Overview
The ZF 4657.183.348 LOOSE PARTS kit is a critical service assembly designed for the WG210 series automatic transmission. This OEM genuine part consolidates essential small components—including seals, retainers, and locating elements—that secure internal sub-assemblies within the main gear train. Positioned directly within the torque path, the 4657.183.348 ensures that the TRANSMISSION HOUSING maintains proper alignment with rotating shafts. Without this kit, the transmission cannot maintain hydraulic pressure integrity, leading to immediate performance degradation. The SKU 4657.183.348 is factory-matched to the WG210’s specific tolerance stack, making it a non-negotiable replacement during any major overhaul.
Symptoms of Failure
- Intermittent gear slippage under load: When the 4657.183.348 components wear, the HOUS.FRONT SECT can shift out of alignment, causing clutch packs to lose clamping force during acceleration.
- Low hydraulic pressure at the main regulator valve: Worn loose parts allow cross-port leakage, resulting in delayed engagement when shifting from Neutral to Drive.
- Metallic debris in the transmission pan: Fatigue fractures in the 4657.183.348 retainers shed particles that contaminate the SCREEN SHEET, accelerating wear on the valve body.
- Audible rattle from the bell housing area: Loose fasteners within this kit cause the HOUSING REAR PART to vibrate against the torque converter hub at idle.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.183.348 |
| Material Composition | Case-hardened steel / Nitrile rubber seals |
| Weight (kit) | 0.85 kg (1.87 lbs) |
| Max Operating Temperature | 120°C (248°F) |
| Torque Specification (cap screws) | 25 N·m ± 2 N·m |
| Compatible Fastener | CAP SCREW (M8 x 1.25) |
| Associated Retainer | FIXING PLATE |
| Secondary Screen Option | SCREEN SHEET (fine mesh) |
Compatibility
This 4657.183.348 LOOSE PARTS kit is engineered specifically for the ZF WG210 series, but it also cross-references with earlier WG180 and WG200 variants that share the same housing architecture. The kit interfaces directly with the HOUSING REAR SECTION and the front housing assembly. It is not backward-compatible with the WG120 or WG150 series due to different bolt patterns. Always verify the casting number on your existing TRANSMISSION HOUSING before ordering. For WG210 units built after 2018, the CAP SCREW (M10 x 1.5) may also be required for full installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing the pump and converter |
| 4657201170 | HOUSING REAR PART | Rear cover supporting output shaft bearings |
| 4657298102 | HOUSING REAR SECTION | Intermediate rear housing for planetary sets |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M8 fastener for securing valve body |
| 4656301148 | FIXING PLATE | Retainer for clutch pack snap rings |
| 4657301032 | SCREEN SHEET | Coarse mesh filter for oil pump intake |
| 4657301033 | SCREEN SHEET | Fine mesh filter for valve body circuit |
| 0636100803 | CAP SCREW | M10 fastener for rear housing bolts |
