399-2903 final drive for Caterpillar 301.7D mini excavator
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OEM Final Drive Travel Motor for CAT 301.7D Mini Excavator | Part No. 399-2903 399-3043
1. Product Overview
The 399-2903 and 399-3043 are integrated final drive assemblies, consisting of a high-torque hydraulic travel motor and a planetary reduction gearbox. As the critical component for machine propulsion, this unit provides the necessary traction and torque for the CAT 301.7D to navigate rough terrain, climb slopes, and execute precise counter-rotation. Designed for durability in compact spaces, it ensures reliable undercarriage performance for the 1.7-ton machine class.
2. Technical Specifications & Parameters
Caterpillar Part Numbers: 399-2903, 399-3043, 3992903, 3993043.
Machine Compatibility: Caterpillar (CAT) 301.7D / 301.7D CR.
Component Type: Integrated Hydraulic Piston Motor + Planetary Gearbox.
Speed Configuration: Supports two-speed (high/low) travel functions.
Sealing Technology: Features heavy-duty mechanical "floating seals" to prevent oil leaks and protect internal gears from mud and water ingress.
Mounting: OEM-standard 9-hole or 12-hole flange (depending on specific frame sub-series) for 100% direct "bolt-on" replacement.
3. Why Partner With a 13-Year Industry Expert?
Technical Precision: We understand the exact torque and flow requirements of the CAT 301.7D. Our final drives are calibrated to match factory tracking speeds, ensuring your machine travels straight without pulling to one side.
Rigorous Load Testing: Every unit undergoes a comprehensive bench test—including high-pressure leak tests and torque load cycles—to ensure zero-hour reliability.
Direct Factory Value: Benefit from our 13-year optimized supply chain, offering Original New and Premium OEM-spec alternatives at competitive wholesale prices.
Global Logistics Expertise: Units are secured in reinforced, shock-proof export packaging. We offer rapid delivery via DHL, FedEx, or UPS, typically arriving in 3 to 7 business days.
4. Critical Installation & Maintenance Protocol
Gear Oil Filling (Mandatory): The planetary gearbox section must be filled with the correct grade of gear oil (typically SAE 80W-90) before operation. Always check the fill/drain plugs to ensure proper levels.
Case Drain Connection: Ensure the case drain line is clear and properly connected. Excessive backpressure in the motor case can blow out the main shaft seal.
Hydraulic Cleanliness: When swapping the final drive, inspect the hydraulic hoses for debris. Contaminated oil is the primary cause of premature piston wear in travel motors.
Break-in Period: After installation, run the track in the air (off the ground) for several minutes in both directions to bleed air from the hydraulic circuit and ensure the brake release is functioning.
5. Ordering & Professional Support
Fitment Verification: To ensure 100% accuracy, please provide your machine Serial Number (e.g., Prefix LJ7) and the number of sprocket bolt holes.
Instant Quote: Contact us today for up-to-date pricing, tiered quality options, and current stock availability.
Technical Guidance: Our expert team is available 24/7 to provide professional guidance on installation, hydraulic pressure settings, and undercarriage troubleshooting.