CAT 9T6857 (9T-6857) Piston Pump | Fits 416 428 Backhoe Loader
CAT 9T6857 (9T-6857) Piston Pump | Fits 416 428 Backhoe Loader
CAT 9T6857 (9T-6857) Piston Pump | Fits 416 428 Backhoe Loader
Premium hydraulic piston pump designed as a direct OEM-compatible replacement for Caterpillar 416 and 428 backhoe loaders. Built to deliver consistent hydraulic performance and long service life in demanding construction, utility, and municipal applications.
Product Highlights
- Part Number: 9T6857 / 9T-6857
- Direct Fit: No modifications required
- High Performance: Meets or exceeds original Caterpillar specifications
- Durable Construction: Precision-engineered for long service life
- Wide Application: Suitable for construction, utility, and municipal projects
Technical Specifications
- Part Number: 9T6857 / 9T-6857
- Product Type: Variable Displacement Piston Pump
- Brand Compatibility: Caterpillar (CAT)
- Application: Hydraulic System
- Warranty: 12 Months
Compatible Models
This piston pump fits the following Caterpillar backhoe loaders:
- Caterpillar 416 Backhoe Loader
- Caterpillar 428 Backhoe Loader
Applications
- Backhoe Loader Lift and Tilt Functions
- Backhoe Loader Dig and Swing Circuits
- Heavy-Duty Excavation and Loading Operations
- Construction, Utility, and Municipal Projects
Why Choose This Pump?
- Quality Guaranteed - Manufactured to meet OEM standards
- Ready to Ship - In stock and available for immediate dispatch
- Expert Support - Technical assistance available
- Competitive Pricing - Cost-effective alternative to dealer parts
Frequently Asked Questions
Q: What are the symptoms of a failing hydraulic piston pump on CAT 416 or 428 backhoe loaders?
A: Common signs include slow or weak loader lift and tilt response, the backhoe dig function losing power, hydraulic oil overheating, whining or knocking from the pump area, and visible hydraulic fluid leakage. The CAT 416 and 428 are older-generation backhoe loaders still widely used in construction — pump failure affects both the front loader bucket and rear backhoe digging performance simultaneously.
Q: Does the 9T6857 fit both the 416 and 428 backhoe loaders?
A: Yes, the 9T6857 (9T-6857) is designed as a direct OEM-compatible replacement for both the CAT 416 and 428 backhoe loaders. These models share the same pump mounting and hydraulic system architecture. Contact us with your backhoe serial number to confirm exact compatibility.
Q: What hydraulic functions does this pump support on a backhoe loader?
A: As the main hydraulic pump, it supplies flow to both front loader circuits (lift, tilt) and rear backhoe circuits (boom, stick, bucket, swing). It also supports auxiliary functions such as stabilizer legs. A failing pump causes weak operation across all functions — if only one function is affected, the problem may be a control valve rather than the pump itself.
Q: Should I flush the hydraulic system when replacing this pump?
A: Always. Flushing is essential — metal contaminants from the old pump can destroy the new pump within hours. Drain and replace all hydraulic oil, flush the system with clean oil, replace all filters, and refill with fresh Cat HYDO Advanced hydraulic oil. Older backhoe loaders like the 416 and 428 may have accumulated more system contamination over their service life, making a thorough flush even more important.
Q: What type of hydraulic oil is recommended for the 416 and 428 backhoe loaders?
A: Caterpillar specifies Cat HYDO Advanced 10W or 30W depending on operating temperature. Older backhoe loaders working in construction and utility applications should use Cat-approved fluids to ensure long pump life and maintain reliability. Using non-approved fluids can cause accelerated wear and void the warranty.
Q: How do I confirm this is the correct pump for my backhoe loader?
A: Check the part number on your current pump — if it reads 9T6857 or 9T-6857, this is the correct replacement. If the label is worn or missing (common on older machines), provide your backhoe serial number and we will verify compatibility before you order.
Q: Does this pump come with mounting hardware or gaskets included?
A: The pump is supplied as a complete unit. Depending on your backhoe configuration, you may need separate mounting bolts, gaskets, or O-rings. Contact us with your serial number and we will confirm exactly what is included and what additional parts you may need for installation.
Q: What is the warranty on this hydraulic piston pump?
A: This piston pump comes with a 12-month warranty covering manufacturing defects. The warranty does not cover damage caused by contaminated hydraulic oil, improper installation, failure to flush the hydraulic system, or using non-CAT approved hydraulic fluids.
Looking for this hydraulic pump? Contact us today for pricing, availability, and lead time information.
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