Overview
The ZF 4657.183.368 LOOSE PARTS kit is a critical service component designed for the WG 190 series transmission. This OEM genuine assembly contains the specific fasteners, seals, and small hardware required to secure internal sub-assemblies within the gear train. Positioned between the main housing and the rear section, this kit ensures proper clamping force and alignment of planetary gearsets. The SKU 4657.183.368 is frequently ordered during a full overhaul to replace single-use bolts and locking elements that cannot be reused after disassembly. Without this loose parts set, reassembly of the transmission housing is incomplete, risking internal clearance issues.
Symptoms of Failure
- Oil seepage from housing joints: When the fasteners in the 4657.183.368 kit lose their torque retention, transmission fluid can weep between the HOUS.FRONT SECT and the main casing, leaving visible drips on the bell housing.
- Intermittent gear slippage under load: Worn or stretched cap screws in this loose parts set allow micro-movement of the HOUSING REAR PART, causing clutch packs to lose hydraulic pressure during heavy torque application.
- Metallic rattling from the transmission tunnel: Loose fixing plates or pins from this kit can vibrate against the HOUSING REAR SECTION, producing a distinct chatter that worsens on deceleration.
- Difficulty engaging reverse gear: Degraded alignment pins in the 4657.183.368 set prevent the TRANSMISSION HOUSING from seating correctly, leading to a grinding sensation when shifting into reverse.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.183.368 |
| Material Composition | Case-hardened steel (fasteners), Nitrile rubber (seals) |
| Weight (approx.) | 0.45 kg (1.0 lb) |
| Dimensions (L x W x H) | 120 mm x 80 mm x 30 mm |
| Torque Specification | 45 Nm (33 ft-lb) for cap screws |
| OEM Reference | ZF 4657.183.368 (Genuine) |
| Thread Pitch | M8 x 1.25 (primary fasteners) |
Compatibility
This loose parts kit is engineered specifically for the ZF WG 190 series, but it also cross-fits several adjacent transmission models that share the same housing architecture. Compatible units include the WG 180, WG 200, and the earlier WG 150 series when retrofitted with updated hardware. The 4657.183.368 set is not compatible with the WG 210 or Ecomat series due to different bolt patterns. Always verify the housing casting number against the TRANSMISSION HOUSING before ordering. For mixed-model fleets, this kit is a universal fit for any ZF transmission using the 4657 prefix housing group.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section of the transmission housing |
| 4657201170 | HOUSING REAR PART | Rear housing component for output shaft |
| 4657298102 | HOUSING REAR SECTION | Secondary rear housing section |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | M8 fastener for housing bolts |
| 4656301148 | FIXING PLATE | Locking plate for bolt retention |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh filter for sump |
| 0636100803 | CAP SCREW | M10 fastener for rear housing |
