YCY14-1B 25YCY14-1B CY14-1B Axial Piston Pump 31.5MPa

Product Overview

The YCY14-1B series of constant power variable axial piston pumps (including 10YCY14-1B, 25YCY14-1B, 40YCY14-1B, 63YCY14-1B, 80YCY14-1B, 160YCY14-1B, 250YCY14-1B, and 400YCY14-1B) is the core product line within the CY14-1B series of axial piston pumps, belonging to the swash plate pressure-compensated variable pump category. The series employs the classic port plate and rotating cylinder block axial piston pump design, with a nominal pressure of 31.5 MPa, maximum pressure of 35 MPa, peak pressure of 40 MPa, and displacement range from 10 to 400 ml/r.

Core Structural Features: The drive shaft is spline-connected to the cylinder block, driving the block to rotate, causing seven evenly distributed plungers on the cylinder body to rotate around the centerline of the transmission shaft. Each plunger end has a sliding shoe, and the central spring presses the sliding shoes against the swash plate through the inner sleeve steel ball and return plate. As the cylinder block rotates, the plungers simultaneously reciprocate, completing oil suction and pressure actions.

Key Manufacturing Process: Hydrostatic pressure balance structures are employed between the sliding shoes and the variable head, and between the port plate and the cylinder block, so that these two pairs of motion surfaces operate under pure liquid friction, eliminating the need for heavy-duty thrust bearings. Compared to other pump types, this design offers simple structure, compact size, high efficiency, long service life, light weight, and strong self-priming capability. The pump can also be used as a hydraulic motor by simply replacing the motor port plate.

Drop-in Replacement Advantage: Manufactured to exact CY14-1B series standards, these pumps achieve complete drop-in interchangeability for mounting flange dimensions, shaft dimensions, port layout, and rotation direction. Every pump undergoes 100% simulated load testing prior to shipment, validating 31.5 MPa pressure loading, constant power variable control response, and volumetric efficiency under conditions replicating real-world duty cycles.

Technical Specifications 

Model 10YCY14-1B:

• Model Code: 10YCY14-1B

• Series: CY14-1B (YCY Constant Power Variable)

• Nominal Displacement: 10 ml/r

• Rated Pressure: 31.5 MPa

• Maximum Pressure: 35 MPa

• Peak Pressure: 40 MPa

• Rated Speed: 1000 r/min

• Maximum Speed: 2000 r/min

• Minimum Speed: 500 r/min

• Theoretical Flow (1000 r/min): 10 L/min

• Theoretical Flow (1500 r/min): 15 L/min

• Maximum Transmission Power (1000 r/min): 5.7 kW

• Maximum Theoretical Torque: 54.6 N·m

• Number of Pistons: 7

• Weight: Approx. 12 kg

• Mounting Dimensions: L=253 mm, h1=71 mm, shaft Φ25 mm

• Port Threads: Inlet M33×2, Outlet M14×1.5

Model 25YCY14-1B:

• Model Code: 25YCY14-1B

• Series: CY14-1B (YCY Constant Power Variable)

• Nominal Displacement: 25 ml/r

• Rated Pressure: 31.5 MPa

• Maximum Pressure: 35 MPa

• Peak Pressure: 40 MPa

• Rated Speed: 1000 r/min

• Maximum Speed: 2000 r/min

• Theoretical Flow (1000 r/min): 25 L/min

• Theoretical Flow (1500 r/min): 37.5 L/min

• Maximum Transmission Power: 14.1 kW

• Maximum Theoretical Torque: 134.9 N·m

• Number of Pistons: 7

• Weight: 28.4–41 kg (per configuration)

• Mounting Dimensions: L=308 mm, h1=83 mm, shaft Φ30 mm

• Port Threads: Inlet M33×2

Model 40YCY14-1B:

• Model Code: 40YCY14-1B

• Series: CY14-1B (YCY Constant Power Variable)

• Nominal Displacement: 40 ml/r

• Rated Pressure: 31.5 MPa

• Maximum Pressure: 35 MPa

• Peak Pressure: 40 MPa

• Rated Speed: 1000 r/min

• Theoretical Flow (1000 r/min): 40 L/min

• Theoretical Flow (1500 r/min): 60 L/min

• Maximum Transmission Power: 22.6 kW

• Maximum Theoretical Torque: 201.5 N·m

• Weight: Approx. 40 kg

• Mounting Dimensions: L=308 mm, h1=83 mm, shaft Φ30 mm

Model 63YCY14-1B:

• Model Code: 63YCY14-1B

• Series: CY14-1B (YCY Constant Power Variable)

• Nominal Displacement: 63 ml/r

• Rated Pressure: 31.5 MPa

• Maximum Pressure: 35 MPa

• Peak Pressure: 40 MPa

• Rated Speed: 1500 r/min

• Theoretical Flow (1000 r/min): 63 L/min

• Theoretical Flow (1500 r/min): 94.5 L/min

• Maximum Transmission Power: 35.8 kW

• Maximum Theoretical Torque: 339.9 N·m

• Weight: 56–74 kg (per configuration)

• Mounting Dimensions: L=385 mm, h1=108 mm, shaft Φ40 mm

• Port Threads: Inlet M42×2

Model 80YCY14-1B:

• Model Code: 80YCY14-1B

• Series: CY14-1B (YCY Constant Power Variable)

• Nominal Displacement: 80 ml/r

• Rated Pressure: 31.5 MPa

• Maximum Pressure: 35 MPa

• Peak Pressure: 40 MPa

• Rated Speed: 1500 r/min

• Theoretical Flow (1000 r/min): 80 L/min

• Theoretical Flow (1500 r/min): 120 L/min

• Maximum Transmission Power: 46.6 kW

• Maximum Theoretical Torque: 405.1 N·m

• Weight: Approx. 65 kg

• Mounting Dimensions: L=385 mm, h1=108 mm, shaft Φ40 mm

Model 160YCY14-1B:

• Model Code: 160YCY14-1B

• Series: CY14-1B (YCY Constant Power Variable)

• Nominal Displacement: 160 ml/r

• Rated Pressure: 31.5 MPa

• Maximum Pressure: 35 MPa

• Peak Pressure: 40 MPa

• Rated Speed: 1000 r/min

• Theoretical Flow (1000 r/min): 160 L/min

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

• Maximum Transmission Power: 92.2 kW

• Maximum Theoretical Torque: 880.3 N·m

• Weight: Approx. 128 kg

• Mounting Dimensions: L=525 mm, h1=141 mm, shaft Φ55 mm

• Port Threads: Inlet M22×1.5

Model 250YCY14-1B:

• Model Code: 250YCY14-1B

• Series: CY14-1B (YCY Constant Power Variable)

• Nominal Displacement: 250 ml/r

• Rated Pressure: 31.5 MPa

• Maximum Pressure: 35 MPa

• Peak Pressure: 40 MPa

• Rated Speed: 1000 r/min

• Theoretical Flow (1000 r/min): 250 L/min

• Theoretical Flow (1500 r/min): 375 L/min

• Maximum Transmission Power: 133.2 kW

• Maximum Theoretical Torque: 1272.4 N·m

• Weight: 200–232 kg (per configuration)

Model 400YCY14-1B:

• Model Code: 400YCY14-1B

• Series: CY14-1B (YCY Constant Power Variable)

• Nominal Displacement: 400 ml/r

• Rated Pressure: 31.5 MPa

• Maximum Pressure: 35 MPa

• Peak Pressure: 40 MPa

• Rated Speed: 1000 r/min

• Theoretical Flow (1000 r/min): 400 L/min

• Theoretical Flow (1500 r/min): 600 L/min

• Maximum Transmission Power: 199.5 kW

• Maximum Theoretical Torque: 1905.2 N·m

• Weight: 200–232 kg (per configuration)

CY14-1B Series Displacement Size Reference:

• 1.25YCY14-1B: 1.25 ml/r, weight approx. 6.9 kg

• 2.5YCY14-1B: 2.5 ml/r, weight approx. 7.2 kg

• 10YCY14-1B: 10 ml/r, weight approx. 12–26 kg

• 13YCY14-1B: 13 ml/r, weight approx. 16.4–26 kg

• 16YCY14-1B: 16 ml/r, weight approx. 16.4–26 kg

• 25YCY14-1B: 25 ml/r, weight approx. 28.4–41 kg

• 32YCY14-1B: 32 ml/r, weight approx. 28.4–41 kg

• 40YCY14-1B: 40 ml/r, weight approx. 28.4–41 kg

• 63YCY14-1B: 63 ml/r, weight approx. 56–74 kg

• 80YCY14-1B: 80 ml/r, weight approx. 56–74 kg

• 100YCY14-1B: 100 ml/r, weight approx. 80–110 kg

• 160YCY14-1B: 160 ml/r, weight approx. 138–168 kg

• 250YCY14-1B: 250 ml/r, weight approx. 200–232 kg

• 400YCY14-1B: 400 ml/r, weight approx. 200–232 kg

Key Technical Advantages

1. Hydrostatic Pressure Balance Structure with High Volumetric Efficiency
The core technical advantage of the YCY14-1B series lies in the hydrostatic pressure balance structures between the sliding shoes and the variable head, and between the port plate and the cylinder block. The hydrostatic pressure balance oil film thickness design enables these two pairs of motion surfaces to operate under pure liquid friction, eliminating the need for heavy-duty thrust bearings. This design not only dramatically reduces pump wear but also enables the pump to achieve very high volumetric and mechanical efficiency — volumetric efficiency up to ≥95% and overall efficiency ≥90%.

2. Constant Power Variable Control with Automatic Power Matching
The YCY14-1B employs pressure-compensated variable control, with outlet flow varying approximately along a constant power curve within a certain range with outlet pressure. As system pressure rises, high-pressure oil from the main body section pushes the variable piston through internal passages, automatically reducing the swash plate inclination angle to decrease pump displacement, achieving automatic matching between hydraulic system power and prime mover output power. When adjusting flow characteristics, first screw the limit screw to the upper end, then according to the required flow and pressure variation range, adjust the spring sleeve so that the initial pressure at which flow begins to change meets requirements, then screw the limit screw until flow no longer changes at final pressure. The intermediate relationship between flow and pressure variation is determined by the pump’s own design.

3. Seven-Piston Structure with Low Pulsation Output
The pump body features a seven-piston uniform distribution design. Compared to five-piston or six-piston structures, the seven-piston design delivers smoother output flow with less pressure pulsation. The plungers reciprocate as the cylinder block rotates, completing oil suction and pressure actions. The central spring presses the cylinder block against the port plate through the return plate, providing initial sealing to ensure good sealing performance immediately upon startup.

4. Rotating Cylinder Block Design — Simple Structure and Strong Self-Priming
The YCY14-1B employs a rotating cylinder block axial piston pump design, with the drive shaft spline-connected to the cylinder block to drive rotation. Compared to bent-axis designs, the rotating cylinder block structure is simpler and more compact, with small size and light weight. The series features strong self-priming capability, ability to withstand radial loads, and flexible mounting orientation. It is suitable for machine tools, forging presses, metallurgy, engineering, mining machinery, and other hydraulic transmission systems.

5. High-Strength Cast-Iron Housing with Wide Fluid Compatibility
The pump body is precision-cast from high-strength cast iron with precisely ground internal clearances. Working fluid compatibility includes L-HM46 and L-HM68 anti-wear hydraulic oils, with fluid cleanliness required at NAS 1638 Grade 8 or better. The fluid operating temperature range is -20°C to 80°C. The drive shaft is capable of withstanding radial loads with flexible mounting orientation.

6. Pump/Motor Dual-Purpose Function
The YCY14-1B series pump can be used as a hydraulic motor by simply replacing the motor port plate. This design provides compatibility for both pump and motor operating conditions, improving system design flexibility and reducing spare parts variety and inventory costs.

Application Areas

• Forging Equipment: Various oil presses and hydraulic press main pumps (one of the core application areas of the YCY14-1B 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
The YCY14-1B series port plate and cylinder block mating surfaces, as well as sliding shoe and swash plate mating surfaces, all employ hydrostatic pressure balance structures and are sensitive to fluid contamination. System fluid cleanliness must meet NAS 1638 Grade 8 or better. Recommended fluids are N46 anti-wear hydraulic oils. Monitor oil temperature rise during operation; the reservoir oil temperature should not exceed 60°C, with the optimum range being 30°C to 55°C. Replace filter elements at 500 hours after first commissioning, then every 1,000 operating hours or 6 months, whichever comes first.

2. YCY Constant Power Variable Control Adjustment
The variable characteristics of the YCY14-1B are adjusted as follows: first screw the limit screw to the upper end, then according to the required flow and pressure variation range, adjust the spring sleeve so that the initial pressure at which flow begins to change meets requirements, then screw the limit screw until flow no longer changes at final pressure. Adjust only with the system at zero load. Rotate the adjustment screw slowly and verify stable pressure gauge readings before proceeding.

3. Pre-Start Priming and Air Bleeding
Before first start, the pump housing must be filled with clean working oil through the drain port — the pump must not be started without priming. After installation, turn the coupling by hand 3–5 revolutions to expel air from the pump, avoiding dry friction damage to the piston pair. 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.

4. Installation Alignment and Suction Line Requirements
Ensure drive shaft alignment during installation, employing a flexible coupling. The pump suction port must be below the reservoir oil level, and the suction line diameter must not be smaller than the pump suction port diameter to avoid excessive suction resistance causing cavitation. Install a suction filter with a filtration rating of no less than 80 μm in the suction line.

5. Operating Temperature and Speed Control
The YCY14-1B series fluid operating temperature range is -20°C to 80°C. Avoid prolonged operation below the minimum speed (500 r/min) or above the maximum speed (2000 r/min) to prevent excessive wear of internal components. Monitor pump noise, vibration, and oil temperature during operation; if abnormal noise, increased vibration, or oil temperature exceeding 60°C occurs, stop the pump immediately for inspection. Regular inspection of pump body temperature, noise, and vibration is recommended, with immediate shutdown for troubleshooting if abnormalities occur. If the pump is to be stored for an extended period, drain the hydraulic fluid to prevent deterioration and corrosion of internal components; refill and bleed before restarting.