Bosch Rexroth AA10VG28 variable displacement hydraulic pump

At the heart of the AA10VG28 is a swashplate design. By tilting the angle of the swashplate, the pump changes the stroke length of its nine pistons. This means flow rate can be varied from near zero to maximum—without changing engine speed. For example, if your excavator needs less oil during a light grading pass, the pump reduces output automatically. That translates directly into lower fuel consumption and less wear on seals and hoses.

Where You’ll Find This Pump in Action

Construction Equipment

Take a mini-excavator as an example. During digging, the pump delivers high flow to the boom and arm cylinders. When the operator pauses to reposition, the controller signals the pump to drop to standby flow—often below 5 L/min. This cycle repeats hundreds of times per shift. The AA10VG28’s fast response time (typically under 100 ms) keeps the machine responsive without wasting energy.

Agricultural Machinery

In a self-propelled sprayer, the pump powers both wheel drive and implement functions. Because field conditions change constantly—from soft soil to hardpan—the pump must adapt instantly. The integrated pressure compensator prevents overloading the engine, while the load-sensing port allows the system to match flow to demand with precision.

Material Handling

Forklifts and telehandlers benefit from the pump’s low noise level. At 1,800 rpm and 200 bar, sound emissions are around 72 dB(A)—quiet enough for indoor warehouse use without requiring additional sound-dampening enclosures.

Common Failure Modes and How to Avoid Them

Even a well-engineered pump can fail prematurely if the supporting system isn’t right. Here are three issues I’ve seen most often in the field:

Contamination Damage

The AA10VG28 uses extremely tight clearances between the cylinder block and valve plate—on the order of 5–15 microns. If even fine silt passes through a clogged filter, scoring occurs rapidly. Always use a return-line filter with a β10 ≥ 200 rating and replace it at intervals specified by the OEM.

Cavitation from Low Inlet Pressure

Because the pump can pull up to 0.8 bar absolute vacuum at the inlet, any restriction—a collapsed suction hose, a cold-viscosity oil, or a plugged strainer—can cause cavitation. The result is pitting on the pistons and a characteristic “gravelly” noise. Ensure the suction line is at least one size larger than the pump inlet port and keep oil temperature above 20°C before heavy operation.

Swashplate Bearing Wear

The swashplate bearing supports the entire reaction force of the pistons. Over long periods of continuous high-pressure operation (above 250 bar), the bearing can develop fatigue spalling. Using a premium hydraulic oil with anti-wear additives (like ISO VG 46) and keeping contamination levels below NAS 1638 Class 9 will extend bearing life significantly.

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Specifications

Selection Table

Q1: What is the recommended oil viscosity range?

A1: For most climates, ISO VG 32 or 46 works well. Minimum startup viscosity should not exceed 860 mm²/s; maximum operating viscosity should stay below 16 mm²/s. Check the Rexroth data sheet for exact limits based on your ambient temperature range.

Q2: How do I test the pump’s efficiency in the field?

A2: Measure flow at two different pressures using a flow meter and a pressure gauge. Compare actual flow to theoretical flow (displacement × rpm). Efficiency drops below 90% volumetric typically indicate internal leakage past the pistons or valve plate—time for a rebuild.

Q3:How to purchase an AA10VG28 hydraulic pump?

A3:You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.

Q4:What is the price and delivery time of the AA10VG28 hydraulic pump?

A4: The specific price and delivery time will be provided based on the model you specify.