Related Part Numbers
AZPB-22-2.0RNY02MB
AZPB-22-2.5LNM20MB
AZPB-22-2.5LNXXXMX-S0505
AZPB-22-2.5LNY02MB
AZPB-22-2.5RNM20MB
AZPB-22-2.5RNY02MB
AZPB-22-3,15LCP02MB
AZPB-22-3,15LCP20MB
AZPB-22-3,15LHO01MB
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AZPB-22-3,15LNM02MB
AZPB-22-3,15RCP02MB
AZPB-22-3,15RCP20MB
AZPB-22-3,15RHO01MB
AZPB-22-3,15RHO20MB
AZPB-22-3,15RNM02MB
AZPB-22-3.15LNM20MB
AZPB-22-3.15LNXXXMX-S0505
AZPB-22-3.15LNY02MB
AZPB-22-3.15RNM20MB
AZPB-22-3.15RNY02MB
AZPB-22-4,0LCP02MB
AZPB-22-4,0LCP20MB
AZPB-22-4,0LHO01MB
AZPB-22-4,0LHO20MB
AZPB-22-4,0LNM02MB
AZPB-22-4,0RCP02MB
AZPB-22-4,0RCP20MB
AZPB-22-4,0RHO01MB
AZPB-22-4,0RHO20MB
AZPB-22-4,0RNM02MB
AZPB-22-4,5LCP02MB
AZPB-22-4,5LCP20MB
Frequently Asked Questions
What does the model code "AZPF-1X-004RCB20KB" mean?
It decodes as follows:
- AZPF: Series code for high-pressure external gear pumps
- 1X: Frame size / bearing specification
- 004: Geometric displacement (4.0 cm³/rev)
- R: Clockwise rotation
- C: Tapered shaft 1:5
- B20: Port and flange configuration (Square flange per ISO 8434-1)
- KB: Variant code for seals and covers
Is this pump suitable for high-pressure applications?
Yes. The AZPF series is designed for heavy-duty use. This model can handle continuous pressures up to 250 bar and intermittent peaks up to 280 bar, making it ideal for industrial machinery and mobile hydraulics.
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 10 to 300 mm²/s. For optimal efficiency and service life, maintain viscosity between 20 and 100 mm²/s. Avoid prolonged operation below 10 mm²/s to prevent internal wear.
What is the minimum speed at maximum pressure?
To ensure adequate lubrication of the sliding bearings, the minimum speed should be 1200 rpm when operating at the maximum continuous pressure (250 bar). Running slower than this under high load can cause premature failure.
How do I calculate the flow output?
Use the formula:
Flow (L/min) = Displacement (4.0 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 (FKM), 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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