2CX, 3CX, 4CX
Telescopic Handlers, Wheeled Loaders, RTFL Forklifts
The mainshaft is the backbone of the gearbox. It transfers the entire torque from the converter to the individual gears. If your machine is experiencing gears popping out, loud whining or metallic clunking from the gearbox, or you find large metal shavings in the oil, this may indicate a cracked or worn mainshaft spline. Ignoring these symptoms leads to the complete destruction of the gearbox and machine immobilization.
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High Torsional Strength
Reliable power transfer
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Precision Grinding
Longer bearing and seal life
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Perfectly Matched Splines
No play, smooth operation
The accuracy and quality of materials guarantee long and trouble-free use without the need for frequent replacement.
The shaft is fully adapted to work with original bearings, gears, and clutch drums, ensuring a consistent repair.
The GX-AFTER brand is a proven and safe alternative that offers quality comparable to original parts at a much better price.
When replacing the mainshaft, it is absolutely necessary to install a new set of bearings. Installing on old bearings will lead to immediate damage to the new shaft.
During disassembly, thoroughly check the condition of gears, clutch drums, and seals. It's the perfect time for a complete gearbox inspection.
After the repair, fill the gearbox with fresh, dedicated oil, such as HYPTRON, and install a new transmission oil filter, like one from REDX.
A gearbox overhaul requires specialized tools (presses, pullers) and extensive knowledge. We recommend entrusting this repair to a qualified mechanic.
Answer: Yes, this can be a symptom. It's most often caused by a worn spline under the clutch pack responsible for that specific gear or direction. However, this requires a thorough diagnosis after disassembling the gearbox.
Question: Why did my new shaft fail after a short time?Answer: The most common reason is installing a new shaft on old, worn bearings. This causes misalignment of the shaft, leading to its rapid destruction.
Question: Does this shaft fit both Powershift and Syncro Shuttle gearboxes?Answer: Yes, this particular mainshaft model is used in both Powershift and Syncro Shuttle type transmissions in the specified JCB models.
If you are unsure whether the selected product is suitable for your machine, contact us and we will help you choose the right part and provide practical advice in minutes.
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Application: 3CX, 4CX, Telehandlers, Front loaders, RTFL forklifts

















