RD118-61290 final drive for Kubota KX121-3 mini excavator
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1. GENERAL IDENTIFICATION
Machine Model: Kubota KX121-3 (including ST/Super Tight versions)
Kubota Part Number: RD118-61290
OEM Manufacturer: Nachi-Fujikoshi
Components: Integrated Hydraulic Axial Piston Motor + Planetary Gearbox
2. PERFORMANCE SPECIFICATIONS
Motor Type: 2-Speed Variable Displacement Piston Motor
Reduction Ratio: High-ratio planetary reduction (typically around 1:40 to 1:50)
Max Operating Pressure: 24.5 MPa (3,553 PSI)
Torque Output: Engineered for high breakout and climbing force
Travel Speeds: * Low Speed: Max torque for trenching/climbing
High Speed: Faster tracking across level job sites
3. MECHANICAL INTERFACE (INSTALLATION DATA)
Sprocket Mounting: 9-Bolt or 12-Bolt pattern (Verify the bolt circle diameter on your existing sprocket).
Frame Mounting: Circular flange with standardized bolt holes for the KX121-3 undercarriage.
Hydraulic Ports:
A & B Ports: Main flow for Forward/Reverse travel.
P Port (Pilot): 2-speed shifting signal.
D Port (Drain): Case drain return to the hydraulic tank.
4. INTERNAL REPAIR COMPONENTS
If you are performing a rebuild, these are the critical sub-assemblies to inspect:
Rotary Group: Cylinder block, 9 pistons, set plate, and valve plate.
Planetary Gear Set: 1st, 2nd, and 3rd stage sun gears and planet gears.
Floating Seal (Duo-Cone): Prevents gear oil from leaking out and dirt from entering.
Main Bearings: Large angular contact bearings that support the weight of the machine and the tension of the tracks.
5. MAINTENANCE & INSTALLATION PROTOCOL
Gear Oil Type: SAE 90 or 80W-90 Gear Oil (API GL-4 or GL-5).
Gear Oil Change Interval: Initial change at 250 hours, then every 1,000 hours thereafter.
Case Drain Safety: CRITICAL. Ensure the case drain line is not restricted. A blocked drain line will cause the internal motor pressure to spike, blowing out the shaft seal or damaging the motor housing.
Installation: Ensure the mounting surfaces are perfectly clean and bolts are torqued to Kubota factory specifications.