102-6433 final drive for Caterpillar 311, 312 ,315, 317 midi excavator
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Component: Complete Final Drive Assembly (Hydraulic Travel Motor with Planetary Gearbox)
Caterpillar OEM Part Numbers: 102-6433, 102-6500 (1026433, 1026500)
Machine Compatibility:
Caterpillar (CAT) 311 / 311B
Caterpillar (CAT) 312 / 312B / 312B L
Caterpillar (CAT) 315 / 315B / 315B L
Caterpillar (CAT) 317 / 317B L Excavator
Condition: High-Quality Aftermarket New (Complete Drop-In Assembly)
System Function: Converts high-pressure hydraulic oil flow into mechanical rotary torque to drive track chains on 11 to 17-ton class excavators.
2. Technical Specifications
Motor Type: Variable Displacement Axial Piston Travel Motor
Reducer Type: Multi-Stage Planetary Gear Reduction System
Performance Parameters: High-torque output and speed ratios calibrated specifically to CAT 311-317 series hydraulic flow profiles and engine horsepower curves.
Integrated Control Network: Features integrated multi-disc wet dynamic parking brake, automatic high/low two-speed shift control, and shock-relief protection.
Interface Mount: Precision-machined sprocket bolt circle and frame mounting flange engineered for direct match to CAT undercarriages.
3. Critical Installation Requirements
Travel Motor Housing Priming (Mandatory)
Before operating the excavator or driving the tracks, pre-fill the axial piston travel motor casing with clean, fresh hydraulic fluid through the highest case drain port. Running an axial piston motor dry—even for a few track revolutions—will score the swash plate and piston slippers, causing immediate loss of pressure.
Verify Case Drain Line Backpressure
Inspect the low-pressure case drain hose back to the main hydraulic reservoir. Ensure there are no kinks, sharp bends, or restriction points. High backpressure in the travel motor case drain will blow out the main shaft seal and contaminate gearbox lubricant with hydraulic fluid.
Gearbox Oil Level & Initial Fill
Verify that the planetary reduction gear hub is filled to the center level plug with fresh gear oil (typically SAE 80W-90 or SAE 90). Perform an initial gear oil change after the first 50 to 100 operating break-in hours.
Hydraulic System Decontamination
If replacing a unit that suffered catastrophic internal mechanical failure, drain and flush the main hydraulic reservoir, clean oil cooler lines, and replace all main return and pilot filter elements to eliminate metallic debris.
4. Frequently Asked Questions (FAQ)
Q: Are part numbers 102-6433 and 102-6500 interchangeable?
A: Yes. These part numbers represent Caterpillar factory supersessions, production updates, and left/right side configuration references across the 311, 312, 315, and 317 model ranges. They share identical physical frame mounting dimensions, sprocket bolt patterns, and hydraulic port connections.
Q: My CAT 312 loses track power on one side or tracks crooked under heavy pull. Is the final drive failing?
A: Loss of propel torque or asymmetric tracking speed usually points to worn internal piston groups within the travel motor section or worn planetary gear sets inside the hub reducer. Replacing the complete final drive restores equal tracking power and speed.
Q: Is this final drive delivered complete with both the gearbox and motor?
A: Yes. The unit arrives fully assembled as a single complete drop-in replacement, including the high-pressure axial piston travel motor, multi-stage planetary gearbox, and pre-calibrated valve/brake manifold block.
5. Shipping & Logistics
Packaging: Preserved with anti-corrosion storage oil, sealed with plastic port caps, and bolted securely inside an export-safe protective wooden crate.
Transit Time: Global express air freight via DHL/FedEx/UPS typically delivers within 3 to 7 business days, with sea freight options available for heavy freight logistics.