2004 Caterpillar 320C / 320C L Track-Type Excavator Parts Manual (P/N XEBP7956-03)

Caterpillar publication XEBP7956-03, issued December 2004, is a parts manual for the 320C and 320C L Track-Type Excavators powered by the 3066 engine. It supports parts identification and repair planning for the listed serial ranges; it does not contain step-by-step service or troubleshooting procedures.

• Basic engine: Illustrated breakdowns of the cylinder head, valve mechanism, cylinder block, crankshaft, and piston and rod groups, including alternative component sizes.

• Fuel, cooling and air systems: Fuel injection pump and injector nozzle components, radiator and oil cooler assemblies, aftercooler, fans, air cleaner, and turbocharger parts.

• Hydraulic system: Main pump and control-valve parts, boom, stick and bucket cylinders, swing drive, travel motors, and swivel assemblies.

• Power train and undercarriage: Final drive components, sprockets, track links, idlers, track rollers, track guides, and track adjuster and recoil groups.

• Electrical and starting system: Cab and console wiring groups, harness connector parts, starter motor, charging alternator, electronic controls, and operator monitor assemblies.

• Implements, frame and operator station: Boom and stick configurations, bucket linkages, counterweights, guards, cab assemblies, seats, heating, and air-conditioning components.

This catalog is suited to mechanics and parts staff who can match machine serial numbers and installed assemblies to illustrated parts lists.

Parts Arrangement and Serial Changes

Assembly captions connect each illustration to its applicable serial range and related subassemblies. The introduction explains First Type and Second Type distinctions, along with indented entries that identify serviceable components within larger assemblies.

The main control-valve listing changes from group 158-8200 to 250-2488 at FBA 03403-Up, GAA 00484-Up, MAA 00314-Up, and PAA 00341-Up. Matching that production break helps select the correct valve-group components and repair kits.

The Replacement Items chart brings together belts and common filters. Alphabetical and part-number indexes provide separate routes to a component by name or known part number.

Engine, Fuel and Cooling Components

Engine assembly data identifies valves, pistons, connecting rods, and lubrication-system components. The Piston & Rod GP illustration separates the piston, rings, pin, rod, and bearings; the parts list distinguishes components supplied as sets.

The fuel section includes Nozzle GP-Unit Injector and fuel injection pump breakdowns with internal parts and selection shims. Cooling drawings identify radiator and oil-cooler cores, aftercooler components, hoses, and clamps, while the air inlet and exhaust groups detail manifolds, the muffler, and turbocharger cartridge.

Hydraulic Assemblies and Attachment Matching

Pump GP-Main Hydraulic includes section views; Drive GP-Swing, Final Drive GP, and Swivel GP identify their internal assemblies. Control-valve parts lists also identify repair kits for individual boom, stick, bucket, travel, and swing functions. These are component drawings and parts references, not hydraulic circuit schematics.

Attachment listings distinguish R-Boom and M-Boom arrangements, matching stick families, and Long Reach Front equipment for GAA machines. Auxiliary control listings separate single-function, double-function, and combined-function configurations.

High-pressure hydraulic systems and heavy components require proper training. Use the applicable service instructions and qualified technical support for teardown or parts replacement.

Wiring Groups and Cab Variants

Harness AS-Wiring drawings identify connector components, branch destinations, and wire colors. Cab and console wiring views show installation and component placement; they are not full-machine electrical circuit schematics.

Cab options include skylight and metal roof hatches and an electrically opening front windshield. Seat and heater components have separate breakdowns, and the air-conditioning listings include a swing-out condenser option.

Examples of Engine Component Sizes

These are a few of the component sizes cataloged for the 3066 engine. The Piston & Rod GP lists pistons and ring sets in standard size and 0.25 mm or 0.50 mm oversize.

The Cylinder Block GP lists bearing sets in standard size and 0.25, 0.50, or 0.75 mm undersize. These are parts-selection sizes, not clearance specifications or wear limits.

Text Search, Bookmarks and PDF Contents

Finding parts and reading drawings: Spaced lettering limits searches for individual part numbers; group headings and descriptions are searchable. The cover and many drawing labels have no searchable text. Bookmarks reach catalog pages and indexes; Main Menu references a separate file. Zooming helps with small connector and wire-color labels.

The download is one printable, English-language 1,229-page PDF. That total includes 15 front-matter pages including the cover, 1,052 parts-catalog pages, 68 Memoranda pages, and a 94-page part-number index.