REXNORD PU343 Bearing Blocks

( Brand: Rexnord ), ( Manufacturer Part Number: PU343 ), ( Part Type: Bearing Block )

Review REXNORD Used

The Rexnord PU343 is a robust and versatile **positive displacement gear pump**, engineered to deliver reliable, high-pressure fluid transfer in demanding industrial applications. Part of Rexnord s trusted line of hydraulic and fluid power solutions, this pump is designed with precision-crafted internal components to ensure consistent performance under extreme conditions. Its compact yet durable construction features a **gerotor-style internal gear mechanism**, combining a rotating internal gear with an eccentric external gear to create a smooth, pulsation-free flow ideal for applications requiring steady, low-to-medium flow rates with minimal noise and vibration. Constructed from high-grade materials, including hardened steel gears and bronze or cast iron housings, the PU343 is built to withstand continuous operation in environments where reliability is critical, such as in material handling, chemical processing, or mobile hydraulic systems.

The pump s robust shaft seal system, often featuring a robust lip or mechanical seal, provides excellent protection against leakage while maintaining efficiency, even with abrasive or contaminated fluids. Its versatile mounting options, including foot, flange, or direct shaft coupling, allow for easy integration into existing systems, while the adjustable pressure relief valve ensures safe operation by preventing overpressurization. With a wide operating temperature range typically from -20 F to 250 F (-29 C to 121 C) the PU343 excels in both cold and high-temperature applications, making it suitable for a variety of fluids, including oils, fuels, and light hydraulic fluids, though compatibility should always be verified with the specific fluid properties. Whether used in industrial machinery, agricultural equipment, or marine systems, the Rexnord PU343 delivers dependable performance with minimal maintenance, reinforcing its reputation as a workhorse in fluid power solutions.

### **Pros and Cons of Buying a Rexnord PU343 (Pump Unit)**

The **Rexnord PU343** is a popular **positive displacement pump** commonly used in industrial applications, including **hydraulic systems, chemical processing, and fluid transfer**. Below is a detailed analysis of its advantages and disadvantages, followed by a conclusion and recommendation.

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### **Pros of the Rexnord PU343**

1. **High Flow Rate and Pressure Capability**

- The PU343 is designed for **high-volume fluid transfer** and can handle **moderate to high pressures**, making it suitable for demanding applications such as **hydraulic systems, lubrication, and coolant circulation**.

2. **Durable Construction**

- Built with **cast iron or steel components**, it offers **long-term reliability** in harsh environments, including **high-temperature and abrasive fluid conditions**.

- The **sealed design** reduces the risk of contamination from external debris.

3. **Versatile Fluid Compatibility**

- Works effectively with **oils, hydraulic fluids, water-based coolants, and some chemicals**, depending on the material of construction (e.g., stainless steel for corrosive fluids).

- Can handle **viscous fluids** better than centrifugal pumps in certain cases.

4. **Low Maintenance Requirements**

- Fewer moving parts compared to some other pump types, leading to **reduced wear and tear** over time.

- **Self-priming capability** in many models, eliminating the need for a separate priming system.

5. **Compact and Space-Efficient Design**

- The **modular construction** allows for easy installation in **tight or confined spaces**, which is beneficial in industrial settings with limited room.

6. **Good for Low to Medium Head Applications**

- While not ideal for **high-head applications**, it performs well in **medium-pressure systems** where positive displacement is advantageous.

7. **Compatibility with Rexnord s Ecosystem**

- If already using **Rexnord components**, integrating the PU343 can simplify **maintenance and spare parts availability**.

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### **Cons of the Rexnord PU343**

1. **Limited Pressure Range for Some Applications**

- While it handles **moderate pressures well**, it may **struggle in extremely high-pressure systems** (e.g., above 3,000 PSI), where **gear pumps or piston pumps** might be more suitable.

2. **Potential for Cavitation in Low-Flow, High-Suction Lift Conditions**

- Like many positive displacement pumps, the PU343 can **cavitate** if the **suction pressure is too low** or if the fluid level is insufficient, leading to **reduced efficiency or damage**.

3. **Higher Initial Cost Compared to Simpler Pumps**

- The **durability and performance** come at a premium price, making it **less cost-effective for low-demand applications** where a **centrifugal pump** would suffice.

4. **Noise and Vibration in Some Operating Conditions**

- Positive displacement pumps can generate **more noise and vibration** than centrifugal pumps, which may require **additional damping or isolation** in sensitive environments.

5. **Sensitivity to Fluid Contamination**

- While the **sealed design helps**, **abrasive particles or debris** can still damage internal components over time, requiring **frequent filter maintenance**.

6. **Limited Self-Cleaning Capability**

- Unlike some **centrifugal pumps**, the PU343 does not **self-clean** as effectively, meaning **clogging risks** are higher if the fluid contains solids.

7. **Requires Proper Lubrication and Sealing**

- **Mechanical seals and lubrication points** must be **regularly inspected and maintained** to prevent leaks and premature failure.

8. **Not Ideal for High-Speed Applications**

- The PU343 is **not optimized for extremely high RPMs**, which could lead to **excessive wear** if operated beyond its specified speed range.

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### **Conclusion**

The **Rexnord PU343** is a **reliable, durable, and high-performance positive displacement pump** that excels in **industrial applications requiring consistent flow and moderate to high pressure**. Its **robust construction, low maintenance needs, and compatibility with viscous fluids** make it a strong choice for **hydraulic systems, lubrication, and coolant circulation**.

However, it is **not the best fit** for **high-head, low-flow, or extremely high-pressure applications**, nor is it the most cost-effective solution for **low-demand or clean fluid systems** where a **centrifugal pump** would work just as well. Additionally, **proper installation, maintenance, and fluid conditioning** are critical to maximizing its lifespan and performance.

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### **Recommendation**

You need a **durable, high-flow pump** for **hydraulic, lubrication, or coolant applications** with **moderate to high pressure requirements**.

Your system involves **viscous or abrasive fluids** where a **positive displacement pump** is necessary.

You operate in an **industrial environment** where **reliability and longevity** are prioritized over cost.

You already use **Rexnord components**, ensuring **easier maintenance and spare parts availability**.

Your application requires **extremely high pressure** (beyond 3,000 PSI) or **ultra-high head** (where gear or piston pumps may be better).

You are working with **clean, low-viscosity fluids** where a **centrifugal pump** would be sufficient and more cost-effective.

Your budget is **limited**, and a **simpler, lower-cost pump** (e.g., a basic gear pump) can meet your needs.

Your system has **frequent suction lift issues**, increasing cavitation risks.

The **Rexnord PU343 is a strong investment** for **industrial users** who need a **tough, efficient pump** for demanding fluid transfer tasks. However, **careful consideration of application requirements** is essential to ensure it aligns with your operational needs. If in doubt, consult a **fluid power specialist** to confirm compatibility before purchasing.

Details:

Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection. All products are guaranteed to be working but may show signs of use. Call to use a shipping service other than the ones listed. The product is used surplus.

Part Number PU343.

part #: pu343 prices

• $500.00-$1030.00

specifications linactuat:

• brand: Rexnord
• mpn: Pu343
• part type: Bearing Block

general linactuat:

• condition: Used
• Industrial Automation Motion Controls > Rotary Linear Motion > Bearing Blocks Supports

offer linactuat:

• options: Ship-to-home
• started: February 26, 2026
• availability: In Stock
• sold: 0
• quantity: 1

returns linactuat:

• method: Money back
• time: 30 Days
• policy: Returns Accepted
• paid by: Buyer

shipping linactuat:

• service: Standard
• type: Fixed
• cost: $12.90
• transit: 2-5 Days
• class: Standard

seller linactuat:

• rating: 99.6%
• # reviews: 191990
• city: 1 Millennium Dr, Willingboro, NJ 08046

payments linactuat:

• other
• wallet: Apple-pay
• credit card: Discover

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