MAF-340VP Hydraulic Travel Motor
3 week ago
Product details
1. Basic Product Overview
MAF-340VP (industry standard equivalent model: MSF-340VP) is a flagship heavy-duty integrated final drive travel motor manufactured by Japan KYB (Kayaba). It is assembled as a complete unit combining a variable two-speed axial piston hydraulic motor and a 4-stage planetary reduction gearbox. Designed for heavy mining and heavy earthmoving operations, it is standard travel drive equipment for 45–120 ton ultra-large crawler excavators, matching high-end heavy-duty hydraulic configurations in the engineering machinery sector.
Model Code Explanation
- MAF/MSF: KYB series code for large-displacement heavy-load travel motors (differentiated from the medium & small tonnage MAG series)
- 340: Nominal motor displacement: 340cc/rev (oversized displacement determining ultimate output torque)
- VP: Variable Piston design with electronically controlled variable two-speed structure, featuring automatic high/low speed switching via solenoid valve
- Suffixes such as FH7, EH6, 110: Sub-models distinguished by reduction gear ratio, mounting flange, oil port layout and OEM part numbers for original host machines
2. Overall Structure & Working Principle
This hermetically integrated assembly consists of an upper motor valve section and a lower 4-stage planetary reduction section, with a full set of built-in safety hydraulic valve assemblies:
1. Upper Section: 9-Piston Swashplate Variable Hydraulic Motor Main Body
Equipped with large-bore piston assemblies and an external two-speed shift solenoid valve. It runs at high speed for no-load relocation on flat ground, and automatically downshifts to deliver amplified torque for climbing, hard soil excavation and mining heavy loads. Bi-directional oil supply enables independent control of left and right crawler steering and forward/reverse travel, with an integrated counterbalance valve to prevent crawler slipping or drifting on slopes.
2. Lower Section: Heavy-Duty 4-Stage Planetary Reduction Gearbox
Adopts carburized and quenched high-strength alloy steel sun gears, planetary gears and ring gears for multi-stage torque amplification. The large-module gear design resists impact and overload, with a large splined output shaft directly connected to the excavator sprocket, secured by heavy-duty bolts on the flange with multiple mounting holes.
3. Built-in Integrated Safety Components
- Wet multi-disc spring-applied parking brake: Instantly locks crawlers upon engine shutdown or hydraulic oil cut-off to eliminate sliding risks on steep slopes and cliff-side worksites.
- High-pressure overload relief valve & buffer valve: Absorbs impacts from rock collisions and forced stalling to protect the main hydraulic pump and the whole machine’s oil circuit.
- Makeup check valve: Prevents air suction and cavitation damage to piston components during high-speed downhill travel.
3. Core Technical Specifications
Item Detailed Specification
Motor Structure Swashplate axial piston variable hydraulic motor
Nominal Displacement 340 mL/r
Rated Working Pressure 34 MPa
Peak Impact Pressure 40 MPa
Travel Mode Fully automatic electronically controlled two-speed switching (high-speed / low-speed heavy-load)
Brake Type Wet multi-disc spring parking brake (hydraulically released)
Rotation Direction Bi-directional reversible
Applicable Machine Weight 45–120 ton large/ultra-large excavators, open-pit crawler equipment
Reduction Structure 4-stage planetary gear reduction
Overall Unit Weight Approx. 720kg
Output Spline Oversized involute spline (custom-matched to host machines)
Material Configuration Carburized alloy steel gears, cast steel housing, quenched wear-resistant alloy pistons
Certification Standards CE, ISO9001
4. Main Compatible Host Models
Japanese Original Excavators
Hitachi ZX450/ZX470/ZX670/ZX870, Komatsu PC1250, Sumitomo SH700/SH800, Kobelco SK750
Domestic Large-Tonnage Excavators
SANY SY485/SY550/SY750, XCMG XE650/XE700/XE900, Zoomlion ZE900, Lovol FR700
European & Korean Models
Volvo EC650/EC900, Caterpillar E385D/E390GC, Doosan DX800, Case CX800
5. Core Product Advantages
1. Extreme Heavy-Load Torque Output: The 340cc oversized displacement paired with 4-stage reduction delivers maximum traction for open-pit rock digging, deep foundation excavation and heavy hauling, resisting gear tooth breakage and pressure leakage during prolonged high-intensity operation.
2. Intelligent Dual-Speed Fuel Economy: High-speed cruising cuts fuel consumption during relocation, while automatic shift to low speed boosts torque for working tasks, balancing traveling efficiency and digging power.
3. High Durability Design for All Working Conditions: Fully sealed wet construction blocks dust, water and mud ingress, achieving ultra-low failure rates in harsh dusty and muddy open-pit environments.
4. Integrated Plug-and-Play Replacement: OEM-matching flange, oil ports and mounting hole positions fit original installed parts perfectly for direct whole-unit replacement without frame or pipeline modification.
5. Mature Spare Parts Supply for Maintenance: Piston assemblies, cylinder blocks, valve plates, planetary gears, brake pads and complete oil seal repair kits are readily available in the market to control maintenance costs.
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Ningbo Hengnuo Hydraulic Drive Co.,Ltd
Audited supplier
4 year
Main Product:
hydraulic motor,
gear box,
hydraulic pump,
hydraulic valve ,
hydraulic winch,
hydraulic system