A genuine rear crankshaft oil seal, a key component for sealing the engine block. Designed by JCB engineers to provide a perfect seal at the junction with the flywheel. The high-quality PTFE (Teflon) sealing lip guarantees maximum resistance to high temperatures and the aggressive action of engine oil, which is essential for the long and trouble-free operation of DieselMax and EcoMax engines.
Genuine JCB product – a guarantee of the highest quality, perfect fit, and 100% compatibility with your machine.
| Brand (Machine Type) | Model |
|---|---|
| JCB (Backhoe Loaders) | 3CX, 4CX (with DieselMax / EcoMax engines, manufactured after 2005) |
| JCB (Telehandlers) | Loadall (wide range of models with DieselMax / EcoMax engines) |
| JCB (Wheel Loaders) | Various models with DieselMax / EcoMax engines |
The list above is for reference. It is crucial to ensure that your machine is fitted with a JCB DieselMax or EcoMax engine.
Replacing the rear main seal is a major operation that requires removing the transmission and flywheel. To avoid a repeat repair, always use fresh, clean HYPTRON engine oil and replace the flywheel bolts with new ones. Also, check the condition of the pilot bearing.
The rear crankshaft seal is a barrier that prevents engine oil from leaking into the clutch or torque converter housing. Its failure leads to costly and dangerous consequences, including a destroyed clutch disc and the risk of fire.
Replace the seal if you notice any of the following symptoms:
✓ Uncompromising Quality: Choose a Genuine JCB Part
By choosing a genuine JCB seal, you are investing in 100% certainty and peace of mind. You receive a part designed specifically for your engine, which guarantees a perfect fit, maximum temperature resistance, and the longest possible service life. Don't risk it with aftermarket parts – choose the quality that protects your machine.
See a leak between the engine and transmission? Don't wait for the clutch to be destroyed!
This is one of those repairs that shouldn't be postponed. Order a genuine seal today and do the repair right the first time!
This is one of two main possibilities. A leak in this area can come from either this seal (engine oil, usually black) or the transmission charge pump seal (hydraulic/transmission oil, red or yellow). You must identify the type of leaking oil.
2. Is replacing this seal complicated?Yes, this is one of the more labor-intensive repairs because it requires splitting the engine from the transmission and removing the flywheel. It is a job best left to an experienced mechanic.
3. Will this seal fit older machines with a Perkins engine?No, this model is designed exclusively for the newer JCB DieselMax and EcoMax engines. Seals for Perkins engines have different dimensions and part numbers.
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Genuine JCB Quality
Reliability and durability just like the original.
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Clutch Protection
Prevents oil contamination and destruction of the disc.
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Temperature Resistance
PTFE material guarantees long service life.
Have doubts or need confirmation to avoid costly downtime? Call us. Our experts will help you choose the right part to get your equipment back to work as soon as possible.
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Suitable for JCB 3CX 4CX backhoe loaders and telehandlers with DieselMax / EcoMax JCB engines after 2005.

















