MAG-18V-150E-2 KYB Travel Motor B0240-18044 Final Drive

Product Overview

The MAG-18V-150E-2 is a travel motor final drive built on the KYB MAG series platform, in the MAG-18V series. The product features an integrated design combining a swash plate axial piston motor with a case-rotation planetary reduction gearbox, integrating the hydraulic motor, two-speed shifting mechanism, planetary reduction gearbox, and parking brake into a single compact housing, specifically engineered for crawler travel drive on 1.5–2.5 tonne class mini excavators. The model has mature application validation in the travel systems of Kobelco SK20 and Yanmar VIO20/VIO27, with part number B0240-18044.

The MAG series is KYB’s travel drive solution for compact construction machinery, covering MAG-16, MAG-18, MAG-26, MAG-33, MAG-85, and MAG-170 specifications, suitable for 1.5 to 100+ tonne class excavators. The MAG-18V series is the most widely used core specification, spawning variants including MAG-18V-150E, MAG-18V-190E, MAG-18V-230F, MAG-18V-270, MAG-18V-320E, and MAG-18V-350F, covering different tonnage and flow requirements.

The MAG-18V series’ core architecture includes: a swash plate axial piston motor, a case-rotation planetary reduction gearbox, a two-speed shifting mechanism, a parking brake, and a shockless relief valve. The series features swash plate piston motor drive, integrated planetary reduction, hydraulic oil lubrication, and compact integration, with extensive application foundations in the mini excavator travel drive sector.

Engineered as a form-fit-function replacement for original KYB MAG-18V series travel 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: MAG-18V-150E-2

• Part Number: B0240-18044

• Original Brand: KYB / Nachi

• Series: MAG Series Travel Motor Final Drive

• Product Type: Swash plate axial piston travel motor + case-rotation planetary reduction gearbox + two-speed mechanism + parking brake integrated assembly

• Design Feature: Swash plate piston motor, case-rotation planetary reduction gearbox, two-speed shifting mechanism, parking brake, shockless relief valve

• Displacement (reference): Approx. 16 cm³/rev (MAG-18V series general specification)

• Maximum Working Pressure (reference): Approx. 245 bar (24.5 MPa)

• Maximum Output Torque (reference): Approx. 2.26 kN·m

• Maximum Speed (reference): Approx. 70 rpm

• Maximum Flow (reference): Approx. 30 L/min

• Reduction Ratio: Approx. 45 (MAG-18V series general specification)

• Lubrication: Hydraulic oil lubricated (no gear oil change required)

• Brake: Integrated parking brake

• Relief Valve: Integrated shockless relief valve

• Mounting: Flange mounting, identical to original

• Applicable Excavator Weight: 1.5–2.5 tonnes

• Circuit: Open circuit

Data Limitation Note: Specific displacement, pressure, torque, speed, and flow data for the MAG-18V-150E-2 (B0240-18044) were not found in publicly available official specification sheets. The above technical parameters are reference data based on the sister model MAG-18V-230F, whose official technical specifications are: displacement 16.4 cm³/rev, maximum pressure 245 bar, maximum torque 2.26 kN·m, maximum speed 70 rpm, maximum flow 30 L/min. The MAG-18V-150E-2 belongs to a smaller displacement specification within the same series, and actual parameters may be slightly lower than the above reference values. It is recommended to obtain the complete technical manual from KYB/Nachi or an authorized dealer for final confirmation.

Key Technical Advantages

1. Integrated Swash Plate Motor and Case-Rotation Planetary Reduction Design

The MAG-18V-150E-2 employs the MAG series’ signature integrated architecture, combining a swash plate piston motor with a case-rotation planetary reduction gearbox into a single compact housing. The case-rotation design enables the planetary gearbox output to directly drive the track sprocket, eliminating the need for couplings and external connection components found in conventional travel drive systems. This design achieves complete travel drive functionality integration within the extremely limited undercarriage interior space of 1.5–2.5 tonne class excavators, simplifying machine hydraulic layout and reducing component count and potential leakage points.

2. Two-Speed Mechanism with Adaptive Travel Drive

The MAG-18V-150E-2 features a built-in two-speed shifting mechanism that automatically or manually switches between low-speed high-torque and high-speed modes according to travel resistance. In low-speed mode, maximum torque is delivered, suitable for heavy-load climbing and muddy terrain conditions; in high-speed mode, output speed increases for rapid flat-ground transfer. This automatic shifting characteristic enables mini excavators to maintain optimal traction performance and working efficiency across varying road conditions.

3. Maintenance-Free Gearbox with Hydraulic Oil Lubrication

The MAG-18V-150E-2’s reduction gearbox is lubricated by the excavator’s hydraulic oil, eliminating the need for separate gear oil changes. Conventional travel drive gearboxes require periodic replacement of dedicated gear oil; the MAG series eliminates this maintenance step through hydraulic oil lubrication, significantly reducing maintenance costs and downtime throughout the equipment’s lifecycle while reducing failure risk from gear oil degradation.

4. Parking Brake and Shockless Relief Valve Dual Safety Assurance

The MAG-18V-150E-2 features an integrated parking brake operating on a spring-applied, hydraulically-released principle, automatically locking the travel mechanism when hydraulic pressure drops to ensure safe parking of the excavator on slopes. A standard shockless relief valve automatically limits hydraulic shock peaks during travel start and stop, ensuring smooth travel operation, reducing hydraulic shock-induced vibration and noise, and extending the service life of the travel gearbox and track frame.

Application Areas

The MAG-18V-150E-2 is designed for travel drive systems of 1.5–2.5 tonne class mini excavators, compatible with the following machines:

• Kobelco: SK20, SK20SR, SK20SR-3

• Yanmar: VIO20, VIO20-2, VIO20-3, VIO27, VIO27-2, VIO27-3

• Volvo: EC25, ECR28

• Hitachi: EX22, EX25

• Takeuchi: TB125

• Sunward: SWE-25

The MAG-18V series has extensive application foundations in travel drive systems, compatible with mini excavators under 4 tonnes from Hitachi, Volvo, Yanmar, Takeuchi, Sunward, and other brands.

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness Control: The MAG-18V-150E-2 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. Reduction Gearbox Lubrication Inspection: The product uses hydraulic oil lubrication without gear oil replacement, but checking gearbox oil level and quality every 500 operating hours is recommended. If oil emulsification or metal particles are found, inspect internal seals and gear wear.

3. Two-Speed Shifting Mechanism Maintenance: Periodically verify the two-speed shifting valve response pressure. Conduct switching tests every 500 operating hours using 3–5 MPa pilot pressure to ensure crisp, non-sticking actuation. If switching is sluggish, check pilot circuit pressure and valve spool wear.

4. Brake Performance Testing: Periodically check the parking brake effectiveness. Ensure the travel mechanism locks reliably when brake supply pressure is zero; otherwise, inspect brake springs and friction plate wear.

5. Shockless Relief Valve Setting Verification: Verify the shockless relief valve opening pressure every 1,000 operating hours, ensuring it provides proper cushioning during travel start and stop.

6. Mounting Alignment Requirements: During installation, ensure the motor output shaft and travel drive 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.

7. Restart After Extended Storage: For travel motor assemblies 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.