Komatsu PC78US-8 Excavator Parts Book SN 15001-Up PDF Download

Description

Komatsu PC78US-8 Excavator Parts Book SN 15001-Up

This is the complete illustrated parts catalog for the Komatsu PC78US-8 excavator, published for machines from serial number 15001 upward. Every assembly on the machine is broken down into exploded views with index numbers, and each number is tied to a Komatsu part number, description, quantity and the serial number range it applies to. If you need to order the correct part the first time, or you simply want to understand how an assembly is put together before you pull it apart, this is the document that gives you that answer.

The book covers the engine (SAA4D95LE-5G, engine serial 504574-UP) and everything mounted around it, then moves outward through the cooling, fuel, electrical and hydraulic systems, the revolving frame, the operator’s compartment, guards and covers, the swing circle, travel system, undercarriage, work equipment, decals and plates, auxiliary parts and the field repair service kit. Because it is organized by system rather than by repair procedure, it doubles as a quick visual reference for hose routing, bracket positions, clamp locations and how a component is fastened to its neighbour.

What Is Inside This Komatsu PC78US-8 Parts Book

The catalog is arranged into numbered sections, each with its own unit breakdown and exploded illustration. The index at the front of the book lists the sections you will find inside, and each section opens with a unit table so you can jump straight to the assembly you need.

Chapters Covered

• Engine Related Parts — coupling, engine mounting, air cleaner mounting, damper
• Cooling System — radiator, aftercooler and oil cooler, fuel cooler, net, piping, sub-tank, mounting, cooling fan guard
• Fuel System — fuel tank, drain piping, suction piping, return piping, fuel filter mounting, water separator, additional fuel filter mounting
• Electrical System — battery, battery with disconnect switch, electric wiring harness, wiring harness clamps for engine, alternator, control valve, floor frame, fuse holder, battery relay and ground cable, horn, front working lamp, travel alarm
• Hydraulic System — hydraulic tank, control valve (6-valve, 7-valve, 8-valve variants, with and without blade, with 1-service valve, with 1-additional actuator piping), hydraulic pump (with and without blade), suction piping, delivery piping, oil cooler piping, return piping, drain piping, boom piping, arm and bucket piping, additional actuator piping, blade piping, travel piping, swing piping, solenoid valve, PPC valve piping, control pattern change over valve, plate and case
• Frame and Its Related Parts — revolving frame, revolving frame with battery disconnect switch, boom foot pin
• Operator’s Compartment and Control System — operator’s seat, seat belt, operator’s seat rear cover, cab (cab body and window, front window, front lower window, roof ventilator, door, door lock, door open lock, wiper and room lamp, radio wiring harness, roof cover and hanger, air intake and grip, plugs, KOMTRAX antenna, KOMATSU mark, rear cover and rear duct, KOMTRAX controller), head guard, front guards, floor mat, sunvisor, window washer tank, air conditioner unit, fire extinguisher, floor frames for the various blade and radio configurations, floor mounting, front cover
• Guards and Covers — hood (with and without dust-proof net), left side cover, right side cover, machine cab partition, battery case, front cover, rearview mirrors, counterweight and additional counterweight, counterweight cover, under cover
• Swing Circle and Its Related Parts — swing circle, swing machinery and motor, swivel joint (with and without blade)
• Travel System and Its Related Parts — travel piping, travel motor and final drive (sprocket, travel motor inner parts, bolt)
• Undercarriage — front idler, idler cushion, track roller, carrier roller, track shoe assemblies in several widths and shoe types, track link assembly, track frame variants, track frame cover, track frame under cover, track guard and track roller guard
• Work Equipment — boom variants, boom cylinder, arm cylinder, arm lengths (1650 mm, 2250 mm), bucket cylinder, bucket linkage, bucket pin, buckets in multiple capacities and widths, blade variants, blade cylinder
• Marks and Plates — machine marks and plates in English, Spanish, Turkish-English and EU configurations, lifting capacity charts, caution plates, FOPS and ROPS plates, rivets, accumulator plate
• Auxiliary Parts and Tool — spare parts kit, cap and overall, general tool set
• Field Repair Service Parts — service kit parts including travel motor kit, shoe bolt and nut kits, boom cylinder kit, arm cylinder kit, bucket cylinder kit, blade cylinder kit

Taken as a whole, this Komatsu PC78US-8 parts book gives you the full component-level map of the machine. Each exploded view shows you the order parts sit in, which is often the only reliable way to work out how a bracket, spacer or seal is oriented once it is off the machine. The part number tables underneath each figure tell you the exact Komatsu number, the description, how many are required, and which serial number break the number applies to. That serial-number column is the part that saves the most money, because Komatsu changed components mid-production and a part that fits a 15001 machine will not always fit a later one.

Who This Parts Catalog Is For

Machine owners running a PC78US-8 in a fleet will use this to look up consumables and fasteners without a trip to the dealer. Independent mechanics and repair shops use it to identify a part from a customer’s description or from a photograph of the broken component. Parts departments and resellers use it to confirm a number before quoting, and to cross-check whether a number has a serial-number restriction. Restorers and rebuilders use the exploded views to plan a teardown sequence and to make sure nothing is left over at reassembly. Anyone buying a used PC78US-8 benefits as well, because knowing the exact part numbers makes it easy to price a repair before committing to the machine.

Why the Serial Number Ranges Matter

The coverage in this book is stated as serial number 15001 and up, and the engine is listed as SAA4D95LE-5G with engine serial 504574-UP. Throughout the catalog you will see serial number annotations next to individual part numbers, and separate figures for ranges such as 15001-15739, 15740-, 15001-16106, 16107-, 15001-15487, 15488-, 15506-16832 and 16833-. These are not decorative. They mark the exact point where Komatsu substituted a component, changed a seal, altered a pipe run or added a bracket. Buying against the wrong range is the single most common cause of a part arriving that does not fit. Having the ranges visible in the same table as the number lets you select correctly in one pass.

What You Can Do With It

• Identify any assembly on the PC78US-8 by section, figure number and index number
• Look up exact Komatsu part numbers, descriptions and quantities per assembly
• Confirm which serial number range a given part number applies to before ordering
• Trace hose, pipe, tube and clamp routing on the boom, arm, travel, swing, return, drain and oil cooler circuits
• Find the correct seals, O-rings, back-up rings and washers shown in each exploded view
• Read off fastener sizes, bolt and washer part numbers, and quantities for a rebuild
• Work through the control valve in 6-valve, 7-valve and 8-valve forms, and the blade and additional-actuator variations
• Break down the swing machinery and motor, travel motor and final drive, swivel joint and front idler into their individual parts
• Identify undercarriage components across the different track shoe and link options
• Match decals, plates, warning labels and lifting capacity charts to the machine configuration
• Locate field repair service kit contents for the cylinders and travel motor

Document Details

• Manual type: Illustrated parts catalog / parts book
• Brand: Komatsu
• Model: PC78US-8 excavator
• Serial number coverage: 15001 and up
• Engine: SAA4D95LE-5G, engine serial 504574-UP
• Language: English
• Pages: 1106
• Format: PDF
• Sections: Engine related parts, cooling system, fuel system, electrical system, hydraulic system, frame and related parts, operator’s compartment and control system, guards and covers, swing circle and related parts, travel system and related parts, undercarriage, work equipment, marks and plates, auxiliary parts and tool, field repair service parts

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Instant PDF Delivery

The Komatsu PC78US-8 Excavator Parts Book for serial numbers 15001 and up is delivered as a PDF the moment your order is complete. There is no shipping, no waiting and no physical book to store. Open it on a laptop in the workshop, on a tablet next to the machine, or on a phone out on site. Print the single figure and part table you need for the job in front of you, mark it up, and keep the rest of the catalog clean. Because every section, figure and part table is present, you have the full parts reference for the PC78US-8 in one file — the same information you would otherwise be hunting through a paper catalog for, ready whenever a part number needs to be confirmed.