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

This Komatsu shop manual, publication UEBM000901, covers the 1998–2003 PC340-6K, PC340LC-6K, and PC340NLC-6K hydraulic excavators in the K32001 and up and K34001 and up serial number ranges.

Text Search, Bookmarks and Foldout Diagrams

Search and diagram detail: Text search is available in the main text, while many diagram labels are not searchable. Embedded bookmarks reach the main workshop sections and many individual procedures. Small wire codes and pin numbers on the electrical foldout sheets require zooming.

One printable English PDF with 748 pages, including the cover and preliminary material. The total also includes 44 blank or header-only pages and four oversized hydraulic and electrical circuit-diagram sheets.

CLSS Hydraulics, Drive Repair and Machine Diagnostics

Beyond these selected workshop topics, the manual includes air-conditioner component replacement and operator’s cab removal procedures.

• Engine testing: Valve-clearance adjustment, compression and blow-by measurement, fuel-injection timing checks, and engine-related troubleshooting.

• Hydraulic pump: CLSS operation, LS and TVC pressure tests, main-pump disassembly and reassembly, and component contact checks.

• Travel and final drives: Travel-motor teardown and assembly, final-drive repair, floating-seal installation, and bearing adjustment.

• Pilot controls and cylinders: PPC-valve service, center-swivel-joint disassembly and assembly, hydraulic-cylinder repair, and circuit air bleeding.

• Electrical troubleshooting: Governor and pump-controller fault charts, service-code tables, machine-monitor diagnosis, connector references, and electrical circuit diagrams.

• Undercarriage inspection: Track-shoe tension adjustment, sprocket-wear measurement, swing-circle bearing checks, and component inspection limits.

Written for service-workshop personnel, this manual includes procedures requiring hydraulic test equipment, electrical meters, special tools, and suitable lifting equipment.

Engine Service and Cooling-System Work

Step-by-step instructions cover cylinder-head removal and installation, engine and main-pump removal, and replacement of the injection pump, turbocharger, water pump, thermostat, and engine seals.

Engine coverage: The SAA6D108E-2 is water-cooled and uses an air-cooled aftercooler. The manual directs detailed engine work to the separate Engine Shop Manual; this PDF should not be selected as a complete internal-engine overhaul reference.

Hydraulic Testing and Component Repair

The structural explanations and factory test specifications provide a reference for maintenance and shop-floor diagnostics. Hydraulic-drift and cylinder-leakage tests help distinguish defective cylinder packing from control-valve faults.

Main-pump procedures include checks of the cylinder-block/valve-plate and rocker-cam/cradle contact surfaces. The air-bleeding chart distinguishes work on the pump, cylinders, swing motor, and travel motor according to the components disturbed.

Control-valve coverage: Structure, function, testing, and maintenance standards are included. The main control-valve removal and teardown sequence listed in the contents is absent from this PDF.

Final Drives, Swing Machinery and Track Components

Final-drive assembly notes distinguish the ring-gear/hub joint, where gasket sealant is prohibited, from surfaces that receive sealant. Center-swivel reassembly cautions identify the slipper seals and O-rings as vulnerable to damage during rotor installation.

Swing and undercarriage coverage: Structural information and inspection standards cover the swing machinery, swing circle, track frame, recoil spring, idlers, and rollers. Several removal and overhaul procedures listed for these assemblies in the contents are absent from the supplied PDF.

Circuit Tracing and Workshop References

Connector pin-number tables complement the Actual Electric Wiring Diagram and Electric Circuit Diagram for circuit tracing. The Hydraulic Circuit Diagram, Hydraulic Piping Drawing, and Specification Drawings show circuit routing and machine layout.

Troubleshooting charts separate engine symptoms, governor control, pump control, input signals, hydraulic/mechanical faults, and machine-monitor problems. Standard bolt-and-nut torque tables are supplemented by component-specific assembly specifications.

Tool references include the 799-101-5002 hydraulic tester and 790-331-1110 wrench, with additional special-tool lists and dimensioned tool sketches.

Examples of Fluid Capacities and Tank-Valve Data

The fuel-and-lubricant table lists 28.4 liters for the engine oil pan. For each final-drive case, that table distinguishes a 10-liter specified capacity from a 9.5-liter routine refill, rather than treating both quantities as interchangeable.

For the K34001 and up hydraulic-tank arrangement, the safety-valve data specify a relief cracking pressure of 16.7 ± 6.9 kPa.

Because this equipment combines high-pressure hydraulics and heavy assemblies, follow the manual’s pressure-release and lifting precautions before attempting service.