Overview
The ZF 4651.306.138 ADAPTER for WG100 is a precision-machined component designed to serve as the critical interface between the transmission housing and the hydraulic control unit in ZF’s WG 100 series. This OEM genuine part ensures correct alignment and secure mounting of internal assemblies, preventing fluid bypass and maintaining system pressure. The SKU 4651.306.138 is engineered to exact ZF tolerances, making it essential for any rebuild or repair of the WG100 transmission. When installed alongside the 4651101007 TRANSMISSION HOUSING, this adapter guarantees a leak-free seal and optimal gear engagement.
Symptoms of Failure
- Oil leaks at the adapter joint: Worn or cracked adapter surfaces cause transmission fluid to seep between the housing and control unit, leading to low fluid levels and potential overheating.
- Erratic shifting or gear slipping: A degraded adapter disrupts hydraulic pressure delivery, resulting in delayed engagement or unexpected gear disengagement during operation.
- Increased vibration from the transmission: Misalignment due to a failing adapter creates abnormal noise and vibration, particularly under load or at highway speeds.
- Contamination in the hydraulic circuit: A compromised adapter allows debris to bypass filtration, accelerating wear on valves and clutches.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4651.306.138 |
| Material | Die-cast aluminum alloy with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 180 mm x 95 mm x 40 mm |
| OEM Reference | ZF 4651.306.138 |
| Sealing Surface Finish | Ra 0.8 µm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This adapter is specifically designed for the ZF WG 100 series, including models such as WG100, WG120, WG150, WG180, and WG200. It is a direct replacement for OEM units and integrates seamlessly with the 4651301029 HOUSING and 4651301024 HOUSING. For a complete seal, always pair this adapter with a new 0634303928 O-RING to prevent fluid migration between mating surfaces.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear sets and shafts |
| 4651301029 | HOUSING | Secondary housing for valve body assembly |
| 0634303928 | O-RING | Seals adapter-to-housing interface |
| 4651301024 | HOUSING | Intermediate housing for clutch pack support |
| 4651203002 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4651303005 | SCREEN SHEET | Secondary filtration element |
| 0636101032 | CAP SCREW | Fastens adapter to transmission housing |
| 0630361028 | SEALING CAP | Blocks unused ports in the adapter |
| 4475280060 | SCREW PLUG | Seals threaded openings |
| 0634303312 | O-RING | Provides secondary seal for plug fittings |
