Kobelco SK125SR SK135SR-2 SK135SRLC-2 Excavator Shop Manual – Complete PDF Repair Guide

Description

Kobelco SK125SR SK135SR-2 SK135SRLC-2 Shop Manual

This is the complete Kobelco SK125SR, SK135SR-2 and SK135SRLC-2 Shop Manual covering the full range of service, repair and maintenance procedures for these compact excavators. Whether you are a professional technician, a fleet maintenance manager or an owner-operator, this manual provides the technical detail needed to keep the machine running correctly.

File Details

• Manual type: Shop Manual (Service & Repair)
• Brand: Kobelco
• Models covered: SK125SR, SK135SR-2, SK135SRLC-2
• Engine: Mitsubishi D04FR-74kW
• Document number: S5YY0013E01
• Edition: First Edition, December 2007
• Language: English
• Page count: 792 pages
• File format: PDF

Chapters Covered

• Specifications
• Maintenance
• System
• Disassembly
• Troubleshooting
• Engine
• Procedure of Installing Options
• Outline — General precautions for making repairs, safety when disassembling and assembling, hydraulic equipment, electrical equipment, weld repair, environmental issues, SI units
• Specifications — Component names, general dimensions, weight of components, transportation, speed and climbing capability, engine specifications, hydraulic components, type of crawler, type of bucket, combinations of attachment
• Attachment Dimensions — Boom, arm, bucket dimensional drawings and maintenance standards, lug section and boss section
• Tools — Tightening torques for capscrews and nuts, screw sizes, tightening torque for hose and fitting, tightening torques for nuts and sleeves, plugs, special spanner for tube, special tools, suction stopper, counterweight lifting jig, boom mounting pin tool, upper frame lifting jig, engine mounting pedestal, track spring set jig
• Standard Maintenance Time Table — Standard working time table for maintenance of excavator, engine maintenance service standard time list
• Maintenance Standard and Test Procedure — Performance inspection standard table, measurement of engine speed, hydraulic pressure, travel and swing performances, attachment operating performances, swing bearing, mechatro controller
• Mechatro Control System — Summary, unload valve control, positive control and P-Q control, boom up conflux control, arm in recirculation and conflux control, arm-in anti-cavitation control, arm-out conflux control, bucket digging control, swing priority control, travel straight control, pressure release control, N&B switch control, option conflux control, mechatro controller, self diagnosis display, service diagnosis, trouble history, troubleshooting mode
• Hydraulic System — Summary, hydraulic circuits and components, neutral circuit, travel circuit, bucket circuit, boom circuit, swing circuit, arm circuit, combined circuit, pressure draining circuit
• Electric System — Electric circuit diagram, electrical equipment list, harness, instrument panel, controller install, upper harness, engine harness, cab harness, boom harness, travel alarm
• Components System — Hydraulic pump and regulator, control valve, pilot valve (attachment and travel), swing motor unit, travel motor, swivel joint, cylinder, electric equipment
• Air-Conditioner System — Basic system, component and construction, piping, function, disassembly and assembly, charging refrigerant, electric circuit, troubleshooting, self diagnosis
• Disassembling and Assembling — Attachment, upper structure, travel system
• Attachment — Removing and installing, disassembling and assembling cylinder
• Upper Structure — Removing and installing operator seat, cab, battery, guard, under cover, fuel tank, hydraulic tank, hydraulic pump, air cleaner, muffler, counterweight, radiator and oil cooler, engine, console cover, multi control valve, control valve, pilot valve, swing motor unit, swivel joint, upper frame; disassembling and assembling hydraulic pump, control valve, pilot valve, swing motor unit, swivel joint
• Travel System — Removing and installing crawler, upper roller, lower roller, front idler, sprocket, travel motor, swing bearing; removal and installation of travel motor unit
• Troubleshooting (By Error Codes) — Classification of failure, blown fuse of mechatro controller, troubleshooting by error code
• Troubleshooting (By Trouble) — Hydraulic system, electric systems, engine related troubleshooting
• Troubleshooting (Trouble Diagnosis Mode) — Trouble diagnosis mode 1 and 2, diagnosis items, diagnosis and remedy
• Engine — Mitsubishi D04FR-74kW service manual content

What This Manual Covers

The Kobelco SK125SR SK135SR-2 SK135SRLC-2 shop manual is a comprehensive service publication that spans seven major chapters and numerous sub-sections, giving you access to the same technical information used by professional service technicians. It begins with complete specifications for the machine and its components, including general dimensions, component weights, engine data, hydraulic component details, crawler and bucket types, and attachment combination charts.

The maintenance section provides standard working time tables for all major service operations, along with engine maintenance service intervals. The maintenance standard and test procedure chapter gives you the exact performance inspection standards, measurement procedures for engine speed, hydraulic pressure, travel and swing performance, cylinder operating times, and swing bearing assessment — everything needed to verify the machine is operating within factory tolerances.

The system chapters are where this Kobelco SK125SR SK135SR-2 SK135SRLC-2 repair manual really delivers. The mechatro control system section explains the electro-hydraulic control architecture in detail: unload valve control, positive control and P-Q control, boom up conflux, arm in recirculation and conflux, anti-cavitation control, swing priority, travel straight control, pressure release mode, and option conflux. It also covers the mechatro controller’s self-diagnosis display, service diagnosis functions, trouble history, and the built-in trouble diagnosis mode that automatically identifies failed sections.

The hydraulic system chapter includes complete circuit diagrams and operating explanations for the neutral circuit, travel circuit, bucket circuit, boom circuit, swing circuit, arm circuit, combined circuits, and the pressure draining (release) circuit. The electric system chapter provides the full electric circuit diagram, electrical equipment list, and harness layouts for the upper frame, engine, cab, boom and travel alarm. The components system chapter documents the hydraulic pump and regulator, control valve, pilot valves, swing motor, travel motor, swivel joint, cylinders, and electric equipment.

Disassembly, Troubleshooting and Engine

The disassembly and assembly chapters are extensive. The attachment section covers removing and installing the bucket, arm and boom, plus complete cylinder disassembly and assembly with maintenance standards, inspection procedures, tightening torques and tooling lists. The upper structure section covers removal and installation of every major component — cab, fuel tank, hydraulic tank, hydraulic pump, air cleaner, muffler, counterweight, radiator, engine, control valve, pilot valves, swing motor, swivel joint and upper frame — with detailed disassembly and assembly procedures for the hydraulic pump, control valve, pilot valves, swing motor unit and swivel joint. The travel system section covers the crawler, upper and lower rollers, front idler, sprocket, travel motor, swing bearing, and full travel motor unit disassembly and assembly.

IMAGES PREVIEW

Troubleshooting is addressed through three dedicated chapters. The error code troubleshooting chapter classifies failures, explains what happens when mechatro controller fuses blow, and provides a full error code table with troubleshooting steps. The by-trouble troubleshooting chapter walks through hydraulic system symptoms (slow operation, engine stall, poor fine control, boom/arm/bucket/swing/travel problems, drift, deviation, speed change issues) and electrical system problems with service diagnosis checking procedures. The trouble diagnosis mode chapter describes the two automatic diagnosis modes that identify failed sections without manual intervention.

The engine chapter contains the Mitsubishi D04FR-74kW service manual content, covering the engine used across all three models. This Kobelco SK125SR SK135SR-2 SK135SRLC-2 PDF manual also includes the procedure for installing options, with hydraulic circuit additions for nibbler and breaker specifications.

Why This Manual Matters

Having the Kobelco SK125SR SK135SR-2 SK135SRLC-2 shop manual PDF means you can perform repairs and maintenance with the correct procedures, torque specifications, clearance limits and diagnostic steps. The manual provides the exact sequence for disassembling and reassembling hydraulic components, the correct tightening torques for capscrews and fittings, the service limits for wear parts, and the troubleshooting logic to trace faults systematically rather than by guesswork.

For hydraulic and electrical diagnostics, the manual includes complete circuit diagrams for both systems, pressure measurement procedures, relief valve adjustment steps, and the mechatro controller’s self-diagnosis and service diagnosis functions. The trouble diagnosis mode alone can save hours of diagnostic time by automatically identifying whether the fault is in the unload system, pump system, travel straight system, engine system or pilot system.

This manual is delivered as an instant PDF download after purchase. No shipping, no waiting — you get immediate access to all 792 pages on any device. Print the pages you need for the workshop, or keep the full manual on a laptop or tablet for quick reference during repairs. The PDF format allows you to search for specific topics, torque values or error codes, making it practical for both planned service work and emergency troubleshooting.