Caterpillar 938G II 2005 Parts Catalog

If you’re tearing down a Caterpillar 938G II and you don’t have the factory parts catalog, you’re working blind. I’ve seen guys order the wrong hydraulic line three times because they thought “it looks about right” – then the machine sits for a week while they wait for the return. This 2005 Parts Catalog is the straight-up OEM document, not some aftermarket scan with missing pages and blurry illustrations. It runs 678 pages, covers serial number prefixes CRD1-Up (machine), 5GG1-Up (engine), FWS1-Up and WNF1-Up (transmission), plus TCC1-Up and TCT1-Up for the torque converter. That’s the level of detail you need to order parts that actually fit.

Engine Parts: 3126B Diesel Coverage

The 938G II runs a 3126B engine, and this catalog breaks down every gasket, piston, injector, and seal. You get exploded views with callout numbers that match the part list on the facing page. Each component has a factory part number – no cross-referencing needed. I’ve used these drawings to find a #10 o-ring that the local dealer swore was discontinued. It wasn’t; the part number was right there on page 112 of the engine section.

Transmission and Torque Converter – What’s Listed?

Two transmission builds (FWS and WNF) and two torque converter options (TCC and TCT) are covered with separate sections. You’ll find gear sets, clutches, shafts, and the converter stator. The manual lists the exact bearing and seal kit numbers for each variant. If you’re rebuilding a transmission, you need to match your serial prefix to the right illustration – this catalog makes that clear with a table at the start of each group.

7 Main Assembly Groups in the Catalog

The catalog is split into logical groups: engine, powertrain, hydraulics, frame and wheels, cab and controls, electrical, and attachments. Each group starts with a general information section that explains how to use the parts lists. This layout saves time because you go directly to the system you’re working on instead of flipping through a generic index.

Factory Specs: Why You Need the OEM Numbers

Aftermarket catalogs often combine multiple years into one drawing, which means you end up with a part that looks right but has the wrong bolt pattern. This Caterpillar 938G II 2005 Parts Catalog is the original factory print – Caterpillar Form SEBP3498-26, dated May 2005. The torque specifications for fasteners are listed in lb-ft, and fluid capacities are in quarts and gallons. Every dimension is given in inches or fractions. That level of precision is what keeps threads from stripping and seals from leaking.

Download and Use the Parts Manual Correctly

Start by recording your machine’s serial numbers into the blank forms on page 3. The manual includes product and dealer information pages – fill them out before you flip to the parts section. Then use the numeric index in the back of the book to find any part number you already have. If you’re ordering from a dealer, give them the exact part number from this manual. Don’t describe the part; give them the number. You’ll get the right piece the first time.

Source Authenticity – No Third-Party Reprint

This is a direct digital copy of the official Caterpillar parts manual. It’s not a photocopy of a manual that’s been through three shops and lost the last 50 pages. The PDF is searchable, and the image quality is sharp enough to read the tiny font on fastener callouts. If you’ve ever tried to read a blurry JPEG from a forum, you know the difference. You get 678 pages of clean OEM content.

Can I use this catalog to order parts for a 938G (non-II)?

No. The G II has different axles and a different cab structure.

How do I cross-reference a part number from the online parts system?

The catalog includes a numeric index and illustration groups. You look up the part in the illustration, note the reference number, then find the corresponding part number in the list. Make sure you check the serial number prefix (CRD1-Up, 5GG1-Up, etc.) because Caterpillar changed parts across production runs. If you order based on a picture alone, you’ll get the wrong part every time. Use the index at the back of the manual to verify supersessions – the factory includes notes like “use X in place of Y” when parts are updated.

Stop wasting time with generic part lookups that leave your machine down. Get the real document that a Caterpillar engineer signed off on. Download the Factory Manual and keep it on your tablet or printed in the shop.

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For a broader look at heavy-equipment documentation standards, see Automotive Industry Overview. If you’re curious about how Caterpillar’s parts numbering system fits into the larger manufacturing world, Automotive Industry Overview provides useful background.