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New Old Stock Twin Disc MGX-6690SC With 1.88:1 Ratio Marine Gearbox. Ready to Install !!
Twin Disc MGX-6690SC 1.88:1 Ratio Marine Transmission
$27,200.00
New Old Stock Twin Disc MGX-6690SC With 1.88:1 Ratio Marine Gearbox. Ready to Install !!
New Twin Disc MGX-6690SC 1.88:1 Ratio Marine Transmission. Old Stock, Never Installed!
The Twin Disc MGX-6690SC is a high-performance, vertical offset marine transmission featuring Twin Disc’s renowned QuickShift® technology. The 1.88:1 reduction ratio model is specifically built to deliver lightning-fast, smooth clutch engagement, precise slow-speed control, and optimized power handling for heavy-duty marine applications.
SPECIFICATION
Reduction Ratio: 1.88:1
Housing Type: Vertical offset, aluminum housing
Maximum Input Rating (1.88:1 Ratio):
- Intermediate Duty (@ 2100 RPM): Up to 1380 kW (1851 HP)
- Medium Duty (@ 1800 RPM): Up to 1174 kW (1574 HP)
- Continuous Duty (@ 1600/1800 RPM): Up to 1129 kW (1514 HP)
Maximum Allowable Engine Speed: 2300 RPM
Dry Weight: Approx. 1001 kg (2207 lbs)
STANDARD EQUIPMENT
Control Valve: Electric GP-valve with manual override
Profile Module: EC050 / EC600PC electronic interface for engagement signals
Cooling System: Mounted oil cooler for raw water cooling (fresh water cooling optional)
Filtration: Integrated oil strainer and oil filter
Output Clearance: 0.05 to 0.15 mm (0.002 to 0.006 in.) bearing clearance for ratios ≥ 1.88:1
OPTIONAL CONFIGURATIONS
Flywheel & Coupling: Flexible couplings for 18" (SAE size 460) or 21" (SAE size 530) flywheels
Power Take-Off (PTO): Live or hydraulic clutchable PTO options (SAE "B", "C", and "C-C" configurations up to 1187 Nm)
Controls: E-Troll module, mechanical/electronic control valves, and EC300 trailing pump options
KEY FEATURES
QuickShift® Technology: Incorporates a fully integrated system of internal clutches, actuators, and electronic control modules. It cushions clutch engagement to deliver instantaneous response and eliminate shift shock.
Express Positioning® (Optional): When paired with appropriate electronic propulsion control systems, it enables seamless slow-speed boat handling and dynamic positioning via integrated trolling features.
Robust Construction: Built using a vertical offset layout inside a lightweight, high-strength aluminum housing to maximize power-to-weight efficiency.
Identical Forward and Reverse Ratios: Operates at full rated horsepower through either the primary or secondary shaft using a standard right-hand rotation engine, giving the transmission full capability in both directions.
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