Komatsu PC340-6K, PC340LC-6K, PC340NLC-6K Excavator 1998–2003 Shop Manual (P/N UEBM000901)

• Official 748-page Komatsu shop manual (publication number UEBM000901) for the 1998–2003 PC340-6K, PC340LC-6K, and PC340NLC-6K hydraulic excavators
• Covers models within the K32001 and K34001 and up serial number ranges
• Features comprehensive hydraulic system diagrams, structural specifications, and torque reference tables directly applicable to shop-floor diagnostics
• Details mechanical assembly, testing, and adjustment parameters for major excavator components
• Explores the SAA6D108E-2 engine, travel motors, swing motors, center swivel joint, and PPC valves
• Contains actual electric wiring diagrams, hydraulic circuit diagrams, hydraulic piping drawings, specification drawings, and troubleshooting charts

Documenting the 1998–2003 Komatsu PC340-6K Series

When servicing heavy-duty hydraulic machines, having exact factory data is critical. This 1998–2003 Komatsu PC340-6K series shop manual PDF delivers the technical reference material required to maintain and troubleshoot these excavators effectively. It maps out the structural functions of engine-related systems, power train components, and complex hydraulic circuits. For instance, you will find specific breakdowns of the CLSS (Closed-center Load Sensing System) to help diagnose efficiency issues. To save expensive trips to the dealer workshop, this reference provides step-by-step instructions for complex in-house procedures, such as adjusting valve clearances, testing fuel injection timing, bleeding air from the hydraulic circuit, and measuring track shoe tension. Additional sections outline the disassembly and assembly parameters of the swing machinery, final drives, and track frame assemblies, providing mechanics with an authoritative reference for heavy maintenance work.

Specification Highlights

Precision matters during system calibration and component servicing. This technical document catalogs exact capacities and settings to ensure accurate rebuilds, allowing technicians to verify acceptable wear limits and avoid time-consuming trial and error during major overhauls. The engine oil pan capacity is rated at 28.4 liters, while the final drive case holds exactly 10 liters. You will also find critical pressure settings, such as the hydraulic tank relief cracking pressure specified at 16.7 ± 6.9 kPa, alongside cooling capacities for air-cooled configurations. Standardized charts list all required tightening torques for bolts and nuts to guarantee assembly precision.

A common diagnostic pitfall when overhauling the final drives on these models is mistakenly applying gasket sealant to the mating surface of the ring gear and hub, which can lead to severe mechanical failure. Additionally, failing to properly bleed the air from the swing and travel motor cases after a fluid drain routinely causes immediate cavitation and internal scoring. Because heavy machinery repair involves high-pressure hydraulics and massive structural components, always ensure work is guided by a certified technician following industry safety standards before attempting any service on this equipment.