MSF-180VP Hydraulic Travel Motor

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4 year

Product details

1. Model Interpretation

MSF-180VP is an axial piston hydraulic travel motor of KYB (Kayaba) original MSF series, serving as the core power unit for crawler travel on medium and large excavators of 30–36 tons. It is commonly assembled with a GFT60 planetary reduction housing to form an integrated FINAL DRIVE complete Travel Assembly. Its full factory model is MSF-180VP-G-1.

- MSF: Series code for KYB heavy-duty travel motors

- 180: Theoretical displacement of 180mL/rev

- VP: Variable piston structure with built-in high/low speed switching valve and integrated wet parking brake

- G: Flange-mounted version integrally assembled with planetary travel reducer

2. Overall Assembly Definition

The MSF-180VP is supplied as a complete Travel Assembly by default. It consists of the upper MSF-180VP Travel Motor main body rigidly fastened to the lower 3-stage planetary travel reducer, forming the full FINAL DRIVE terminal transmission system for excavator crawler drive. The whole unit can be directly installed for replacement upon delivery without assembling scattered components.

1. Travel Motor (MSF-180VP Motor Body): Hydraulic power input component with variable piston design, converting hydraulic oil pressure into high-speed rotary power. It integrates high-low speed switching spool, overload relief valve and charge valve manifold.

2. Planetary Travel Reducer: Adopts a 3-stage NGW planetary gear mechanism to reduce rotating speed and amplify output torque. It bears heavy loads including machine climbing and bogging resistance, acting as the load-bearing core of the FINAL DRIVE.

3. FINAL DRIVE: Industry general term for the entire terminal travel transmission system (integrated assembly of motor and reducer), categorized opposite to the upper structure SWING REDUCER.

4. Travel Assembly: Common term in foreign trade spare parts referring to the fully packaged complete assembly, including motor main unit, reduction housing, planetary gear set, output hub, full set of oil seals & bearings, brake friction plates, pipe fittings and sealing gaskets as an all-in-one spare kit.

3. Core Technical Specifications

Item Specification of MSF-180VP

Assembly Classification Heavy-duty Travel Assembly (MSF-180VP Travel Motor Integrated FINAL DRIVE)

Structure Variable axial piston motor integrated with 3-stage planetary reducer

Theoretical Displacement 180 cm³/rev

Rated Working Pressure 29MPa; peak impact pressure 35MPa

Max Input Speed 2800rpm

Speed Shift Function Built-in electro-hydraulic dual-mode high/low speed switching (high-speed traveling on flat ground, low-speed high-torque operation for climbing heavy loads)

Brake Configuration Built-in multi-plate normally closed wet parking brake with hydraulic release; crawlers lock automatically on shutdown to prevent sliding on slopes

Standard Reduction Ratio 62.3:1 (matched with GFT60 reducer)

Rated Output Torque 21500 N·m

Compatible Machines SANY SY335/SY365, Hitachi ZX330, XCMG XE335, Sumitomo SH350 and other 30–36 ton excavators

Total Assembly Weight 72kg per set of Travel Assembly

Output Mode Splined shaft driving travel hub and drive sprocket

4. Structural Breakdown & Functional Description

4.1 MSF-180VP Travel Motor (Upper Hydraulic Motor Section)

As the power source of the entire FINAL DRIVE, it adopts a swashplate variable piston design:

- Equipped with a 2-position switching valve to realize automatic switching between high-speed no-load traveling and low-speed heavy-load excavation, saving fuel consumption while boosting climbing traction.

- Integrated overload protection relief valve to avoid main pump damage caused by pipe burst under high pressure when crawlers are jammed by gravel.

- Embedded wet parking brake locks the motor spindle instantly during shutdown or power failure, eliminating vehicle sliding risks during slope parking or loading operations.

- Ports P1 and P2 connect to main valve travel oil circuits, compatible with positive and negative flow hydraulic systems with strong universality.

4.2 Lower Planetary Travel Reducer Section

Matched with standard GFT60 planetary reducer for MSF-180VP, the load-bearing core of the Travel Assembly:

- 3-series tandem planetary gears made of alloy steel with carburizing and quenching treatment (HRC59–63), featuring excellent impact resistance and wear resistance for mining and breaker-intensive working conditions.

- Full oil immersion forced lubrication paired with labyrinth seals and multiple lip oil seals to resist mud immersion and sand intrusion on construction sites.

- Delivers high torque to mesh with drive sprockets and crawlers, undertaking all travel loads of the machine, serving as a critical component determining FINAL DRIVE service life.

4.3 Standard Accessory List for Complete Travel Assembly

Includes motor cylinder block, valve plate, piston slippers, return plate, full planetary gear assembly, sun gear, ring gear, output hub, full repair kit with oil seals, bearing assembly, brake steel plates & friction plates, and all mounting bolts.

5. Application Scenarios & Product Advantages

1. Working Condition Adaptability: Heavy-duty mining excavation, long-distance earthmoving relocation, bog rescue in muddy swamps, and frequent operation with hydraulic breakers.

2. Replacement Compatibility: Adopts genuine KYB original structure, perfectly replacing OEM original FINAL DRIVE. Domestic replicated versions feature 1:1 dimensional interchangeability with zero modification cost.

3. Durable Structure: High-precision lapped core friction pairs for the motor and precision ground gears for the reducer, achieving a maintenance-free service life of no less than 6000 working hours.

4. Full Foreign Trade Designation: MSF-180VP-G-1 Complete Travel Assembly, Hydraulic Travel Motor Integrated Final Drive Assembly

6. Distinction Between Similar Products

- MSF-180VP: Travel FINAL DRIVE (Travel Motor assembly for crawler propulsion)

- Previous GS20D25F: Swing FINAL DRIVE (equipped with SWING REDUCER for 360° rotation of the upper carriage)

The two differ completely in installation position, structure and usage, and cannot be interchanged for installation.