Overview
The ZF 4108.306.102 RING is an OEM genuine internal component engineered for precise load distribution and sealing within heavy-duty ZF powershift transmissions. This ring sits directly between the rotating clutch pack and the stationary housing, acting as a critical wear surface that absorbs axial thrust and maintains hydraulic pressure integrity. The SKU 4108.306.102 is specifically designed to interface with the 4108101151: HOUSING and the 0501211695: MOTOR assembly, ensuring that torque transfer remains smooth under extreme loads in construction machinery applications. Without this ring, the transmission cannot maintain the necessary clamping force for gear engagement.
Symptoms of Failure
When the ZF 4108.306.102 RING wears beyond tolerance, operators will notice distinct performance degradation. Common failure indicators include:
- Hydraulic oil leaks around the clutch housing – A worn ring allows pressurized ATF to bypass the seal, leading to visible drips near the bell housing.
- Intermittent gear slipping under load – As the ring loses its thickness, clutch pack clearance increases, causing the transmission to slip when excavating or grading.
- Delayed engagement when shifting from neutral to drive – Reduced ring height prevents the piston from fully compressing the clutch discs, resulting in a sluggish takeoff.
- Metallic debris in the transmission fluid – Advanced wear generates fine steel particles that contaminate the oil and accelerate damage to the 0501314793: COVER and 0501314799: BUSH.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4108.306.102 |
| Material | Case-hardened alloy steel (16MnCr5) |
| Outer Diameter | 142.0 mm |
| Inner Diameter | 118.5 mm |
| Thickness | 4.75 mm |
| Weight | 0.21 kg |
| Surface Hardness | 58-62 HRC |
| OEM Reference | ZF 4108.306.102 |
Compatibility
This ring is a direct fit for ZF powershift transmissions commonly found in wheel loaders, dozers, and telehandlers. It is validated for use in the following transmission models:
- ZF WG180 – 4-speed and 6-speed variants
- ZF WG200 – All series with hydraulic clutch packs
- ZF 4WG-200 – Counter-shaft designs
- ZF 6WG-250 – Heavy-duty off-highway units
Always verify the ring groove condition inside the 4108101151: HOUSING before installation, as a damaged groove will cause premature failure of the new ring.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4108101151 | HOUSING | Encloses the clutch pack and ring assembly |
| 0501211695 | MOTOR | Hydraulic drive motor for clutch actuation |
| 0501314793 | COVER | Seals the clutch housing and retains oil |
| 0501314799 | BUSH | Wear sleeve for the clutch shaft |
| 0735370299 | TAPERED ROLLER BEARING | Supports axial and radial shaft loads |
| 0501317874 | HOUSING | Secondary housing for planetary gears |
| 0501317875 | ROLLER | Needle roller for gear support |
| 0501209497 | PISTON | Hydraulic piston for clutch engagement |
| 0501317876 | COMPRESSION SPRING | Returns piston to disengaged position |
| 0501314823 | BUSH | Guide bushing for shift fork |
