A heavy-duty sun gear, a key component of the planetary gear set in the drive axle hub. Its function is to transfer torque from the axle shaft to the planet gears, thus achieving gear reduction and multiplying the driving force. Precision-machined teeth and splines guarantee a perfect fit and resistance to shearing.
Aftermarket quality product – an intelligent choice combining excellent quality with an attractive price.
| Brand (Machine Type) | Example Application |
|---|---|
| JCB (Backhoe Loaders) | 3CX, 4CX (equal-sized wheel models, axles SD55, SD70, SD80) |
| JCB (Telehandlers) | Loadall (wide range of models) |
| JCB (Wheel Loaders) | Various models |
| JCB (Other Machines) | JS Wheeled Excavators, FASTRAC, RTFL Forklifts, Vibromax Rollers |
The list above is for reference. We recommend verifying the number of teeth and splines on your machine before purchasing.
A hub overhaul is the perfect time for a comprehensive axle service. Always replace the sun gear together with a full set of planet gears and bearings. Fill the axle with new, clean HYPTRON gear oil and replace the hub seals to provide the new parts with ideal working conditions.
The sun gear is the central and most loaded component of the planetary gear set. Damage to its teeth or splines leads to the "grinding" of the entire hub, loss of drive, and can result in the wheel locking up. It is one of the most serious failures of a drive axle.
A hub rebuild is necessary if you notice:
✓ Restore Full Tractive Force: The GX-AFTER Solution
GX-AFTER is the smart choice for your machine. We deliver high-class replacements that combine excellent quality with an attractive price. Our sun gear, made of properly hardened steel, guarantees a perfect fit and durability, restoring your machine's full tractive force and eliminating the risk of catastrophic failure.
Hearing grinding noises from the axle? Don't wait for it to break down completely!
A planetary hub failure guarantees a costly downtime. Order a new sun gear with a set of planet gears today and perform a comprehensive overhaul before it's too late!
Replacing the complete planetary hub is necessary, but that's not all. The filings circulate throughout the entire axle and could have also damaged the differential and the pinion shaft bearings. After a planetary hub failure, it is recommended to disassemble and thoroughly clean the entire axle.
2. How can I differentiate between a planetary hub failure and a differential failure?A planetary hub failure usually manifests with noise and problems with one specific wheel. A differential failure (spider gears in the carrier) most often manifests with clunking noises when turning, as the wheels need to rotate at different speeds.
3. I have a 3CX with small front wheels. Will this part fit?No. This model of sun gear is intended for larger axles (e.g., SD55, SD70) used in machines with equal-sized, large wheels (3CX Super, 4CX). The standard 3CX model has smaller planetary hubs and requires different parts. Please contact us to verify.
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Restores Full Power
Guarantees correct power transmission.
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Axle Protection
Prevents further damage to the gear set.
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High Durability
Hardened steel resistant to shearing and wear.
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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