Overview
The ZF 4644.183.033 LOOSE PARTS set is a critical service kit designed specifically for the WG 201 series transmission. This assembly contains the essential fasteners, seals, and positioning components required to secure internal clutch packs and valve body assemblies within the main gear train. As an OEM genuine part, SKU 4644.183.033 ensures precise fitment and load distribution, preventing axial play that can lead to premature wear. When paired with a new 4644101160 TRANSMISSION HOUSING, this loose parts kit restores the structural integrity of the transmission casing, while the 4644301323 TRANSMISSION HOUSING provides the necessary mating surface for torque retention.
Symptoms of Failure
- Intermittent gear slippage under load — When the loose parts wear, clutch pack clearance increases, causing the transmission to lose torque during acceleration or hill climbs.
- Oil seepage from housing joints — Deteriorated seals within the 4644.183.033 kit allow transmission fluid to weep past the 4644301189 THREADED BUSH, leaving visible stains on the bell housing.
- Metallic rattling at idle — Loose positioning components create vibration between the valve body and housing, producing a distinct chatter that worsens as fluid warms up.
- Delayed engagement from Park to Drive — Worn fasteners fail to maintain proper hydraulic pressure, causing a 2–3 second lag before gear engagement.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.183.033 |
| Material Composition | Case-hardened steel / Nitrile rubber seals |
| Weight | 0.45 kg (1.0 lb) |
| Thread Pitch | M10 x 1.5 (primary fasteners) |
| OEM Reference | ZF 4644.183.033 |
| Operating Temperature Range | -40°C to +120°C |
| Torque Specification | 45 Nm ± 5 Nm |
Compatibility
This genuine ZF loose parts kit is engineered for the WG 201 series, but its fastener geometry and seal dimensions also suit the WG180, WG200, and WG210 transmissions. The kit integrates directly with the 4475280043 SCREW PLUG to seal pressure test ports, and it is commonly specified during rebuilds of ZF 6WG200 and 8WG210 models. Always verify housing casting numbers before installation to ensure thread compatibility.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main casing for gear train support |
| 4644301323 | TRANSMISSION HOUSING | Secondary housing for valve body mounting |
| 4644301189 | THREADED BUSH | Wear-resistant insert for bolt holes |
| 4475280043 | SCREW PLUG | Seals hydraulic test ports |
| 0634306198 | O-RING | Fluid seal between housing sections |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 4644301161 | COVER PLATE | Protects clutch pack access opening |
| 0636100621 | HEXAGON SCREW | Fastener for cover plate retention |
| 0631610020 | SET SCREW | Adjustable stop for shift linkage |
| 0501218540 | BREATHER | Pressure equalization vent |
