Description
ZF BW 361 6.4 Gearbox
The ZF BW 361 with a roughly 6.4 (specifically 6.458:1) gear ratio is a heavy-duty marine reverse-reduction transmission. It handles up to 1,143 kW of power at an input speed of 1800 RPM, using a hydraulically actuated multi-disc clutch system designed for commercial or large pleasure craft.
Technical Specifications
- Model: ZF BW 361
- Ratio: 6.458:1
- Max Input Power (Medium Duty / MD): 1143 kW (approx. 1533 hp) at 1800 RPM
- Max Input Power (Continuous Duty / CD): 990 kW
- Clutch Type: Hydraulically actuated multi-disc clutch
- Approximate Weight: ~1300–1600 kg (depending on configuration/housings
Key Features
- Robust cast housing designed for continuous heavy marine operations
- Integrated hydraulic pump, control valves, and oil filter
- SAE housing compatibility
- Options for electric shifting or trolling valves on specific builds
Maintenance Guidelines
- Oil Level Monitoring: Always check the transmission fluid level exactly two minutes after shutting down a warm engine. The correct fluid line must fall squarely between the upper and lower hash marks on the dipstick.
- Fluid Break-In: After completely replacing the oil, flushing the system, or swapping the oil filter, you must run the transmission for two minutes at idle. Afterward, shut it down and re-check the fluid level to account for the volume trapped inside the internal cooler lines and filter housing.
- Lubricant Type: These systems typically use heavy-duty single-grade marine transmission fluid or specialized matching the specific factory data sheet
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