CAT 3976960 (397-6960) Piston Pump | Fits 308E 308E2 Mini Excavator
CAT 3976960 (397-6960) Piston Pump | Fits 308E 308E2 Mini Excavator
CAT 3976960 (397-6960) Piston Pump | Fits 308E 308E2 Mini Excavator
Premium hydraulic piston pump designed as a direct OEM-compatible replacement for Caterpillar 308E and 308E2 mini excavators. Built to deliver consistent hydraulic performance and long service life in demanding construction, utility, and landscaping applications.
Product Highlights
- Part Number: 3976960 / 397-6960
- 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 landscaping projects
Technical Specifications
- Part Number: 3976960 / 397-6960
- 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 mini excavators:
- Caterpillar 308E Mini Excavator
- Caterpillar 308E2 Mini Excavator
Applications
- Mini Excavator Boom and Arm Hydraulic Circuits
- Mini Excavator Bucket and Slewing Functions
- Heavy-Duty Digging and Trenching Operations
- Construction, Utility, and Landscaping 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 308E or 308E2 mini excavators?
A: Common signs include slow or weak boom and arm response, the mini excavator struggling to dig or lift, hydraulic oil overheating during continuous operation, whining or knocking noise from the pump area, and visible hydraulic fluid leakage. The 308E and 308E2 are compact 8-ton class machines — even a slight loss of hydraulic power is noticeable in tight-site operations like utility trenching and landscaping.
Q: Does the 3976960 fit both the 308E and 308E2 mini excavators?
A: Yes, the 3976960 (397-6960) is designed as a direct OEM-compatible replacement for both the CAT 308E and 308E2 mini excavators. These models share the same pump mounting and hydraulic system. Contact us with your mini excavator serial number to confirm exact compatibility.
Q: What hydraulic functions does this pump support on a mini excavator?
A: As the main hydraulic pump on the 308E and 308E2, it supplies flow to the boom, arm, bucket, swing, and travel circuits. Mini excavators often work in confined spaces where precise hydraulic control is critical — a worn pump makes fine grading and trenching operations noticeably less accurate and efficient.
Q: Should I flush the hydraulic system when replacing this pump?
A: Always. Flushing is essential even on mini excavators — 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.
Q: What type of hydraulic oil is recommended for the 308E and 308E2?
A: Caterpillar specifies Cat HYDO Advanced 10W for most operating conditions, or 30W for high-temperature environments. Mini excavators working in landscaping and utility applications should use Cat-approved fluids to ensure long pump life and maintain warranty coverage.
Q: How do I confirm this is the correct pump for my mini excavator?
A: Check the part number on your current pump — if it reads 3976960 or 397-6960, this is the correct replacement. If the label is worn or missing, provide your 308E or 308E2 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 mini excavator configuration, you may need separate mounting bolts, gaskets, or O-rings. Contact us with your serial number and we will confirm 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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