Overview
The ZF 4644.308.169 BUSH for WG200 is a precision-engineered wear component designed to maintain proper shaft alignment and reduce friction within the ZF WG200 series transmission. This OEM genuine part, identified by SKU 4644.308.169, acts as a sacrificial bearing surface that supports rotating shafts inside the transmission housing assembly. It is typically pressed into the TRANSMISSION HOUSING or the HOUSING to ensure concentric rotation and prevent metal-on-metal contact between the shaft and the casing. Without this bushing, the transmission would experience accelerated wear on adjacent components, leading to premature failure of the entire gear train.
Symptoms of Failure
When the 4644.308.169 bushing wears out, operators will notice distinct performance issues. Look for these specific failure symptoms to diagnose a worn bushing:
- Transmission oil leaks around the shaft seal – A worn bushing allows the shaft to wobble, breaking the seal between the shaft and the TYPE PLATE, resulting in fluid seepage.
- Gear slipping under load – Excessive radial play from a degraded bushing causes misalignment of the gear mesh, leading to intermittent power loss during acceleration.
- Metallic grinding noise from the bell housing – As the bushing wears thin, the shaft contacts the housing directly, producing a distinct scraping sound at low RPM.
- Vibration in the driveline at highway speeds – A loose bushing allows the shaft to vibrate, transmitting oscillations through the GROOVED STUD and into the transmission case.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4644.308.169 |
| Inner Diameter | 35.0 mm |
| Outer Diameter | 42.0 mm |
| Length | 25.0 mm |
| Material | Bronze alloy (CuSn8) |
| Weight | 0.08 kg |
| OEM Reference | ZF 4644.308.169 |
| Hardness | HRB 80-90 |
Compatibility
This bushing is engineered for the ZF WG200 series transmission family. It is directly compatible with the following ZF models: WG180, WG200, WG210, and WG220. The part also fits select variants of the ZF Ecomat 4HP and 5HP series when used with the appropriate ADAPTER. Always verify the shaft diameter and housing bore dimensions against your transmission’s service manual before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101142 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train |
| 4644301301 | HOUSING | Secondary housing for valve body or clutch pack |
| 0730365067 | TYPE PLATE | Identification plate affixed to the transmission |
| 0631311009 | GROOVED STUD | Fastener used to secure housing components |
| 4644303060 | COVER PLATE | Seals the rear of the transmission housing |
| 4644303061 | COVER PLATE | Alternate cover plate for different housing variants |
| 4475280078 | ADAPTER | Interface component between transmission and engine |
| 4644106306 | SHIFT SYSTEM | Mechanical assembly for gear selection |
| 4644306499 | COVER PLATE | Protective cover for the shift mechanism |
| 4644159351 | SHIFT SYSTEM | Alternative shift system for WG200 variants |
