Description

Eaton FS-4005A 2011 Parts Catalog – Factory Parts Breakdown for Truck Transmissions

If you are digging through stacks of aftermarket catalogs trying to match a countershaft or an input shaft for an Eaton FS-4005A 2011 Parts Catalog, you already know the pain. Aftermarket drawings often pull dimensions from memory and leave you holding the wrong part. I’ve seen guys order a mainshaft based on a length measurement, only to find the spline count is off by two. That costs you time and money. This 18-page OEM parts catalog from Eaton gives you the exact part numbers, exploded views, and kit groupings straight from the factory. No guesswork.

How to Use This Illustrated Parts List

Page 3 of the catalog explains the system. Every part number that starts with an ‘A’ is a pre-assembled production assembly. Kits and assemblies (K/A’s) are grouped together so you order one number instead of ten loose pieces. If you are replacing a shift bar housing, you look up that section and grab the kit number. The manual tells you to check the online EPC at roadranger.com for updates, because Eaton revises parts lists. But for a 2011 FS-4005A, this printed catalog is your baseline. The index on page 2 lays out ten sections: Case, Countershaft Assy, Input Shaft, Kits & Assemblies, Lever Assy, Mainshaft Assy, Miscellaneous, Remote Control, Reverse Idler Gear Assy, and Shift Bar Housing. That covers the whole transmission.

Case, Countershaft, and Input Shaft – What You Get

The Case section starts on page 4. You get an exploded view with callouts. Countershaft assembly is on page 6 – every gear, bearing, and snap ring has a part number. Input shaft details on page 7. If you need the exact part number for an input shaft bearing, you look at that page and the callout matches the list. No cross-referencing third-party books. This is the same document a dealer parts counter uses. You can also check related factory catalogs for other Eaton models: Eaton RTLO-16618A 2010 Parts Catalog – Factory Breakdown for Truck Shops and Eaton RT-8908LL 2006 Parts Catalog – Factory PDF Manual. Both follow the same format.

Why a Factory Parts Catalog Beats Aftermarket

I have seen aftermarket parts catalogs that list a part as “fits Eaton FS-4005A” with no illustration. Then you install it and the bolt pattern is wrong. The OEM catalog gives a dimensioned drawing and the exact part number. If the part number does not match, do not use it. This 18-page catalog comes directly from Eaton’s 2011 publication. It is not a reprint of something a third party scanned. The exploded views on pages 4 through 15 are crisp, with callout numbers that tie to the list. For the shift bar housing on page 15, you can see exactly how the detent balls and springs go. That matters when you are rebuilding a remote control linkage and need the correct plunger. Eaton RTXF 2011 Parts Catalog – Factory Parts Breakdown is another model-specific reference you might need.

18 Pages: What’s Inside the FS-4005A Catalog

Eighteen pages does not sound like a lot, but each page is dense. Cover and contents (pages 1-2), then the parts list usage instructions (page 3), then eight sections with exploded diagrams and part number tables. The pages run consecutively: Case (4-5), Countershaft Assy (6), Input Shaft (7), Kits & Assemblies (8), Lever Assy (9-10), Mainshaft Assy (11), Miscellaneous (12), Remote Control (13), Reverse Idler Gear Assy (14), Shift Bar Housing (15). The remaining three pages? blank end sheets. Every section shows the assembly from multiple angles if needed. For a shop that works on Roadranger transmissions, this catalog saves you from pulling a transmission apart just to read a part number off a worn gear. You look up the gear on page 6 and order the correct one.

Kits & Assemblies – The A-Numbered Parts

Page 8 lists kits and assemblies. When you buy a kit, you get the entire group of parts that Eaton expects you to replace together. For example, a bearing kit might include the bearing, a new snap ring, and the seal. That prevents you from forgetting a critical item. The catalog identifies each kit with a part number starting with ‘K-’. Production assemblies start with ‘A-’. If you are ordering a complete lever assembly from page 9, you want the assembly number, not the individual pieces. This section alone can cut your parts-ordering time in half. Automotive Industry Overview gives some context on why OEM parts data matters for fleet reliability.

FAQ – Two Common Questions

Does this catalog include torque specs for assembly?

No. This is a parts catalog, not a service manual. It gives part numbers and exploded views only. For torque values, you need the Eaton FS-4005A service manual.

Can I use this catalog to order parts for a different Eaton model?

Each model has its own illustrated parts list. The FS-4005A catalog only covers that specific transmission. Do not use it for an RTLO series. You need the correct catalog for your transmission model. However, the format is identical across all Eaton Roadranger catalogs, so if you are familiar with one, you can navigate any of them. For a broader understanding of internal combustion engine principles that drive these transmissions, see Internal Combustion Engine.

Every parts counter in a heavy-truck dealer uses these same Eaton catalogs. You are buying the exact document they reference when you call in a part number. Ordering blind from an aftermarket book wastes time. Get the factory data on your screen. Access the Factory Manual now.