Description

Caterpillar 938G II 2005 Parts Catalog – Factory OEM Part Numbers and Exploded Views

Ever ordered a part based on an aftermarket cross-reference, waited three days, then stared at a bracket that doesn’t fit? I’ve seen that in my shop more times than I can count. You lose billable hours, the machine sits, and the customer stands over your shoulder. That is why you need the Caterpillar 938G II 2005 Parts Catalog – the factory-issued book that shows you exactly which part goes where, with the correct part number and exploded diagram. This isn’t some scanned rehash. This is the OEM publication from Caterpillar, 614 pages thick, covering the 938G II Wheel Loader with the 3126B engine.

I’ll tell you straight: if you are maintaining or rebuilding one of these loaders, you cannot afford to guess on parts. The aftermarket cross-reference websites are fine for generic filters and belts, but when you need a hydraulic seal, a transmission gear, or a specific bolt from the torque converter group, you need the factory diagram. This catalog includes the serial number ranges: CRD1-Up for the machine, 5GG1-Up for the engine, FWS1-Up and WNF1-Up for the transmission, TCC1-Up and TCT1-Up for the torque converter. You look up your machine’s serial number, find the group, and there is the correct Caterpillar part number. No guesswork.

Serial Number Identification – Matching Parts to Your Machine

Before you order anything, you need to know which serial number range your loader falls into. The first few pages of this catalog (page 3 shows the product information sheet) let you record your machine’s model, PIN, engine serial, transmission serial, and attachment serials. I keep that sheet in the glove box of every loader I work on. Why? Because two 938G II loaders side by side might have different transmissions or engines depending on production date. This catalog covers six distinct serial number prefixes: CRD1, 5GG1, FWS1, WNF1, TCC1, and TCT1. If you try to use a parts list from a different serial range, you will order the wrong hydraulic pump – I have seen it happen. Save yourself the restocking fee.

Does This Catalog Cover the 3126B Engine?

Yes. The 3126B engine powers this loader, and the catalog includes the complete engine parts breakdown. You get the cylinder head group, fuel system, lubrication, cooling, and all the gaskets and seals. The manual notes that this is Volume II (pages 467-1004), so it concentrates on the heavier drivetrain and chassis components – but the engine section is thorough. If you are doing an in-frame overhaul, you can find every piston ring, bearing, and valve stem seal listed with its part number and quantity per engine. That is the kind of detail you need when the machine is torn apart on your shop floor.

614 Pages of Exploded Diagrams and Part Numbers

This catalog is 614 pages. That is not a typo. Each page is a full factory diagram with callouts to every component. The index is organized by group number, so you can go directly to the hydraulic system, the torque converter, the axle housing, or the operator station. The diagrams are exploded views – they show how parts fit together, which is critical when you are reassembling a complex assembly like the steering control valve. I have used aftermarket parts manuals that omitted one washer in the stack, and the whole valve leaked. Caterpillar’s own parts catalog does not skip details. CATERPILLAR 938G II 2005 Parts Catalog is the only version I trust for my shop.

Source Authenticity – Factory OEM Publication

This is the actual Caterpillar publication, printed in May 2005, with the SEBP3498-26 document number. It comes from the company that built the machine. The aftermarket parts catalogs you find on some websites are compiled from multiple sources – sometimes they copy old pages, sometimes they guess the part number based on supersessions. That leads to wrong parts. I spent a whole afternoon once chasing a brake piston that the aftermarket cross-reference said was common with a D4H – it was not. The OEM catalog shows the exact part number for the 938G II brake group. Do not settle for a reprint. Automotive Industry Overview

How to Use This Parts Catalog on the Job

Step one: write down your machine’s serial number. Step two: open the catalog to the group index (around page 8). Step three: find the system you are working on – say, the torque converter. The diagram shows each part with an index number; the list next to it gives the Caterpillar part number, description, and quantity required. I always double-check the quantity – some diagrams call for two bushings when you think it needs one. Then order from your dealer or online parts counter using that factory number. If you need a related manual for another machine, check out Caterpillar C15 2006 Parts Catalog – Factory OEM 884 Pages or Caterpillar Elevated Sprocket Tractors Parts Catalog – 971 Pages for tracked equipment. For more context on why factory documentation matters, read the Automotive Industry Overview.

Can I use this catalog to find torque specs?

No, this is a parts catalog, not a service manual. It lists part numbers and diagrams. You need the separate service manual for torque values and repair procedures.

Does this catalog include the hydraulic system breakdown?

Yes. The hydraulic system section covers the main pump, control valves, cylinders, hoses, and fittings. Each component has its own exploded diagram with part numbers. That is over 100 pages in the catalog.

What format is the file?

The file is a PDF, originally released on CD-ROM by Caterpillar (form SEBP3498). It is searchable, printable, and works on any device. No DRM, no restrictions – just the factory file.

How do I know which parts supersede?

The catalog includes the part numbers as of the publication date. For newer supersessions, you need to check with your Caterpillar dealer using the part number from this catalog. The dealer can tell you if a later part replaces it. Always start with the OEM number.

That is the reality of keeping these loaders running. The right part number saves you hours of waiting and rework. I have been torqueing head bolts since before some of you were born, and I will tell you this: the difference between a job that goes smooth and one that fights you all day is having the correct information before you start. Access the Factory Manual from AutoRepairManuals, get the genuine Caterpillar 938G II Parts Catalog, and keep it on your tablet or print out the pages you need. Your wallet and your patience will thank you.