PHV-1B-12B final drive for Kubota U15-3 U17-3 mini excavator
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1. GENERAL IDENTIFICATION
Machine Models: Kubota U15-3, U17-3, U17-3α (Alpha)
OEM Manufacturer: Nachi-Fujikoshi (Japan)
OEM Model Series: PHV-1B-12B-P-8501A / PHV-1B-12B
Kubota Genuine Part Numbers (Cross-Reference):
RA221-61290 / RA229-61290 (Standard U15/U17)
RA251-61290 / RA251-61292 / RA251-61293
RB238-61292 / RA209-61290
Note: These parts are often interchangeable depending on the specific machine serial number and sprocket bolt pattern.
2. PERFORMANCE SPECIFICATIONS
Motor Type: Two-speed Axial Piston Motor.
Reduction Type: Integrated Planetary Gear Reduction.
Max Operating Pressure: 21.0 MPa (3,045 PSI).
Displacement (High/Low): Designed to match the 1.7-ton machine's hydraulic flow for seamless "Auto-Shift" operation.
Braking: Integrated mechanical parking brake, hydraulically released.
3. MECHANICAL INTERFACE (INSTALLATION DATA)
Sprocket Mounting: Typically a 9-bolt or 10-bolt pattern.
Frame Mounting: Circular flange with specialized spacing for the narrow-track frames of the U17 series.
Hydraulic Port Connections:
Forward/Reverse (A/B): Main high-pressure inlets.
Case Drain (Dr): Low-pressure return to tank (Crucial for motor longevity).
High-Speed Pilot (P): Signal line to shift the swashplate for faster travel.
4. INTERNAL REPAIR COMPONENTS
If you are rebuilding the unit, these are the primary wear parts:
Rotary Group: Cylinder block, 9 pistons, valve plate, and swashplate support.
Planetary Gears: 1st and 2nd stage planet gears and sun gear.
Floating Seal (Duo-Cone): The main seal between the fixed and rotating halves of the drive.
Bearings: Main hub bearings (often the first to fail if gear oil is contaminated).
5. MAINTENANCE & INSTALLATION PROTOCOL
Gear Oil Grade: SAE 90 or 80W-90 (API GL-4 or GL-5).
Oil Capacity: Approx. 0.33 – 0.5 Liters (Extremely small volume; even a small leak can cause total failure quickly).
Initial Change: After the first 50–100 hours of use on a new/rebuilt unit.
Case Drain Safety: CRITICAL. Ensure the drain line is free of kinks. High backpressure in this line will blow the motor shaft seal, allowing hydraulic oil to mix with gear oil.