Overview
The ZF 4108.303.283 PLANET CARRIER is a critical rotating assembly within the planetary gear set of heavy-duty construction machinery transmissions. This OEM genuine part functions as the central hub that supports the planetary gears, transferring torque from the sun gear to the ring gear while managing high radial and axial loads. Located in the main drive section of the transmission, the planet carrier ensures smooth power distribution during shifting and load-holding operations. The SKU 4108.303.283 is precision-machined to OEM tolerances, guaranteeing exact fitment and long service life in demanding environments such as wheel loaders and graders.
Symptoms of Failure
- Grinding or whining noise during gear engagement – Worn planet carrier bearings or cracked carrier arms produce metallic sounds, especially under load, indicating imminent failure.
- Erratic shifting or gear slippage – A damaged planet carrier allows planetary gears to misalign, causing intermittent power loss and delayed clutch engagement.
- Metal debris in transmission fluid – Fractured carrier surfaces shed ferrous particles into the oil, often detected during routine oil changes or filter inspections.
- Excessive vibration at the driveline – Unbalanced or bent planet carriers create harmonic vibrations that worsen at higher RPM, reducing operator comfort and component life.
Technical Specifications
| Part Number | 4108.303.283 |
| Material | High-strength alloy steel (case-hardened) |
| Weight | 12.4 kg (27.3 lbs) |
| Outer Diameter | 185 mm |
| Overall Height | 95 mm |
| Bore Diameter | 55 mm (splined) |
| OEM Reference | ZF 4108.303.283 |
| Heat Treatment | Carburized & tempered |
Compatibility
This planet carrier is designed for use in ZF WG180, WG200, and WG210 series transmissions commonly installed in construction machinery such as compactors, excavators, and telehandlers. It also fits select models of the ZF 4WG-200 and 6WG-200 power shift transmissions. Always verify your transmission serial number against the OEM parts catalog to confirm interchangeability. The 4108101128: TRANSMISSION HOUSING and 4108201296: HOUSING are direct mating components for this carrier assembly.
During installation, ensure the 4475280018: SCREW PLUG is torqued to specification to prevent oil leaks, and use the 0501215601: OIL LEVEL GAGE to verify proper fluid levels after reassembly. For complete transmission overhauls, the 4108303034: COVER and 0636015120: HEXAGON SCREW are often replaced simultaneously.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101128 | TRANSMISSION HOUSING | Encloses and supports the gear train |
| 4108201296 | HOUSING | Secondary housing for clutch packs |
| 4475280018 | SCREW PLUG | Seals oil passages in the housing |
| 0501215601 | OIL LEVEL GAGE | Measures transmission fluid level |
| 4108303034 | COVER | Protects planetary gear access port |
| 0636015120 | HEXAGON SCREW | Fastens cover and housing sections |
| 0636302015 | SCREW PLUG | Drain or vent plug for the gearbox |
| 0501325471 | SEALING RING | Prevents fluid leaks at joints |
| 0730365280 | TYPE PLATE | Identification plate for transmission model |
| 4108108026 | INTERM.GEARBOX | Intermediate gearbox for power take-off |
