JCB 05/903806 Gear Reduction Set – Powerful Transmission for Heavy-Duty Performance

The JCB 05/903806 gear reduction set is a critical drivetrain component designed to deliver high torque and reliable power transmission in demanding construction applications. Built to withstand extreme loads, this gear set ensures smooth operation and long-lasting performance of your JCB machinery.

Compatible & Interchangeable OE Part Numbers

This gear reduction set is interchangeable with related planetary gear components, offering flexibility in maintenance and repair:

• 05/903806

Suitable JCB Applications

The JCB 05/903806 gear reduction set is commonly used in track drive and final drive systems, including:

Excavators:

• JCB JS excavator models

Other Applications:

• JCB machines equipped with planetary gearboxes in the track or transmission system

These machines rely on efficient torque conversion to operate under heavy loads and challenging site conditions.

Technical Function & Working Principle

The gear reduction set is part of a planetary gearbox system, designed to reduce rotational speed while significantly increasing torque. This is essential for heavy machinery that requires strong pulling power and controlled movement.

The JCB 05/903806 functions as a second-stage planetary gear set, working together with other gears in the transmission. It consists of a central sun gear, surrounding planet gears, and an outer ring gear.

During operation:

• Input power from the engine or hydraulic motor drives the sun gear
• Planet gears rotate around it, distributing load evenly
• The system reduces speed while multiplying torque

This results in:

• Higher tractive force
• Smooth and controlled machine movement
• Reduced stress on drivetrain components

Such systems are essential in track drives and final drives, where high torque at low speed is required for digging, lifting, and maneuvering.

Technical Specifications

• Type: Planetary gear reduction set (2nd stage)
• Application: Track drive / final drive gearbox
• Material: Hardened steel gears for durability
• Weight: approx. 10.5 kg

Why Choose Partshouse For JCB 05/903806 Gear Reduction Set?

At Partshouse, we help you keep your machines running efficiently:

• Immediately available from stock
• Delivery within 24–48 hours across Europe
• Worldwide shipping available
• High-quality replacement parts for demanding environments

Request Your Quote Today

Looking for a reliable gear reduction set for your JCB equipment? The JCB 05/903806 ensures powerful performance and long service life in heavy-duty applications.

👉 Contact Partshouse today for a competitive price quotation and benefit from fast delivery, expert support, and minimal downtime.