Komatsu PC78UU-6 Parts Book PDF – Serial Number 22001 and Up

Description

Komatsu PC78UU-6 Parts Book PDF – Serial Number 22001 and Up

File Details

• Manual Type: Parts Book / Parts Catalog
• Brand: Komatsu
• Model: PC78UU-6
• Machine Serial Number Range: 22001 and up
• Engine Models Covered: S4D95LE-3A-2 (S/N 100001-UP), S4D95LE-2C (S/N 100005-UP)
• Language: English
• File Format: PDF
• Page Count: 212 pages

Chapters Covered

• S4D95LE-3A-2 Engine (S/N 100001-UP)
• S4D95LE-2C Engine (S/N 100005-UP)
• Engine Related Parts
• Cooling System
• Fuel Tank and Related Parts
• Electrical System
• Hydraulic System
• Main/Revolving Frame and Related Parts
• Operator’s Compartment and Control System
• Guard
• Swing Circle and Related Parts
• Travel and Lower Piping
• Under Carriage
• Work Equipment
• Marks and Plates
• Accessory
• Special Product
• Service Kit and Component Parts

The Komatsu PC78UU-6 Parts Book PDF for serial number 22001 and up is a complete illustrated parts catalog covering the S4D95LE-3A-2 and S4D95LE-2C diesel engines alongside the full PC78UU-6 excavator assembly. Every section is organized by major assembly group, with exploded-view illustrations keyed to item numbers and a matching table listing the exact part number, description, and quantity required. The engine sections alone span cylinder head, head cover, cylinder block, front cover, idler gear, flywheel housing, flywheel, crankshaft, piston and connecting rod, camshaft, tappet, rocker arm, oil pump, oil filter, fuel injection pump, injection nozzle, glow plug, solenoid, water pump, thermostat, turbocharger, muffler, air intake, exhaust manifold, and more. The machine-side sections cover the cooling package, fuel tank, full electrical system with harnesses and safety equipment, hydraulic tank, main pump, control valve, cylinders, swivel joint, travel motor, final drive, swing machinery, work equipment, and undercarriage.

What This Komatsu PC78UU-6 Parts Book Covers

This Komatsu PC78UU-6 parts catalog is divided into two major halves: the engine section for the S4D95LE-3A-2 and S4D95LE-2C power units, and the machine section for the PC78UU-6 excavator itself. The engine chapters break down the cylinder head and valve train, the cylinder block and rotating assembly, the front cover and gear train, the flywheel housing and flywheel, the lubrication system, the fuel injection system including the injection pump and nozzle holder assemblies, the cooling system with water pump and thermostat, and the air intake and exhaust components including the turbocharger and muffler. Component parts of each major assembly are itemized separately so you can identify exactly which washer, seal, o-ring, or bolt is needed for a rebuild.

The machine portion of this PC78UU-6 parts book covers the cooling system radiator and oil cooler package with all mounting hardware, the fuel tank with sub-tank and sensor assemblies, the complete electrical system including main harness, safety equipment, KOMTRAX harness, and floor frame wiring, the hydraulic system with hydraulic tank, main pump, PPC valves, lock valves, safety valves, attachment lines, return lines, oil cooler lines, swivel joint, travel motor, and final drive, the main and revolving frame, operator’s cab with monitor system and wiring, swing circle and swing machinery, lower hydraulic piping for travel, the undercarriage, work equipment including boom, arm, and bucket cylinders with all internal parts and service kits, and the marks and plates section.

How to Use This Parts Catalog

Each illustration page in this Komatsu PC78UU-6 parts book presents an exploded view of an assembly. Reference numbers on the drawing correspond to the item numbers in the accompanying table, where you will find the part number, description, and required quantity. Assemblies that are sold as complete units are marked with a leading dash, and sub-component parts are indented below. Serial number ranges are noted in the Options column so you can confirm a part fits your specific machine. Service kit part numbers are listed separately for major cylinders such as the boom cylinder, arm cylinder, bucket cylinder, and blade cylinder, allowing you to order a complete seal kit rather than individual components. This makes the PC78UU-6 parts book suitable for both routine part ordering and full component overhaul planning.

Because this PDF covers machine serial number 22001 and up, it applies to the PC78UU-6 model as produced from that serial break forward. The engine sections separately identify the S4D95LE-3A-2 engine from serial 100001 and the S4D95LE-2C engine from serial 100005, so you can match the engine parts to the actual unit installed in your machine. If you are servicing a PC78UU-6 within this serial range, this parts book gives you the part numbers and assembly relationships needed to order correctly the first time.

Why This Parts Book Belongs in Your Workshop

Having the right parts information on hand eliminates the guesswork of ordering by description alone. The Komatsu PC78UU-6 parts book PDF lets you identify a part by its position in the exploded view, confirm it belongs to your serial number range, and order using the exact Komatsu part number. Whether you are replacing a hydraulic hose, rebuilding a travel motor, resealing a cylinder, or tracking down a small o-ring in the fuel system, this catalog gives you the visual and tabular reference to do it accurately. The combination of illustrated assembly drawings and detailed part tables means you can trace every component from the top-level assembly down to the individual fastener.

This PDF is delivered instantly after payment, with no shipping and no waiting for a physical book. You can view it on any device, search through it, print the pages you need for the shop floor, and keep it on hand for every future repair or maintenance job on your PC78UU-6. The file covers the complete machine from engine to undercarriage, making it a practical reference for mechanics, parts managers, and owners who maintain their own equipment.

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