MAF-340VP Travel Motor
Brand: KYB (Kayaba); Domestic alternatives: Zhongchuan Hydraulic, Aidi Precision, XCMG XAM340
Type: Swash plate axial piston hydraulic travel motor, equipped with 3-stage planetary reducer (final drive)
Applicable Excavator Class: 45–120 tonnage excavators, mainly for 50–80 ton models
1. Main Specifications
- Model: MAF-340VP / MSF-340VP (Variants: MSF-340VP-110, MSF-340VP-EH)
- Displacement: 340 mL/r; Two-speed range: 228.6–337.2 cc/r
- Maximum Working Pressure: 34.3–35 MPa
- Output Torque: 22,000–25,000 N·m (complete assembly)
- Rotation Speed Range: 0–150 rpm; Two-speed: High speed ≈ 2160 rpm, Low speed ≈ 1470 rpm
- Gear Ratio: Approx. 1:55
- Mounting Flange: 30-hole design, standard installation for 50–80 ton excavators
- Weight: Approx. 720 kg (complete assembly)
2. Structure & Components
Motor Unit
Adopts swash plate axial piston structure, featuring large flow rate, high torque and two-speed shift function.
Integrated with counterbalance valve, parking brake, two-speed valve and cushion relief valve. It prevents downhill sliding, resists impact and provides overload protection.
Bidirectional rotation ensures smooth forward and reverse operation.
3-Stage Planetary Reducer
Three-stage planetary gear set delivers large reduction ratio and high output torque.
Gears are made of high-strength alloy steel with outstanding wear and impact resistance.
Built-in floating oil seal achieves reliable dustproof and leakproof performance for long service life.
Output Shaft & Connection End
Splined connection design for heavy torque transmission.
Directly matched with excavator drive sprocket to drive crawler tracks.
3. Compatible Equipment
- Hitachi: ZX450-3, ZX470-3/5G, ZX650-3, ZX670-3/5G, ZX850-3, ZX870-3/5G, ZX1000K-3, EX1200-6
- Komatsu: PC750-6/7, PC800-7/8, PC850-8, PC1250-7
- XCMG: XE700, XE900, XE950, XAM340
- Sany: SY700, SY750, SY850
- Kobelco: SK850, SK1000
- Volvo: EC700, EC750, EC950
4. Features & Advantages
- Ultra-high torque density: Specially designed for 50–80 ton excavators, delivering strong power for climbing and heavy-duty dozing work.
- Efficient two-speed design: Automatic high/low speed switching balances travel efficiency and heavy-load traction.
- Integrated safety components: Built-in parking brake and counterbalance valve effectively avoid rolling on steep slopes and eliminate impact during start and stop.
- High reliability: Piston and planetary gear structure is wear-resistant and impact-resistant, ideal for mining working conditions.
- Excellent interchangeability: Fully compatible with original KYB MSF-340VP. Cost-effective domestic replacements are widely available.
5. Model Classification
- MSF-340VP: Standard version, universal for 50–80 ton excavators
- MSF-340VP-110: Custom flange and ports for specific host machines
- MSF-340VP-EH: Reinforced version, applicable to large mining excavators such as PC800 and ZX870
- XAM340: XCMG domestic model with identical parameters to MSF-340VP
