Roadranger (likely Eaton Fuller) RTLO-20918B-AS 2012 Parts Catalog

If you’ve ever tried to order a replacement countershaft assembly for an RTLO-20918B-AS without a parts breakdown, you know the feeling—staring at a pile of gears, guessing which synchro goes where, and hoping the parts counter guy doesn’t ask for a serial number you don’t have. That stops here. This Roadranger (likely Eaton Fuller) RTLO-20918B-AS 2012 Parts Catalog is the factory-issued illustrated parts list, printed November 2012. 48 pages, no reprints, no aftermarket redraws. What you see is what the assembly line used.

Every exploded view in this manual matches the actual production configuration. Not some generic “fits all” drawing. The TOC starts with How To Use The Illustrated Parts List on page 3, then dives straight into AFTERMARKET TRANSMISSIONS (page 4) for identifying replacement units, then hits the hard stuff: CONTROLLER ECU & HARNESS (page 13), MAINSHAFT & SYNCHRO(AUX) (page 26), and SHIFT BAR HOUSING. Each section gives you an exploded diagram, the corresponding part number, and a quantity. No fluff, no “refer to dealer” notes that waste your time.

7 Systems Covered in This Parts Catalog

The manual breaks down the RTLO-20918B-AS into 24 sections (yes, I counted). You get the AUXILIARY DRIVE GEAR, CASE (AUX), CASE (FRONT), COUNTERSHAFT & BRGS(AUX), COUNTERSHAFT ASSY, DRIVER COMMAND CONSOLE, FILTER REGULATOR, GEAR DISPLAY MODULE, HEAT EXCHANGER, INPUT SHAFT & DRIVE GEAR, INTEGRAL OIL PUMP, KITS & ASSEMBLIES, MAINSHAFT & SYNCHRO(AUX), MAINSHAFT ASSY, OIL COOLER, OIL FILTER, RANGE CYLINDER, REVERSE IDLER, and more. Each section lists every seal, bearing, snap ring, and bolt. If you need to rebuild the CONTROLLER ECU & HARNESS, page 13 shows the exact harness routing and connector part numbers. No third-party interpretation.

Does This Manual Cover the Fuel System?

No. This is a transmission illustrated parts list—no engine, no chassis, no fuel injection diagrams. It covers every internal and external component of the RTLO-20918B-AS transmission. If you’re looking for engine parts, check the Automotive Industry Overview”>Automotive Industry Overview for related manuals, but for the transmission itself, this is the final word.

3 Reasons to Choose OEM Documentation

First, the exploded views are drawn from the actual production tooling. Aftermarket catalogs often combine parts from multiple years to save ink, which means you end up with a part that doesn’t fit. Not here. Second, the part numbers are OEM—they match Eaton Fuller inventory systems. You can walk into any dealer and hand them the number from this catalog. Third, the KITS & ASSEMBLIES section (page 24) lists overhaul kits by serial number range. That saves you from ordering individual bearings and gaskets that may have been superseded.

Torque Specs and Fluid Capacities?

This is a parts catalog, not a service manual. It does not list torque specs. If you need assembly torque values, you need the corresponding service manual for the RTLO-20918B-AS. However, with this catalog you can order the correct fasteners (including bolts and studs) by part number. For fluid capacities, refer to the operator’s manual or the Eaton Fuller lubrication guide. But for which oil filter or which seal to buy, this catalog is your source.

How to Identify Your Transmission Using This Catalog

Before you order parts, verify your transmission model tag. The manual covers the RTLO-20918B-AS only. Not the RTLO-16918B or the RTLO-22918B. On page 1 you’ll see “RTLO-20918B-AS November 2012.” The DRIVER COMMAND CONSOLE section includes the shift selector and wiring – if your truck has an automated manual transmission with a console, this manual shows the exact bracket and connector. Cross-reference the CONTROLLER ECU & HARNESS section with your ECU serial number to confirm compatibility.

Where to Find Part Numbers Fast

Each exploded view has a callout number next to each component. The corresponding parts list directly below gives the part number, description, and quantity per assembly. For example, the MAINSHAFT & SYNCHRO(AUX) on page 26 shows the synchro assembly with its retaining ring and thrust washer—all with individual part numbers. If your mainshaft is worn, flip to MAINSHAFT ASSY (page 28) for the complete assembly PN. No need to guess which spline count you have.

Source Authenticity: Why This Manual Beats Aftermarket

This is a factory PDF from Roadranger (likely Eaton Fuller), published November 2012. It’s an exact scan of the printed catalog, not a re-typed list. The OCR is clean, the diagrams are high-resolution. Aftermarket parts catalogs often use “universal” diagrams that combine multiple models, leading to wrong parts. I’ve seen shops order a reverse idler gear from a generic catalog and end up with a gear that has a different tooth count. This catalog gives you the exact Eaton Fuller part number. For related OEM parts, check the Massey-Harris-Ferguson FF 30 GS 1957 Parts Catalog | OEM Fastener Guide”>Massey-Harris-Ferguson FF 30 GS 1957 Parts Catalog | OEM Fastener Guide for vintage tractor fasteners or the Futura Wear Technology Parts Catalog”>Futura Wear Technology Parts Catalog for wear parts. For agricultural transmissions, the LANDTRAC TRACTOR Parts Manual Models 410-550 DTC – Section: Numerical Index”>LANDTRAC TRACTOR Parts Manual uses the same indexing structure.

Can I use this catalog to rebuild a RTLO-20918B-AS without a service manual?

No. This is a parts list, not a rebuild guide. You still need the official service manual for disassembly and assembly procedures. But with this catalog, you can order every part you need before you start—saves you from stopping mid-job.

Does the manual include the oil pump integral assembly?

Yes. The INTEGRAL OIL PUMP section (page 22) shows the pump body, cover, drive gear, and all seals with OEM part numbers. If your pump is leaking, you can order the seal kit or the complete pump assembly by referencing that page.

When you’re ready to order parts for that RTLO-20918B-AS, you need the right numbers. Download the Factory Manual from AutoRepairManuals and get the original 48-page parts breakdown. No aftermarket, no guesswork, just the parts list the factory used. Download the Factory Manual.