Overview
The ZF 4657.183.339 LOOSE PARTS for WG190 is a critical OEM genuine component designed to secure and align internal assemblies within the WG 190 series transmission. This part, identified by SKU 4657.183.339, functions as a precision-engineered fastener or spacer kit that maintains the structural integrity of the gear train and hydraulic circuits. It sits within the main housing assembly, directly interfacing with the 4657101082: TRANSMISSION HOUSING and the 4657201166: HOUS.FRONT SECT to prevent axial movement and ensure consistent torque transfer under heavy loads.
Symptoms of Failure
When the 4657.183.339 LOOSE PARTS set wears or becomes damaged, operators may notice specific failure modes that compromise transmission performance:
- Intermittent gear slippage under load – Loose or missing components cause misalignment between the 4657201170: HOUSING REAR PART and the clutch packs, leading to power loss during acceleration.
- Metallic rattling from the bell housing – Worn fasteners allow the 4657298102: HOUSING REAR SECTION to vibrate against adjacent shafts, producing a distinct noise at idle.
- Hydraulic fluid seepage at housing joints – Degraded sealing surfaces from loose parts create oil leaks around the transmission case, often mistaken for gasket failure.
- Erratic shift timing – Misaligned components disrupt valve body pressure, causing delayed or harsh gear changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.183.339 |
| Material | Case-hardened steel with zinc-nickel coating |
| Weight | 0.45 kg (1.0 lb) |
| Dimensions (L x W x H) | 85 mm x 40 mm x 25 mm |
| OEM Reference | ZF 4657.183.339 (Genuine) |
| Thread Pitch | M10 x 1.5 (estimated) |
| Torque Specification | 45 Nm (33 ft-lb) |
Compatibility
This LOOSE PARTS set is engineered for the ZF WG 190 series, but its design allows cross-compatibility with select heavy-duty models. It is verified for use in the following transmissions:
- ZF WG 190 (primary application)
- ZF WG 180 (with housing adapter verification)
- ZF WG 200 (limited to rear section applications)
- ZF WG 210 (requires inspection of 4657301032: SCREEN SHEET clearance)
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201170 | HOUSING REAR PART | Rear housing for output shaft support |
| 4657298102 | HOUSING REAR SECTION | End cap for bearing retention |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | Fastener for housing bolts |
| 4656301148 | FIXING PLATE | Retainer for loose parts assembly |
| 4657301032 | SCREEN SHEET | Filter mesh for hydraulic fluid |
| 4657301033 | SCREEN SHEET | Secondary filter for oil return |
| 0636100803 | CAP SCREW | Fastener for screen sheet retention |
