The Parker DENISON Goldcup hydraulic pump is a high-performance variable displacement axial piston pump specifically designed and optimized for road roller applications. Integrating advanced hydrostatic transmission technology and rugged structural design, it provides stable, efficient and reliable power output for various types of hydraulic road rollers, effectively adapting to the harsh working conditions such as high load, continuous operation and complex road surface conditions in road roller operations.

1. Core Features

• Rocker Cam and Cradle Assembly: It adopts a hydrostatically balanced rocker cam and cradle structure, which realizes smooth variable displacement without relying on roller bearings or trunnions, thereby reducing noise emission and mechanical wear to the greatest extent. The unique design ensures the lowest noise level and hysteresis in the industry, and improves the stability of the pump during long-term continuous operation of the road roller.
• Exclusive Servo Control System: Equipped with a high-precision rotary servo control system, it can instantly respond to input commands and compensate for system pressure changes. The compact vane chamber design reduces the volume of trapped control fluid, ensuring stable control performance. The servo stem is controlled by an external signal with an adjustable angle range of +19° to -19°, which can accurately control the pump displacement and match the different power demands of the road roller during compaction and walking processes.
• Servo Pressure Control: The servo pressure is precisely regulated by the servo relief valve, and the replenishing oil is first supplied to the servo system to ensure the reliability of the control system. The pressure modulating pin realizes the synchronous increase of servo pressure with system pressure (40 psi/2.8 bar servo pressure increase per 1000 psi/69 bar system pressure increase), which improves the adaptive capacity of the pump under variable load conditions of road rollers.
• Rugged and Durable Structure: All internal wear surfaces adopt hydrostatic balance or hydraulic linkage design, which prolongs the service life of the pump. The modular control and quick-change valve block design facilitates on-site maintenance and replacement without disassembling the entire transmission system, which is suitable for the emergency maintenance needs of road roller construction sites.
• Strong Environmental Adaptability: It is equipped with high-pressure mechanical shaft seals (double lip seals optional), which have excellent sealing performance and can effectively prevent the intrusion of dust, gravel and other impurities in road roller operations. The pump can work stably in harsh environments such as high temperature, humidity and strong vibration, ensuring the continuous operation of the road roller.

2. Key Technical Parameters

3. Application Adaptability for Road Rollers

The Parker DENISON Goldcup hydraulic pump is widely applicable to various types of hydraulic road rollers, including static road rollers, vibratory road rollers and pneumatic tire road rollers. It provides stable power support for the compaction mechanism, walking mechanism and steering mechanism of the road roller, and its excellent pressure and flow regulation performance can realize the stepless adjustment of the road roller’s compaction force and speed, adapting to different road types (asphalt road, cement road, gravel road) and compaction requirements (different compactness standards for different road materials).

In addition, the pump has the function of bidirectional flow control, which can quickly switch the compaction speed and working mode of the road roller, improve the construction efficiency. The integrated auxiliary pump design can provide power for the control system and lubrication system of the road roller, realizing the integration of power supply and simplifying the hydraulic system structure of the equipment.

4. Installation and Maintenance Notes

• Before installation, check whether the pump model, displacement and pressure rating match the road roller’s hydraulic system requirements, and ensure that the pump is free from damage during transportation.
• The hydraulic system pipeline must be thoroughly cleaned before installation to prevent debris from entering the pump and causing wear or failure of internal components. The inlet and outlet pipelines should be connected firmly to avoid oil leakage under high pressure.
• Fill the hydraulic oil tank with clean hydraulic oil that meets the specifications, and ensure that the oil viscosity is suitable for the working environment temperature. Regularly replace the hydraulic oil and oil filter (recommended replacement cycle: 2000 working hours) to maintain the cleanliness of the oil liquid.
• During daily operation, regularly check the pump’s operating temperature, noise and oil leakage. If abnormal phenomena are found, stop the machine immediately for inspection to avoid further damage to the pump and affect the normal operation of the road roller.
• When replacing wearing parts, use genuine Parker DENISON accessories to ensure the matching performance and service life of the pump. The disassembly and assembly of the pump should be carried out by professional technicians in accordance with the maintenance manual.

5. Safety Precautions

• Do not disassemble or adjust the pump when the hydraulic system is under pressure to avoid high-pressure oil jetting and causing personal injury.
• During maintenance, cut off the power supply of the road roller and release the pressure of the hydraulic system first to ensure the safety of the operation.
• It is strictly prohibited to overload the pump beyond the rated pressure and speed to prevent premature failure of the pump and affect the normal operation of the road roller.
• Operators must be trained professionally and familiar with the working principle and operation specifications of the pump before operating the road roller.

As a core component of the road roller’s hydraulic system, the Parker DENISON Goldcup hydraulic pump has been verified by a large number of engineering practices, with excellent performance, high reliability and long service life, which can effectively improve the compaction efficiency and operation stability of the road roller, and reduce the maintenance cost and downtime.