Config: SAE housing compatibility (such as SAE 0), mechanical or flexible coupling controls
Operational Design
- Clutch Type: Hydraulically actuated multi-disc clutches
- Housing Material: Heavy-duty cast iron casing built for long-term workboat or heavy commercial marine applications
- Thrust Bearing: Heavy-duty integrated output shaft thrust bearing designed to handle full propeller thrust ahead and astern
Structural & Installation Features ZF BW 251
- Housing Size: Standard SAE 0 flywheel housing
- Flexible Coupling: 18-inch size compatibility
- Shift Controls: Mechanical control setup
- Power Take-Off (PTO): No standard built-in PTO on this configuration
- Integrated Hardware: Includes structural mounting brackets and a dedicated marine transmission oil cooler
Technical Specifications
- Brand/Manufacturer: ZF Marine
- Model Series: BW 251 / BW 251A
- Gear Ratio: 4.792:1
- Power Capacity: 0.346 kW / RPM
- Continuous Rated Output: Up to 622 kW (approx. 834 hp) at 1800 RPM (Certain duty ratings can peak up to 846 kW depending on commercial classification)
- Maximum Rated Input Speed: 1800 RPM
