0510725030 AZPF-1X-022RCB20KB Original German Rexroth gear pump

Frequently Asked Questions (FAQ)

1. Basic Parameters & Selection

Q: What is the displacement of this pump?

A: The geometric displacement is 22.5 cm³/rev.

Q: What is the maximum working pressure?

A: The maximum continuous working pressure is 180 bar, the maximum intermittent pressure is 210 bar, and the peak pressure is 230 bar.

Q: What is the rotation direction of the pump?

A: Clockwise rotation when viewed from the shaft end.

Q: What is the type of the pump's mounting flange interface?

A: It uses an SAE 2-bolt flange with a square flange port (ISO 8434-1).

2. Installation & Commissioning

Q: What are the requirements for the drive shaft during installation?

A: The motor drive shaft and the pump's tapered shaft must be connected via a flexible coupling. The radial runout should be less than 0.1 mm, and the angular error should be less than 1 degree. Rigid connections are strictly prohibited.

Q: What are the requirements for the inlet port?

A: The inlet line should be as short, straight, and low-resistance as possible. The absolute pressure at the pump inlet during operation must not fall below 0.7 bar. A flooded suction or a boost pump is recommended.

Q: What should be checked before the first start-up?

A: The pump housing must be filled with clean hydraulic oil. Dry running is strictly forbidden.

Q: How should the case drain port be connected?

A: The case drain line must be connected directly, without restriction, and without a filter, back to the reservoir. The connection point should be below the fluid level but above the pump centerline. The backpressure in the drain line must not exceed 1 bar.

3. Operation & Troubleshooting

Q: The pump is very noisy. What is the cause?

A: The most common causes are cavitation​ (accompanied by temperature rise) or aeration.

• Cavitation:​ Restricted inlet flow. Check for clogged inlet filters, oil viscosity that is too high, or a low oil level.

• Aeration:​ Air is being drawn into the suction line due to leaks. You can test this by submerging the suction hose in a bucket of oil.

• Mechanical Noise:​ Check for misalignment or damaged bearings.

Q: The calculated flow and the actual measured flow do not match. Is this normal?

A: Yes, this is normal. Actual Flow = Theoretical Flow × Volumetric Efficiency. The theoretical flow is 22.5 × Speed (rpm) / 1000(L/min). Volumetric efficiency is typically 90%-95%. An efficiency below 85% indicates pump wear.

Q: The pump is leaking at the shaft seal. How should I handle it?

A: First, check if the case drain line is blocked. If it is clear, the shaft seal is likely worn and needs to be replaced. Continuing operation with a leaking seal can allow contamination to enter and damage the bearings.

Q: The pressure does not reach the rated value, and the flow is also low. What is the reason?

A: Possible causes, in order of likelihood:

1. Internal Pump Wear:​ Long-term use has increased the clearance between the gear set and side plates, leading to high internal leakage.

2. System Leakage:​ Check other valves and actuators in the system.

3. Low Motor Speed.

4. Oil Viscosity is too low.

4. Maintenance

Q: What type of oil is recommended?

A: The use of ISO VG 32/46/68 mineral-based hydraulic oils (HL, HLP) is recommended. HFC, HFD, HETG, and HEES fluids are also permissible, but seal material compatibility must be verified.

Q: What is the required oil cleanliness level?

A: A cleanliness level of NAS Class 9 or cleaner is mandatory, equivalent to 18/16/13 per ISO 4406. This is critical for ensuring pump life.

Q: Can I disassemble and repair the pump myself?

A: It is not recommended. While seal replacement is possible, the installation of the sliding bearings and pressure-compensated side plates requires special tools and pressure testing. For critical applications, the use of an original factory exchange cartridge or complete pump is advised.

Q: What is the expected service life of the pump?

A: Under correct operating conditions (proper oil cleanliness, appropriate viscosity, rated loads), the B10 life can reach several thousand hours. Oil contamination is the primary cause of reduced lifespan.