Overview
The ZF 4108.203.151 BEARING HOUSING is a precision-machined structural component designed to support the main shaft bearings within the gear train of ZF WG-series transmissions. This OEM genuine part, identified by SKU 4108.203.151, serves as the primary alignment fixture for the bearing assembly, ensuring concentric rotation and load distribution under high-torque conditions. Positioned between the main casing and the output shaft cluster, this housing directly interfaces with the 4108101115: HOUSING and the 4108201277: HOUSING to form a sealed bearing cavity. Without this component, the transmission cannot maintain proper gear mesh geometry, leading to accelerated wear across the drivetrain.
Symptoms of Failure
- Oil seepage around the bearing cap area: A worn or cracked 4108.203.151 housing allows transmission fluid to bypass the shaft seal, leaving visible drips under the bell housing. This often accompanies a failing 0750110040: SHAFT SEAL.
- Audible bearing rumble or growling during gear engagement: As the bearing housing loses its dimensional integrity, the bearing outer race shifts, creating a low-frequency noise that intensifies under load.
- Intermittent gear slipping under moderate throttle: Misalignment caused by a deformed housing reduces the preload on the countershaft bearings, allowing the gear train to momentarily lose engagement.
- Metallic debris in the oil pan during routine changes: Spalling from the bearing race due to housing distortion produces fine steel particles, often first noticed when replacing the 0501313402: DRAIN VALVE.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4108.203.151 |
| Material | EN-GJL-250 (Gray Cast Iron) |
| Outer Diameter | 180 mm |
| Inner Bore Diameter | 130 mm |
| Overall Length | 95 mm |
| Weight | 2.8 kg |
| OEM Reference | ZF 4108.203.151 |
| Bolt Pattern | 6x M12 on 160 mm PCD |
| Surface Treatment | Phosphate coating |
Compatibility
This bearing housing is engineered for the ZF WG100, WG130, and WG131 transmission families. It is also compatible with select WG180 and WG200 variants that share the same bearing bore geometry. Always verify the housing flange thickness against your transmission’s serial plate, as later WG200 units may require the 4108301304: BEARING COVER for proper retention. The 4108.203.151 is not interchangeable with the earlier WG80 series without modifying the bearing spacer stack.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101115 | HOUSING | Main casing section that mates with the bearing housing |
| 4108201277 | HOUSING | Intermediate housing for the output shaft cluster |
| 0501313402 | DRAIN VALVE | Oil drain port assembly for the bearing cavity |
| 4108301304 | BEARING COVER | Seals the outer face of the bearing housing |
| 4108306173 | GASKET | Prevents oil leakage between housing faces |
| 0750110040 | SHAFT SEAL | Dynamic seal for the input shaft |
| 4108111051 | POWER TAKE-OFF | PTO drive gear assembly |
| 0730106757 | WASHER | Thrust washer for bearing preload |
| 0730106758 | WASHER | Spacer washer for shaft alignment |
| 0730106759 | WASHER | Lock washer for bearing retention |
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