Yanmar B30, Yanmar B37 Swing Vertical Shaft and Gerotor Rotor

Yanmar B30, Yanmar B37 Swing Vertical Shaft and Gerotor Rotor

2 month ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 4 year year

Product details

Yanmar B30, Yanmar B37 Swing Vertical Shaft and Gerotor Rotor

1. Product Overview

These swing vertical shaft and gerotor rotor are core internal wearing parts for the slewing gerotor motor fitted on Yanmar B30 and B37 mini excavators. The gerotor rotor assembly, also known as orbit rotor set, together with the vertical drive shaft, forms the key transmission unit of the slewing hydraulic system. Manufactured with high-precision machining and surface quenching treatment, these replacement parts fully match the original dimensions of Yanmar B30 and B37 models. They are widely used for overhaul and repair of the swing motor, solving problems such as weak slewing torque, internal leakage and abnormal noise of the original motor.

Yanmar B30 Swing Vertical Shaft and Gerotor Rotor belong to high‑precision Hydraulic Pump Spare Parts for mini excavator swing motor. Driven by pressure oil supplied from the main hydraulic pump, also known as Hydraulic piston pump, these core internal components transmit torque and realize slewing action inside the complete hydraulic system. Specially matched for Yanmar B30 mini excavator swing motor, they are widely used for motor overhaul, worn‑part replacement and aftermarket spare‑parts supply.

Model Description

Slewing vertical shaft and gerotor rotor kit exclusively for Yanmar B30 and B37 mini excavators.

2. Main Technical Parameters

Item Specification

Applicable Models Yanmar B30, Yanmar B37 mini excavator

Material Alloy steel with carburizing quenching treatment

Surface Hardness HRC 58~62, high wear resistance

Machining Tolerance OEM equivalent precision

Working Pressure Max continuous pressure 21MPa

Fit Type Interference fit with stator and motor housing

Component Includes Swing vertical shaft, inner gerotor rotor, outer stator

Operating Temperature -20℃ ~ +90℃

3. Working Principle

High-pressure hydraulic oil flows into the gerotor motor hydraulic system, pushing the meshed gerotor rotor to perform planetary orbital motion inside the stator. The rotor drives the swing vertical shaft to output torque and rotational force, which drives the upper structure of the mini excavator to rotate smoothly. The precise clearance between rotor and stator ensures low internal leakage and stable low-speed performance. The vertical shaft transmits torque reliably and bears radial and axial loads during slewing operation.

4. Core Advantages

1. Made of high-strength alloy steel with heat treatment, excellent wear resistance and long service life.

2. Precision CNC machining, exactly the same size as OEM parts, direct replacement without modification.

3. Tight fit clearance greatly reduces internal leakage, restores original swing power.

4. High load resistance, able to withstand frequent starting and braking of mini excavators.

5. Complete repair kit, convenient for motor disassembly and on-site overhaul.

6. Cost-effective aftermarket parts, much lower cost than buying whole original swing motor.

5. Application Range

These gerotor rotors and swing vertical shafts are specially applied to the slewing gerotor motor of Yanmar B30 and B37 small excavators, serving the excavator slewing hydraulic system for landscaping, municipal engineering and indoor construction works.

6. Common Faults & Replacement Suggestion

Typical failure symptoms: slow rotation speed, weak turning power, abnormal rattling noise, motor drifting when stopping rotation. Replace the gerotor rotor and vertical shaft set together during maintenance to recover motor performance.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 Audited supplier

4 year

Address: Ningbo, China

Main Product: hydraulic motor , gear box, hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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