Fuller RTLO18918B

The Eaton Fuller RTLO-18918B is a heavy-duty, 18-speed manual transmission designed for use in Class 8 on-highway trucks and demanding vocational applications. Known for its strength, durability, and efficiency, the RTLO-18918B is part of Eaton’s Roadranger series—a benchmark in the commercial vehicle industry for performance and reliability.

The RTLO-18918B is a constant mesh, twin-countershaft transmission featuring 18 forward speeds and 4 reverse gears. It is designed to handle high torque and horsepower outputs from modern diesel engines and provides excellent control over vehicle performance, especially in applications involving heavy loads, hilly terrain, or frequent shifting.

This transmission is equipped with a range and splitter design, allowing each gear position to be split into high and low ranges, giving drivers the ability to find the perfect gear for any situation. It also includes an internal oil pump, enhancing lubrication and cooling, especially under continuous high-load operation.

Model Designation Breakdown

• R – Roadranger series
• T – Twin countershaft
• L – Lubrication pump included
• O – Overdrive transmission
• 18 – 18 forward speeds
• 918 – Model-specific torque and gearing code
• B – Revision or version update

Design Features

• Overdrive Top Gear: The .73:1 overdrive ratio reduces engine RPMs at cruising speeds, improving fuel economy.
• Lubrication Pump: Integrated oil pump ensures adequate lubrication of all moving parts, especially in uphill operations or long hauls.
• Twin Countershaft Design: Distributes engine torque across two shafts for added durability and smoother operation.
• Modular Design: Simplifies maintenance and service by allowing easier access to key components.
• Aluminum Case: Offers strength while minimizing weight, improving vehicle efficiency.

Applications

The RTLO-18918B is suited for a wide range of heavy-duty applications, including:

• Over-the-road long haul
• Heavy haul and specialized freight
• Logging and construction
• Tanker and bulk transport
• Vocational trucks operating in severe service conditions

Its broad gear range and high torque rating make it ideal for scenarios where precision, endurance, and fuel efficiency are critical.

The Fuller RTLO-18918B manual transmission is engineered to deliver top-tier performance, long-term durability, and efficient operation in the most demanding trucking environments. Its 18-speed configuration provides exceptional flexibility for varying terrain and load conditions, while the overdrive design and internal lube pump enhance fuel economy and longevity. Whether used in long-haul or vocational fleets, the RTLO-18918B remains a trusted choice for performance-focused operators and fleet managers.

Technical Specifications:

• Speeds: 18 forward, 4 reverse
• Type: Manual, constant mesh
• Input Torque Capacity: 1,850 lb-ft (2,508 Nm)
• Horsepower Capacity: Up to 550 HP
• Dry Weight: Approximately 714 lbs (324 kg)
• Oil Capacity: 28 pints (13.2 liters)
• Recommended Oil: Eaton Roadranger-approved synthetic manual transmission fluid
• Input Shaft: 2.00″ diameter, 10-spline
• Clutch Type: 14-inch pull-type recommended
• PTO Openings: Two (one on each side of the case)
• Case Material: Aluminum alloy for reduced weight

Gear Ratios

• 1st Gear: 14.40:1
• 2nd Gear: 12.54:1
• 3rd Gear: 10.47:1
• 4th Gear: 8.61:1
• 5th Gear: 7.06:1
• 6th Gear: 5.78:1
• 7th Gear: 4.76:1
• 8th Gear: 3.89:1
• 9th Gear (Direct): 3.23:1
• 10th through 16th (High Range Split): Progressively higher ratios down to 1.00:1
• 17th Gear: 0.86:1
• 18th Gear (Overdrive): 0.73:1
• Reverse Gears:
  • Low Reverse: 17.12:1
  • High Reverse: 4.03:1

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