Parker D27AA2A 4.99 GPM SAE AA Mount 1/2" Shaft Hydraulic Gear Pump
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The Parker D27AA2A is a new, fixed-displacement hydraulic gear pump from Parker Hannifin's Hydraulic Pump and Motor Division (Monterrey), part number confirmed directly from the factory box label. Decoding the part number: "D" = gear pump series, "27" = 2.7 cc/rev (≈0.165 in³/rev) displacement, "AA" = SAE AA 2-bolt flange mount, "2" = clockwise rotation (viewed from shaft end), "A" = 1/2 in straight keyed shaft — consistent with the stated 4.99 GPM flow at rated speed and 3,000 RPM maximum input speed. The pump features a 7/8-14 UNF-2B SAE straight-thread inlet port (capped with a red plastic plug visible in photos), cast aluminum housing with an integral relief valve adjustment knob (black ball-end knob visible on the side), and is designed for use with petroleum-based hydraulic fluids in mobile and industrial applications including agricultural equipment, small power units, and machine tools requiring a compact, high-pressure gear pump. Maximum operating pressure for the D-series Parker gear pump is 3,000 PSI continuous. The 4-hole SAE AA mounting flange is clearly visible in the shaft-end photos, consistent with the "AA" designation in the part number.
Product Specifications
| Brand | Parker |
| Part Number (MPN) | D27AA2A |
| Pump Type | Fixed-Displacement Gear Pump |
| Displacement | 2.7 cc/rev (0.165 in³/rev) |
| Flow Rate | 4.99 GPM |
| Max Speed | 3,000 RPM |
| Max Continuous Pressure | 3,000 PSI |
| Mount Style | SAE AA 2-bolt flange |
| Shaft Diameter | 1/2 in, keyed |
| Inlet Port Size | 7/8-14 UNF-2B SAE straight thread |
| Rotation | Clockwise (viewed from shaft end) |
| Housing Material | Cast aluminum |
| Fluid Compatibility | Petroleum-based hydraulic oil |
| Manufacturer Division | Parker Hydraulic Pump & Motor Division |
| Condition | New |