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Frequently Asked Questions
What does the model code "AZPF-1X-019RCB20MB" mean?
AZPF: Series code for high-pressure external gear pumps
1X: Frame size / bearing specification
019: Nominal displacement (19.0 cm³/rev)
R: Clockwise rotation
CB: Tapered shaft 1:5 with key
B20: Port and flange configuration (Square flange per ISO 8434-1)
MB: Variant code for seals and covers
Why are the pressure ratings for the 19 cm³ model lower than smaller displacements?
This is a design characteristic of the AZPF 1X series. Larger displacements (19, 22.5 cm³) have reduced pressure ratings (210 bar continuous vs. 250 bar for smaller sizes) to maintain bearing life and structural integrity under higher torque loads.
Can I get this pump in counter-clockwise rotation?
Yes. Rexroth typically offers a left-hand rotation version (denoted by an 'L' in the suffix, e.g., `...LCB...`). Always verify the rotation direction before installation.
What is the recommended operating viscosity?
Operate within 12 to 800 mm²/s. For optimal efficiency and service life, maintain viscosity between 20 and 100 mm²/s. Avoid prolonged operation below 12 mm²/s to prevent internal wear.
What is the maximum allowable speed?
The absolute maximum speed is 2500 rpm. However, the recommended continuous operating range is 1000 to 2000 rpm. Exceeding 2000 rpm may require special suction conditions (e.g., pressurized inlet) to avoid cavitation.
How do I calculate the flow output?
Use the formula:
Flow (L/min) = Displacement (19.0 cm³/rev) × Speed (rpm) / 1000
Actual flow will be slightly less due to volumetric losses (typically 90-95% efficiency).
What are common failure signs?
Watch for:
- Noise: High-pitched whining indicates cavitation (check inlet suction); knocking suggests bearing wear
- Reduced Flow: Often caused by worn gears or side plates due to contamination
- External Leakage: Usually from the shaft seal (NBR), often due to age or excessive shaft play
Can this pump be repaired in the field?
While Rexroth provides seal kits, the AZPF pump uses precision sliding bearings and pressure-compensated side plates. Replacing seals is possible, but rebuilding the internal gear set requires specialized tools and pressure testing. For critical applications, an exchange unit is often recommended.
What is the #1 cause of premature failure?
Oil contamination. This pump requires very clean oil (NAS Class 9-10). Always use a pressure filter with a beta ratio (β10) ≥ 100. Running with a clogged suction filter or low oil level can cause cavitation and catastrophic damage.
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