Overview
The ZF 4644.183.058 LOOSE PARTS for WG200 is a critical OEM genuine component designed to maintain the integrity of your ZF WG200 series transmission. This part functions as a specialized fastener or retention element within the valve body or clutch assembly, ensuring precise hydraulic pressure control and preventing unintended disassembly of internal components. The SKU 4644.183.058 is engineered to exact ZF tolerances, making it essential for restoring factory-spec performance during a rebuild or overhaul. When installed alongside the 4644101223: TRANSMISSION HOUSING or the 4644301225: TRANSMISSION HOUSING, this loose part ensures that all sub-assemblies remain securely positioned under high torque and thermal cycling.
Symptoms of Failure
When the ZF 4644.183.058 LOOSE PARTS begins to degrade or becomes dislodged, operators often report intermittent gear slippage under load, particularly during upshifts in the 3rd to 5th gear range. Another common failure symptom is erratic shift timing or harsh engagement, as the loose part can no longer maintain proper valve body alignment. You may also notice fine metallic debris in the transmission fluid, indicating that the part has fractured and is circulating through the system. Finally, unusual vibration or rattle from the transmission housing at idle can signal that this component has loosened, potentially damaging the 0730365125: TYPE PLATE or adjacent assemblies.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4644.183.058 |
| OEM Reference | ZF 4644.183.058 |
| Material | Hardened alloy steel with anti-corrosion coating |
| Weight | Approx. 0.045 kg (0.10 lbs) |
| Dimensions (L x W x H) | 28 mm x 12 mm x 8 mm |
| Thread Pitch | M6 x 1.0 (if applicable) |
| Operating Temperature Range | -40°C to +150°C |
| Compatible Housing | 4644301298: COVER PLATE |
Compatibility
This OEM genuine part is specifically engineered for the ZF WG200 series transmissions, including the WG200, WG210, and WG220 variants. It is also compatible with select WG180 models that share the same valve body architecture. The 4644.183.058 LOOSE PARTS is often replaced during a full transmission rebuild alongside the 4644301298: COVER PLATE and the shift system components. For applications using the WG200 in heavy-duty trucks or construction equipment, always verify that your transmission serial number falls within the WG200 production range to ensure proper fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101223 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assemblies |
| 4644301225 | TRANSMISSION HOUSING | Secondary housing for valve body and oil passages |
| 0730365125 | TYPE PLATE | Identification plate with transmission model and serial number |
| 4644301298 | COVER PLATE | Seals the valve body cavity and retains internal components |
| 0634306525 | O-RING | Hydraulic seal for fluid passages and ports |
| 0636305026 | SCREW PLUG | Seals threaded access holes in the transmission housing |
| 4644301279 | SCREEN SHEET | Filter mesh for debris protection in oil circuits |
| 4644301088 | SEALING CAP | Protects sensor ports and hydraulic test points |
| 4644106300 | SHIFT SYSTEM | Electro-hydraulic module controlling gear selection |
| 4644306500 | COVER PLATE | Lower cover plate for oil pan or filter access |
