Volvo EC140 EC140B 14573820 SA 8230-33470 Travel Reduction Gearbox For Excavator

Volvo EC140 EC140B 14573820 SA 8230-33470 Travel Reduction Gearbox for excavator

The excavator travel gearbox (also known as the walking gearbox or track drive gearbox) is a critical component in crawler excavators, responsible for transferring power from the engine to the tracks, enabling controlled movement. Designed to withstand heavy loads and harsh environments, it ensures efficient mobility across diverse terrains. This guide explores its working principles, construction, functions, applications, and maintenance practices.

Product Description

List of spare parts

Working Principle

The travel gearbox operates as a speed reducer and torque amplifier:

1. Power Input: Receives high-speed, low-torque rotational energy from the hydraulic motor (or engine via a driveshaft in mechanical systems).

2. Gear Reduction: Multi-stage gears (planetary/spur) reduce speed while increasing torque.

3. Output to Sprocket: The final drive transfers torque to the sprocket, which engages with the track links, propelling the excavator.

4. Direction Control: Integrated clutches or hydraulic valves enable forward/reverse movement.

Hydraulic excavators commonly use hydraulic travel motors coupled with gearboxes, while older models may employ mechanical transmissions.

Construction & Key Components

A typical travel gearbox consists of:

3.1. Housing

• Material: High-strength cast iron or alloy steel for durability.

• Function: Protects internal components and retains lubrication.

3.2. Gears

• Planetary Gear Sets: Compact design for high torque transmission.

• Spur Gears: Simpler models use spur gears for cost efficiency.

3.3. Bearings

• Tapered Roller Bearings: Handle axial and radial loads.

• Needle Bearings: Used in high-speed sections.

3.4. Shafts

• Input Shaft: Connects to the hydraulic motor.

• Output Shaft: Drives the sprocket.

3.5. Seals & Lubrication

• Lip Seals/Gaskets: Prevent oil leaks and contamination.

• Oil Bath/Grease Lubrication: Reduces friction and wear.

3.6. Brakes & Clutches

• Wet Disc Brakes: Hydraulically activated for smooth stopping.

• Directional Clutches: Enable gear shifting (in mechanical models).

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FAQ