Yanmar B14 B12-2 B12-1 B12 travel motor 172137-73361 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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China
1. GENERAL IDENTIFICATION
Machine Models:
Yanmar B12, B12-1, B12-2
Yanmar B14
Yanmar Part Numbers: 172137-73361, 172137-73351, 172137-73300
OEM Manufacturer: KYB (Kayaba) or Teijin Seiki (Nabtesco)
Configuration: Axial Piston Motor + 2-Stage Planetary Gearbox
2. PERFORMANCE SPECIFICATIONS
Motor Type: Integrated piston motor (Typically single speed for older B12, dual speed for B12-2/B14).
Max Pressure: 17.5 – 21.0 MPa (2,538 – 3,045 PSI).
Braking System: Mechanical parking brake (Spring-applied).
Torque Output: Optimized for high-climbing ability in tight residential spaces.
3. MECHANICAL INTERFACE (INSTALLATION DATA)
Sprocket Mounting: Typically an 8-bolt or 9-bolt pattern.
Note: On these older models, ensure the sprocket "pilot" diameter (the center hole) matches exactly, as different versions exist.
Frame Mounting: Circular flange.
Hydraulic Porting:
A & B Ports: Main Travel (High Pressure).
Dr (Drain): Case drain line. CRITICAL: If this line is blocked, the internal pressure will blow out the shaft seal, causing hydraulic oil to leak into the gearbox and then out of the sprocket.
4. INTERNAL REPAIR COMPONENTS
Given the age of these machines, repair kits are often used instead of full replacement:
Duo-Cone Seal (Floating Seal): The two-piece metal seal set that protects the gears from mud and water.
Rotary Group: Cylinder block and piston set for the hydraulic motor.
Planetary Gears: The small sun and planet gears that provide the mechanical reduction.
Bearings: Main hub bearings that support the weight of the excavator.
5. MAINTENANCE PROTOCOL
Gear Oil Grade: SAE 90 or 80W-90 (API GL-4).
Oil Capacity: Approx. 0.3 – 0.5 Liters.
Check/Fill Procedure: 1. Position the drive with one plug at 12 o'clock (Fill) and one at 3 or 9 o'clock (Level).
2. Fill until oil starts to weep from the side (Level) plug.
Change Interval: Every 500 – 1,000 hours.