CAT 4557978 (455-7978 ) Piston Pump | Fits 434F2 427F2 428F2
CAT 4557978 (455-7978 ) Piston Pump | Fits 434F2 427F2 428F2
Premium hydraulic piston pump designed as a direct OEM-compatible replacement for Caterpillar 434F2, 427F2, and 428F2 backhoe loaders. Built to deliver reliable hydraulic flow, high-pressure efficiency, and extended service life in demanding digging, loading, and construction applications.
Product Highlights
- Part Number: 4557978 / 455-7978
- Direct Fit OEM Replacement: Form, fit, and function match original Caterpillar specifications perfectly without modifications.
- Heavy-Duty Construction: Engineered with premium-grade materials and advanced rotating groups to withstand extreme hydraulic pressures and continuous workloads.
- Optimized Efficiency: Precision-machined pistons and valve plates ensure high volumetric efficiency and consistent hydraulic power to the loader and backhoe implement systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4557978 / 455-7978 |
| Product Type | Heavy-Duty Hydraulic Piston Pump |
| Brand Compatibility | Caterpillar (CAT) |
| Application | Main Hydraulic & Implement System |
| Material | High-Strength Cast Iron / Precision Alloys |
| Warranty | 12 Months Warranty |
Compatible Models & Equipment
This premium piston pump is precision-engineered to fit the following Caterpillar heavy equipment:
Backhoe Loaders
- Caterpillar 427F2 Backhoe Loader
- Caterpillar 428F2 Backhoe Loader
- Caterpillar 434F2 Backhoe Loader
Key Applications
- Backhoe & Loader Hydraulics: Powers core machine operations, including front loader bucket lifting/tilting and rear backhoe digging/booming functions.
- Heavy Construction & Excavation: Engineered for continuous high-load operations in utility trenching, infrastructure, and material handling.
- System Pressure Maintenance: Restores original hydraulic pressure and swift cycle times to your CAT backhoe loader's hydraulic circuits.
Why Choose Our Aftermarket CAT Pumps?
- Guaranteed OEM Quality: Manufactured under strict ISO 9001 quality standards to meet or exceed original equipment performance.
- Cost-Effective Solution: Get dealer-level reliability and performance at a fraction of the OEM price.
- Ready to Ship: Maintained in stock for immediate worldwide dispatch to minimize your machine's downtime.
- Industry-Leading Support: Backed by a full 1-year warranty and a team of dedicated heavy equipment hydraulic experts.
Frequently Asked Questions (FAQ)
Q: Is this piston pump a genuine Caterpillar part?
A: This is a premium-grade, OEM-compatible aftermarket replacement pump. It is designed to exact CAT engineering dimensions and standards, serving as a direct drop-in replacement for part number 455-7978.
Q: What is covered under the 12-month warranty?
A: Our 12-month warranty covers all manufacturing defects, material failures, and workmanship issues under normal operating conditions.
Q: Does this pump include the necessary seals or O-rings for installation?
A: The pump comes ready for installation. For specific sealing kits or complementary gaskets, please contact our support team during inquiry.
Q: How long does shipping take?
A: Standard in-stock orders typically ship within 3–5 business days. We also offer expedited and air freight shipping options for urgent breakdown situations.
Need a Quote for CAT 4557978?
Contact us today for the latest pricing, bulk discounts, and shipping availability.
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