Caterpillar 951C 1974 Parts Catalog – Factory Parts Book for Traxcavator

If you are pulling a Caterpillar 951C 1974 Parts Catalog down from the shelf, you already know that the wrong part number costs time and money. I have seen guys order a fuel line three times because they guessed from a worn-out label. This book stops that. It is the factory-issued parts book for the 951C Traxcavator, serial number 86J2598-UP, published June 1974 by Caterpillar Tractor Co. 172 pages of exploded views, part numbers, and ordering instructions – not a reprint, not a scan of a scan. Original OEM document.

7 Major Sections in the 951C Catalog

The Quick Reference Guide inside the front cover splits the machine into seven major groups: Engine Related Items, Starting & Electrical System, Power Train-Power Transmission Unit, Steering Clutches & Brakes, Chassis & Undercarriage, Hydraulic System, Implements, plus Cab, Gauges & Accessories and Service Equipment & Supplies. Each group has its own page range. For example, Engine Related Items start on page 12 and cover the radiator, fan drive, muffler, fuel tank, governor control, and more. Starting and Electrical System begins on page 21, including the alternator, battery, wiring, and lighting system. No guesswork – you flip to the correct section, find the exploded diagram, and read the part number.

Starting & Electrical System: Factory Part Numbers

That alternator bracket that broke at 2,000 hours? Page 29 lists the exact part number for the 951C alternator (group 29 in the book). The battery box and grab iron assembly is on page 38. If you are chasing a wiring issue, page 34 shows the battery and wiring harness breakdown. Do not rely on aftermarket cross-reference charts that show you a part that “should” fit. This catalog was compiled by Susan McGehee from Caterpillar’s Publications Division. It matches the machine serial number.

Engine Related Items: Where the Parts Are

The Engine Related Items section covers everything from the radiator core protection grid (page 14) to the jacket water heater (page 14) to the fuel lines (page 19). If you need the fan drive assembly, that is on page 16. The muffler and prescreener are on page 17. And the torque converter cooler lines? Page 44. All part numbers are factory-original. When ordering, use the quantity and part name exactly as printed. The manual includes a note: “If in doubt about the part number, provide your dealer with a complete description of the needed item.” That is the right approach – do not guess, call with the book in hand.

Does This Catalog Cover the Hydraulic System?

Yes, and it does it right. The Hydraulic System section starts on page 86 and runs through page 116. It includes the pump-vane (page 86), lift cylinder (page 92), tilt cylinder (page 94), bucket positioner (page 99), kickout and conversion arrangements (page 101), and all hydraulic lines (page 111). If you need the service tank and valve, that is on page 104. For the loader frame and bucket control, see Implements section starting on page 117. Every part number comes from the same factory that built the machine. No aftermarket “universal” that leaves you with a bracket that doesn’t line up.

Understand the Quick Reference Chart

Inside the front cover is a Quick Reference Chart that lists the major sections with page numbers. Use it. The alphabetical index on page 3 also helps you find groups by name – “Transmission” leads you to page 40, “Planetary Transmission” to page 52, “Torque Converter” to page 42. There are conversion equivalent tables inside the back cover for bolt sizes, threads, and torque values. That alone can save you from stripping a critical fastener. The book is 172 pages. That is enough detail to cover every serviceable part on the 951C.

Source Validity – OEM vs Aftermarket

This is a genuine Caterpillar factory publication from 1974. Not a third-party compilation. The part numbers, illustrations, and ordering instructions were created by the manufacturer for their dealers. If you have seen parts catalogs put together by aftermarket houses that show a picture of a generic fuel filter and say “fits many models,” you know why this matters. The 951C parts catalog shows the exact Caterpillar part number – no cross-references, no “equivalent.” If you are rebuilding a 951C, you need the factory book. Period. Related manuals: Caterpillar 951C 1976 Parts Catalog covers later serial numbers; Caterpillar C15 2006 Parts Catalog – Factory OEM 884 Pages for engine parts; Caterpillar Elevated Sprocket Tractors Parts Catalog – 971 Pages undercarriage details. For background on the automotive industry, refer to Automotive Industry Overview and Automotive Industry Overview.

FAQ

Is this a service manual or a parts catalog?

Parts catalog. It lists part numbers, quantities, and exploded views. For repair procedures, you need the corresponding service manual.

What serial numbers does this cover?

This edition covers 951C Traxcavator serial number 86J2598-UP, published June 1974. Check your machine serial plate on top of the bevel gear case.

Can I use this to order parts for a 951B or 951?

No. Caterpillar changed part numbers frequently between models. Using the wrong book will get you a part that does not fit. Order the correct catalog for your serial number.

What is included in the Engine Related Items section beyond the engine block?

Air cleaner, fan drive, fan and guard-blower, fuel lines, fuel tank, governor control, jacket water heater, muffler, prescreener, protection cover, radiator, radiator core protection grid, engine mounting hardware, and more. All on pages 12-20 with individual part numbers and quantities.

Do not trust generic online parts lists for a 50-year-old machine. The OEM parts book is the only source that shows exactly what Caterpillar put on the 951C. Download the Factory Manual now and keep a copy in your tool box.