Overview
The ZF 4644.306.252 SPACER is a precision-engineered OEM genuine component designed for the WG180, WG200, and WG201 transmission series. This critical shim element sits between the TRANSMISSION HOUSING and the planetary gear set, maintaining exact axial clearance to prevent gear train binding. As a factory-spec spacer, part number 4644.306.252 ensures proper load distribution and oil flow within the clutch pack assembly. When paired with a TRANSMISSION HOUSING and a TYPE PLATE, this spacer guarantees OEM-level alignment for heavy-duty industrial applications.
Symptoms of Failure
- Transmission oil seepage at housing joint: A worn 4644.306.252 spacer can cause uneven clamping force, leading to fluid migration past the GROOVED STUD interface.
- Intermittent gear slipping under load: When the spacer loses its original thickness tolerance, planetary gear end-play increases, resulting in torque loss during high-stress operations.
- Metallic rattling from the bell housing: Excessive clearance from a collapsed spacer produces a distinct chatter during idle or low-speed engagement.
- Overheating in the WG200 series: A deformed spacer restricts oil circulation, causing localized hot spots that degrade clutch friction material.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4644.306.252 |
| Material | Hardened steel (DIN 1.7131 case-hardened) |
| Outer Diameter | 142.0 mm |
| Inner Diameter | 98.5 mm |
| Thickness | 2.50 mm |
| Weight | 0.185 kg |
| OEM Reference | ZF 4644.306.252 |
| Surface Finish | Ground, Ra ≤ 0.8 µm |
Compatibility
This OEM genuine spacer is engineered exclusively for ZF WG-series powershift transmissions. It is a direct fit for the WG 180 Series, WG 200 Series, and WG 201 Series models. The 4644.306.252 part is commonly used in construction equipment (wheel loaders, dozers) and agricultural machinery where the transmission housing interfaces with the clutch drum assembly. Always verify your transmission serial number against the TYPE PLATE to confirm compatibility.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101043 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301194 | TRANSMISSION HOUSING | Alternate housing variant for WG200 |
| 0730365067 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Fastening stud for housing alignment |
| 4644303060 | COVER PLATE | Seals the clutch pack access port |
| 4644303061 | COVER PLATE | Alternate cover for WG201 models |
| 0634801098 | SEALING RING | Prevents oil leakage at shaft bore |
| 0634801250 | SEALING RING | High-temp variant for heavy loads |
| 0636305026 | SCREW PLUG | Closes pressure test ports |
| 0636305019 | SCREW PLUG | Magnetic drain plug option |
