Yanmar B25-1 B25 B22-2B B22-2A B22-2 B22-1 B22 YB221 Travel Motor MAG-18VP-230 final drive for Yanmar excavator
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Romania, Maramures
Poland, Koziegłowy
Romania, Bucharest
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Romania, Bucharest
Romania, Bucharest
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Ukraine, Khmelnytskyi
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1. GENERAL IDENTIFICATION
Machine Models: * B-Series: B22, B22-1, B22-2, B22-2A, B22-2B
B25, B25-1
YB-Series: YB221
OEM Manufacturer: Teijin Seiki / Nabtesco / KYB
OEM Model Series: MAG-18VP-230F / MAG-18VP-350F
Yanmar Part Numbers: * 172141-73350 / 172141-73351 (Standard YB221/B22)
172434-73350 / 172452-73300 (Standard B22-2 / B25)
172171-73700
2. PERFORMANCE SPECIFICATIONS
Motor Type: Two-speed axial piston motor.
Reduction Type: Integrated 2-stage planetary reduction.
Max Pressure: 21.0 MPa (3,045 PSI).
Brake Type: Automatic hydraulic release parking brake.
Two-Speed Function: Integrated pilot-operated swashplate shift.
3. MECHANICAL INTERFACE (INSTALLATION DATA)
Sprocket Mounting: Typically 9-bolt or 10-bolt (Verify your sprocket bolt circle diameter).
Frame Mounting: Circular flange (Standard 2.0-ton class spacing).
Hydraulic Port Connections:
A & B Ports: Main flow (Forward/Reverse).
Case Drain: Low-pressure return. Crucial: Ensure this line is clear to prevent blowing the motor shaft seal.
Speed Shift Port: Pilot line to toggle between High/Low speed.
4. INTERNAL REPAIR COMPONENTS
If rebuilding the MAG-18VP unit:
Rotary Group: Cylinder block, 9 pistons, valve plate, and retainer plate.
Floating Seal (Duo-Cone): The main seal preventing gear oil from leaking out and dirt from entering.
Sun Gear & Planet Gears: Check for pitting on the 1st stage sun gear teeth.
Main Bearings: Large angular contact bearings supporting the outer hub.
5. MAINTENANCE PROTOCOL
Gear Oil Grade: SAE 90 or 80W-90 (API GL-4 or GL-5).
Oil Capacity: Approx. 0.4 – 0.6 Liters.
Check Interval: Every 250 hours.
Change Interval: Every 1,000 hours.
Warning: If gear oil appears milky, the floating seal has failed. If it appears dark and thin (like hydraulic fluid), the motor shaft seal has failed.