描述

Rexroth A4FO22 A4FO28 A4FO16 Series 31 32 Axial Piston Pump A4FO28/32R-NSC12N00 Hydraulic Fixed Pump China Origin 1 Year

Technical Breakdown

Volumetric Efficiency > 95%

Thanks to precise cylinder-to-valve plate mating and hydrostatic bearing balancing, the A4FO maintains high efficiency even at low viscosities or high temperatures. A typical gear pump might drop to 85–88% under similar loads.

Pressure Capacity

Where a vane pump might max out at 210 bar, the A4FO runs daylong at 350 bar. That matters for:

Injection molding machines (holding pressure)

Marine steering gears (continuous high load)

Test benches (precise flow control)

Flanges and Shafts

ISO 3019/2 (two-hole or four-hole)

Splined shafts to ISO 14 (metric) or SAE J744

Optional tapered roller bearings for heavy radial loads (belt drive applications)

Installation Best Practices (Avoid Common Failures)

Over a decade of field data, 70% of A4FO failures trace back to three causes: cavitation, contamination, or case drain overpressure.

1.Inlet Line Must Be Oversized

The A4FO hates starvation. Because it’s fixed displacement, it tries to pull full flow even if the inlet is restricted.

Minimum inlet pressure: 0.8 bar absolute (for standard NBR seals)

Solution: Use a suction strainer, not a filter (max 100 µm). Add a vacuum gauge on inlet.

2.Case Drain Pressure

This is the most overlooked spec. The A4FO’s shaft seal fails at just 2 bar continuous case drain pressure. Yes, only 2 bar.

Always run a separate case drain line direct to tank (no backpressure).

For multi-pump stacks, the rear pump’s case drain must not pressurize the front pump.

3.Fluid Cleanliness

Target ISO 4406 18/16/13 (NAS 7–8). The A4FO has close internal clearances (~5–15 µm). Dirt causes:

Valves plate scoring → efficiency drop

Piston slipper bearing failure → metal contamination

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FAQs
1、Are you a trading company or a factory?
We are a leading manufacturer of hydraulic systems, boasting rich experience in the hydraulic industry. By strictly vetting our upstream and downstream suppliers along the industrial chain, we have built a stable and efficient supply system-allowing us to offer you hydraulic products with higher cost-effectiveness and more dependable quality.
2、Can I purchase it separately?
Yes! Our MOQ is 1 piece. If you only need one part of it instead of the entire set, we can also sell it separately. However, the maintenance period for the plastic parts of the repair kit is usually one year. It is recommended to replace all of them when replacing to avoid repeated repairs that could delay your work
3、What’s the warranty of your products?
1 year after shippment.
4、Is your company accept customization?
Yes! We accept customized product packaging, and the product will become your brand