Komatsu BR380JG-1 Mobile Jaw Crusher Shop Manual – SEBM034104

Description

Komatsu BR380JG-1 Mobile Jaw Crusher Shop Manual

The Komatsu BR380JG-1 Shop Manual — document number SEBM034104 — is the complete service and repair reference for the BR380JG-1 mobile jaw crusher, covering machines from serial number 1001 and up. This manual is designed for service technicians working in a workshop environment, providing the structure, function, maintenance standards, testing procedures, adjustment values, disassembly and assembly instructions, and troubleshooting guidance needed to keep this machine operating correctly.

The BR380JG-1 mounts the SAA6D102E-2 engine. For engine-specific details, the manual directs readers to the 102 Series Engine Shop Manual — the engine itself is treated as a separate volume. Everything else on the machine, from the crusher and grizzly feeder through the hydraulic system, travel gear, conveyors, and electrical control system, is covered in this manual.

File Details

• Manual type: Shop Manual (Service & Repair)
• Brand: Komatsu
• Model: BR380JG-1
• Serial number range: 1001 and up
• Document number: SEBM034104
• Language: English
• File format: PDF
• Revision date: 2023–2024

Chapters Covered

The manual is divided into five major sections, each building on the last to give a full picture of the machine:

• 01 GENERAL — Specification drawings, specifications, weight table, fuel/coolant/lubricants, standard tightening torques, conversion tables, and units.
• 10 STRUCTURE, FUNCTION AND MAINTENANCE STANDARD — Damper assembly, radiator and oil cooler, drive system for components, final drive, undercarriage, track frame and idler, hydraulic tank, hydraulic pump (LS/PC/EPC valves), control valve, CLSS system, crusher motor, feeder motor, conveyor motor, travel motor, travel junction valve, PPC valve, solenoid valves, EPC valves, grizzly feeder system, abnormal load stop system, primary belt conveyor, grizzly feeder, jaw crusher, crusher tooth tip adjustment system, revolution angle sensor, engine control system, engine throttle and pump controller, electronic control system, monitor panel, sensors, and more.
• 20 TESTING AND ADJUSTING — Standard value tables for engine and chassis, testing and adjusting procedures, troubleshooting, testing tools, engine RPM inspection and adjustment, exhaust gas color measurement, valve clearance adjustment, compression pressure measurement, blow-by pressure measurement, fuel injection timing, engine oil pressure, engine speed sensor adjustment, diode inspection, emergency escape procedures, oil pressure testing in work equipment and travel circuits, control circuit oil pressure, pump PC and LS control circuit oil pressure, solenoid valve output pressure, PPC valve output pressure, oil leakage measurement, air bleeding, travel deviation testing, track shoe tension, special functions of the monitor panel, jaw crusher testing and adjusting, crusher drive belt tension, primary belt conveyor, magnetic separator, radio controller companies, and electrical system troubleshooting preparation.
• 20 TROUBLESHOOTING (continued) — Points to remember, sequence of events, maintenance points, checks before troubleshooting, classification and steps, connector types and locations, connection tables, T-branch boxes, troubleshooting by error code (electrical and mechanical systems), E-mode troubleshooting, H-mode troubleshooting, S-mode engine troubleshooting.
• 30 DISASSEMBLY AND ASSEMBLY — Method of using the manual, precautions, crusher disassembly and assembly, lock cylinder, primary conveyor assembly, belt replacement, primary belt conveyor motor, primary belt conveyor head pulley frame, folding engine front cover.
• 90 OTHERS — Hydraulic circuit diagrams (2 parts) and electrical circuit diagrams (3 parts).

This is a genuinely comprehensive workshop document. It doesn’t just list specifications — it explains how each system works, what the maintenance standards are, how to test and adjust components, how to interpret error codes, and how to disassemble and reassemble major assemblies. The troubleshooting sections alone span hundreds of pages of diagnostic procedures for both electrical and hydraulic/mechanical systems.

What This Manual Covers In Practice

The Komatsu BR380JG-1 shop manual is aimed at service technicians and workshops that maintain and repair this mobile jaw crusher. The machine is a track-mounted crushing plant with a jaw crusher, grizzly feeder, primary belt conveyor, and — depending on configuration — side conveyor and magnetic separator. The manual addresses all of these systems.

In the structure and function section, you’ll find detailed explanations of how the hydraulic pump controls work — the LS valve, PC valve, and EPC valves, and how the CLSS (Closed center Load Sensing System) regulates pump discharge. The control valve section covers the merge-divider valve, pressure compensation valves, unload valve, relief valve, and the various spool functions for travel, crusher, feeder, conveyor, and accessory circuits. The travel motor section explains the counterbalance valve, parking brake, and safety valve operation. The crusher motor section covers the relief valve, check valves, and shuttle valves that protect the motor during stopping.

The testing and adjusting section is where the manual becomes a working tool. It includes standard value tables for engine speeds, compression pressure, oil pressure, belt tension, and more. There are procedures for adjusting valve clearance, fuel injection timing, engine speed sensor, and governor settings through the monitor panel. The hydraulic testing section walks through measuring unload pressure, main relief pressure, travel relief pressure, PC valve output pressure, LS valve output pressure, LS differential pressure, solenoid valve output pressure, and PPC valve output pressure — with standard values and adjustment procedures for each.

The monitor panel special functions section is particularly detailed. It covers the service menu, password function, monitoring items, abnormality records, maintenance records, phone number entry, unit/language settings, adjustment functions (governor motor, pump absorption torque, low idle speed, feeder speed, crusher speed, clearance potentiometer initialization), crusher clearance history, and lock cylinder slip history. This is the electronic heart of the machine, and the manual treats it thoroughly.

The jaw crusher section covers the crusher’s working principle, discharge setting adjustment (automatic, semiautomatic, and manual modes), wear limits for jaw plates, cheek plates, protectors, wedges, toggle seats, and toggle plates, and the procedure for turning or replacing jaw plates. The grizzly feeder section explains the semiautomatic system that reduces feeder speed when crusher load is high, and the abnormal load stop system that stops work equipment when pressures exceed set values.

The troubleshooting chapter is extensive. It includes error code tables for the electrical system (E-codes) and failure codes for the mechanical system, with detailed step-by-step diagnostic procedures for each code. The E-mode troubleshooting covers symptoms like engine not starting, engine stopping, unstable rotation, monitor panel issues, and work equipment problems. The H-mode troubleshooting covers hydraulic and mechanical issues like low speed/power, engine stall, travel deviation, crusher not operating, and more. The S-mode troubleshooting covers engine-specific issues like poor starting, black exhaust smoke, oil consumption, and abnormal noise.

The disassembly and assembly section provides procedures for the crusher (cheek plates, fixed and swing jaw plates, toggle plates, toggle seats), lock cylinder, primary conveyor assembly, belt replacement, primary belt conveyor motor, and head pulley frame. It includes weight tables for components, torque specifications, and special tool references.

Finally, the others section contains hydraulic circuit diagrams and electrical circuit diagrams — essential for tracing circuits during diagnostics.

Why This Manual Matters

The BR380JG-1 is a complex machine. It combines a diesel engine, a hydraulic system with multiple pumps and valves, an electronic control system with a monitor panel and controller, a jaw crusher, a grizzly feeder, and belt conveyors. Without the correct procedures and specifications, repairs can be slow, parts can be damaged, and safety can be compromised.

The manual provides the maintenance standards — the clearances, torques, pressures, and wear limits that tell you when a part is still serviceable and when it needs replacement. It provides the testing and adjusting procedures that let you diagnose problems accurately rather than guessing. It provides the troubleshooting flowcharts that walk you through a logical diagnostic process. And it provides the disassembly and assembly instructions that let you take components apart and put them back together correctly.

For a workshop that services Komatsu crushers, this manual is the reference that turns a complex machine into a manageable repair job.

Delivery

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