Caterpillar 320C, 320C LU 2008 Service Manual – 1111 Pages of OEM Specs

Description

Walk into my shop and you’ll see a stack of aftermarket parts catalogs in the trash. That’s what happens when a guy guesses on a seal kit for a 320C and the boom drifts two days later. The Caterpillar 320C, 320C LU 2008 Service Manual is what I pull when I need the exact part number, not a range of ‘maybe fits.’ It’s 1111 pages of factory documentation from Caterpillar, covering the 320C and 320C LU track-type excavators powered by the 3066 engine. This is the same binder the dealer parts counter uses. If you are rebuilding a swing gear or tracking down a hydraulic hose, you need the serial number breakdown on page 1 and the parts identification system on page 2. Start there.

Skip the guesswork. Use the manual as intended.

How to Use the Parts Manual

Page 2 gives you the entire method. Captions under each illustration list the part number and group name. If multiple illustrations exist for a group, the caption calls out specific serial number ranges or ‘First Type’ / ‘Second Type’. Pay attention to the effective date codes like D95.05 for May 1995 or T00.05 for May 2000. This manual uses them to track engineering changes. Indented part names mean that item bolts into the larger assembly above it. That’s how you avoid ordering a component that comes already attached. Each group is numbered – from 11 up to 532 – and the index in the front points you to the correct page.

Model View: Matching Your Machine

The ‘Model View’ section helps you identify your exact configuration. The 320C LU has a long undercarriage – that changes track roller count and frame parts. If you order parts for a standard 320C and you have an LU, you’ll be wrong. This manual’s model view diagrams show the differences. Check your serial number prefix (FBB or GAB) against the illustrations on page 1. Then use the ‘Model View’ bookmark to find your machine’s specific group. Caterpillar provides separate illustrations for each variant, so you don’t have to guess.

Captions and Indented Part Names

Captions are not decoration. They tell you the page number for sub-assemblies and the effective serial number range. For example, a caption might say ‘D95.05-‘ meaning the part applies from May 1995 onward. Indented part names in the parts list indicate a sub-component. If you see a bolt listed indented under a valve body, that bolt is part of the valve assembly – not separate. This matters when you’re ordering a repair kit and the kit includes those bolts. Don’t order them individually. The manual uses abbreviations like N/S for Not Serviced and AS for Assembly – all explained in the abbreviations section.

What the 1111 Pages Cover

The manual is divided into groups – from 11 (engine) all the way to 532 (attachments). Groups like 77 (likely swing drive) and 95 (likely track frame) have sub-sections like 95A, 95B, etc. Each group has its own illustration and parts list. You’ll find everything from the radiator (group 18) to the operator cab (group 60). The ‘List of Attachments’ section covers all the optional tools – thumbs, quick couplers, auxiliary lines. If your machine has a hydraulic hammer line, that group is where you look. This manual does not skip anything. It also includes a ‘Replacement Items’ section for wear parts like filters and seals.

List of Attachments: Standard and Optional

Caterpillar built these machines with a lot of options. The ‘List of Attachments’ index in the front helps you find the correct group for any added equipment. For example, if the machine has a boom cylinder with an integral line, the attachment code will point you to the right illustration. Don’t rely on the generic parts site – use this manual’s attachment list. It’s organized by function and serial number effectiveness. Your dealer might not have this level of detail for every build. The manual also shows wire color abbreviations (RD for red, WH for white) for electrical harness identification.

If you need training materials, check the Caterpillar 312C 315C 320C 322C 325C Technical Training manual. For earlier models, consider Caterpillar 320C 320C L 2004 Service Manual or Caterpillar 320C 2001 Service Manual. And if you’re also working on truck transmissions, the Manual Transmission section on our site covers gearboxes – not hydraulic drives, but still requires proper lubrication specs. The Manual Transmission knowledge helps when dealing with powertrain components on other equipment.

Frequently Asked Questions

Does this manual include torque specs?

No. This is a parts manual, not a service manual. It identifies parts and part numbers. For torque values and repair procedures, you need the separate service manual for the 320C.

Can I use this manual for a 320C without the LU?

Yes, but pay attention to the model view. The standard 320C and the LU share most components, but track frame and final drive parts differ. The manual has separate illustrations for each, identified by serial number and model. If you skip checking the ‘Model View’ section, you risk ordering the wrong undercarriage parts. The index also lists attachments that may or may not be present. Always cross-reference your machine’s serial number with the caption notes. The manual’s captions include effective date codes that indicate when a part changed, so even within the same model you might need a different part after a certain production month.

Ready to work without the guesswork? Access the factory manual from AutoRepairManuals – your machine’s part numbers are waiting.