Overview
The ZF 4644.199.916 LOOSE PARTS for WG201 is a critical service kit designed to restore the internal sealing and structural integrity of your ZF WG 201 series transmission. This OEM genuine part set contains the essential loose hardware required to secure and seal the transmission housing assembly during a rebuild or major repair. Specifically, the SKU 4644.199.916 includes the fasteners, bushings, and small components that prevent fluid migration and maintain clamping force between the main casing and the valve body. When replacing the 4644101160: TRANSMISSION HOUSING or the 4644301323: TRANSMISSION HOUSING, this loose parts kit is mandatory to ensure proper torque specifications and leak-free operation.
Symptoms of Failure
When the components within the 4644.199.916 kit degrade, operators typically experience these specific failure modes:
- External oil seepage at housing joints: Worn or missing threaded bushings and screws allow transmission fluid to weep from the mating surfaces, leaving visible drips on the bell housing.
- Intermittent gear slippage under load: Loose fasteners cause micro-movement of the valve body, resulting in inconsistent hydraulic pressure and delayed clutch engagement during uphill or heavy hauling.
- Abnormal metallic rattling from the transmission tunnel: A loose 4644301189: THREADED BUSH can vibrate against the housing, producing a distinct rattle at idle that disappears above 1500 RPM.
- Fluid contamination from external debris ingress: A missing 4475280043: SCREW PLUG leaves an open port, allowing dirt and moisture to enter the hydraulic circuit and accelerate internal wear.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4644.199.916 |
| Kit Contents | Threaded bushings, set screws, hexagon screws, screw plugs, O-rings |
| Material | Steel (zinc-plated) / Nitrile rubber (seals) |
| Weight (kit) | 0.85 kg (1.87 lbs) |
| Thread Pitch (primary) | M10 x 1.5 / M8 x 1.25 |
| OEM Reference | ZF 4644.199.916 |
| Torque Specification | 25 Nm (18.4 ft-lbs) for housing screws |
Compatibility
This loose parts kit is engineered for the ZF WG 201 series, but its components also apply to closely related models. The 4644.199.916 is directly compatible with the WG180, WG200, and WG210 transmissions that share the same housing bolt pattern and plug dimensions. It is also suitable for the WG 211 and WG 220 variants when used in conjunction with the 4644301161: COVER PLATE. Always verify the thread pitch of your existing housing before installation; the kit includes both M10 and M8 fasteners to accommodate production changes across model years.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main casing for gear train and valve body |
| 4644301323 | TRANSMISSION HOUSING | Alternate housing variant for WG201 |
| 4644301189 | THREADED BUSH | Provides wear-resistant thread for housing bolts |
| 4475280043 | SCREW PLUG | Seals unused ports against fluid loss |
| 0634306198 | O-RING | Creates hydraulic seal between housing halves |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 4644301161 | COVER PLATE | Encloses access opening on housing |
| 0636100621 | HEXAGON SCREW | Fastens cover plate to housing |
| 0631610020 | SET SCREW | Locks threaded bushings in position |
| 0501218540 | BREATHER | Equalizes internal pressure in housing |
