Overview
The ZF 4108.303.404 CLUTCH BODY is a precision-machined hydraulic component that serves as the central actuation hub within the WG100, WG130, and WG131 transmission assemblies. This OEM genuine part transfers hydraulic pressure from the control valve to engage and disengage the clutch packs, directly influencing gear selection and torque flow. The SKU 4108.303.404 is engineered to ZF’s exacting tolerances, ensuring consistent clamping force and minimal internal leakage. It sits between the main housing and the rotating clutch drum, making it a critical link in the power transmission chain. For optimal sealing and alignment, this clutch body is often installed alongside the 4108101115: HOUSING and the 4108201277: HOUSING, which provide the structural envelope for the clutch pack assembly.
Symptoms of Failure
- Delayed or harsh engagement – When the clutch body’s internal bores wear, hydraulic pressure drops, causing a noticeable lag when shifting from neutral to drive or reverse. This is a common search query for “ZF transmission slow engagement WG130.”
- Oil leaks at the bell housing – Cracks or porosity in the clutch body casting allow transmission fluid to escape, often pooling near the drain plug. This symptom is frequently searched as “ZF WG100 oil leak from clutch housing.”
- Gear slipping under load – A worn clutch body cannot maintain sufficient clamping force, leading to clutch pack slip during acceleration. Technicians often look for “ZF transmission slipping in 3rd gear WG131.”
- Contaminated hydraulic fluid – Internal wear particles from the clutch body can circulate through the system, accelerating wear on the 0501313402: DRAIN VALVE and other valve bodies.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4108.303.404 |
| Material | High-grade aluminum alloy (A356-T6) |
| Weight | 2.85 kg (6.28 lbs) |
| Outer Diameter | 185 mm |
| Overall Height | 95 mm |
| Bore Diameter (Piston) | 72 mm |
| OEM Reference | ZF 4108.303.404 |
| Sealing Surface Finish | Ra 0.4 µm |
Compatibility
This clutch body is specifically designed for ZF’s WG-series powershift transmissions. It is a direct fit for the WG100, WG130, and WG131 models, which are commonly used in agricultural tractors, construction loaders, and industrial forklifts. While the WG180 and WG200 share similar hydraulic architectures, the 4108.303.404 is not cross-compatible due to differences in piston stroke and bolt pattern. Always verify your transmission model tag before ordering. For additional sealing integrity, pair this part with the 4108301304: BEARING COVER to protect the clutch body from debris ingress.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101115 | HOUSING | Encloses the clutch body and supports shaft alignment |
| 4108201277 | HOUSING | Secondary housing for clutch pack retention |
| 0501313402 | DRAIN VALVE | Controls fluid evacuation from the clutch cavity |
| 4108301304 | BEARING COVER | Seals the clutch body bearing from contamination |
| 4108306173 | GASKET | Provides leak-proof seal between clutch body and housing |
| 0750110040 | SHAFT SEAL | Prevents oil migration along the input shaft |
| 4108111051 | POWER TAKE-OFF | Transfers engine power to auxiliary equipment |
| 0730106757 | WASHER | Thrust washer for clutch piston preload |
| 0730106758 | WASHER | Spacer washer for clutch pack clearance |
| 0730106759 | WASHER | Adjustment washer for hydraulic balance |
