M2X150 Kawasaki Hydraulic Motor 150cc 29MPa Swing Motor

Product Overview

The M2X150 is a swash plate axial piston fixed displacement swing motor built on the Kawasaki M2X series platform, in the 150cc displacement size. The motor features a swash plate design with axial piston/slipper arrangement, specifically engineered for 360° swing drive of the upper structure on excavators and cranes, with a parking brake built into the motor section. The M2X150 offers a displacement of 150 cm³/rev, maximum working pressure of 29 MPa (290 bar), maximum torque of approximately 13,000 N·m, maximum speed of approximately 90 rpm, and maximum flow of up to 150 L/min.

The M2X series is Kawasaki’s compact motor series developed for swing applications in construction machinery, covering displacement sizes including M2X22, M2X45, M2X55, M2X63, M2X96, M2X120, M2X128, M2X146, M2X150, M2X170, and M2X210. The M2X series is a compact motor with good results in shovel turn applications, and the reduction gear is designed to shorten the length in the axial direction for effective space savings. The M2X150 has mature application validation in Hitachi EX200/EX220/EX400/EX400-3/EX400-5/EX450-3 excavators and CX350DR/CX500/CX550/CX700/CX1000 crawler cranes, as well as Hyundai R160LC-7/R180LC-7/R250LC-7/R290LC-7/R300LC-7/R450LC-7 excavators.

Engineered as a form-fit-function replacement for original Kawasaki M2X150 series motors, this model maintains identical mounting flange dimensions, shaft specifications, and port locations, enabling drop-in interchangeability without modification to the host machine’s mounting interface or hydraulic circuit. Each unit undergoes 100% simulated load testing prior to shipment, validating output torque and volumetric efficiency against original specifications.

Technical Specifications 

• Model: M2X150

• Original Brand: Kawasaki

• Series: M2X Series Swash Plate Fixed Displacement Swing Motor

• Motor Type: Swash plate axial piston fixed displacement motor

• Design Feature: Swash plate configuration, axial piston/slipper arrangement, fixed displacement, integrated parking brake

• Displacement: 150 cm³/rev (148–150 cm³/rev depending on variant)

• Maximum Working Pressure: 29 MPa (290 bar / 4,206 psi)

• Rated Pressure: 29.4 MPa (300 kgf/cm²)

• Maximum Pressure: 34.3 MPa (350 kgf/cm²)

• Maximum Torque: Approx. 13,000 N·m

• Maximum Speed: Approx. 90 rpm (output end) / 1,750 rpm (motor end)

• Maximum Flow: Approx. 150 L/min

• Brake Release Pressure: 2–7 MPa

• Maximum Brake Release Pressure: 4.9 MPa (50 kgf/cm²)

• Mounting: Flange mounting, direct connection to reduction gear ring gear

• Applicable Excavator Tonnage: 20–22 tonnes (16-hole) / 20–30 tonnes (12-hole)

• Circuit: Open circuit

• Weight (approx.): Varies by configuration

Key Technical Advantages

1. Swash Plate Axial Piston Design with High Power Density

The M2X150 employs the classic swash plate design of the Kawasaki M2X series, with axial pistons and slippers arranged in parallel, changing piston stroke through a tiltable swash plate. The M2X series features a compact design with the piston/cylinder part, mechanical brake part, and attached valve part neatly arranged, achieving exceptionally high power density. At 150 cm³/rev displacement, the motor delivers maximum torque of approximately 13,000 N·m, suitable for swing drive of medium-to-large excavators.

2. Integrated Parking Brake for Slope Safety

The M2X150 features a parking brake built into the motor section. The brake operates on a spring-applied, hydraulically-released principle, automatically locking the swing mechanism when hydraulic pressure drops to ensure safe parking of the excavator on slopes. Brake release pressure is 2–7 MPa with a maximum release pressure of 4.9 MPa. An optional service brake is available for additional safety protection.

3. Integrated Relief and Make-Up Valves for Swing Function

The M2X series motor has built-in relief valve and make-up valve elements, enabling swing function simply by connecting the piping from the control valve to the motor port, simplifying system piping design. This design reduces external connection points and leakage risks, while the built-in relief valve automatically limits hydraulic shock peaks during swing start and stop, ensuring smooth rotation of the upper structure.

4. Compact Structure with Direct Reduction Gear Integration

The M2X series’ reduction gear is designed to shorten the length in the axial direction, and the motor’s mounting flange has been widened to enable direct connection with the ring gear of a reduction gear for an extremely compact installation. This design eliminates couplings and external mounting brackets within the limited swing platform interior space of excavators, reducing system component count and potential failure points, while improving drive system rigidity and alignment precision.

Application Areas

• Hitachi Excavators: EX200, EX220, EX400, EX400-3, EX400-5, EX450-3, etc.

• Hitachi Crawler Cranes: CX350DR (drilling rig), CX500, CX550, CX700, CX1000, CX1100, CX1800, CX2000, etc.

• Hyundai Excavators: R160LC-7, R180LC-7, R250LC-7, R290LC-7, R300LC-7, R320LC-7, R450LC-7, R500LC-7, etc.

• Daewoo/Doosan Excavators: DH258, DH225, R210, R225, etc.

• Construction Machinery: Other excavators and cranes requiring precise swing control

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness Control: The M2X150 features precision clearances in the piston and distribution pairs. Maintain hydraulic fluid cleanliness at ISO 18/15 or NAS Level 9 or better. Replace hydraulic fluid and filter elements every 1,000 operating hours or annually, with filter element filtration accuracy no less than 10 μm.

2. Brake Performance Testing: Periodically check the integrated parking brake effectiveness. Ensure the swing mechanism locks reliably when brake supply pressure is zero, with brake release pressure within the 2–7 MPa range. If brake release pressure is abnormal or braking effectiveness declines, inspect brake springs and friction plate wear.

3. Built-in Relief Valve Setting Verification: Verify the built-in relief valve opening pressure every 1,000 operating hours, ensuring it provides proper cushioning during swing start and stop. If swing action exhibits shock or abnormal noise, inspect valve function.

4. Mounting Alignment Requirements: During installation, ensure the motor output shaft and swing bearing gear mesh precision. Flange faces must be clean and burr-free, with bolts tightened diagonally to the specified torque. Apply appropriate grease to spline mating surfaces to prevent corrosion.

5. Case Drain Leakage Monitoring: Inspect case drain leakage every 500 operating hours; normal leakage should remain below 2 L/min. A sudden increase indicates potential wear on piston pairs or the distribution plate.

6. Restart After Extended Storage: For motors stored over 6 months, manually rotate to confirm free rotation before restart. Run at low pressure under no load for 10 minutes, confirming normal case temperature and leakage before gradually applying load.