Komatsu 708-3T-00240 hydraulic pump for PC78MR-6 PC78UU-6 excavator
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This pump assembly is a direct "bolt-on" replacement for the following Komatsu factory part numbers. While the suffixes changed over production years to reflect minor internal upgrades, they are largely interchangeable for these specific machine models:
Primary OEM Part Numbers: 708-3T-00240, 708-3T-00241
Alternative/Interchange Numbers: 708-3T-00120, 708-3T-00220, 708-3T-00215, 708-3T-00216, 708-3T-00217
Machine Fitment: * PC78MR-6 (Minimum Radius)
PC78UU-6 (Ultra-Urban)
PC78US-6 (Ultra-Short)
2. Technical Specifications
Pump Type: Variable Displacement Axial Piston Main Pump.
Control Valve Type: Integrated LS (Load Sensing) and PC (Pressure Compensation) valves.
Maximum Pressure: Rated for continuous high-pressure operation up to 285 bar (28.5 MPa).
Flow Characteristics: Designed to provide precise flow sharing, ensuring that lifting the boom does not stall the travel motors or swing function.
Housing: Compact, heavy-duty cast iron construction designed to fit the narrow engine compartments of short-tail swing excavators.
3. Why Partner With a 13-Year Industry Expert?
Factory-Spec Calibration: We understand the nuances of the PC78 hydraulic curve. Our pumps come with the regulators pre-set to factory specifications, meaning your machine will track straight and maintain original cycle times immediately after installation.
100% Bench Validation: Every unit is subjected to a comprehensive performance test. We monitor volumetric efficiency, response time of the LS valves, and internal case drain leakage under maximum load.
Material Integrity: We utilize premium internal components (cylinder blocks, piston shoes, and valve plates) that meet or exceed OEM hardness requirements for long-term wear resistance.
Express Logistics: Units are secured in shock-proof, export-grade wooden crates and shipped via DHL, FedEx, or UPS, typically arriving within 3 to 7 business days.
4. Critical Installation & Maintenance Protocol
Case Priming (Mandatory): You must fill the pump housing with clean hydraulic oil through the highest case drain port before starting the engine. Running a piston pump "dry" will cause catastrophic failure of the internal friction surfaces within seconds.
System Flush: If your previous pump failed due to internal "grenading" (metal fragments), you must flush the hydraulic tank, lines, and oil cooler. Metal debris is the #1 cause of premature failure in new pumps.
Oil & Filter Service: Always use fresh ISO VG46 hydraulic oil and install a new high-efficiency suction strainer and return filter during the pump swap.
Air Bleeding: After installation, run the engine at low idle and cycle all cylinders (boom, arm, bucket) several times to their full stroke to purge any trapped air from the hydraulic circuit.
5. Ordering Information
To ensure 100% accuracy for your specific unit, please provide:
The Machine Serial Number (found on the chassis plate).
A photo of the Data Plate on your current pump (if still legible).