Overview
The ZF 4644.183.042 LOOSE PARTS kit is a critical service component designed specifically for the WG 201 series transmission. This genuine OEM assembly includes all necessary loose hardware and small fittings required to secure and seal the transmission housing during rebuilds or maintenance. The SKU 4644.183.042 typically contains fasteners, bushings, and sealing elements that interface directly with the main casing and internal valve body. Without this kit, proper torque specifications and fluid containment cannot be achieved, leading to premature wear. It is often replaced in conjunction with the 4644101160: TRANSMISSION HOUSING or the 4644301323: TRANSMISSION HOUSING to ensure a complete seal.
Symptoms of Failure
- External oil seepage around the bell housing: When the loose parts degrade, the sealing washers and O-rings lose elasticity, causing fluid to weep from bolt holes and mating surfaces.
- Loose or rattling transmission cover plates: Worn threaded bushings and screws allow the 4644301189: THREADED BUSH to back out, creating audible vibration and potential contamination ingress.
- Intermittent gear engagement hesitation: A compromised 4475280043: SCREW PLUG can cause pressure loss in the valve body, leading to delayed shifts or slipping under load.
- Corrosion or thread galling on fasteners: Exposed hardware from a failed loose parts kit accelerates oxidation, making future disassembly difficult and risking housing damage.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4644.183.042 |
| Material Composition | Steel (zinc-plated) / Nitrile rubber seals |
| Weight (approx.) | 0.45 kg (1.0 lb) |
| Thread Pitch (primary) | M8 x 1.25 |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF WG 201 Series |
Compatibility
This loose parts kit is engineered for the ZF WG 201 transmission family. It is also compatible with the WG 180, WG 200, and WG 210 series when used with the correct housing variant. The kit directly supports installations involving the 4644301161: COVER PLATE and the 0636100621: HEXAGON SCREW. Always verify the housing casting number before ordering to ensure thread compatibility with the 0631610020: SET SCREW.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4644301323 | TRANSMISSION HOUSING | Alternate housing variant for WG 201 |
| 4644301189 | THREADED BUSH | Reinforced insert for fastener retention |
| 4475280043 | SCREW PLUG | Seals hydraulic passages in valve body |
| 0634306198 | O-RING | Fluid seal between housing and cover |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 4644301161 | COVER PLATE | Protects internal components from debris |
| 0636100621 | HEXAGON SCREW | Fastener for housing and cover attachment |
| 0631610020 | SET SCREW | Adjustable locking screw for shift forks |
| 0501218540 | BREATHER | Pressure equalization vent for transmission |
