Bogus Link

  • Call +44 (0)114 244 7775
  • Call +44 (0)114 244 7775

Looking for JCB parts? Contact our team to buy the correct part for your machine. We supply JCB spare parts from our warehouse facilities in Sheffield UK which stock over 25,000 lines. To search our online database visit JCB Parts Catalogue.

Viscous Drive 30/927049

Product Code:30/927049
Part Name:Viscous Drive
Part Category:Engine
Fits Selected:

Worldwide Delivery

This JCB 30/927049 is available for worldwide delivery. Use the button above to contact us. Our expert staff will help ensure it is the correct part for your machine.

Purchasing Options

We offer sales of OEM new, used, or aftermarket parts. In many cases we can offer a choice of all three. Please contact our team who will be able to advise you on purchasing options for the parts you need.

Technical Advice

If you're looking for specific technical details or further information about how this part integrates into JCB machinery or its maintenance requirements, contact our team of experts. They can provide detailed specifications, installation guidelines, and support regarding Viscous Drive 30/927049 and its application in JCB construction equipment.


If you are looking to buy this 30/927049 then we can help. Our sales team will assist you in purchasing this part, or with providing any advice you need to decide if it is appropriate for your JCB machine.

About This Part

The JCB Viscous Drive with part number 30/927049 is a component used in JCB construction machinery, particularly in models equipped with systems that require controlled torque transmission or differential locking capabilities. Here’s a detailed overview:

Function and Purpose:

The Viscous Drive (30/927049) is a mechanism designed to regulate torque distribution between axles or wheels in JCB equipment. It utilizes the principle of viscosity in a fluid-filled chamber to transfer torque smoothly while allowing for differential speeds between the driven components.


  • Viscous Coupling: It typically consists of two plates submerged in a viscous fluid. When torque is applied, the fluid viscosity creates resistance, causing the plates to rotate together. This allows torque to be transmitted between components while accommodating speed differences, such as during turns or uneven terrain.
  • Differential Locking: In some applications, the viscous drive can also serve as a differential locking mechanism. When one wheel loses traction and begins to spin faster, the viscous coupling engages to transfer more torque to the wheel with traction, improving overall traction and stability.

Construction and Material:

  • The Viscous Drive (30/927049) is constructed from durable materials to withstand the stresses and demands of heavy-duty construction environments. It incorporates precision-engineered components to ensure reliable performance and longevity.


The part number 30/927049 specifically identifies this viscous drive as designed for use in certain JCB machinery models equipped with differential or torque distribution systems. It is crucial to ensure compatibility with the specific equipment model to maintain optimal performance.


  • Off-Road Vehicles: Commonly used in off-road vehicles and machinery where maintaining traction and maneuverability across various terrains is essential.
  • Construction Equipment: Found in JCB’s range of construction equipment, including loaders, excavators, and articulated dump trucks, among others, where differential torque distribution enhances operational efficiency and performance.

Maintenance and Replacement:

  • Regular inspection and maintenance of the viscous drive are important to ensure proper functioning. This includes monitoring fluid levels, checking for leaks, and ensuring the mechanism operates within specified tolerances. Replacement may be required if the drive shows signs of wear or fluid degradation.

Procurement and Support:

  • Genuine JCB parts, including the 30/927049 viscous drive, should be sourced from authorized dealers or service centers to guarantee quality, compatibility, and warranty coverage. These channels also provide technical support and guidance for installation and maintenance.

Understanding the role and specifics of the JCB Viscous Drive 30/927049 is crucial for maintaining the performance and reliability of JCB construction equipment, particularly in optimizing torque distribution and enhancing operational capabilities across diverse job site conditions.

Database Updates

This part was added to our database 3 July 2024. It was last updated 9 July 2024.