Overview
The ZF 4108.303.262 PLANET CARRIER is a critical rotating assembly within the planetary gear set of heavy-duty construction machinery transmissions. This OEM genuine part transfers torque from the sun gear to the planetary gears, enabling the speed reduction and torque multiplication necessary for demanding off-highway applications. The SKU 4108.303.262 identifies the exact carrier designed to withstand high axial and radial loads. When installed correctly with the 4108101108: HOUSING and the 4108301436: INPUT SHAFT, this component ensures precise gear alignment and smooth power flow through the transmission.
Symptoms of Failure
- Erratic gear engagement or slipping under load: Worn carrier pockets or cracked carrier arms allow planetary gears to misalign, causing intermittent power loss during excavation or grading operations.
- Metallic grinding noise from the transmission sump: A failing planet carrier often produces a distinct, cyclical grinding sound as damaged needle bearings or carrier bores contact the gear teeth.
- Contaminated oil with bronze or steel particles: When the carrier surface wears, fine metallic debris enters the lubrication system, accelerating wear on the 4108306172: GASKET and adjacent seals.
- Visible oil leaks near the transmission housing joint: Excessive carrier vibration can distort the 0730365280: TYPE PLATE mounting surface, leading to fluid seepage.
Technical Specifications
| Part Number | 4108.303.262 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Diameter | 185 mm |
| Overall Height | 72 mm |
| Weight | 4.8 kg |
| OEM Reference | ZF 4108.303.262 |
| Bore Diameter (Input Shaft) | 35 mm |
| Number of Planet Pockets | 3 |
Compatibility
This planet carrier is engineered for ZF WG-series transmissions commonly used in wheel loaders, telehandlers, and graders. It is a direct fit for the WG180 and WG200 series, as well as select variants of the WG160 and WG210 models. Always verify the carrier’s spline count and pocket depth against your existing assembly. For a complete rebuild, pair this carrier with a new 0630532160: RETAINING RING and 0630531130: RETAINING RING to secure the planetary gears.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101108 | HOUSING | Encloses the planetary gear set and supports the carrier assembly |
| 4108306172 | GASKET | Seals the housing-to-carrier interface to prevent oil leaks |
| 0730365280 | TYPE PLATE | Identifies transmission model and serial number for correct part matching |
| 4108301436 | INPUT SHAFT | Transfers engine torque directly into the planet carrier |
| 0735330931 | BALL BEARING | Supports the input shaft within the carrier bore |
| 0630532160 | RETAINING RING | Locks planetary gear pins in the carrier pockets |
| 0630531130 | RETAINING RING | Secures the sun gear thrust washer to the carrier |
| 0636302014 | SCREW PLUG | Closes oil passages in the carrier hub |
| 0634801057 | SEALING RING | Prevents oil bypass between carrier and shaft |
| 4475280018 | SCREW PLUG | Seals the carrier’s lubrication feed port |
