1995–1998 Hyundai Robex 130LC-3 & 130LCM-3 Excavator Service Manual

Get the specs right. This Hyundai service manual covers the 1995–1998 Robex 130LC-3 and 130LCM-3 crawler excavators, with hydraulic and electrical troubleshooting, maintenance standards, and component disassembly and assembly procedures.

• Hydraulic System Schematics: Main, pilot, drain, and return circuits; single and combined operations; pump-regulator flow control; and main control valve functions.

• Mechatronics & Electrical: CAPO (Computer Aided Power Optimization), engine control integration, monitoring circuits, connector identification, and symptom-based electrical troubleshooting charts.

• Hydraulic Component Repair: Main pump and regulator disassembly, main control valve service, swing and travel device overhaul, turning joint repair, and RCV lever assembly.

• Cylinders & Undercarriage: Boom, arm, and bucket cylinder overhaul; track-link and roller replacement; front idler and recoil spring disassembly and assembly.

• Testing & Inspection: Operational performance tests, hydraulic pressure checks, component wear limits, work-equipment pin and bushing inspection, and tightening-torque tables.

Written for service workshop personnel, this manual suits mechanics equipped for hydraulic testing, electrical measurements, and heavy component handling.

Hydraulic Diagnosis and Component Repair

Pump coverage explains negative-flow, total-horsepower, and power-shift control, supported by regulator flow-characteristic charts. Main control valve circuit diagrams and internal cross-sections show load holding, arm regeneration, and straight-travel operation.

Gear-pump construction is documented within the pump device section; RCV pedal coverage includes structure, operation, and inspection standards.

Swing and travel chapters cover motor internals, reduction gears, and parking brakes. The specifications distinguish swing devices through serial #1904 and from #1905, and travel devices through #1563 and from #1564. These distinctions matter when matching component specifications to the machine.

The pressure tables cover the main control valve's normal and power-boost relief settings and travel motor operating pressures.

Regulator service notes generally recommend assembly replacement. The main relief valve is normally removed and installed as a complete cartridge.

Electrical Fault Isolation and CAPO Checks

Component-location drawings and connector pin layouts accompany the Starting Circuit, Charging Circuit, and Controller Circuit diagrams. CAPO troubleshooting separates governor-motor, engine-speed-sensor, controller, and EPPR valve checks, with resistance, current, and pressure measurements tied to specific symptoms. The Prolix Switch section explains normal and emergency control operation.

For an EPPR-related fault, the resistance test provides a measurable check of the valve coil before assuming a replacement is needed. Operational performance charts separately distinguish standard performance from allowable limits.

The Cummins 4BTA3.9 appears in engine specifications and machine-control checks. Engine troubleshooting is referred to separate Cummins documentation; this excavator manual does not provide an internal engine overhaul chapter.

Cylinder, Track and Work-Equipment Service

Cylinder section views support piston, rod, and seal assembly work. The cylinder instructions identify reversed rod seals as a cause of seal-lip damage. RCV lever cleaning notes also warn that contaminated cleaning fluid can damage precision parts and impair valve operation.

Track and carrier roller coverage addresses removal and installation, with wear standards provided separately. Front idler and recoil spring sections go further into disassembly and assembly. Boom, arm, and bucket removal and installation are covered; bucket clearance adjustment is referred to the operation manual.

Working on heavy hydraulic systems carries inherent risks. Consult the opening safety section before pressure testing or travel-motor service, and observe the lifting and spring-load precautions in the repair chapters.

Selected Swing-Motor, EPPR and Engine Specifications

These examples are a small selection of the manual's component specifications and diagnostic values.

Swing motor relief pressure is 220 kgf/cm² through serial #1904 and 240 kgf/cm² from #1905 onward. Corresponding brake release pressure ranges are 17–40 kgf/cm² and 22–40 kgf/cm², respectively.

For EPPR fault testing, valve resistance is specified as 24 ± 1 Ω at 20°C. The Cummins engine specification table lists an oil quantity of 11 liters.

PDF Navigation, Diagram Detail and Page Count

Search and diagram readability: The English PDF is partially searchable; text search does not extend to numerous circuit diagrams and repair pages. Embedded bookmarks open the foreword and all eight main sections. Small wiring labels require magnification, and some hydraulic schematic lines and labels are faint.

One printable PDF contains 476 pages total: 473 manual pages, one cover page, one linked contents page, and one additional front-matter page, all included. The Prolix Switch page, numbered 5-12, appears at the end of the file.