A high-quality 320/03119 front crankshaft oil seal by GX-AFTER. This is a critical seal fitted in the timing cover, providing a seal for the crankshaft at the front of the engine. It fits all JCB machines equipped with JCB DieselMax, EcoMax, and Stage V engines (produced from 2005 onwards), including 3CX, 4CX backhoe loaders, telehandlers, and many others.
GX-AFTER is the smart choice for your machine. We provide high-class replacements that combine excellent quality with an attractive price. Each part is carefully verified to ensure full compatibility and reliability you can depend on.
| Brand | Type / Series / Model |
|---|---|
| JCB | Backhoe Loaders: 2CX, 2DX, 3CX, 4CX, 5CX, MIDI CX (with DieselMax/EcoMax engines, post-2005) |
| JCB | Telehandlers (Loadall): 505-560 Series (with DieselMax/EcoMax engines) |
| JCB | Wheel Loaders: 406-467 Series & TM200-TM320 Series (with DieselMax/EcoMax engines) |
| JCB | JS Excavators (Tracked & Wheeled): e.g., JS120, JS130, JZ140 (with DieselMax engines) |
| JCB | Skidsteers (Robot): 225-330 Series, Teleskid (with DieselMax/EcoMax engines) |
| JCB | Rough Terrain Forklifts (RTFL): 921-950 Series (with DieselMax/EcoMax engines) |
| JCB | Other: FASTRAC, TELETRUK, Site Dumpers (6T, 7T, 9T), Vibromax, Generators (G*R, G*RX, G*Q) |
| JCB | Engines: 320/40001 to 320/49999 (DieselMax), 320/50001 to 320/55000 (EcoMax) |
The list above is for reference. This seal fits most JCB machines produced after 2005 with a JCB DieselMax or EcoMax engine.
The 320/03119 seal is fitted in the timing cover. When replacing it, it is recommended to also replace the timing cover gasket (if the cover is removed) and the multi-groove belt (e.g., 320/08598 or 320/08608).
A leaking front crankshaft seal leads to an engine oil leak. This oil can saturate the drive belt, causing it to slip off or break. A broken belt causes an immediate loss of cooling (water pump failure) and charging, which can lead to engine seizure. Leaking oil also creates a fire hazard.
The 320/03119 seal is a dynamic lip seal fitted in the engine's front timing cover. Its garter-spring-loaded lip runs directly on the crankshaft snout, where the main pulley is mounted. It prevents engine oil from leaking out and protects the engine's internals from dust and dirt.
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No. This seal (320/03119) is exclusively for newer machines (post-2005) with JCB DieselMax, EcoMax, or Stage V engines. Older machines with Perkins engines require a different front crankshaft seal.
This is the most common cause of an oil leak in this location. Other possibilities include a leaking timing cover gasket or a leaking water pump (coolant leak).
Do you have doubts or need confirmation to avoid costly downtime? Call us. Our experts will help you select the right part to get your equipment back to work as quickly as possible.
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Front crankshaft oil seal, suitable for JCB 3CX 4CX backhoe loaders with JCB DieselMax / EcoMax / Stage V engine from 2005.

















