GSP2-16R-A0-947-0 Rexroth Gear Pump 16.2cc

Product Overview

The Bosch Rexroth GSP2 AX is a fixed-displacement high-pressure external gear pump platform engineered for reliable hydraulic power transmission in mobile and industrial applications.

The official Bosch Rexroth catalogue lists GSP2 sizes 04, 06, 08, 12, 16 and 22, with geometric displacements from 4.5 to 22.4 cm³/rev. For Size 16, the verified displacement is 16.2 cm³/rev, with 17.5 MPa continuous pressure, 28 MPa instantaneous maximum pressure, a speed range of 500–2000 rpm, and an approximate weight of 5.5 kg.

The specific model GSP2-16R-A0-947-0 is treated here as a Size 16 GSP2 configuration. The official current coding diagram confirms that R represents clockwise rotation and A0 represents a keyed straight shaft in the standard GSP2 coding system. However, Bosch Rexroth’s currently accessible public documentation does not provide a complete character-by-character decoding of the historical 947-0 suffix, so its exact interface configuration should be verified from the original nameplate or dimensional drawing rather than inferred.

For replacement applications, true interchangeability requires more than matching displacement. Shaft geometry, rotation, mounting flange, port configuration, sealing details and overall installation dimensions must all be checked.

Technical Specifications

GSP2-16R-A0-947-0

• Manufacturer: Bosch Rexroth
• Series: GSP2
• Design Series: AX
• Pump Type: High-Pressure External Gear Pump
• Displacement Type: Fixed displacement
• Size: 16
• Geometric Displacement: 16.2 cm³/rev
• Maximum Continuous Pressure: 17.5 MPa / 175 bar
• Instantaneous Maximum Pressure: 28 MPa / 280 bar
• Minimum Speed: 500 rpm
• Maximum Speed: 2000 rpm
• Rotation Code: R = clockwise/right-hand rotation in the standard GSP2 coding system
• Drive Shaft Code: A0 = keyed straight shaft in the standard coding system
• Control: Fixed mechanical displacement; no external variable-displacement control
• Approximate Weight: 5.5 kg
• Hydraulic Fluid: Mineral hydraulic oil
• Typical Oil Grade: ISO VG 46
• Permitted Fluid Temperature: approximately -25°C to +90°C
• Permitted Viscosity Range: 10–1000 mm²/s
• Recommended Viscosity Range: 25–85 mm²/s
• Recommended Cleanliness: approximately NAS 1638 Class 10 or better with suitable filtration
• Theoretical Flow at 2000 rpm: approximately 32.4 L/min, before accounting for volumetric efficiency
• Testing: Our replacement units can undergo 100% simulated working-condition testing based on the original hydraulic system requirements.

Bosch Rexroth performance curves show that flow, efficiency and input power vary with speed and pressure, so actual system flow must be calculated from operating conditions rather than relying solely on theoretical displacement.

Key Technical Advantages

1. Pressure-Compensated Internal Clearance

The GSP2 AX uses a pressure-related gap control concept to manage internal clearances during operation. This helps reduce leakage under higher pressure and supports stable volumetric efficiency.

For an external gear pump, the relationship between gear-side clearance, pressure and leakage is critical to both hydraulic efficiency and operating temperature.

2. High-Pressure Capability

The Size 16 GSP2 is specified for 17.5 MPa continuous pressure and 28 MPa instantaneous peak pressure. The 28 MPa value must be treated as a short-duration pressure limit rather than a continuous operating rating.

3. Precision Gear-and-Plate Assembly

Gear pump efficiency depends strongly on gear geometry, axial clearance, side-plate behavior and housing precision. The GSP2 internal architecture incorporates gears, side plates, bearings and pressure-related compensation elements to control leakage and mechanical losses.

4. Robust Bearing Support

The gear train generates both radial and hydraulic loading. Proper internal bearing support helps maintain shaft alignment and manage these mechanical loads, contributing to long-term durability under cyclic hydraulic duty.

5. Single and Tandem Pump Configurations

The GSP2 AX platform supports both single-pump and double-pump arrangements. Tandem configurations can supply multiple hydraulic circuits, but the combined drive torque must be evaluated according to individual pressure and displacement requirements.

6. Useful Speed Range

The verified Size 16 speed range is 500–2000 rpm. Increasing speed raises theoretical flow but also increases power demand and inlet requirements. Correct suction-line sizing and hydraulic-fluid viscosity are therefore essential for reliable high-speed operation.

Application Areas

Typical applications for GSP2-16R-A0-947-0 include:

• Construction machinery auxiliary hydraulic circuits
• Excavator pilot or auxiliary hydraulic systems
• Mobile hydraulic power units
• Industrial hydraulic power packs
• Material-handling machinery
• Hydraulic lubrication and auxiliary oil circuits
• Tandem-pump hydraulic assemblies
• Rexroth GSP2 replacement and retrofit projects

With a 16.2 cm³/rev displacement, the Size 16 configuration is suitable for compact hydraulic systems requiring approximately 30 L/min theoretical flow at 2000 rpm. Actual delivered flow depends on operating speed and volumetric efficiency.

Expert Maintenance Tips

1. Prime the Pump Before Full-Load Operation

After installation, ensure that the suction circuit and pump chamber are properly filled with hydraulic fluid. Initial commissioning should be carried out at low pressure and controlled speed to remove trapped air and establish lubrication.

2. Verify Rotation Carefully

In the standard GSP2 coding system, R indicates clockwise rotation while L indicates counterclockwise rotation. Rotation direction is directly related to suction and discharge port orientation.

3. Protect the Drive Shaft

Avoid excessive radial or axial forces caused by poor coupling alignment. Incorrect shaft alignment can accelerate bearing and shaft-seal wear and may significantly shorten service life.

4. Keep Suction Resistance Low

Use short, properly sized suction lines and minimize unnecessary elbows and restrictions. A clogged filter, undersized suction line or excessive oil viscosity can cause cavitation, noise and loss of volumetric efficiency.

5. Control Hydraulic-Fluid Cleanliness

Contaminated oil can damage gear tooth surfaces, side plates and bearing interfaces. Maintaining the recommended cleanliness level and using appropriate filtration are important for preserving hydraulic efficiency and service life.

6. Distinguish Continuous and Peak Pressure

For Size 16:

• 17.5 MPa / 175 bar: maximum continuous pressure
• 28 MPa / 280 bar: instantaneous maximum pressure

The peak-pressure value must never be treated as a continuous operating rating.

7. Verify Interchangeability Before Installation

For a replacement GSP2-16R-A0-947-0, verify:

• 16.2 cm³/rev displacement
• Clockwise rotation
• Shaft configuration
• Mounting flange
• Suction and discharge ports
• Port orientation
• Shaft extension
• Seal configuration
• Overall installation length

The historical 947-0 suffix is not fully decoded in the currently accessible public Bosch Rexroth GSP2 documentation. The safest engineering practice is therefore to verify the original pump nameplate, dimensional drawing or physical interface before claiming direct interchangeability.