Aluminum hydraulic gear pumps: industrial, agricultural, and mobile applications

Aluminum hydraulic gear pumps are used in hydraulic systems that need a steady flow to drive cylinders, hydraulic motors, and other components. Their compact construction and range of displacements, shafts, and mounting configurations fit industrial, agricultural, and mobile machinery.

Technical Union (TU) offers aluminum gear pumps for hydraulic applications, including SAE AA, SAE A, and SAE B mounts, with displacements matched to each system.

Gear pump applications

Gear pumps turn the mechanical energy of the drive into hydraulic energy, supplying the oil flow the circuit needs to operate its components.

Common applications include:

• Hydraulic cylinder drive: lifting, tilting, positioning, and moving loads.
• Auxiliary hydraulic systems: feeding hydraulic circuits on mobile and industrial machinery.
• Hydraulic power units: supplying flow for compact drive systems.
• Lift and load systems: operating hydraulic mechanisms on material-handling equipment.
• Hydraulic motor drive: supplying flow for rotary functions when the pump and circuit specifications are compatible.
• Intermittent-duty equipment: machinery that needs a reliable hydraulic flow source for repeated cycles.

The right pump depends on the required flow, working pressure, drive speed, and the circuit.

Industries that use aluminum gear pumps

Agriculture and farm machinery

Gear pumps are used in auxiliary circuits on farm machinery to supply flow for hydraulic functions such as lifting, tilting, and positioning implements.

Equipment that may use this type of pump, depending on the system design, includes:

• Farm tractors.
• Sprayers.
• Seeders and planters.
• Farm trailers with hydraulic functions.
• Tillage and soil-working equipment.
• Agricultural material-handling machinery.

Construction and mobile machinery

On construction equipment, gear pumps can serve auxiliary circuits and compact hydraulic systems.

Possible applications include:

• Skid steers and compact loaders.
• Backhoes and compact construction equipment.
• Aerial lifts.
• Road-maintenance equipment.
• Compaction machinery.
• Auxiliary hydraulic systems on work vehicles.

Compatibility has to be checked against each machine’s pressure, flow, and drive requirements.

Transport and commercial vehicles

Commercial-vehicle hydraulic systems can use gear pumps for certain lift, tilt, and auxiliary drive functions.

Examples include:

• Trucks with dump bodies.
• Dump trucks and unloading equipment.
• Trailers with hydraulic mechanisms.
• Loading and unloading equipment.
• Service vehicles with hydraulic accessories.

For dump or load-lifting work, confirm that the pump displacement and rated pressure suit the cylinder and the hydraulic circuit.

Industry and material handling

Aluminum gear pumps are also used in compact industrial hydraulic systems.

Applications include:

• Hydraulic lift tables.
• Material-positioning equipment.
• Clamping and pressing systems compatible with the pump.
• Hydraulic power units for industrial machinery.
• Handling and lifting equipment.
• Custom-built machinery.

SAE AA, SAE A, and SAE B aluminum gear pumps

Pump selection is not only a matter of physical size. The group, mount, shaft, and displacement have to match the installation.

SAE AA mount — Group 1

SAE AA pumps are for compact applications that need small displacements.

The options on this page include displacements of about 1.3 to 8 cm³ per revolution, with different shaft and port configurations.

SAE A mount — Group 2

SAE A pumps cover a wider displacement range for circuits that need more flow.

Available options include displacements of about 4 to 32 cm³ per revolution, depending on the configuration.

SAE B mount — Group 3

SAE B pumps are for applications that need larger displacements and flows than the smaller groups.

The published range includes displacements of about 20 to 60 cm³ per revolution, within the pressure and speed limits of each model.

Exact flow, maximum pressure, and allowable speed vary with the displacement and the pump configuration.

How to select an aluminum hydraulic gear pump

To match a pump to an existing machine or a new installation, check these points:

• Displacement: the volume of oil delivered per revolution.
• Required flow: it has to match the speed of movement the system needs.
• Working pressure: the allowable pressure has to be enough for the job.
• Drive speed: it has to stay within the limits specified for the model.
• Mount: SAE AA, SAE A, or SAE B.
• Shaft: for example, a splined shaft, a keyed shaft, or the variant specified for the model.
• Hydraulic connections: confirm the type and size of the inlet and outlet ports.
• Rotation: clockwise or counterclockwise, according to the pump configuration.
• Seals and hydraulic fluid: confirm compatibility with the oil and the operating temperature.

A poor match can cause installation problems, low flow, cavitation, or early damage.

Replacing an existing hydraulic pump

Replacing an aluminum gear pump takes more than matching the displacement or the outside appearance.

To identify a compatible alternative, it helps to provide the original pump part number, the machine manufacturer and model, photos of the nameplate or the pump body, and, when available, the hydraulic specifications.

Technical Union can review the application and determine which pump configuration should be evaluated as a replacement. Compatibility depends on the specifications and dimensions of each model.

Third-party manufacturer names and part numbers are used only as a reference to identify applications or compare specifications.

Ask about aluminum hydraulic gear pumps

Looking for a hydraulic gear pump for farm machinery, construction equipment, commercial vehicles, or industrial hydraulic systems?

Technical Union lists aluminum pumps in different mount groups, displacements, shafts, and configurations.

See our range of aluminum hydraulic gear pumps and contact us to identify an option for your application.

Send the part number, the specifications, or the equipment details so the pump can be reviewed.