Rexroth High Pressure Gear Pump with 1800 rpm Speed and 350 MPA Load Capacity

Product Specification

PGH4-2X/080RE07VU2
PGH4-2X/050RE11WU2
PGH4-3X/025RE11WU2
PGH5-2X/200RE07VU2
PGH4-2X/032RF18VK0 German Rexroth quantitative hydraulic pump original stock gear pump

FAQ:

Q1: What is the PGH series gear pump, and what are its key features?

The Rexroth PGH series comprises fixed displacement, gap-compensated internal gear pumps known for their robust construction and efficient performance. Key features include high operating pressures (up to 350 bar), a wide speed range (typically 200 to 3000 rpm), and compatibility with various hydraulic fluids like HLP, HEES, and HFDU. Their design ensures smooth operation, precise flow control, and through-drive capability for multi-pump configurations.

Q2: What are the common applications for PGH pumps?

PGH pumps are widely used in industrial hydraulic systems, including ventilation and pressure compensation systems, mobile machinery, machine tools, and automation equipment. They are suitable for applications requiring reliable, continuous flow under moderate to high pressures.

Q3: What hydraulic fluids are compatible with PGH pumps?

PGH pumps are compatible with standard hydraulic fluids such as HLP, HEES (synthetic esters), and HFDU (phosphate esters). The optimal operating viscosity range is 10 to 300 mm²/s. Fluid temperature should generally be maintained between -10°C to +80°C for HLP fluids and -10°C to +50°C for special fluids.

Q4: What are the most common causes of gear pump failure?

Common failure causes include:

• Fluid Contamination: Dirt, debris, or air bubbles can cause internal wear, clogging, and failure.

• Overheating: Excessive heat can break down lubricants, damage seals, and cause bearing failure. This can result from high fluid temperatures, insufficient lubrication, or overloading.

• Mechanical Wear and Tear: Misalignment, excessive pressure, or running outside specified parameters can accelerate wear on gears, bearings, and seals.

• Cavitation: This occurs when the pump is starved of fluid, often due to a clogged inlet filter, restricted suction line, or low fluid level, leading to noise and damage.

Q5: How can I troubleshoot low or no flow from my PGH pump?

• Check that the reservoir fluid level is adequate.

• Inspect the suction line and inlet filter for blockages or clogs and clean them if necessary.

• Ensure the fluid viscosity is within the recommended range for the operating temperature.

• Check for air leaks in the suction line and ensure all connections are tight.

• Verify that the pump's rotation direction is correct.

• Inspect internal components (gears, shaft seal) for excessive wear.

Q6: How can I resolve issues with low system pressure or pressure fluctuations?

• Internal Leakage: Check for worn gears, pump housing, or side plates, which can cause internal leaks and pressure loss. Replacing worn parts is often necessary.

• System Relief Valve: A malfunctioning or incorrectly set relief valve can cause low pressure. Verify its setting and functionality.

• Fluid Contamination: Contaminated fluid can damage precision surfaces and cause erratic pressure. Check filters and change the fluid if needed.

• Cavitation: As above, cavitation can also cause pressure fluctuations and must be addressed by ensuring proper suction conditions.

Q7: What should I do if the pump is overheating or unusually noisy?

• Overheating: Ensure the fluid viscosity is correct, the system cooler is functioning, and the pump is not overloaded. Check for restrictions in the discharge line.

• Noise/Vibration: This can indicate cavitation (check suction side), air in the fluid (bleed the system), mechanical wear in bearings or gears, or misalignment between the pump and drive motor. Correct the alignment if necessary.

Q8: What are the essential maintenance practices for PGH gear pumps?

• Regular Inspection: Perform visual checks for leaks, unusual noises, and overheating.

• Fluid Maintenance: Use clean, recommended fluid and monitor its condition. Regularly check and replace suction and pressure filters.

• Lubrication: Ensure bearings are properly lubricated according to manufacturer specifications.

• Seal and Connection Check: Inspect shaft seals and pipe connections for leaks and tighten or replace them as needed.

• Alignment Check: Periodically verify the alignment between the pump and the drive motor.

Q9: Can I get assistance with technical issues or order replacement parts?

Yes, most suppliers and manufacturers offer technical support. For genuine replacement parts (e.g., seals, gears, bearings) and specific troubleshooting guidance for your PGH model, it is recommended to contact the supplier or Bosch Rexroth directly.