Overview
The ZF 4657.183.303 LOOSE PARTS set is a critical service kit designed for the WG 190 series transmission. This OEM genuine assembly contains the specific fasteners, seals, and small components required to secure and seal the main housing sections during a rebuild or overhaul. Positioned at the interface between the TRANSMISSION HOUSING and the HOUS.FRONT SECT, this kit ensures proper clamping force and fluid containment. The SKU 4657.183.303 is a direct factory replacement, eliminating guesswork during transmission reassembly.
Symptoms of Failure
- External oil seepage at housing joints: When the loose parts (bolts, washers, or sealing elements) degrade, you may notice fluid weeping between the main housing and the HOUSING REAR PART.
- Transmission gear slipping under load: Worn fasteners can allow slight housing separation, reducing hydraulic pressure and causing clutch pack slip during torque conversion.
- Vibration or rattle from the bell housing area: Loose or missing components in this kit can lead to inadequate clamping, resulting in metallic chatter at idle or low RPM.
- Contaminated transmission fluid: A compromised seal from degraded loose parts allows dirt ingress, often detected by gritty residue on the dipstick or filter.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4657.183.303 |
| OEM Reference | ZF WG 190 Series |
| Material Composition | Steel alloy (fasteners) / Nitrile rubber (seals) |
| Weight (approx.) | 0.45 kg (1.0 lb) |
| Kit Contents | Bolts, washers, dowel pins, sealing rings |
| Thread Pitch | M10 x 1.5 (primary fasteners) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This loose parts kit is engineered for the ZF WG 190 series, but it also fits adjacent models sharing the same housing architecture. Compatible transmissions include the WG 180, WG 190, and WG 200 series. The kit is specifically validated for use with the HOUSING REAR SECTION and the main housing assembly. Always verify your transmission serial number before ordering.
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 segment for output flange |
| 4657298102 | HOUSING REAR SECTION | Alternate rear housing casting variant |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | M10 fastener for housing attachment |
| 4656301148 | FIXING PLATE | Retainer plate for bearing preload |
| 4657301032 | SCREEN SHEET | Filter mesh for oil pump intake |
| 4657301033 | SCREEN SHEET | Secondary filter screen for valve body |
| 0636100803 | CAP SCREW | M12 fastener for heavy-duty clamping |
