Komatsu PC300-6 PC350-6 Series Excavator Complete Shop Manual

Description

Komatsu PC300-6 & PC350-6 Series Excavator Shop Manual

This is the complete shop manual for the Komatsu PC300-6, PC300LC-6, PC350-6 and PC350LC-6 hydraulic excavators. It is the same reference material used in a service workshop to understand, test, disassemble, repair and reassemble these machines. The manual covers the SAA6D108-2 engine and all major hydraulic, powertrain, electrical and undercarriage systems in extensive technical detail.

File Details

• Manual Type: Shop Manual (Service Manual)
• Brand: Komatsu
• Models Covered: PC300-6, PC300LC-6, PC350-6, PC350LC-6
• Engine: SAA6D108-2
• Language: English
• Format: PDF
• Page Count: Approximately 500 pages

Chapters Covered

The Komatsu PC300-6 PC350-6 Series shop manual is divided into six main chapters, each targeting a different stage of repair and maintenance work. Chapters are further split into component groups.

• 01 GENERAL — Specification drawings, specifications, weight table, fuel/coolant/lubricants
• 10 STRUCTURE AND FUNCTION — Parts related to engine, radiator and oil cooler, power train, final drive, swing circle, swing machinery, track frame and recoil spring, track shoe, hydraulic piping and circuit drawings, hydraulic tank and filter, hydraulic pump, control valve, CLSS, swing motor, center swivel joint, travel motor, valve controls, PPC valves and safety lock, EPC solenoid valve, boom holding valve, hydraulic cylinders, work equipment, wiring diagrams, engine control, electronic control system, machine monitor system
• 20 TESTING AND ADJUSTING — Pre-repair and post-repair checks, adjustments, troubleshooting charts correlating problems to causes
• 30 DISASSEMBLY AND ASSEMBLY — Removal, installation, disassembly and assembly order for each component with precautions
• 40 MAINTENANCE STANDARD — Judgement standards when inspecting disassembled parts
• 90 OTHERS — Additional reference material and supplementary information

What This Shop Manual Gives You

This Komatsu PC300-6 PC350-6 Series excavator shop manual goes far beyond routine maintenance. It is a full workshop-level reference covering the complete machine. The Structure and Function chapter explains how each component works and serves as reference material for troubleshooting. The Testing and Adjusting chapter covers the checks to be made before and after repairs and the adjustments to be made when checks and repairs are complete, along with troubleshooting charts that correlate problems to causes. The Disassembly and Assembly chapter gives the order to follow when removing, installing, disassembling or assembling each component and the precautions to take. The Maintenance Standard chapter provides the judgement standards used when inspecting disassembled parts.

Because it covers both the PC300 and PC350 models in standard and LC (long crawler) configurations, this manual is a compact reference for the two excavator families that share the SAA6D108-2 engine and the same core hydraulic and control architecture.

Covered Models & Serial Numbers

• PC300-6 — Serial number 30001 and up
• PC300LC-6 — Serial number 30001 and up
• PC350-6 — Serial number 10001 and up
• PC350LC-6 — Serial number 10001 and up

Engineered for Serious Repair Work

The hydraulic system alone is documented in exceptional depth. The CLSS (Closed center Load Sensing System) is explained step by step, including the LS valve, TVC valve, pressure compensation valve, unload valve, LS bypass valve, merge/flow divider valve, LS select valve, boom and arm regeneration circuits, and the 2-stage safety valve on the boom cylinder head. Hydraulic pump breakdown covers the HPV125 + 125 main pump, the control pump, and the TVC/LS control architecture. The swing motor, travel motor, center swivel joint, and hydraulic cylinders are all covered with cross-sectional illustrations and specifications.

On the engine side, the manual references the SAA6D108-2 engine and the 108-2 Series Engine Shop Manual for engine details, while providing full coverage of the engine control system, electronic control system, governor and pump controller, fuel control dial, governor motor, auto deceleration system, automatic warming-up and overheat prevention, swing priority, and travel control systems.

Who This Manual Is For

This Komatsu PC300-6 PC350-6 Series shop manual is written for the service technician working in a workshop environment. It assumes access to the machine, standard tooling, and a hoist for heavy components. Owners who perform their own repairs, fleet maintenance managers, and independent repair shops working on these excavators will find the testing and adjusting procedures and the maintenance standards directly usable. The manual is also a strong reference for understanding how the machine’s hydraulic and electronic control systems interact before diagnosing faults.

Specifications at a Glance

Both models share a 7,145 cc (7.145 L) displacement, 6-cylinder SAA6D108-2 engine rated at 172.8 kW (231.7 HP) at 2,050 rpm, with maximum torque of 897 Nm (91.5 kgm) at 1,500 rpm. The PC300-6 has an operating weight of 30,800 kg, while the PC350-6 comes in at 32,300 kg. Maximum digging depth for both models is 7,380 mm, maximum digging reach is 11,100 mm (PC300-6) / 11,080 mm (PC350-6), and travel speeds range from 3.7 to 5.5 km/h. The hydraulic system runs two variable displacement piston pumps at 251 L/min each plus a 42 L/min gear pump, with a set pressure of 34.8 MPa (355 kg/cm²).

Get the Complete Shop Manual for Your Komatsu Excavator

Whether you are rebuilding a final drive, diagnosing a hydraulic drift issue, adjusting the LS valve, or setting the correct tightening torque on a split flange bolt, this Komatsu PC300-6 PC350-6 Series shop manual gives you the procedures, specifications, illustrations and judgement standards needed to do the job correctly. Using the correct procedures and specifications matters: it prevents damage to precision hydraulic components, avoids repeat failures, and keeps the machine operating within the parameters the factory intended.

IMAGES PREVIEW

This is a digital PDF download. There is no shipping, no waiting, and no physical book to lose. After payment you can download the file instantly and access it on any device — laptop, tablet or phone — and print the pages you need for the workshop. The PDF is fully indexed by chapter and page number so you can navigate directly to the section you need.