Parker Gear Pump PGP051/PGM051

I. Basic Positioning and Core Differences

II. Core Technical Features

1. Structural Design Advantages

• Integral high-strength gray cast iron housing: Higher strength and rigidity than the 031 series, strong impact resistance and load-bearing capacity, suitable for harsh working environments such as mines, oil fields, and construction sites.
• Pressure-balanced thrust plates: Optimize volumetric efficiency, effectively reduce internal leakage, ensure stable performance under high pressure and large flow, and significantly extend the service life of the product.
• Enhanced heavy-duty roller bearings: Improved load-bearing capacity and wear resistance, strong resistance to oil contamination, reduced maintenance frequency, and adapted to long-term continuous heavy-load operation.
• High-precision hardened alloy gear and shaft: Precision machining and heat treatment process ensure high transmission accuracy, reduce wear and noise, and improve the overall stability and service life of the product under heavy-load conditions.

2. Performance Characteristics

• High pressure capacity: Continuous working pressure up to 200 bar (3000 psi), peak pressure up to 207 bar (3000 psi), suitable for heavy-duty medium and high pressure hydraulic systems.
• Large displacement and high flow: Maximum rotational speed up to 2400 rpm, displacement range of 21-105 cm³/rev, and the maximum flow rate can reach 63 gpm (238.5 L/min) at 2400 rpm, meeting the high-flow demand of heavy-duty systems.
• High efficiency: Volumetric efficiency up to 95%, reduce energy loss, improve system energy efficiency, and save operating costs for heavy-duty equipment operation.
• Rich integrated valve functions: Support relief valve with anti-cavitation check, priority flow control valve, unloading valve, dry valve, Hoc™ hydraulic overspeed control, cross relief valve and other integrated configurations to simplify system design and reduce potential leakage points.

III. Technical Parameters and Displacement Specifications

1. Displacement Range (051 Series)

2. Key Performance Parameters

IV. Configurations and Options

1. Structural Configurations

• Single pump/motor: Code “A”, independent working unit, available with integrated valve functions, suitable for single-circuit heavy-duty hydraulic systems
• Multi-unit pump/motor: Code “B”, multi-section combination realized through connecting shafts, sharing the same drive shaft to provide multiple flow/torque outputs, suitable for complex heavy-duty hydraulic systems with multiple actuators.
• Bidirectional rotation: Standard configuration, supporting clockwise/counterclockwise bidirectional operation, flexible adaptation to system layout requirements of heavy-duty equipment

2. Installation and Connection Options

• Mounting flanges: SAE A (2-bolt), SAE B (2/4-bolt), 6-bolt round Chelsea, 4-bolt special specifications, in line with international installation standards, strong load-bearing capacity
• Drive shafts: SAE A ⅝” 9-tooth spline, SAE B ⅞” 13-tooth spline, SAE B ⅞” flat key, SAE BB 1″ flat key, high precision, strong load-bearing capacity, adapted to heavy-load transmission
• Oil port specifications: SAE standard oil ports, larger caliber than the 031 series, adapting to different pipeline sizes, supporting quick connection and disassembly, ensuring smooth high-flow oil supply

3. Optional Accessories

• Built-in relief valve: With anti-cavitation check function, protecting the system from overload damage, suitable for heavy-load impact conditions
• Check valve with flow limiter: Prevent oil backflow, maintain system pressure, and control flow stably, ensuring stable operation of heavy-duty actuators
• Priority flow divider: Bolt-fixed design, realizing reasonable distribution of hydraulic flow according to system needs, adapting to multi-actuator coordinated work
• Temperature/pressure sensor interface: Facilitate system status monitoring, timely discover and solve potential faults, reducing downtime of heavy-duty equipment
• Unloading valve and accumulator inflation device: Support single-speed and dual-speed inflation, suitable for winch and ground drive systems of heavy-duty equipment
• Dry valve and Hoc™ hydraulic overspeed control: Effectively prevent equipment overspeed and improve the safety and stability of heavy-duty operation systems.
• Cross relief valve: Enhance system pressure protection, adapt to complex working conditions of heavy-duty hydraulic systems

V. Application Fields

1. Oil and gas industry: Hydraulic systems of wellhead equipment, oil and gas drilling equipment, pipeline maintenance equipment, adapting to harsh outdoor and underground working environments.
2. Mining machinery: Hydraulic power systems and actuator drives of mining excavators, loaders, and transport vehicles, with strong anti-pollution and impact resistance
3. Heavy-duty commercial vehicles: Lifting, dumping and winch systems of large trucks, trailers, and rescue vehicles, meeting high-flow and high-torque requirements
4. Material handling machinery: Hydraulic power systems and actuator drives of heavy-duty loaders, forklifts, and large conveyor equipment, ensuring stable and efficient operation
5. Agricultural and garden machinery: Auxiliary hydraulic systems of large tractors, harvesters, and lawn care equipment, adapting to outdoor complex working conditions.
6. Construction machinery: Hydraulic systems of large excavators, concrete mixers, and engineering maintenance equipment, suitable for long-term heavy-load operation

VI. Advantage Summary

1. Superior durability: Integral high-strength gray cast iron housing + enhanced heavy-duty roller bearing design, adapting to harsh working conditions such as high pressure, dust, vibration, and heavy load, significantly extending service life.
2. Large displacement and high efficiency: Pressure-balanced thrust plate technology, volumetric efficiency up to 95%, large displacement range of 21-105 cm³/rev, meeting high-flow demand of heavy-duty systems and reducing energy loss
3. Flexible configuration: Multiple displacement, installation methods, shaft ends and oil port options, rich integrated valve functions (including dry valve, Hoc™ hydraulic overspeed control), adapting to different heavy-duty system design needs.
4. Bidirectional operation: Standard bidirectional rotation capability, simplifying system layout design of heavy-duty equipment and reducing installation space
5. Strong pollution resistance: Enhanced roller bearing design has relatively low requirements on oil cleanliness, reducing maintenance costs and frequency of equipment downtime in harsh environments

VII. Notes

1. Ensure coaxiality during installation to avoid excessive radial load on the shaft end, which may cause damage to the bearing and gear, especially under heavy-load operation
2. Must fully fill with oil and exhaust air before first start-up to prevent dry friction and damage to internal components, ensuring the service life of heavy-duty parts
3. It is recommended to use hydraulic oil with a viscosity of 10-40 cSt and cleanliness meeting ISO 4406 18/15 standard to ensure stable operation of the product under heavy-load conditions
4. Regularly check oil temperature, pressure and cleanliness, and replace hydraulic oil and filters on time to extend the service life of the pump/motor and reduce maintenance costs
5. For specific technical details, integrated valve configuration and installation dimensions, please refer to the latest official Parker product manual and specification sheet.