399-2947 hydraulic pump for Caterpillar 301.7D mini excavator
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1. Product Overview
The 399-2947 and 399-3051 are high-performance axial piston pumps that serve as the primary power source for the CAT 301.7D mini excavator's hydraulic system. Engineered for precision and efficiency, these pumps provide the necessary flow and pressure for digging, traveling, and auxiliary tool operations. They are designed to meet the rigorous performance standards of Caterpillar’s compact machinery, ensuring smooth multi-function operation and fuel efficiency.
2. Technical Specifications & Parameters
Part Numbers: 399-2947, 399-3051, 3992947, 3993051.
Machine Compatibility: Caterpillar (CAT) 301.7D / 301.7D CR.
Pump Type: Variable Displacement Axial Piston Pump.
Operating Pressure: Calibrated to factory relief settings (typically 240–280 bar) to ensure maximum breakout force.
Construction: Heavy-duty cast iron housing with precision-engineered internal piston and swash plate assemblies.
Mounting: Direct OEM-standard flange and spline shaft for a "plug-and-play" replacement.
3. Why Partner With a 13-Year Industry Expert?
Technical Mastery: We understand the exact flow requirements and pressure curves of the CAT 301 series. Our pumps are calibrated to restore "like-new" speed and power to your machine.
Rigorous Bench Testing: Every unit is subjected to a comprehensive hydraulic test to verify volumetric efficiency, pressure stability, and response times before it is crated.
Factory-Direct Pricing: By leveraging our 13-year optimized supply chain, we offer competitive wholesale pricing that provides significant savings over local retail dealerships.
Global Logistics Expertise: All pumps are secured in reinforced, shock-proof export wooden crates. We offer rapid delivery via DHL, FedEx, or 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 the pump "dry" will cause immediate and irreversible internal damage to the bearings and pistons.
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 to protect the precision-lapped surfaces of the new unit.
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’s nameplate.
Instant Quote: Contact us today for up-to-date pricing, tiered quality options (Original New vs. Premium OEM), and current stock status.
Technical Guidance: Our expert team is available 24/7 to provide professional guidance on system flushing, initial startup procedures, and hydraulic troubleshooting.