Kobelco SK30SR-2 & SK35SR-2 Hydraulic Excavator Service Manual OEM

This 644-page official Kobelco publication serves as the authoritative reference for the 2001–2011 SK30SR-2 and SK35SR-2 mini excavators. It details both canopy and cab configurations across US, EU, and Oceania market variants. Designated under book codes S5PW0002E through S5PW1302E (second revision, December 2002), the documentation captures the critical transition between early and late serial number machine specifications. Inside this searchable PDF, technicians will find 74 dimensioned component diagrams, 12 hydraulic system operating circuit charts, and 45 technical maintenance standard tables.

• Step-by-step repair and whole disassembling instructions cover the upper slewing structure, swivel joint, travel system, attachments, and main control valve.
• Comprehensive troubleshooting chapters feature wiring diagrams, hydraulic circuit schematics, boom dimensional drawings, lifting capacity charts, swing bracket dimensional drawings, and engine performance curves.

Technical Coverage and System Data

The manual breaks down technical performance standards, operational parameters, and maintenance procedures for this specific excavator series. Detailed chapters map out machine specifications, including precise engine data for the Yanmar 3TNE82A series and hydraulic circuit functionality. It also lays out standardized testing procedures for travel and slewing performance. You get a direct breakdown of system pressures, clearances, and tolerances for the boom, arm, bucket, dozer, and swing mechanisms. This provides a solid baseline for qualified mechanics handling component overhauls. Instead of outsourcing to an expensive heavy-equipment dealership, shop professionals can follow the step-by-step instructions for complex jobs, such as rebuilding the travel reduction unit, completely tearing down the upper slewing structure, or overhauling the slewing motor. Heavy equipment maintenance carries inherent physical risks. Technicians should always verify pressure release protocols and stabilize hydraulic components before initiating any teardown procedures to ensure shop safety.

Engineering Specifications and Testing Values

Specification data within these pages gives a deep look into the operational requirements of the SK30SR-2 and SK35SR-2. Main circuit pressure is firmly documented at 230 kgf/cm2 (3270 psi) to maintain optimal boom, bucket, and travel performance. The documentation covers comprehensive torque tables for capscrews and nuts ranging from M6 to M36, cleanly formatted for both lubrication and non-lubrication scenarios. Fluid capacities are explicitly stated. You will find the coolant system holds 2.5 liters, while the engine oil capacity requires 3.9 liters total. Slew bearing play is categorized by strict clearance limits of 1.4 ± 0.4 mm. Maintaining these exact tolerances is vital to preserve structural integrity during rotation under heavy loads.

A frequent pitfall when servicing the SK30SR-2 and SK35SR-2 involves neglecting the strict air bleeding sequences after a hydraulic pump, travel motor, or slewing motor replacement. Failing to properly bleed these components before restoring operation leaves trapped air in the lines, frequently leading to rapid dry-start cavitation and severe internal damage to the axial piston motors upon startup. Utilizing the integrated standard maintenance time tables directly benefits independent shops by enabling service writers to accurately estimate labor hours, eliminating billing guesswork and keeping in-house workflows highly profitable.