Overview
The ZF 4644.199.056 LOOSE PARTS kit is a critical service assembly designed specifically for the WG 181 series transmission. This OEM genuine part consolidates essential fasteners, bushings, and sealing elements required to maintain the structural integrity of the gearbox housing. Positioned within the main casing assembly, the 4644.199.056 kit ensures that the transmission housing remains securely sealed and free from vibrational loosening during high-torque operations. When rebuilding or servicing a WG181 unit, this loose parts set is indispensable for restoring factory tolerances. The SKU 4644.199.056 is often ordered alongside the 4644101047: TRANSMISSION HOUSING to guarantee a complete overhaul.
Symptoms of Failure
- Transmission fluid seepage at casing joints: Worn or missing loose parts from the 4644.199.056 kit can cause oil to weep from the housing mating surfaces, leading to gradual fluid loss and potential gearbox overheating.
- Abnormal gear engagement noise: When the threaded bush or fixing plate within this kit degrades, internal clearances increase, producing a distinct clattering sound during gear shifts under load.
- Vibration and housing misalignment: Loose fasteners from this set allow the 4644301380: HOUSING to shift slightly, causing driveline vibration that worsens at highway speeds.
- Recurring bolt loosening: If the set screws or sealing rings in this kit fail, bolts may back out repeatedly, requiring constant retorquing and risking catastrophic housing separation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.199.056 |
| OEM Reference | ZF WG181 Loose Parts Kit |
| Material Composition | Steel alloy with zinc-nickel plating |
| Weight (estimated) | 0.85 kg (1.87 lbs) |
| Kit Contents | Threaded bush, set screws, sealing rings, fixing plate, hexagon screws |
| Thread Pitch | M10 x 1.5 (primary fasteners) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This OEM genuine part is engineered for the ZF WG 181 series transmission. It is also compatible with the WG180, WG200, and select WG210 variants that share the same housing architecture. The 4644.199.056 kit directly interfaces with the 4644301189: THREADED BUSH and the 0730365067: TYPE PLATE to ensure correct identification and assembly. For transmissions built after 2015, verify housing revision level before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101047 | TRANSMISSION HOUSING | Main casing that encloses all gear sets |
| 4644301380 | HOUSING | Secondary housing for valve body assembly |
| 4644301189 | THREADED BUSH | Provides wear-resistant thread for mounting bolts |
| 0730365067 | TYPE PLATE | Identification tag with transmission serial number |
| 0631311009 | GROOVED STUD | Locating pin for precise housing alignment |
| 4644301161 | COVER PLATE | Seals the rear access port of the housing |
| 0636100621 | HEXAGON SCREW | High-tensile bolt for housing fastening |
| 0631610020 | SET SCREW | Adjustable stop for shift fork positioning |
| 0634801098 | SEALING RING | Prevents oil leakage at threaded connections |
| 4644301117 | FIXING PLATE | Retains bearing preload within the housing |
