Description
Overview:
This automatic belt tensioner is a non-genuine replacement for JCB excavators, designed to replace OEM reference 320/08657. It maintains the correct tension on the auxiliary drive belt to keep engine-driven components working reliably. Built for tough site conditions, it features a sturdy metal construction with a spring-loaded arm and a smooth black steel pulley with a sealed bearing for long service life. The assembly is dimensionally matched to the original for a straightforward fit on popular machines such as the JCB 3CX and 4CX. By compensating for belt stretch and vibration, it helps reduce slip, squeal and premature belt wear, supporting dependable operation of accessories like the alternator and cooling system. Non-genuine part.
Key Features:
- Non-genuine replacement for OEM 320/08657
- Direct-fit for JCB 3CX and 4CX, also used on 5CX where specified
- Spring-loaded mechanism maintains consistent belt tension under load
- Durable metal body and smooth steel pulley with sealed bearing
- Reduces belt slip, noise and wear for longer belt life
- Helps protect driven components such as alternator and coolant pump
- Supplied as a complete tensioner assembly for quick installation
- No periodic adjustment required; low maintenance
- Suited to heavy-duty construction use and harsh environments
Typical Applications:
Used when the existing tensioner is worn, noisy, seized, or causing belt slip. Ideal during belt replacement or scheduled maintenance on JCB site excavators working in construction, utilities, groundworks and plant hire. Helps restore stable auxiliary drive performance and prevent unplanned downtime.
Also known as:
Automatic belt adjuster, auxiliary belt tensioner, accessory drive tensioner, serpentine belt tensioner, idler tensioner assembly.
Fits Models:
3CX, 4CX, 5CX
Alternate Part Numbers:
320/08657, 32008657
Product Specifications
| L&S Part No. | 900 941 |
|---|---|
| Part Type | Non Genuine Part |
| OEM No. | 320/08657 |
| Unit of Sale | 1 |
| Applications | 3CX, 4CX, 5CX |
| Machine Type | Excavators |
| Fits Brands | JCB |
| Fits Models | 3CX |
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