330-7517 191-1384 337-3485 Final Drive for CAT 305 305.5 306 | Travel Motor

Heavy 4114 N·m Tractive Power for 5.0–6.0T Cater Earthmovers. OEM-standard replacement Nachi PHV-3B high-displacement hydraulic travel motor complete with integrated planetary reduction gearbox, engineered specifically for Caterpilla (CAT) 305, 305.5, and 306 mini excavators.

1. Technical Operating Specifications

(Authority verified via Caterpilla SIS parts catalogs & compact hydraulic databases)

2. Resolving CAT 305/305.5 Incline Runaway & Counterbalance Chat

Does your CAT 305 lose dynamic braking when tracking down steep ramps, or shudder under heavy blade leveling? The 5-ton Caterpilla platform demands immense tractive holding force. During prolonged grading, pressure spikes in the travel circuit fatigue the internal counterbalance valve spool (Ref #3 / 220-2365). Once the dampening orifice is scored, the motor loses modulated hydraulic resistance during deceleration, causing erratic track run-out on slopes and track chatter when counter-rotating. Installing our precision-balanced 330-7517 final drive restores full 26.0 MPa holding pressure, eliminates hydraulic shock, and delivers smooth, continuous 4114 N·m pushing traction.

3. Exploded View & Modular Component Breakdown

(Cross-reference modular service components for Caterpilla final drive group 337-3485 / 330-7517)

4. Frequently Asked Questions (Technical & Commercial)

For Machine Owners & Operators (C-End Insights)

Q: Will this complete final drive bolt directly onto my CAT 305.5 without altering hydraulic line fittings? A: Yes. It matches OEM assembly part numbers 330-7517 / 337-3485 exactly. The track frame mounting bolt pattern, drive sprocket register, and main feed port split-flanges align seamlessly with your factory undercarriage.

Q: Can I replace just the travel motor (210-2758) or counterbalance valve (220-2365) if my gearbox is undamaged? A: Yes. Modular components are fully interchangeable. However, if previous motor failure circulated metal debris into the planetary reduction hub, installing a complete pre-assembled unit (330-7517) prevents cross-contamination and avoids repeated track disassembly labor.

For Equipment Dealers & Repair Facilities (B-End Insights)

Q: How do part numbers 330-7517, 191-1384, and 337-3485 cross-reference in inventory? A: 191-1384, 330-7517, and 337-3485 represent successive factory engineering supersessions for the 305/306 series, sharing identical 1134.5 cm³/rev PHV-3B hydraulic displacement and 4114 N·m torque ratings.

Q: What is the packaging and export freight protection standard? A: Each 44 kg drive unit is treated with internal anti-corrosion fluid, sealed in heavy vapor corrosion inhibitor (VCI) poly barrier wrap, and bolted securely inside an ISPM-15 certified fumigated wooden crate built for container and air cargo transport.