Komatsu PC138US-8 Excavator Parts Book PDF – S/N 20001-Up Illustrated Parts Catalog

Description

Komatsu PC138US-8 Excavator Parts Book – S/N 20001-Up

This Komatsu PC138US-8 Parts Book is the complete illustrated parts catalog for the PC138US-8 hydraulic excavator from serial number 20001 and up, including the variants built on that platform. Every major assembly on the machine is broken down into exploded illustrations with numbered callouts, and each callout is matched to a parts table listing the part number, part name, quantity, and serial number range where a change occurred. The engine-specific content in this catalog applies to the SAA4D95LE-5A-W diesel engine from serial 500001-up.

File Details

• Manual type: Illustrated Parts Book / Parts Catalog
• Brand: Komatsu
• Model: PC138US-8
• Serial number range: 20001-Up
• Engine: SAA4D95LE-5A-W (S/N 500001-Up)
• Language: English (with Japanese assembly labels on illustrations)
• Page count: 678 pages
• File format: PDF

Chapters Covered

• Coupling and Main Pump Mounting Parts; Engine Mount; Engine Mount (Mount Bracket)
• Air Cleaner (Except Japan); Corrosion Resister
• Cooling: Radiator and Frame, Oil Cooler, After Cooler and Shroud, Fuel Cooler, Radiator and After Cooler Piping, Sub Tank, Radiator Mount, Fan Guard
• Fuel Tank; Fuel Tank (Fuel Refill Pump); Fuel Line; Fuel Line (Additional Filter); Fuel Line (Clip); Fuel Line (Remote Drain); Fuel Line (Pre-Filter); Fuel Line (Additional Filter)
• Battery and Mounting; Battery and Mounting (Large Capacity); Vehicle Electrical – Starting Harness, Main Harness Clamp (1/5-5/5), Switch and Sensor, Relay, Engine Relay Mount Bracket, Additional Work Lamp, Beacon Lamp, Horn, Travel Alarm, Rear View Camera
• Hydraulic Tank; Main Valve; Main Valve (1-Attachment, Blade, 1-Attachment and Blade, 2-Attachment, 2-Attachment and Blade); Main Pump; Oil Cooler Line; Drain Line; Boom Line; Arm and Bucket Line (1/3, 2/3, 3/3); Attachment Line; Quick Coupler (Boom Piping, Arm Piping, Reinforced Type, Valve Piping); Swing Line; L.S. Line; Solenoid Valve Line; Connecting Valve
• Revolving Frame; Revolving Frame (For Blade, EU Spec); Boom Foot Pin
• Operator’s Seat (Tilt and Suspension); Seat Belt; Seat Rear Cover; Operator’s Cab (Cab, Front Window, Front Lower Window, Roof Window, Door, Door Lock, Door Roller, Door Catch, Wiper and Room Lamp, Radio Wiring, Roof Cover and Air Intake, Accessories, Controller, Air Conditioner Sub Plate, Monitor Cover); Top Guard; Front Guard (Full and Half Guard); Floor Mat; Rain Visor; Sun Visor; Window Washer; Air Conditioner (Duct, Compressor and Condenser, Hose, Sensor and V-Belt); Extinguisher; Floor Frame (Travel Control Valve, Foot Rest, Base, Floor Harness, Electrical, Relay and Diode, Harness Clamp, Lever and Valve, Console, Starter Key, Switch, Air Conditioner Unit, Heater Hose, P.P.C. Piping and Clamp, P.T. Block, Attachment Controls, Blade Control)
• Guard: Hood, Frame, Side Cover L.H. and R.H., Partition Cover, Cover Upper, Case Right Side, Front Cover, Handrail, Rear View Mirror, Counter Weight, Additional Counter Weight, Under Cover
• Swing Circle; Swing Machinery (Related Parts and Mounting Parts); Swivel Joint (For Blade)
• Travel and Lower Piping: Travel Piping Lower (Standard, For Blade, Power Up Type), Final Drive (Power Up Type)
• Under Carriage: Front Idler, Idler Cushion, Track Roller, Carrier Roller, Track Shoe (Triple Grouser with Hole 500/600/700 mm, Road Liner 500 mm), Track Frame (For Blade and Track Roller Guard variants), T/F Under Cover, Idler Guard, Track Frame Additional Step
• Work Equipment: Boom, Boom Cylinder, Boom Cylinder Top Pin, Arm Cylinder, Arm, Long Arm, Short Arm, Bucket Cylinder, Bucket Link, Bucket (0.16M3 through 0.50M3, vertical and horizontal pin types), Blade, Blade Cylinder
• Marks and Plates (English EU Spec, Except Japan, For USA, KUK Offset Boom Spec); Plate (Lifting Capacity); Plate (Fire Prevention Check Sheet); Caution Plates
• Accessory: Spare Parts, Cap and Overall, Tool Kit
• Service Kit and Component Parts: Shoe Bolt and Nut Service Kit, Track Link Assembly, Main Pump (1/9 through 9/9), Boom Cylinder (Inner Parts), Arm Cylinder (Inner Parts), Bucket Cylinder (Inner Parts), Blade Cylinder (Inner Parts), Swivel Joint (Inner Parts), Swing Motor (1/2, 2/2), Travel Motor (GM23VL and GM21VA types), Main Valve (1/24 through 24/24), Main Valve (1-Attachment) (1/27 through 27/27), Main Valve (Blade) (1/24 through 24/24), Main Valve (1-Attachment) (Blade) (1/27 through 27/27), Main Valve (2-Attachment) (1/30 through 30/30), Main Valve (2-Attachment) (Blade) (1/30 through 30/30), PPC Valve (For Travel, Work Equipment, 1-Attachment, 2-Attachment, Blade), Safety Valve, Burst Valve (For Arm Crane, For Boom Cylinder)

This Komatsu PC138US-8 parts book is the same illustrated style of catalog used at the parts counter: exploded views of each major assembly paired with numbered part tables. Because it covers the full serial range from 20001-up, entries that changed during production are separated by serial number so you order the correct part for the exact machine rather than a generic substitute. Sections are organized by machine system – engine mount, cooling, fuel, electrical, hydraulics, operator’s compartment, guards, swing, travel, undercarriage and work equipment – and the Service Kit and Component Parts section goes down to the sub-assembly level for pumps, motors, valves and cylinders.

What This Komatsu PC138US-8 Parts Book Lets You Do

A parts book saves time and money on any repair that involves replacing components. Instead of photographing a broken part, calling a dealer and hoping the person on the other end identifies it correctly, you look up the illustration for the assembly, match the callout to the part table and have the number in hand. On the PC138US-8 this matters most on the hydraulic side, where dozens of similar-looking elbows, unions, O-rings and hoses sit within a few cubic feet of each other, and on the undercarriage, where track shoes, links, bushings and seals differ by width and configuration.

The catalog also helps on the electrical side of the machine, where it covers the main harness clamps, the starting harness, switches, sensors, relays, work lamps, beacon lamp, horn, travel alarm and rear view camera. Because the electrical system is drawn as separate harness and clamp illustrations, you can identify connectors, brackets and protective clips as well as the main components.

For the operator’s compartment, this Komatsu PC138US-8 catalog covers the seat (tilt and suspension variants), seat belt, seat rear cover and the full cab group – front window, front lower window, roof window, door, door lock, door roller, door catch, wiper and room lamp, radio wiring, roof cover and air intake, accessories, controller, air conditioner sub plate and monitor cover. The floor frame is broken out by function, including travel control valve, foot rest, base, floor harness, electrical, relay and diode, harness clamp, lever and valve, console, starter key, switch, air conditioner unit, heater hose, P.P.C. piping and clamp, P.T. block and attachment and blade controls. Guards and mirrors are covered separately, including top guard, front guard (full and half guard), rain visor, sun visor, window washer, rear view mirrors, counterweight, additional counterweight and under covers.

The last section, Service Kit and Component Parts, is the deepest part of the document. It breaks down the main pump across nine pages, the main valve across twenty-four pages for the base configuration and across twenty-seven or thirty pages for the attachment and blade configurations, plus the PPC valves, safety valve, burst valve, swing motor, travel motor (GM23VL and GM21VA types), swivel joint and all four cylinders. If you are rebuilding a hydraulic component, this is where you find the seal kits, O-rings, back-up rings, springs and internal parts.

Why the Right PC138US-8 Parts Book Matters

Ordering the wrong part on a Komatsu excavator is expensive in both money and downtime, and the PC138US-8 has enough build variants – blade, no blade, one attachment, two attachments, EU spec, Australia spec, KUK offset boom – that a single generic number will not cover every machine. This parts book separates those variants so the number you look up matches the machine in front of you.

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Instant PDF Delivery

The Komatsu PC138US-8 Parts Book is delivered as an instant PDF download. There is no shipping, no waiting for a physical book and no risk of a printed copy getting lost in a workshop. Open it on a laptop, tablet or phone at the machine, search within the PDF for a part number or assembly name, and print the pages you need for the job. Once downloaded, the file is yours to keep and reference on every future repair.

Whether you are a Komatsu owner doing your own maintenance, an independent workshop working on a customer’s PC138US-8 or a parts professional who needs to identify components quickly, this is the reference document that turns a vague description into an exact part number.