Fuller RTLO18913AH

The Eaton Fuller RTLO-18913 series is a family of 13-speed manual transmissions engineered for high-performance, heavy-duty applications in the commercial trucking industry. As part of Eaton’s Roadranger RTLO series, these transmissions are built for on-highway use in Class 8 trucks, and are well-known for their durability, fuel efficiency, and versatility, especially in long-haul, tanker, and heavy-freight applications.

The RTLO-18913 series provides drivers with a broad gear ratio spread, allowing fine-tuned control over power delivery across a wide range of terrains, loads, and speeds. The combination of high torque capacity, an overdrive design, and an integrated oil pump make this transmission an ideal choice for demanding, high-mileage operations.

Model Breakdown: RTLO-18913

• R – Roadranger series
• T – Twin countershaft design
• L – Equipped with an integrated oil pump (for enhanced lubrication)
• O – Overdrive top gear
• 189 – 1,850 lb-ft torque rating
• 13 – 13 forward speeds

Shifting System and Operation

The RTLO-18913 is operated using a standard H-pattern shifter combined with both a range selector and a splitter button. This allows drivers to:

• Shift through 5 main gears in low range (1–5)
• Use the range selector to switch to high range (6–10)
• Use the splitter to access intermediate gears in high range (11–13)

The 13-speed layout provides the benefits of both low-end torque control and higher-speed fuel efficiency—making it extremely versatile.

This is a non-synchronized transmission, meaning it requires double clutching or floating gears during shifts.

Key Features

• Overdrive Top Gear (0.73:1): Optimized for highway efficiency, reducing engine RPM and improving fuel economy.
• Integrated Oil Pump: Enhances internal lubrication, which is especially valuable in extreme-duty or high-mileage scenarios.
• Twin Countershaft Design: Balances torque loads and increases gear strength and reliability.
• High Torque Rating: Handles up to 1,850 lb-ft of torque, suitable for powerful engines and demanding loads.
• PTO Compatibility: Dual side power take-off ports allow easy integration of hydraulic pumps, compressors, and other auxiliary equipment.
• Modular Design: Simplifies service, inspection, and component replacement.

Applications

The RTLO-18913 is ideally suited for:

• Long-haul trucking and linehaul
• Tanker and bulk freight transport
• Heavy-duty freight and flatbed operations
• Logging and vocational trucks
• Any application requiring both low-speed power and highway-speed efficiency

Technical Specifications:

• Model: RTLO-18913 / RTLO-18913A / RTLO-18913B (varies slightly by version)
• Type: Manual, constant mesh, twin-countershaft
• Speeds: 13 forward, 2 reverse
• Input Torque Capacity: 1,850 lb-ft (2,508 Nm)
• Horsepower Capacity: Up to 550 HP (depending on duty cycle)
• Weight (dry): Approx. 714 lbs (324 kg)
• Oil Capacity: 28 pints (13.2 liters)
• Lubrication System: Pressurized oil lubrication with internal pump
• Input Shaft Diameter: 2.00 inches
• Input Shaft Spline Count: 10-spline
• Clutch Type: Compatible with 14-inch pull-type clutches
• PTO Ports: Two (one on each side)
• Housing Material: Lightweight, high-strength aluminum alloy

Gear Ratios (Approximate)

Low Range Gears:

• 1st: 14.40:1
• 2nd: 12.54:1
• 3rd: 10.47:1
• 4th: 8.61:1
• 5th: 7.06:1
• 6th: 5.78:1
• 7th: 4.76:1
• 8th: 3.89:1
• 9th: 3.23:1

High Range / Splitter Gears:

• 10th: 2.73:1
• 11th: 2.32:1
• 12th: 1.97:1
• 13th (Overdrive): 0.73:1

Reverse Gears:

• Low Reverse: 17.12:1
• High Reverse: 4.03:1

This configuration provides a wide gear ratio span—ideal for starting heavy loads from a stop and maintaining fuel-efficient RPMs at highway cruising speeds.

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800-621-3914

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