Kubota KX161-3 travel motor RD511-61290 final drive for mini 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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1. GENERAL IDENTIFICATION
Machine Model: Kubota KX161-3, KX161-3SS, KX161-3ST
Kubota Part Numbers: RD511-61290, RD511-61293, RD511-78000 (Current Standard)
OEM Manufacturer: KYB (Japan)
Assembly Type: Two-speed Integrated Hydraulic Motor + Planetary Reducer
2. PERFORMANCE SPECIFICATIONS
Motor Type: Swash-plate Type Variable Displacement Axial Piston Motor.
Speeds: 2-Speed (Automatic Downshift compatible).
Reduction Ratio: High-ratio 2-stage planetary reduction.
Operating Pressure: 24.5 MPa (3,553 PSI).
Max Torque Output: Approx. 6,800 – 7,200 N·m.
Brake System: Built-in hydraulic release, spring-applied parking brake.
3. MECHANICAL INTERFACE (INSTALLATION DATA)
Sprocket Mounting: Typically 9-Bolt or 12-Bolt flange (Confirm your sprocket hole count before ordering).
Frame Mounting: Multi-bolt circular flange mounting to the track frame.
Hydraulic Port Connections:
Main Ports (A & B): High-pressure travel lines.
Speed Change Port (P): Pilot signal for shifting between high/low range.
Case Drain Port (D): Essential return-to-tank line for lubrication and cooling.
4. INTERNAL REPAIR COMPONENTS
If you are performing a component-level rebuild, these are the primary sub-assemblies:
Rotary Group: Cylinder block, 9 pistons with shoes, set plate, and valve plate.
Planetary Carrier: 1st and 2nd stage planetary gears, sun gears, and needle rollers.
Sealing System: Floating seal (Duo-cone) kit and the high-pressure main shaft seal.
Bearings: Main hub angular contact ball bearings (support the machine's load).
5. MAINTENANCE & INSTALLATION PROTOCOL
Gear Oil Grade: SAE 90 or 80W-90 Gear Oil (API GL-4 or GL-5).
Oil Capacity: Approx. 1.0 – 1.2 Liters (Fill until oil is level with the side plug).
Change Interval: First change at 250 hours; subsequent changes every 1,000 hours.
Drain Line Safety: CRITICAL. Ensure the case drain line is completely free of obstructions. Backpressure in the drain line will cause immediate failure of the motor shaft seal.