Overview
The ZF 4644.199.861 LOOSE PARTS kit is a critical service assembly designed specifically for the WG 200 series transmission. This OEM genuine part contains the essential loose components required to maintain internal hydraulic and mechanical integrity during a rebuild or major repair. Positioned within the valve body and clutch pack area, this kit ensures proper sealing, pressure regulation, and component retention. The SKU 4644.199.861 is factory-matched to ZF’s exact tolerances, eliminating guesswork during overhaul. When replacing this assembly, technicians often pair it with a new 4644101222: TRANSMISSION HOUSING to guarantee a leak-free interface, while the 4644301226: TRANSMISSION HOUSING provides the structural foundation for the entire gear train.
Symptoms of Failure
- Erratic shift timing and clutch slip: Worn loose parts in the valve body cause inconsistent hydraulic pressure, leading to delayed or harsh gear engagement.
- Internal oil leaks and low fluid pressure: Degraded seals and gaskets within this kit allow transmission fluid to bypass, resulting in visible drips or a drop in line pressure.
- Metallic debris in the oil pan: As these loose components fatigue, small fragments can break free, contaminating the fluid and accelerating wear on adjacent parts like the 0730365067: TYPE PLATE.
- Unusual noise during gear changes: Loose fasteners or spacers can rattle internally, producing a distinct clatter that worsens under load.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.199.861 |
| Material Composition | Steel alloy, nitrile rubber, aluminum |
| Weight (approx.) | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 120 mm x 80 mm x 35 mm |
| OEM Reference | ZF 4644.199.861 (Genuine) |
| Operating Temperature Range | -40°C to +120°C |
| Thread Pitch (if applicable) | M8 x 1.25 |
Compatibility
This LOOSE PARTS kit is engineered for the ZF WG 200 series, including the WG180, WG200, and WG210 variants. It is also compatible with select off-highway transmissions in the ZF Ecomat family that share the same valve body architecture. For a complete rebuild, verify that the 0631311009: GROOVED STUD is torqued to factory specifications, as this fastener secures the kit within the housing. Always cross-reference your transmission serial number with the OEM parts list to confirm fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101222 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4644301226 | TRANSMISSION HOUSING | Secondary housing for torque converter section |
| 0730365067 | TYPE PLATE | Identification plate with transmission model and serial number |
| 0631311009 | GROOVED STUD | Locating pin for alignment of valve body components |
| 4644301298 | COVER PLATE | Protective shield over clutch piston access |
| 0634306525 | O-RING | Static seal for hydraulic circuit ports |
| 0636305026 | SCREW PLUG | Threaded plug for oil gallery sealing |
| 4475280078 | ADAPTER | Interface fitting for external cooler lines |
| 4644301279 | SCREEN SHEET | Fine mesh filter for oil sump debris |
| 4644301088 | SEALING CAP | End cap for unused hydraulic ports |
