708-3S-00961 hydraulic pump for Komatsu PC56-7 PC57-7 mini excavator
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1. Product Authenticity & Compatibility
This pump is the latest engineering revision, designed to replace older or superseded part numbers while ensuring 100% mounting and performance alignment.
Primary OEM Part Number: 708-3S-00961
Historical Substitutions: 708-3S-00960, 708-3S-00522, 708-3S-00521
Machine Fitment: * Komatsu PC56-7
Komatsu PC57-7
Designation: Original Brand New (Genuine Komatsu/Nachi Packaging).
2. Technical Superiority of the Original Pump
Choosing the Original Brand over aftermarket alternatives is critical for the Dash-7 series due to the complexity of the internal regulators:
Synchronized Flow Sharing: The original internal valve plates are precision-ground to ensure that when you operate the boom and bucket simultaneously, the pump divides flow exactly according to joystick priority. Aftermarket pumps often cause "function drop" where one movement slows down significantly.
Optimized Power Curves: The LS (Load Sensing) and PC (Pressure Compensation) valves are pre-set to the engine’s specific torque curve. This prevents the engine from "stalling" or "lug-down" when the hydraulic system hits maximum relief pressure.
Superior Metallurgy: Original pumps utilize high-silicon alloy cylinder blocks and hardened swash plates, which are essential for surviving the high-heat, high-pressure cycles common in 5-ton excavation work.
3. Critical Installation Protocol for Original Units
To protect the warranty and lifespan of a genuine 708-3S-00961, our 13 years of expertise recommends the following:
Case Priming: Fill the pump housing with fresh hydraulic oil via the top-most case drain port before cranking the engine. Running a new original pump dry will damage the piston shoes immediately.
System Decontamination: If the previous pump failed mechanically (internal breakage), you must flush the hydraulic tank and clean the oil cooler. Microscopic debris from the old pump will act like sandpaper on the new precision-lapped surfaces.
Filtration: Replace both the suction strainer and the high-pressure return filter with genuine Komatsu filters.
Oil Quality: Use ISO VG46 or VG32 (depending on climate) that meets or exceeds Komatsu’s high-pressure anti-wear specifications.
4. Logistics & Professional Support
Packaging: Shipped in a reinforced, moisture-sealed export wooden crate to prevent any damage to the shaft or mounting flange.
Validation: Every original pump we provide is verified against your Machine Serial Number to ensure the input shaft spline count and pilot diameter are a 100% match.
Delivery: Global express shipping via DHL, FedEx, or UPS, typically arriving at your site within 3 to 7 business days.
5. Quote Request
To provide you with the most accurate pricing and availability for a Genuine 708-3S-00961, please confirm:
Your Machine Serial Number.
Your shipping destination.
Would you like to proceed with a formal quote for the Original Brand New unit, or do you need assistance identifying the specific ports for an upcoming installation?