Overview
The ZF 4644.199.330 LOOSE PARTS kit is a critical service assembly designed for the WG 200 series transmission. This genuine OEM part number 4644.199.330 contains the specific loose components required to maintain the internal hydraulic and mechanical integrity of the gearbox. It sits within the main valve body and clutch pack area, ensuring proper fluid routing and component retention. When rebuilding or servicing a WG200, this kit replaces all worn fasteners, seals, and small hardware that cannot be reused. It is often installed alongside the 4644105413: DISCONNECTION assembly to guarantee a complete overhaul of the hydraulic circuit.
Symptoms of Failure
When the components within the 4644.199.330 kit begin to fail, operators will notice specific performance degradation. Look for these common failure symptoms:
- Intermittent gear slippage under load – Worn fasteners or seals cause pressure loss in the clutch packs, leading to hesitation during acceleration.
- External oil leaks near the bell housing – Degraded sealing rings and loose hardware allow transmission fluid to escape, often mistaken for a main seal failure.
- Erratic shift timing – Loose components within the valve body disrupt the precise oil flow needed for smooth gear changes, causing harsh or delayed shifts.
- Metallic debris in the oil pan – Worn hexagon screws or grooved studs shed particles into the fluid, accelerating internal wear.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4644.199.330 |
| OEM Reference | ZF WG200 Series |
| Material | Steel, Nitrile Rubber (seals), Zinc-Plated Hardware |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions | 150 mm x 100 mm x 60 mm (kit packaging) |
| Included Components | Sealing rings, hexagon screws, grooved studs, screw plugs |
Compatibility
This genuine 4644.199.330 kit is engineered specifically for the ZF WG 200 series transmissions. It is also compatible with the WG180 and WG190 models that share the same valve body architecture. For proper installation, ensure the 4642303093: OUTPUT FLANGE is torqued to specification, and use the 0636021010: HEXAGON SCREW for securing the cover plate. The kit also interfaces directly with the 4644101040: TRANSMISSION HOUSING to seal the main cavity. Always verify your transmission serial number against ZF’s compatibility chart before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105413 | DISCONNECTION | Hydraulic circuit isolation valve assembly |
| 4642303093 | OUTPUT FLANGE | Connects transmission to driveshaft |
| 0636021010 | HEXAGON SCREW | Fastener for valve body cover |
| 4644101040 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301197 | TRANSMISSION HOUSING | Alternative housing variant for WG200 |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Alignment pin for clutch pack assembly |
| 0636015073 | HEXAGON SCREW | High-torque fastener for oil pan |
| 0634801250 | SEALING RING | O-ring for hydraulic line connections |
| 0636305026 | SCREW PLUG | Drain or fill port seal |
