Product Overview
The PGH5-3X/063RE11VU2 (also designated as PGH5-31/063RE11VU2) is a large-displacement model in the Bosch Rexroth PGH-3X series gap-compensated fixed-displacement internal gear pumps, featuring a displacement of 64.7 cc/rev and belonging to Frame Size 5.
The PGH-3X series hydraulic pumps feature a gap-compensated design with constant displacement. They essentially comprise a mounting flange, housing, cover with through-drive, pinion shaft, internal gear, plain bearings, axial washers, stop pin, and radial compensation elements consisting of a segment, segment support, and seal rolls.
The pump employs a gear tooth system with involute edges and a large meshing length, delivering extremely low flow and pressure pulsation as well as low-noise operation. The pinion shaft is supported by hydrodynamically lubricated radial plain bearings, while the internal gear is hydrostatically mounted in the housing. Axial compensation is achieved through axial washers with pressure fields applied to their outer sides, balancing the washers against the displacement area for perfect sealing with low mechanical losses. Radial compensation elements automatically adjust clearance, ensuring constantly high volumetric efficiency throughout the entire operating life.
The PGH5-3X/063RE11VU2 features a cast iron housing, providing durability and robust construction for extended service life in challenging environments. The pump is optimized for variable-speed drives and is suitable for open circuit industrial and mobile hydraulic applications. Equipped with FKM seals, it is compatible with various hydraulic fluids including HLP, HEES, and HFDU. This model features clockwise rotation and supports through-drive capability for versatile multi-pump system configurations.
Engineered as a direct OEM-replacement solution for Bosch Rexroth original products, the PGH5-3X/063RE11VU2 fully complies with Rexroth original design standards and ISO/SAE mounting interface specifications, offering 100% direct interchangeability with OEM pumps. Every unit undergoes 100% workload simulation testing prior to shipment, rigorously validating pressure retention, volumetric efficiency, and internal leakage performance to meet or exceed OEM standards.
Model Code Breakdown
PGH — Series: Internal Gear Pump
5 — Frame size: Size 5 (largest frame)
3X — Component series: 3X Series
063 — Displacement code: 63 cm³/rev (actual 64.7 cc/rev)
RE — Shaft type: R = Right-hand (clockwise), E = Cylindrical shaft with key
11 — Seal and configuration code
VU2 — Seal material and special configuration code (FKM seals)
R901147115 — Rexroth material number
Technical Specifications
Model: PGH5-3X/063RE11VU2 (PGH5-31/063RE11VU2)
Rexroth Material No.: R901147115
Series: Bosch Rexroth PGH-3X Internal Gear Pump
Pump Type: Gap-compensated fixed-displacement internal gear pump
Frame Size: 5
Geometric Displacement: 64.7 cc/rev
Maximum Operating Pressure: 350 bar
Maximum Flow Rate: 189 L/min
Rated Flow (@1450 rpm, 10 bar, 30 mm²/s): 92.8 L/min
Speed Range: 200 – 3000 rpm
Rotation Direction: Clockwise (right-hand)
Shaft Type: Cylindrical shaft Ø40 mm with parallel key (ISO standard)
Mounting Flange: ISO standard flange
Housing Material: Cast iron
Seal Material: FKM (Viton)
Weight: Approx. 42 – 43 kg
Through-Drive Capability: Yes
Circuit Type: Open circuit
Compatible Fluids: HLP, HEES, HFDU and various hydraulic fluids
Recommended Oil Cleanliness: ISO 4406 20/18/15
Key Technical Advantages
1. Gap-Compensated Design – High Volumetric Efficiency Throughout Service Life
The PGH-3X series features a gap-compensated design with radial compensation elements that automatically adjust clearance. This ensures constantly high volumetric efficiency throughout the entire operating life, even at low speeds and low viscosities.
2. Extremely Low Noise & Low Pulsation Operation
The gear tooth system with involute edges and large meshing length effectively reduces flow and pressure pulsation, delivering low-noise operation. This makes it particularly suitable for noise-sensitive industrial environments.
3. Superior High-Pressure Capability
Maximum operating pressure reaches 350 bar with maximum flow of 189 L/min. The high-strength cast iron housing and precision internal gear design ensure long-term stability under high-pressure conditions. The pump is designed for fatigue-resistant drives with high power and pressure ranges, capable of withstanding numerous load cycles without compromising performance.
4. Optimized Bearing System – Low Mechanical Losses
The pinion shaft is supported by hydrodynamically lubricated radial plain bearings, while the internal gear is hydrostatically mounted in the housing. This design reduces mechanical losses and enhances pump reliability. Axial compensation through axial washers with pressure fields achieves perfect sealing with low mechanical losses.
5. Wide Speed & Wide Viscosity Adaptability
Speed range of 200 – 3000 rpm accommodates various drive conditions from low to high speeds. Thanks to the gap-compensated design, the pump maintains high efficiency even at low speeds and low viscosities. Compatible with HLP, HEES, HFDU, and various hydraulic fluids.
6. Flexible Configuration & Combination Capability
Supports through-drive capability for flexible multi-pump system configurations. All PGH series frame sizes and displacement sizes can be freely combined, and can also be combined with internal gear pumps (PGF), vane pumps, and axial piston pumps.
7. 100% Factory Tested & Direct Interchangeability
Every unit undergoes 100% workload simulation testing prior to shipment, covering pressure retention verification, internal leakage detection, and flow validation. Fully compliant with Bosch Rexroth original design standards and ISO/SAE mounting interface specifications, with flange dimensions, shaft specifications, and mounting interfaces identical to OEM pumps—direct drop-in replacement with zero modifications required.
Application Areas
The PGH5-3X/063RE11VU2 internal gear pump is widely used in the hydraulic systems of the following equipment:
Plastics Processing Machinery: Injection molding machines and plastic forming equipment
Presses: Automatic presses, forging and stamping equipment
Die Casting Machines: Casting machinery hydraulic systems
Accumulator Charging Systems: Hydraulic applications involving accumulator charging operations
Construction Machinery: Various mobile machinery hydraulic systems
Mining Machinery: Mining equipment hydraulic systems
Industrial Hydraulic Systems: Hydraulic power units for high-pressure drive applications
Expert Maintenance Tips
1. Model Confirmation
PGH5-3X/063RE11VU2 and PGH5-31/063RE11VU2 are different designations for the same product. Before installation, verify the complete model code on the pump nameplate along with the Rexroth material number (R901147115). The PGH5-3X series also includes 080 (81.4 cc/rev), 100 (100.2 cc/rev), 125 (125.3 cc/rev), 160 (162.8 cc/rev), and other displacement options.
2. Rotation Direction Confirmation
This model features clockwise (right-hand) rotation. Before installation, always verify that the PTO rotation direction of the host machine matches the pump’s rotation direction—incorrect rotation will result in pump failure to prime and may cause severe damage to internal components within a short period.
3. Installation Precautions
Thoroughly clean the ISO standard mounting flange and cylindrical shaft (Ø40 mm with parallel key) mating surfaces before installation to ensure no debris remains
Use Rexroth-specified torque values for mounting bolts—avoid over-tightening which may cause distortion of the cast iron housing
Ensure correct connection of inlet and outlet ports
Direct drive with flexible coupling is recommended—avoid subjecting the pump to axial or radial loads
The pump supports through-drive capability—if connecting additional pump stages in series, verify through-drive specifications and mounting dimensions
4. First Start-Up and Bleeding
Before first start-up, must fill the pump with hydraulic oil through the inlet port—never start dry
After start-up, run at low speed with no load for 2–3 minutes to ensure complete air evacuation from the system
Check for abnormal noise or leakage—internal gear pumps are particularly sensitive to cavitation
5. Fluid and Filtration
The pump is equipped with FKM seals and is compatible with HLP, HEES, HFDU, and various hydraulic fluids
Recommended oil cleanliness: ISO 4406 20/18/15 or better
Maintain operating temperature within recommended range
Regularly replace return line filters to prevent contaminants from entering the pump
6. Periodic Maintenance
Check mounting bolt torque every 1,000 operating hours
Regularly monitor system operating pressure—not to exceed 350 bar
The PGH series is known for long service life and low maintenance requirements—nevertheless, regularly inspect shaft seals to prevent leakage
If flow output decreases, noise levels increase abnormally, or system temperature rises excessively, inspect and replace worn components promptly
