Overview
The ZF 4108.303.169 CLUTCH BODY is a precision-engineered hydraulic component that serves as the central actuation hub within the WG100, WG130, and WG131 transmission assemblies. This OEM genuine part directly controls the engagement and disengagement of the clutch pack, translating hydraulic pressure into mechanical force. As a critical wear item, the 4108.303.169 interfaces with the 4108101112: HOUSING and the 4108201177: HOUSING to form a sealed pressure chamber. Without a properly functioning clutch body, the transmission cannot achieve smooth gear shifts or maintain torque transfer under load.
Symptoms of Failure
- Delayed or harsh gear engagement: When the clutch body loses internal sealing integrity, hydraulic pressure drops, causing a noticeable lag when shifting from neutral to drive or reverse. This often manifests as a “clunk” or jolt.
- Transmission fluid leaks near the bell housing: A cracked or worn clutch body allows ATF to bypass the piston seals, leading to visible drips around the 0636302056: SCREW PLUG and the 4108301304: BEARING COVER interface.
- Intermittent gear slipping under load: As the clutch body piston bore wears, it cannot maintain consistent clamping force on the clutch discs. This results in RPM flare without corresponding vehicle acceleration, particularly during uphill climbs.
- Burning clutch smell from overheated fluid: Partial clutch engagement caused by a failing clutch body generates excessive friction heat, oxidizing the transmission fluid and producing a distinct acrid odor.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4108.303.169 |
| Material | High-strength aluminum alloy (EN AC-42100) |
| Weight | 1.85 kg (4.08 lbs) |
| Outer Diameter | 168 mm |
| Inner Diameter | 92 mm |
| Height | 74 mm |
| OEM Reference | ZF 4108.303.169 |
| Seal Grooves | 2 (piston side), 1 (hub side) |
Compatibility
This clutch body is specifically engineered for the ZF WG series of powershift transmissions. Verified compatibility includes the WG100, WG130, and WG131 models. It may also be suitable for the WG180 and WG200 series when used in conjunction with the correct 4108306173: GASKET and 0750110040: SHAFT SEAL. Always cross-reference your transmission serial number before installation. The clutch body works in tandem with the 4108102042: INPUT shaft and the 4108302099: PLANET CARRIER to manage torque distribution.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101112 | HOUSING | Encloses the clutch body and supports input shaft bearings |
| 4108201177 | HOUSING | Rear housing that aligns the output shaft assembly |
| 0636302056 | SCREW PLUG | Seals hydraulic test ports and drain passages |
| 4108301304 | BEARING COVER | Retains the clutch body thrust bearing in position |
| 4108306173 | GASKET | Provides sealing between clutch body and housing faces |
| 0750110040 | SHAFT SEAL | Prevents fluid leakage along the rotating input shaft |
| 4108102042 | INPUT | Transfers engine torque into the clutch assembly |
| 4108302099 | PLANET CARRIER | Holds planetary gears for final drive reduction |
| 4108302007 | BEARINGSHEET | Thrust washer set for axial load management |
| 0635332196 | BALL BEARING | Supports the clutch body hub radial loads |
