Overview
The ZF 4644.199.732 LOOSE PARTS for WG201 is a critical OEM genuine component designed to secure and stabilize internal assemblies within the WG 201 series transmission. This part functions as a retention and alignment element, ensuring that adjacent hardware remains properly seated during high-torque operations. Specifically, it interfaces with the main casing and auxiliary valve body to prevent axial displacement. The SKU 4644.199.732 is manufactured to ZF’s original tolerances, guaranteeing a direct fit without modification. When installed correctly, this loose parts kit reduces vibration and maintains hydraulic circuit integrity, directly influencing shift quality and overall transmission longevity.
Symptoms of Failure
When the ZF 4644.199.732 LOOSE PARTS begins to wear or become dislodged, operators may notice several distinct failure indicators. Intermittent gear slippage under load is a primary symptom, often occurring when the part loses its clamping force on internal shafts. Hydraulic fluid seepage from the bell housing area can develop if the loose parts fail to seal the interface between the TRANSMISSION HOUSING (4644101172) and the valve body. Another common issue is abnormal metallic rattling during neutral-to-drive engagement, caused by unsecured components vibrating against the TRANSMISSION HOUSING (4644301390). Finally, erratic shift timing may occur as the loose parts allow minor misalignment of the THREADED BUSH (4644301189), disrupting oil flow paths.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.199.732 |
| Material | Case-hardened steel with anti-corrosion coating |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions | 120 mm x 45 mm x 30 mm |
| OEM Reference | ZF 4644.199.732 |
| Thread Type | Metric fine pitch (M10 x 1.25) |
| Operating Temperature Range | -40°C to +120°C |
| Torque Specification | 45 Nm ± 5 Nm |
Compatibility
This OEM genuine part is engineered specifically for the ZF WG 201 series, but it also cross-references with several other ZF power take-off and transmission models. The 4644.199.732 LOOSE PARTS is directly compatible with the WG180, WG200, and WG211 series when used in conjunction with the SCREW PLUG (0636302005) for final retention. It is also suitable for select ZF Ecomat 4HP and ZF 6HP variants that share the same housing bolt pattern. Always verify the housing casting number against the TYPE PLATE (0730365067) before installation. For mixed-series assemblies, the O-RING (0634306198) and SEALING RING (0634801098) may be required to adapt the loose parts to older housings.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101172 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301390 | TRANSMISSION HOUSING | Secondary housing for valve body integration |
| 4644301189 | THREADED BUSH | Guides and secures shift linkage components |
| 0636302005 | SCREW PLUG | Seals hydraulic ports and prevents leakage |
| 0634306198 | O-RING | Provides static seal between mating surfaces |
| 0634801098 | SEALING RING | Prevents oil bypass around threaded fasteners |
| 0730365067 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for housing positioning |
| 4644301161 | COVER PLATE | Protects internal components from debris |
| 0636100621 | HEXAGON SCREW | Fastener for securing cover plates |
