PGH3-2X/016RE07VU2 Bosch Rexroth Internal Gear Pump

Product Overview

The Bosch Rexroth PGH3-2X/016RE07VU2, material number R900951305, is a fixed-displacement, gap-compensated internal gear pump from the PGH series. It is a frame size BG3, nominal size NG16 pump designed for demanding industrial hydraulic applications requiring high pressure capability, low pulsation and low operating noise. Bosch Rexroth specifies a geometrical displacement of 16.0 cm³/rev for the NG16 version.

The pump uses a combination of axial and radial gap compensation to minimize internal leakage in the pressure chamber. Its hydrodynamically supported pinion shaft, hydrostatically supported internal gear and involute gear tooth system are engineered to support efficient and quiet operation across a broad operating range.

For replacement applications, the complete ordering code is critical. PGH3-2X/016RE07VU2 defines the BG3 frame, NG16 displacement class, clockwise rotation, cylindrical keyed shaft, SAE 07 connections, FKM seals and U2 mounting flange. These interfaces should be verified character by character before an in-place replacement is approved.

Technical Specifications

• Manufacturer: Bosch Rexroth
• Series: PGH
• Product Type: Fixed-displacement internal gear pump
• Complete Model: PGH3-2X/016RE07VU2
• Material Number: R900951305
• Frame Size: BG3
• Component Series: 2X
• Nominal Size: NG16
• Geometrical Displacement: 16.0 cm³/rev
• Minimum Speed: 600 rpm
• Maximum Speed: 3000 rpm
• Reference Flow: 23.0 L/min at 1450 rpm, 10 bar and 46 mm²/s
• Continuous Pressure with Mineral Oil: 315 bar
• Maximum Intermittent Pressure: 350 bar
• Intermittent Duty: Maximum 10 seconds and no more than 50% of the duty cycle
• Input Pressure: 0.8–2 bar absolute; briefly 0.6 bar during starting
• Rotation: Clockwise, viewed from the drive shaft
• Drive Shaft: Cylindrical shaft with fitting key, DIN 6885
• Line Connection: SAE flange according to ISO 6162-1
• Suction Port: DN25 / SAE 1″
• Pressure Port: DN13 / SAE 1/2″
• Seal Design: FKM
• Mounting Flange: 2-hole flange according to ISO 3019-1
• Weight: Approximately 5.3 kg
• Hydraulic Fluid Cleanliness: ISO 4406 Class 20/18/15
• Viscosity Range: 10–300 mm²/s
• Permissible Starting Viscosity: Up to 2000 mm²/s
• Mineral Oil Temperature Range: −10 to +80 °C
• Ambient Temperature Range: −20 to +60 °C

Key Technical Advantages

1. Gap Compensation for High Volumetric Efficiency

The PGH design uses axial and radial compensation elements to maintain very small sealing gaps in the pressure chamber. Pressure acting on the axial compensation system improves axial sealing, while the radial compensation mechanism minimizes leakage around the gear engagement area. This architecture supports high efficiency even at lower speeds and across a wide viscosity range.

2. Hydrodynamic and Hydrostatic Bearing Support

The pinion shaft is supported by hydrodynamically lubricated radial plain bearings, while the internal gear uses hydrostatic bearing support. This dedicated bearing arrangement is engineered to manage the mechanical loads of the rotating components and support reliable continuous operation.

3. Low Noise and Low Flow Pulsation

The pump uses an involute gear tooth system. According to the Bosch Rexroth technical description, its extended meshing length reduces flow and pressure pulsation, which directly contributes to low-noise pump operation.

4. 315 bar Continuous and 350 bar Intermittent Pressure Capability

For the NG16 configuration, the published operating pressure for mineral oil is 315 bar permanent and 350 bar intermittent. The 350 bar value is subject to a defined duty-cycle restriction and should not be treated as a continuous pressure rating.

5. Wide Speed Range for Variable-Speed Drives

The specified speed range of 600 to 3000 rpm provides flexibility for constant-speed and variable-speed drive systems. This makes the pump suitable for hydraulic power units where pump speed can be adjusted to match actual flow demand.

6. Standardized Mechanical Interfaces

The complete configuration combines a DIN 6885 keyed shaft, SAE hydraulic connections and an ISO 3019-1 mounting flange. Standardized interfaces simplify integration into hydraulic power units and replacement projects, provided the complete configuration is matched.

7. Multi-Pump Integration

Bosch Rexroth states that PGH internal gear pumps can be combined into multi-pump arrangements and lists combinations involving PGH2, PGH3 and other compatible pump families. This allows integrated power packs to supply separate hydraulic circuits from a common drive arrangement.

Application Areas

Typical applications identified in the Bosch Rexroth documentation include:

• Plastic processing machinery
• Machine tools
• Hydraulic presses
• Industrial test stands
• Hydraulic power units
• High-cycle fatigue-duty drives
• Constant-speed and variable-speed direct-drive systems
• Accumulator charging systems

The actual allowable operating pressure, speed, fluid viscosity and duty cycle must always be evaluated against the complete hydraulic system design. Applications outside the published operating parameters require engineering confirmation.

Expert Maintenance Tips

1. Verify Rotation Direction

The R designation means clockwise rotation when viewed from the drive shaft. Port orientation is related to rotation direction, so replacement pumps must not be selected purely by physical appearance.

2. Check Shaft Alignment and Coupling Condition

The pump uses a DIN 6885 keyed cylindrical shaft. Proper shaft alignment and coupling condition are essential. Excessive radial or axial shaft loads should not be introduced without engineering coordination, as Bosch Rexroth specifically identifies such loads as requiring evaluation.

3. Maintain Hydraulic Fluid Cleanliness

The specified cleanliness level is ISO 4406 Class 20/18/15. Proper filtration, tank cleanliness and flushing procedures are important for protecting gear surfaces, compensation elements and plain bearings against contamination-related wear.

4. Treat 350 bar as an Intermittent Limit

Do not design the system around 350 bar as a continuous operating pressure. Bosch Rexroth defines this value as intermittent, with a maximum duration of 10 seconds and a maximum of 50% of the duty cycle. Continuous design should respect the 315 bar permanent pressure limit.

5. Check Cold-Start Viscosity

The normal viscosity range is 10–300 mm²/s, with an allowable starting viscosity up to 2000 mm²/s. During cold starts, ensure adequate inlet conditions and avoid excessive suction pressure losses caused by highly viscous oil.

6. Match the Complete Ordering Code

For replacement projects, verify every key designation:

PGH3-2X / 016 / R / E / 07 / V / U2

The displacement class, rotation, shaft configuration, SAE connection, seal material and mounting flange all affect interchangeability. In particular, PGH3-2X/013RE07VU2 is not the same configuration as R900951305. Bosch Rexroth documentation identifies R900951304 for the 013 version and R900951305 for the 016 version.