Details

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The 120421 A1 Steering Pump is a genuine CNH hydraulic steering pump designed specifically for Case 580 L and Case 580 Super L backhoe loaders. This steering pump plays a critical role in supplying consistent hydraulic pressure to the steering system, ensuring smooth, precise, and reliable machine control during operation.

Manufactured to CNH Original (Genuine) specifications, this pump delivers stable oil flow to the steering control valve assembly, reducing steering effort and improving operator comfort—especially during heavy-duty construction, loading, and excavation work.

This part is commonly referenced within the steering control valve assembly (see Figure 5-010) and has been superseded by part number 377805A1, meaning 377805A1 is the latest replacement version approved by CNH for this application.

Key Features

• Genuine CNH Original steering hydraulic pump

• Provides consistent hydraulic pressure for steering control

• Ensures smooth and responsive steering performance

• Built with high-quality materials for durability and long service life

• Direct replacement for original factory-installed unit

Compatible Models

• Case 580 L

• Case 580 Super L

Part Information

• Part Number: 120421 A1

• Superseded By: 377805A1

• Category: Steering System / Hydraulic Pump

• Brand: CNH Original (Genuine)

Application Notes

• Used in steering hydraulic circuit

• Works together with steering control valve assembly

• Recommended to replace hydraulic oil and filters when installing a new steering pump

 

120421 A1 转向泵（CNH 原厂正品）

120421 A1 转向泵 是专为 Case 580 L 与 Case 580 Super L 挖掘装载机设计的 CNH 原厂正品液压转向泵。该转向泵负责为整套转向系统提供稳定的液压油压，确保机器在各种工况下转向顺畅、精准、安全。

此产品按照 CNH 原厂标准制造，能够为转向控制阀组件持续输送液压动力，有效降低转向阻力，提高操作舒适性，特别适合重型施工与长时间作业环境。

该零件在图册中通常列于 转向控制阀总成（参见 Figure 5-010），并且 已被零件号 377805A1 所取代，377805A1 为 CNH 官方认可的最新替代型号。

产品特点

• CNH 原厂正品液压转向泵

• 提供稳定可靠的转向液压压力

• 提升转向灵敏度与操作稳定性

• 结构坚固，耐用性高，使用寿命长

• 可直接替换原厂安装件

适用机型

• Case 580 L

• Case 580 Super L

零件信息

• 零件号： 120421 A1

• 替代零件号： 377805A1

• 系统分类： 转向系统 / 液压泵

• 品牌： CNH 原厂正品

安装建议

• 安装新转向泵时建议同时更换液压油与滤芯

• 安装前确保液压系统清洁，避免杂质损坏新泵