G5-25-113S-20R | Parker Gear Pump 25cc 250bar

Product Overview

The G5 Series Hydraulic Gear Pumps are a flagship product line from Parker Hannifin (formerly Vickers brand). Parker is a global leader in motion and control technologies, and the G5 series gear pumps are renowned for their high reliability, compact construction, and consistent hydraulic performance, widely used in agricultural machinery (tractors, harvesters), construction equipment, and industrial hydraulic systems.

The G5 series features three-piece construction (front cover, center section, rear cover) with axial clearance automatic compensation and radial hydraulic balance. The series supports single, tandem, and multiple pump configurations, with a wide range of SAE and national standard flanges, shaft extensions, and port connections. The pump body is manufactured from aluminum alloy, achieving lightweight construction while maintaining structural strength.

G5-25-113S-20R model code breakdown:

• G5: Parker/Vickers G5 Series

• 25: Pump size – approx. 25 cm³/rev displacement

• 113S: Configuration code – shaft type, port specification, mounting

• 20: Pressure grade code

• R: Rotation direction – Clockwise

G5-8-1E13S-20R model code breakdown:

• G5: Parker/Vickers G5 Series

• 8: Pump size – approx. 8 cm³/rev displacement

• 1E13S: Configuration code

• 20: Pressure grade code

• R: Rotation direction – Clockwise

We specialize in the R&D and manufacturing of high-pressure pumps, motors, and valve groups. All G5 series models offer 100% direct interchangeability with original Parker/Vickers G5 series pumps of the same model—no modification required. Every unit undergoes 100% simulated load testing before shipment, ensuring performance validation under real-world operating conditions.

Technical Specifications

G5 Series General Specifications:

• Brand Series: Parker Hannifin G5 Series / Vickers

• Pump Type: External gear pump

• Construction: Three-piece construction (front cover + center section + rear cover)

• Body Material: Aluminum alloy

• Bushings: DU bearings

• Pressure Compensation: Axial clearance automatic compensation + radial hydraulic balance

• Rated Pressure: 25 MPa (250 bar / 3625 psi)

• Operating Pressure Range: 0.7 – 25 MPa

• Speed Range: 1200 – 4000 r/min

• Fluid Media: Hydraulic oil

• Operating Temperature: 0 – 120°C

• Configurations: Single, tandem, multiple pumps

Model-Specific Specifications:

G5-25-113S-20R:

• Displacement: Approx. 25 cm³/rev (25 ml/r)

• Rated Pressure: 25 MPa (250 bar)

• Speed Range: 1200 – 4000 r/min

• Rotation Direction: Clockwise (R designation)

• Body Material: Aluminum alloy

G5-8-1E13S-20R:

• Displacement: Approx. 8 cm³/rev (8 ml/r)

• Rated Pressure: 25 MPa (250 bar)

• Speed Range: 1200 – 4000 r/min

• Rotation Direction: Clockwise (R designation)

• Body Material: Aluminum alloy

• Operating Temperature: 0 – 120°C

G5-6-1E13S-20R:

• Displacement: Approx. 6 cm³/rev (6 ml/r)

• Rated Pressure: 25 MPa (250 bar)

• Speed Range: 1200 – 4000 r/min

• Rotation Direction: Clockwise (R designation)

G5-5-1E13S-20R:

• Displacement: Approx. 5 cm³/rev (5 ml/r)

• Rated Pressure: 25 MPa (250 bar)

• Speed Range: 1200 – 4000 r/min

• Rotation Direction: Clockwise (R designation)

G5-16-1F13S-20R:

• Displacement: Approx. 16 cm³/rev (16 ml/r)

• Rated Pressure: 25 MPa (250 bar)

• Speed Range: 1200 – 4000 r/min

• Rotation Direction: Clockwise (R designation)

Note: Specifications above are based on publicly available information and Parker G5 series general technical data. Different configuration codes (113S, 1E13S, 1F13S, etc.) correspond to different shaft types, flange specifications, and port configurations. Refer to the pump nameplate for exact specifications.

Key Technical Advantages

1. Axial Clearance Compensation + Radial Hydraulic Balance – High Efficiency with Long Service Life

The G5 series features axial clearance automatic compensation and radial hydraulic balance design, with a rear cover pressure plate for axial pressure compensation. This design effectively minimizes internal leakage, maintaining high volumetric and mechanical efficiency across all operating conditions. DU bearings pressed into the front and rear covers further enhance wear resistance and operational smoothness.

2. Three-Piece Aluminum Alloy Body – Lightweight with Excellent Heat Dissipation

The G5 series features three-piece construction with an aluminum alloy body. The excellent thermal conductivity of aluminum alloy aids in pump body heat dissipation, reducing oil operating temperature. The lightweight design simplifies installation and maintenance while reducing overall equipment weight.

3. High-Load DU Bearings – Withstands High-Pressure Continuous Operation

Two DU bearings are press-fitted into each of the front and rear covers. DU bearings offer excellent self-lubricating properties and wear resistance, capable of withstanding high radial loads and ensuring long-term reliable operation under 25 MPa high-pressure conditions.

4. Flexible Modular Design – Supports Multi-Pump Configurations

In addition to single pumps, the G5 series supports tandem and multiple pump configurations. Different displacement models can be flexibly combined, with a wide range of SAE and national standard flanges, shaft extensions, and port connections, providing flexible solutions for complex hydraulic systems.

5. Low-Noise Operation – Improves Operator Environment

The G5 series is renowned for low-noise operation. The low-noise characteristic significantly improves the equipment operator’s working environment, reducing fatigue during extended operation.

6. Broad Application Adaptability – Agricultural & Construction Machinery Coverage

The G5 series covers displacements from 5 to 32 cm³/rev,适配 tractors from 50 to 120 HP and harvesters. It is also widely used in construction machinery, industrial hydraulic systems, and OEM equipment—a versatile solution for both agricultural and industrial hydraulic applications.

Application Areas

• Agricultural Machinery—hydraulic lift, steering, and suspension systems for tractors (50–120 HP)

• Harvesting Machinery—header lift, reel, conveyor chain, and grain unloading hydraulic systems for combines

• Construction Machinery—hydraulic systems for cranes, dump trucks

• Industrial Hydraulic Systems—hydraulic power units, manufacturing machinery, automation equipment, press machines

• Material Handling Equipment—hydraulic systems for various warehousing and handling equipment

• Mining Equipment—hydraulic systems for mining machinery

Expert Maintenance Tips

Model Code Verification (verify each element):

G5 series model codes contain critical information. Before selection and installation, confirm the following:

• G5: Parker/Vickers G5 Series identifier.

• First digits (5/6/8/10/12/16/20/25) : Pump size – corresponds to different displacements (ml/r).

• Configuration code (e.g., 113S, 1E13S, 1F13S, etc.) : Shaft type, port specification, mounting.

• 20: Pressure grade code – corresponds to 20 MPa level (actual up to 25 MPa).

• Final letter (R/L) : Rotation direction – R indicates clockwise, L indicates counter-clockwise.

Verify Rotation Direction:

Confirm that the drive shaft rotation matches the direction code in the model – “R” indicates clockwise, “L” indicates counter-clockwise. Incorrect rotation will prevent pressure build-up and may damage internal gears and bearings.

Mounting Flange and Drive Shaft Matching:

G5 series offers a wide range of SAE and national standard flanges, shaft extensions, and port connections. Verify that the equipment-side flange type and shaft specification match the pump configuration before installation.

Suction Line and Fluid Requirements:

Use hydraulic oil meeting ISO/DIN standards. Ensure the suction line is properly sealed with no air leaks and the suction filter is not clogged. Operating oil temperature should be maintained within 0–120°C.

First-Start Priming Procedure:

After new pump installation or system overhaul, ensure the pump cavity is filled with oil before first start. Jog the pump at low speed and low pressure until the pump body is fully filled with oil and air is purged, then gradually increase to rated speed and working pressure. Running the pump dry will cause irreversible damage to gears and bearings.

Oil Cleanliness and Regular Maintenance:

Replace hydraulic oil and return filters every 1,000 operating hours or per equipment manufacturer recommendations. Using hydraulic oil with proper cleanliness will significantly extend pump service life. Regularly monitor pump body temperature—if it consistently exceeds +80°C, inspect the system cooling.

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