Overview
The ZF 4108.203.170 BEARING HOUSING is a precision-machined structural component designed to secure and align the main shaft bearings within the WG100, WG130, and WG131 transmission series. This OEM genuine part acts as the primary support cradle for the bearing assembly, ensuring concentric rotation of the input and output shafts under heavy torque loads. As a critical interface between the rotating elements and the transmission casing, the SKU 4108.203.170 directly influences gear mesh accuracy and overall drivetrain durability. When installed alongside the 4108101062 HOUSING and the 4108201297 HOUSING, this bearing housing forms a rigid, sealed chamber that withstands extreme thermal and mechanical stress in commercial vehicle applications.
Symptoms of Failure
- Oil leaks at the bearing housing seam: A worn or cracked 4108.203.170 housing allows transmission fluid to escape past the seal, leaving visible drips under the vehicle and reducing lubrication efficiency.
- Abnormal gear whine or rumbling noise: When the bearing housing loses its dimensional integrity, shaft misalignment occurs, producing a distinct low-frequency growl during acceleration or deceleration.
- Premature bearing wear and shaft play: A deformed housing cannot maintain proper bearing preload, leading to excessive radial movement that accelerates wear on the 0750116277 BALL BEARING and adjacent components.
- Intermittent gear engagement difficulty: Misalignment caused by a failing bearing housing can cause synchronizer clash or delayed shifting, particularly in WG130 and WG131 units under load.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4108.203.170 |
| Material | High-strength cast iron (GGG-40) |
| Overall Diameter | 180 mm |
| Overall Length | 95 mm |
| Bearing Bore Diameter | 100 mm |
| Weight | 2.85 kg |
| OEM Reference | ZF 4108.203.170 |
| Surface Treatment | Phosphate coating for corrosion resistance |
Compatibility
This bearing housing is engineered specifically for ZF WG100, WG130, and WG131 series transmissions. It is also compatible with select variants of the WG180 and WG200 models when used in conjunction with the correct 0630502039 RETAINING RING and 0630531064 RETAINING RING. For accurate oil level monitoring during installation, pair this housing with the 0501215601 OIL LEVEL GAGE. To prevent fluid migration at the housing interface, always replace the 0501325470 SEALING RING simultaneously. The housing also integrates with the 4108301474 INPUT SHAFT and requires the 0636302014 SCREW PLUG for proper oil gallery sealing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101062 | HOUSING | Primary transmission casing section |
| 4108201297 | HOUSING | Rear housing for output shaft support |
| 0501215601 | OIL LEVEL GAGE | Fluid level measurement tool |
| 0501325470 | SEALING RING | Prevents oil leakage at housing joints |
| 0730365280 | TYPE PLATE | Identification label for transmission model |
| 4108301474 | INPUT SHAFT | Primary power input shaft |
| 0750116277 | BALL BEARING | Supports rotating shaft within housing |
| 0630502039 | RETAINING RING | Axial bearing retention |
| 0630531064 | RETAINING RING | Secondary bearing lock ring |
| 0636302014 | SCREW PLUG | Seals oil gallery access port |
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