HY160MY-RP HY300Y-RP Hengyuan HY Axial Piston Pump 315bar

Product Overview

The HY160MY-RP, HY140MY-RP, and HY300Y-RP are core models within the Hengyuan (HENGYUAN) HY series of open-circuit swash plate axial piston pumps. The HY series is Hengyuan Hydraulic’s upgraded flagship model built on the CY pump platform, featuring a swash plate design with displacements ranging from 10 to 320 ml/r, a nominal pressure of 315 bar, and peak pressure of 400 bar, designed for open-circuit hydrostatic drive systems.

HY Series Core Features: Swash plate design axial variable piston pump for open circuit; continuous working pressure can reach 315 bar, and the highest instantaneous working pressure can reach 400 bar; various displacements, high power density; new appearance, small volume, high power weight ratio; many variable forms, various energy-saving control codes and fast control response speed; low noise level, high efficiency and high reliability; excellent oil absorbency; integrated design for pump body and pump shell and cancel the dial; the same mounting flange with CY pump and design for SAE oil flange.

Model Code Breakdown (for procurement and engineering reference):

Using HY 160 M Y – R P as example:

• HY: Hengyuan brand HY series swash plate axial piston pump

• 160: Nominal size, geometric displacement 160 ml/r

• M / Y / MY: Control type. M = Fix displacement control; Y = Constant power control; MY = Grading variables control; P = Pressure control; P01 = Energy-saving pressure control; P02 = Remote pressure control; P03 = Pressure and flow control (load sensing); P04 = High and low voltage compensation control; B = Electro hydraulic; S = Manual control

• -R / -L: Direction of rotation (viewed from shaft end). R = Clockwise, L = Anti-clockwise

• P / LP: Shaft end type. P = Metric parallel with key; LP = Low pressure type (RP indicates higher pressure rating, such as 31.5MPa or higher)

Covered Model Configuration Analysis:

• HY160MY-RP: 160 ml/r, MY grading variables control, clockwise rotation, metric keyed shaft, high-pressure type

• HY140MY-RP: 140 ml/r, MY grading variables control, clockwise rotation, metric keyed shaft, high-pressure type

• HY300Y-RP: 300 ml/r, Y constant power control, clockwise rotation, metric keyed shaft, high-pressure type

Drop-in Replacement Advantage: Manufactured to exact HY series standards, these pumps achieve complete drop-in interchangeability with the original CY pump specification for mounting flange, SAE universal oil port flange, shaft dimensions, and rotation direction. The HY series can directly replace CY14-1B series piston pumps with identical mounting dimensions. Every pump undergoes 100% simulated load testing prior to shipment, validating 315 bar pressure loading, variable control response, and volumetric efficiency under conditions replicating real-world duty cycles.

Technical Specifications (Bulleted List)

Model HY160MY-RP:

• Model Code: HY160MY-RP

• Series: Hengyuan HY Series (Open Circuit, Swash Plate Design)

• Nominal Displacement: 160 ml/r

• Rated Pressure: 315 bar (continuous)

• Peak Pressure: 400 bar (instantaneous)

• Clearance Working Pressure (10% cycle): 350 bar

• Maximum Speed: 1500 r/min

• Maximum Flow (1500 r/min): 240 L/min

• Maximum Power (315 bar, 1500 r/min): 126 kW

• Maximum Torque (315 bar): 802 N·m

• Control Type: MY — Grading Variables Control

• Rotation: Clockwise (viewed from shaft end)

• Shaft: Metric parallel with key (P)

• Mounting Flange: Same as CY pump

• Port Flange: SAE universal design

• Housing Material: High-strength cast iron

• Inlet Absolute Pressure Range: 0.8–30 bar

• Case Drain Pressure: Max 0.5 bar higher than inlet, not exceeding 2 bar absolute

• Operating Temperature: 15–65°C (optimum 50±4°C)

• Recommended Fluid: L-HM32/46/68 low pour point high pressure anti-wear hydraulic oil

• Fluid Cleanliness: NAS Grade 10 (or ISO 19/16) or better

• Weight: Approx. 128 kg

Model HY140MY-RP:

• Model Code: HY140MY-RP

• Series: Hengyuan HY Series (Open Circuit, Swash Plate Design)

• Nominal Displacement: 140 ml/r

• Rated Pressure: 315 bar (continuous)

• Peak Pressure: 400 bar (instantaneous)

• Maximum Speed: 1500 r/min

• Maximum Flow (1500 r/min): 210 L/min

• Maximum Power (315 bar, 1500 r/min): 110 kW

• Maximum Torque (315 bar): 701 N·m

• Control Type: MY — Grading Variables Control

• Rotation: Clockwise (viewed from shaft end)

• Shaft: Metric parallel with key (P)

• Housing Material: High-strength cast iron

• Fluid Cleanliness: NAS Grade 10 (or ISO 19/16) or better

• Weight: Approx. 110 kg

Model HY300Y-RP:

• Model Code: HY300Y-RP

• Series: Hengyuan HY Series (Open Circuit, Swash Plate Design)

• Nominal Displacement: 300 ml/r

• Rated Pressure: 315 bar (continuous)

• Peak Pressure: 400 bar (instantaneous)

• Maximum Speed: 1500 r/min

• Maximum Flow (1500 r/min): 450 L/min

• Maximum Power (315 bar, 1500 r/min): 236.3 kW

• Maximum Torque (315 bar): 1504 N·m

• Control Type: Y — Constant Power Control

• Rotation: Clockwise (viewed from shaft end)

• Shaft: Metric parallel with key (P)

• Housing Material: High-strength cast iron

• Fluid Cleanliness: NAS Grade 10 (or ISO 19/16) or better

• Weight: Approx. 220 kg

HY Series Complete Displacement Size Reference:

• HY10: 10 ml/r, max flow 15 L/min, max power 7.9 kW, max torque 50 N·m

• HY16: 16 ml/r, max flow 24 L/min, max power 13 kW, max torque 80 N·m

• HY25: 25 ml/r, max flow 37.5 L/min, max power 19.7 kW, max torque 125 N·m

• HY40: 40 ml/r, max flow 60 L/min, max power 31.5 kW, max torque 200 N·m

• HY63: 63 ml/r, max flow 94.5 L/min, max power 49.6 kW, max torque 316 N·m

• HY80: 80 ml/r, max flow 120 L/min, max power 63 kW, max torque 401 N·m

• HY107: 107 ml/r, max flow 160.5 L/min, max power 84.3 kW, max torque 536 N·m

• HY125: 125 ml/r, max flow 187.5 L/min, max power 98.4 kW, max torque 626 N·m

• HY140: 140 ml/r, max flow 210 L/min, max power 110 kW, max torque 701 N·m

• HY160: 160 ml/r, max flow 240 L/min, max power 126 kW, max torque 802 N·m

• HY200: 200 ml/r, max flow 300 L/min, max power 157.5 kW, max torque 1003 N·m

• HY250: 250 ml/r, max flow 375 L/min, max power 196.9 kW, max torque 1253 N·m

• HY300: 300 ml/r, max flow 450 L/min, max power 236.3 kW, max torque 1504 N·m

• HY320: 320 ml/r, max flow 480 L/min, max power 252 kW, max torque 1605 N·m

Key Technical Advantages

1. Swash Plate Design with Hydrostatic Film Lubrication Bearing and High Power Density
The HY series employs a swash plate axial piston rotary group design where pistons and cylinder bores are precision match-ground to micron-level clearances. Hydrostatic film lubrication of bearing enables the rotary group to maintain stable fluid-film lubrication at high speeds, dramatically reducing friction loss. The 160 cc size delivers maximum power of 126 kW at 315 bar rated pressure, and the 300 cc size delivers 236.3 kW, leading its displacement class in power density.

2. Versatile Energy-Saving Control Options with Fast Response
The HY series offers a rich selection of control options: M (fixed displacement), Y (constant power control), MY (grading variables control), P (pressure control), P01 (energy-saving pressure control), P02 (remote pressure control), P03 (pressure and flow control — load sensing), P04 (high and low voltage compensation control), B (electro hydraulic), and S (manual control). The MY grading variables control automatically adjusts displacement in multiple preset power stages based on load demand. The Y constant power control ensures pump input power never exceeds the setpoint under variable load conditions, achieving precise matching between hydraulic system power and prime mover output power. Fast control response enables rapid displacement adjustment under load transients.

3. Integrated Pump Body and Housing Design with CY Pump Interchangeability
The HY series features an integrated pump body and housing design that eliminates the traditional dial, resulting in a more compact and streamlined structure. The mounting flange is identical to the CY14-1B series pump, enabling direct drop-in replacement. The SAE universal oil port flange design further enhances piping connection compatibility. This design allows HY series pumps to directly replace existing CY series pumps without modifying mounting foundations or piping systems.

4. Low Noise, High Efficiency, High Reliability
The HY series employs a seven-piston structure with optimized port plate design, delivering smooth output flow with minimal pressure pulsation. The housing is precision-cast from high-strength cast iron, with the material’s damping characteristics effectively suppressing structural vibration and fluid-borne noise. The use of hydrostatic film lubrication bearings enables friction pairs to operate under pure liquid friction, significantly improving mechanical efficiency.

5. Wide Displacement Range with Flexible Selection
The HY series covers displacements from 10 to 320 ml/r across 25 specifications, spanning the full range of hydraulic power requirements from small machine tools to large forging presses. Different displacement sizes share the same control module interface and mounting flange standards, providing maximum flexibility for system design and upgrade.

6. Excellent Self-Priming Performance with Wide Hydraulic Fluid Compatibility
The HY series delivers excellent self-priming performance, with optimized suction flow passages reducing cavitation risk and aeration damage. Recommended fluids are L-HM32, 46, 68 low pour point high pressure anti-wear hydraulic oils, with normal operating oil temperature of 15–65°C, optimum 50±4°C, and kinematic viscosity of 27–43 mm²/s.

Application Areas

• Forging Equipment: Various oil presses and hydraulic press main pumps (one of the core application areas of the HY series)

• Machine Tools: CNC machine hydraulic systems, hydraulic fixtures, precision grinder hydraulic power sources

• Metallurgical Equipment: Rolling mill hydraulic systems, smelting equipment hydraulic power sources

• Mining Machinery: Mine hoist hydraulic systems, crusher hydraulic drives

• Marine & Offshore: Ship deck machinery hydraulic drives, steering gear hydraulic systems

• Construction Machinery: Construction machinery hydraulic systems, hydraulic motor applications

• Die-Casting & Forging: Die-casting machine clamp hydraulic systems, forging equipment hydraulic power sources

• General Industrial Hydraulic Power Units: Small to medium hydraulic power units, central oil supply systems

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness
HY series pumps are sensitive to fluid contamination, and cleanliness significantly affects pump service life. System fluid cleanliness must be controlled within NAS Grade 10 (or ISO 19/16). Recommended fluids are L-HM32/46/68 low pour point high pressure anti-wear hydraulic oils, selected according to ambient temperature variations: higher grades for higher ambient/oil temperatures, lower grades for lower ambient/oil temperatures. Install a 10 μm absolute-rated filter element at the pump inlet. Replace elements at 500 hours after first commissioning, then every 1,000 operating hours or 6 months, whichever comes first.

2. Operating Temperature and Viscosity Control
The HY series normal operating oil temperature is 15–65°C, with optimum at 50±4°C and kinematic viscosity of 27–43 mm²/s. Ensure oil kinematic viscosity is not below 27 mm²/s at 65°C and not above 43 mm²/s at 15°C. Cold-start self-priming vacuum due to high oil viscosity should not exceed 0.016 MPa. For continuous high-temperature applications, install an oil cooler.

3. Pre-Start Priming and Air Bleeding
Before first start, fill the pump housing with clean hydraulic fluid. After installation, turn the coupling by hand 3–5 revolutions to expel air from the pump. Start at low speed with zero load and run for 5–10 minutes. Verify continuous bubble-free flow from the case drain. Only then apply load. Ensure inlet absolute pressure is maintained between 0.8 and 30 bar.

4. Case Drain Line Requirements
The maximum permissible pressure of the oil drain port is 0.5 bar higher than inlet pressure, but must not exceed 2 bar absolute pressure. The drain outlet must terminate below oil level at all times to prevent air ingestion. The drain line diameter must not be smaller than the pump case drain port size. Never tie the drain line into the main system return line.

5. MY Grading Variables Control Commissioning
The HY160MY-RP and HY140MY-RP employ MY grading variables control, which adjusts displacement in stages based on load demand. During commissioning, first confirm that each power stage setting meets prime mover characteristics, then set each stage trigger pressure with the pump at neutral (zero displacement). Adjust only with the system at zero load. Rotate the adjustment screw slowly and verify stable pressure gauge readings before proceeding.

6. HY300Y-RP Constant Power Controller Setting
The HY300Y-RP employs Y constant power control with mechanically adjustable power control curve start point. During commissioning, first determine the power control curve start point based on the prime mover’s power characteristics, then set the system pressure control value. Mechanical adjustment of the power control start point should be performed with the pump at neutral (zero displacement). The power control setting must ensure that the system does not exceed the prime mover’s available power at maximum working pressure.