Product Description
Premium factory-direct aftermarket 708-1T-00290 Main Hydraulic Piston Pump Assembly, precision-engineered as a 100% plug-and-play interchangeable alternative for Komatsu PC50MR-2 and PC55MR-2 mini excavators. Built to handle the rigorous, continuous variable load cycles of compact construction machinery, this complete main pump assembly ensures identical hydraulic flow and speed synchronization to match original Komatsu factory performance. Featuring a reinforced cast-iron outer frame, micro-lapped high-density bimetal cylinder blocks, and induction-hardened piston-shoe groups , this pump eliminates systemic tracking drift and restores your excavator’s standard cycle times right out of the box.
Key Technical Highlights
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100% Match OEM Envelope Geometry: Specially formulated to replicate the exact dimensions of Komatsu part code 708-1T-00290. Splined drive input shaft, dynamic front pilot flange, and all high-pressure split-flange ports or pilot control line threads line up flawlessly with your excavator’s chassis layout—zero field modification required.
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Pre-Calibrated Flow & Pressure Controllers: Excavator main pumps rely on intricate load-sensing and pressure-limiting controls. Every single unit we build is pre-calibrated on our test stands to original Komatsu hydraulic operational curves, ensuring perfect synergy with your main control valve (MCV).
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High Thermal Stability Against Fluid Contamination: Built with premium wear-resistant copper-alloy barrel faces to mitigate micro-scoring under high-temperature oil loops or sudden systemic shock loads common in heavy trenching or demolition attachment operations.
| OEM Part Number | Compatible Excavator Models | Haozheng Quality Guarantee |
|---|---|---|
| 708-1T-00290 | Komatsu PC50MR-2 Mini Excavator Komatsu PC55MR-2 Mini Excavator |
100% Brand New complete pump assembly. Dynamic pressure test certified up to standard machine pressure thresholds. |
Haozheng Hydraulic Production Processing Diagram
Haozheng Hydraulic Honorary Certificate
Exhibition
FAQ
Q1: Will this 708-1T-00290 pump directly replace my stock Komatsu main pump without having to swap out the existing pilot line fittings?
A: Yes. Our aftermarket 708-1T-00290 assembly is a direct drop-in unit. Every single port thread, including the main suction, high-pressure discharge split-flanges, and the sub-pilot ports, matches the metric standard used by Komatsu. You do not need to purchase any auxiliary adapter fittings; simply swap your old lines directly onto our new pump.
Q2: Excavator main pumps often suffer from sluggish boom or bucket operations if the internal pressure sensors or regulator springs aren’t set correctly. How do you calibrate your replacement units?
A: Sluggish machine cycles are usually a sign of a poorly tracking regulator. Before crating, every 708-1T-00290 complete pump undergoes an exhaustive simulation routine on our dynamic test stands. We calibrate the pressure limiter and load-sensing spring deltas ($\Delta p$) to align with Komatsu’s factory specs, ensuring that your boom, arm, and bucket receive instant, synchronized fluid power right after installation.
