A critical drivetrain component – this is a complete rear axle differential assembly. It is a ready-to-install sub-assembly containing both the differential housing (carrier) and the internal gear set (satellite and spider gears). It is responsible for transferring power from the pinion gear to the axle shafts while allowing the wheels to rotate at different speeds when turning. Designed for a wide range of JCB machines, including 3CX/4CX backhoes, loaders, and JS wheeled excavators.
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| Brand | Type / Series / Model |
|---|---|
| JCB | Backhoe Loaders: 3CX, 4CX Telehandlers (Loadall) Wheel Loaders Wheeled Excavators: JS130W, JS145W, JS160W, JS175W Rough Terrain Forklifts (RTFL) |
The list above is for reference. Please verify the part number before purchasing.
Installing a differential is a precision operation. The inside of the axle housing must be kept perfectly clean. Any metal filings left from the old failure will immediately destroy the new mechanism. Installation requires setting the correct backlash and contact patch with the pinion gear.
The differential allows the wheels on the same axle to rotate at different speeds, which is essential for turning. Its failure usually manifests as loud metallic noises from the axle or a complete loss of drive.
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"Satellites" (or spider gears) are the small gears inside the differential carrier. They rotate on their own pins (the cross pin) and mesh with the side gears (crown wheels) that are connected to the axle shafts. They are what allow one wheel to turn faster than the other during a turn.
2. Does this differential include the ring gear?No. This product is the complete satellite carrier (housing + satellite gears). The ring gear is the large gear that this assembly bolts into. The ring gear is typically replaced as a matched set with the pinion gear.
3. What happens if the "backlash" is set incorrectly?Setting the backlash (the small gap between the ring and pinion gear teeth) is critical. Too little backlash will cause the gears to bind, overheat, whine, and seize. Too much backlash will cause a loud "clunk" when accelerating/decelerating and will eventually chip and destroy the gear teeth.
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Complete rear differential (housing + satellites) suitable for JCB 3CX 4CX backhoe loaders, telescopic loaders and JS130W, JS145W, JS160W, JS175W wheeled excavators.

















