399-2947 hydraulic pump for Caterpillar 301.7D CR mini excavator
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Product Name: Hydraulic Main Pump for Caterpillar (CAT) 301.7D CR Mini Excavator
Compatible Part Numbers: 399-2947 / 399-3051 / 3992947 / 3993051
Applicable Machine: Caterpillar 301.7D CR (Compact Radius) Mini Excavator
1. Product Overview
The 399-2947 and 399-3051 series represent the core power unit of the CAT 301.7D CR hydraulic system. This variable displacement axial piston pump is specifically engineered to provide high-pressure fluid flow for multi-function operations, including digging, tracking, and auxiliary tool use. Its compact, high-density design is tailored for the "Compact Radius" (CR) chassis, ensuring maximum hydraulic efficiency within a limited engine compartment space.
2. Technical Specifications & Parameters
Pump Type: Variable Displacement Axial Piston Pump
Operating Pressure: Rated for high-pressure cycles (up to 240–280 bar) to maximize bucket breakout force.
Flow Characteristics: Load-sensing capability that adjusts flow based on demand, reducing fuel consumption and heat generation.
Housing Material: High-strength, anti-wear alloy casting for superior thermal stability.
Internal Components: Precision-lapped valve plates, hardened piston sets, and heavy-duty bearings for extended service life.
Mounting: Standard SAE-style flange and spline shaft for 100% direct "bolt-on" replacement.
3. Why Partner With a 13-Year Industry Expert?
Technical Authority: We specialize in the specific hydraulic requirements of the CAT mini excavator series, ensuring every pump is calibrated to match original factory performance curves.
Rigorous Testing: Every unit undergoes a comprehensive hydraulic bench test to verify volumetric efficiency, pressure stability, and response times before shipment.
Tiered Quality Solutions: We offer Original New, Premium OEM Replacement, and Certified Remanufactured units to align with your project budget and machine life cycle.
Global Logistics Expertise: All pumps are secured in reinforced, shock-proof export wooden crates. We offer rapid delivery via DHL, FedEx, and UPS, typically arriving in 3 to 7 business days.
4. Critical Installation & Maintenance Protocol
Case Priming (Mandatory): You must fill the pump housing with clean, fresh hydraulic oil through the highest drain port before starting the engine. Running a pump "dry" will cause immediate and irreversible internal damage.
System Decontamination: If the previous pump suffered a mechanical failure, you must flush the hydraulic tank and lines. Residual metallic debris is the primary cause of premature failure in new pumps.
Filter Mandate: Always install a new high-efficiency hydraulic return filter and suction strainer during the pump replacement process.
5. Ordering & Professional Support
Fitment Verification: To ensure 100% accuracy, please provide your machine Serial Number (e.g., Prefix LJ7) or a photo of your existing pump nameplate.
Instant Quote: Contact us today for up-to-date pricing, tiered quality options, and current stock status.
Technical Guidance: Our expert team is available 24/7 to provide guidance on system flushing, initial startup procedures, and hydraulic troubleshooting.