511-6017 final drive for Caterpillar 336D 336E 336F 336D2 340D 340D2 340F excavator
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Travel motor reduction 508-1316 final drive for Caterpillar 301.5 301.6 301.7CR 301.8 mini excavator
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Component: Complete Final Drive Assembly (Hydraulic Travel Motor with Planetary Gearbox)
Caterpillar OEM Part Numbers: 511-6017, 511-6018, 353-0501, 470-8770, 501-7239, 507-9337, 507-9338, 507-9339, 507-9340, 507-9341, 507-9342, 511-6010, 518-3387 (5116017, 5116018, 3530501, 4708770, 5017239, 5079337, 5079338, 5079339, 5079340, 5079341, 5079342, 5116010, 5183387)
Machine Compatibility:
Caterpillar (CAT) 336D / 336D L / 336D2 / 336D2 L
Caterpillar (CAT) 336E / 336E L / 336E LH
Caterpillar (CAT) 336F / 336F L / 336F LN
Caterpillar (CAT) 340D / 340D2 / 340F L Heavy Excavator
Condition: High-Quality Aftermarket New (Complete Drop-In Unit)
Function: Converts high-pressure hydraulic flow into mechanical torque to drive track chains on 35 to 40-ton class heavy excavators.
2. Technical Specifications
Motor Type: High-Pressure Variable Displacement Axial Piston Travel Motor
Reducer Type: Heavy-Duty Multi-Stage Planetary Gear Reduction Assembly
Performance Parameters: High-torque output and speed ratios matched to C9/C9.3 ACERT powertrain requirements for heavy tracking and gradeability.
Integrated Valve Network: Includes multi-disc wet dynamic parking brake, automatic high/low two-speed shift valve, counter-balance valves, and shock-relief protection.
Mounting Interface: Precision-machined sprocket mounting pattern and heavy-duty frame flange engineered for direct match to CAT 336/340 undercarriage frames.
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. Operating an axial piston motor dry—even for a few revolutions—will score the swash plate and piston slippers, causing immediate pressure failure.
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 hub shaft seal and contaminate gearbox lubricant with hydraulic fluid.
Gearbox Oil Level & Initial Fill
Check that the planetary gear reduction hub is filled to the center level plug with high-pressure 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 Circuit 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 remove metallic contaminants.
4. Frequently Asked Questions (FAQ)
Q: Are all these part numbers (511-6017, 511-6018, 353-0501, 507-9337, etc.) interchangeable?
A: Yes. These part numbers represent Caterpillar factory supersessions, production updates, left/right frame options, and revision updates across the 336D, 336E, 336F, and 340 series. They share matching mounting dimensions, drive sprocket bolt circles, and hydraulic port threads.
Q: My CAT 336D loses tracking power on one side or tracks crooked under heavy pull. Will replacing the final drive resolve this?
A: Yes. Loss of propel torque or slow tracking speed usually points to worn axial piston groups inside the travel motor or internal gear wear within the planetary hub. Replacing the complete final drive restores equal tracking speed and pushing power.
Q: Is this final drive delivered complete with both the gearbox and motor?
A: Yes. This assembly is shipped complete as a single unit, including the high-pressure axial piston travel motor, multi-stage planetary gearbox, and pre-calibrated brake/valve blocks.
5. Shipping & Logistics
Packaging: Preserved with rust-inhibiting anti-corrosion storage oil, fitted with plastic port caps, and bolted inside an export-safe protective wooden crate.
Transit Time: Global express air freight via DHL/FedEx/UPS delivers within 3 to 7 business days, or ocean freight for heavy bulk logistics.