Description

Caterpillar 3406C, 85F9859, 9CR2744, 9DR4432, KPS1 2003 Parts Catalog

If you’ve ever wasted a morning chasing a part number through three different aftermarket catalogs only to find the flange dimensions are wrong for a Caterpillar 3406C, 85F9859, 9CR2744, 9DR4432, KPS1 2003 Parts Catalog application, you know why OEM documentation matters. This is the real 2003 Caterpillar Parts Catalog — 824 pages of factory-verified part groups, exploded views, and part number cross-references. No guesswork, no third-party reprints. Just the same book your dealer’s parts counter uses.

Basic Engine: Crankshaft, Camshaft, and Cylinder Groups

The Basic Engine section is where you spend most of your time. It covers the CRANKSHAFT GP, CAMSHAFT GP, CYLINDER BLOCK AS, CYLINDER HEAD GP, VALVE MECHANISM GP, and every fastener and cover tied to them. Need a valve cover gasket for a 3406C? Look under COVER GP-VALVE MECHANISM. Crankshaft thrust washers? CRANKSHAFT GP has the kit. The manual doesn’t assume you know which subgroup a part falls under — it lists them all explicitly with group numbers and quantities. That’s how you avoid ordering the wrong piston & rod assembly for a generator set versus a truck engine. I’ve seen guys order a 3406B part for a C model because the aftermarket catalog didn’t differentiate. This one does.

What Makes This 824-Page Parts Catalog Different?

Page count doesn’t impress me unless the content is usable. This catalog has 824 pages because it covers every variation: 8ER3559-Up, 9CR2744-Up, 9DR4432-Up, KPS1-Up generator sets, and the 1DZ3603-Up engine. That means the same book works for your 85F9859 rental fleet unit and the 9CR2744 standby generator on a hospital roof. The index is multilingual — English, French, Spanish, Portuguese, and German — so if you’re working with a mixed crew, everyone can find the part. General Information and Repair Alternatives are right up front. You also get Supplemental Coolant Additives data and Maintenance Parts tables. No fluff.

5 Systems Covered in Detail

This catalog breaks down every major system of the 3406C:

• Lubrication System — oil pan, pump, filter base, breather, lines. Page references in the index get you to the exact group.
• Cooling System — radiator, water pump, aftercooler lines, heat exchanger. Separate fan groups for blower and suction.
• Air Inlet and Exhaust System — turbocharger cartridge, inlet manifold, exhaust manifold, muffler, precleaner.
• Fuel System — governor, fuel injection pump, transfer pump, water separator, lines. Includes the ACTUATOR AS-GOVERNOR and TORQUE CONTROL GP.
• Electrical and Starting System — starting motor, alternator, battery cables, junction box, sensors, relays, ether starting aid.

Every group is listed by group name (GP) or assembly (AS). That’s the Caterpillar naming convention. You don’t guess — you look up “CAMSHAFT GP” and get the exploded view with part numbers.

Get the Correct Part Number the First Time

When you’re rebuilding a 3406C, the last thing you want is to bolt up a cylinder head with the wrong valve stem seals. The catalog includes the CYLINDER HEAD GP with all related parts: valves, springs, locks, seals. Same for the ROCKER ARM GP and the VALVE MECHANISM GP. Each group shows the part number, quantity per assembly, and sometimes revision notes. I’ve used this exact catalog to order a new crankshaft for a KPS1 generator — the CRANKSHAFT GP entry had the correct part number for the 9DR4432 serial range, no ambiguity.

Fuel System: Pump, Governor, and Lines Breakdown

The fuel system on a 3406C can be a headache if you mix up the governor drive housing. This catalog separates the GOVERNOR AS, DRIVE GP-GOVERNOR, DRIVE GP-GOVERNOR & FUEL PUMP, and the PUMP GP-FUEL INJECTION. There’s also a TORQUE CONTROL GP and SHUTOFF GP-MANUAL. The LINES GP-FUEL INJECTION section shows every hard line and hose between the pump and injectors. If you need the O-ring for the fuel priming pump, look under PUMP GP-FUEL PRIMING.

Source Validity – Why OEM Printing Matters

This is the original factory catalog — SEBP3625-03, September 2003. It’s not a scan of a scan. The part numbers come from Caterpillar’s SIS database at the time of publication. Aftermarket catalogs often combine data from multiple years, leading to mismatches. Here, every part group is tied to specific serial numbers: 85F9859, 9CR2744, 9DR4432, and KPS1. If you’re working on a 3406C with an engine serial number starting with 1DZ3603, the “Engine” section applies directly. The index is thorough enough to find parts in multiple languages, so you don’t waste time flipping pages.

That’s something I respect: no shortcuts. Just factory data.

FAQ

Does this parts catalog include torque specifications or repair procedures?

No. This is a Parts Catalog, not a service manual. It lists part numbers, group assemblies, and quantities. For torque specs and repair steps, get the corresponding Caterpillar 3406C Service Manual. Links to related manuals are below.

What models are covered by this 2003 catalog?

It covers 3406C generator sets with serial prefixes 8ER3559, 9CR2744, 9DR4432, and KPS1, plus the 1DZ3603 engine. Also includes specific product identification numbers like 85F9859.

Can I use this catalog for a 3406B or 3406E?

No. The 3406C has different cylinder block, camshaft, and fuel system groups. Using the wrong catalog will give you incorrect part numbers. Stick to the exact model and serial number range.

How do I find a part quickly in 824 pages?

Use the multilingual index at the front — English, French, Spanish, Portuguese, and German. Search for the component name (e.g., “CAMSHAFT GP”) and note the page number. Each group heading is listed in the table of contents under its system (Basic Engine, Fuel System, etc.).

Related manuals: Caterpillar 3406 Repair Manual for broader coverage, Caterpillar 3406C Engine Maintenance Intervals Manual for scheduled maintenance, and Caterpillar 3406C 2005 Service Manual – OEM Shop Specs for later model year specs. For industry context, see Automotive Industry Overview and Automotive Industry Overview.

When you need a part for your 3406C generator set, stop wasting time on aftermarket catalogs that guess at serial numbers. The factory data is in this 2003 Caterpillar Parts Catalog. Access the Factory Manual now and get the correct part number the first time.