Product Description
Premium factory-direct aftermarket 708-1T-00420 Main Hydraulic Piston Pump Assembly, precision-manufactured as a 100% plug-and-play interchangeable drop-in replacement for Komatsu PC40MR-2 and PC45MR-2 mini excavators. Built to handle the rigorous fluid load cycles of high-efficiency utility and rental fleets, this complete double variable pump assembly ensures exact flow synchronization and dynamic speed matching to restore your Komatsu excavator to its peak factory cycle times. Featuring an ultra-rigid nodular iron pump housing, high-density copper-cladding bimetal cylinder blocks, and induction-hardened piston groups , this unit delivers flawless efficiency and eliminates machine tracking drift right out of the crate.
Key Technical Highlights
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100% Absolute OEM Envelope Alignment: Reengineered strictly to identical Komatsu factory dimensions for part number 708-1T-00420. The front mounting pilot flange, splined drive input shaft, high-pressure flange bolt patterns, and rear pilot line ports match the chassis layout with zero installation friction—no modifications required.
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Synchronized Dual-Circuit Test Bench Certified: Micro-diggers heavily rely on precise dual-circuit balance for straight traveling. Every single pump is pre-calibrated on our high-end testing loops, syncing the dynamic tracking curves of both fluid circuits to prevent the excavator from veering sideways under load.
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Premium Bimetallic Wear Optimization: Built with friction-paired bimetal components that heavily resist high-temperature micro-scoring, providing long-term reliability even when running continuous heavy concrete breaking or trenching cycles.
| OEM Part Number | Compatible Komatsu Equipment | Haozheng Assembly Status |
|---|---|---|
| 708-1T-00420 | Komatsu PC40MR-2 Mini Excavator Komatsu PC45MR-2 Mini Excavator |
100% Brand New Complete Pump Assembly. Pre-tested & Load-calibrated to original machinery flow ratings. |
Haozheng Hydraulic Production Processing Diagram
Haozheng Hydraulic Honorary Certificate
Exhibition
FAQ
Q1: My Komatsu PC45MR-2 currently struggles with asymmetrical steering when climbing slopes. Will replacing the pump with your 708-1T-00420 assembly fix this? A: Yes. Asymmetrical steering or tracking drift is a classic symptom of internal wear in one of the twin circuits or unevenly calibrated control valves within the old pump. Because our aftermarket 708-1T-00420 complete pumps are tested under real-load simulations to match synchronized factory pressure tracking, it delivers perfectly balanced volumetric flow to both track motors, restoring straight-line travel.
Q2: Does this pump assembly come complete with the control valve blocks, or do I need to swap my old regulators onto it? A: Our 708-1T-00420 is a fully complete, sealed assembly that includes the built-in controller valve blocks, pre-set and tested. You do not need to risk cross-contamination or setting errors by moving old, worn valves over. Simply bolt the complete new assembly onto your engine flywheel house, connect your hydraulic lines, and start the machine.
