Buy HITACHI ZAXIS ZX120 130-3 HYDRAULIC PUMP NEEDLE BEARING (ITEM 36 OEM HI 4461927) | Tonkee®

The needle bearing is a small but integral part of the hydraulic pump, and its design and specifications are carefully engineered to ensure optimal performance and longevity in demanding construction and excavation applications.

The primary function of the needle bearing in this context is to reduce friction and facilitate smooth rotation of the pump's moving components. It achieves this by providing a rolling contact surface between the stationary and rotating parts, allowing them to move relative to each other with minimal resistance. This is essential because the hydraulic pump operates under high pressure and must efficiently convert mechanical power into hydraulic power.

The choice of materials for this needle bearing is critical to its performance. Typically, these bearings are made from high-quality alloy steel, which offers exceptional strength and durability. Additionally, the bearing may be heat-treated to enhance its hardness and wear resistance, ensuring it can withstand the rigors of heavy-duty excavation work.

Precision machining is also crucial in manufacturing this component. The needle bearing must have precise dimensions and tolerances to fit perfectly within the hydraulic pump assembly. Any deviation from these specifications could lead to increased friction, reduced efficiency, and premature wear of both the needle bearing and other pump components.

The needle bearing's design includes an outer race, inner race, and a series of cylindrical needle rollers.

The inner race fits onto the pump's shaft, while the outer race is secured within the pump housing. The needle rollers are positioned between these two races, forming the rolling contact points that allow for smooth rotation. The number and arrangement of needle rollers are carefully engineered to distribute the load evenly and minimize stress on individual components.

Furthermore, proper lubrication is vital to ensure the longevity and reliable performance of the needle bearing. The hydraulic pump's internal lubrication system ensures that the bearing receives a constant supply of hydraulic oil, reducing friction and dissipating heat generated during operation.

Maintenance and replacement of this needle bearing should adhere to the manufacturer's guidelines to guarantee the continued efficiency and safety of the excavator. Regular inspections can help identify signs of wear or damage, allowing for timely replacement to prevent more extensive and costly damage to the hydraulic pump.

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