Product Description
Premium factory-direct aftermarket 708-1T-00620 Main Hydraulic Piston Pump Assembly, engineered as a 100% plug-and-play interchangeable alternative for Komatsu PC55MR-3 mini excavators. Specially optimized to interface with Komatsu’s advanced Closed-Center Load Sensing System (CLSS), this complete double variable pump assembly ensures exact flow synchronization and instantaneous hydraulic response under heavy duty cycles. Built with an ultra-rigid nodular iron housing, micro-lapped high-density bimetal cylinder barrels, and induction-hardened piston groups , this main pump restores your excavator’s standard boom/arm speed and guarantees zero tracking drift right out of the crate.
Key Technical Highlights
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100% Flawless OEM Envelope Alignment: Manufactured strictly according to original Komatsu factory blueprint dimensions for part number 708-1T-00620. The mounting pilot flange, splined drive shaft, high-pressure delivery split-flanges, and rear pilot ports line up perfectly with your machine’s layout—zero installation modification required.
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CLSS Load-Sensing Synchronized Calibration: Every complete pump assembly is pre-calibrated on our test stands. We dynamically fine-tune the built-in control valve group to match Komatsu’s
-3generation precise pressure delta ($\Delta p$), preventing system hunting, engine lugging, or uneven track drifting. -
Upgraded Bimetallic Wear Pairing: Incorporates high-density copper alloy cladding on the rotor faces to heavily resist thermal expansion scoring, extending service life in extreme trenching or rock-breaking environments.
| OEM Part Number | Compatible Komatsu Machinery Frame | Haozheng Production Standard |
|---|---|---|
| 708-1T-00620 | Komatsu PC55MR-3 Hydraulic Mini Excavator | 100% Brand New Sealed Assembly. Complete with integrated controller valves, fully load-tested to original factory CLSS ratings. |
Haozheng Hydraulic Production Processing Diagram
Haozheng Hydraulic Honorary Certificate
Exhibition
FAQ
Q1: The Komatsu PC55MR-3 utilizes a highly sensitive Closed-Center Load Sensing (CLSS) system. Will your aftermarket 708-1T-00620 pump operate smoothly without causing hydraulic lag? A: Yes. The common issue with cheap aftermarket pumps is that their valve blocks fail to match the strict CLSS response curves, leading to sluggish actuator speeds or engine stalling. At our manufacturing facility, every 708-1T-00620 assembly undergoes multi-hour dynamic tracking. We pre-adjust the internal load-sensing spools to match original Komatsu factory differential specifications, certifying crisp, lag-free joystick controls right after bolting it on.
Q2: Does this pump come pre-filled with oil, and does it include new O-rings for the high-pressure ports? A: Our pumps are shipped dry but pre-lubricated internally with high-grade anti-wear fluid to protect the bimetal wear surfaces during initial startup. Every complete assembly comes securely sealed with industrial shipping plugs and includes a premium factory-grade FKM O-ring kit for your main suction and delivery ports to secure absolute zero-leakage safety.
