Overview
The ZF 4657.183.255 LOOSE PARTS set is a critical OEM genuine service kit designed specifically for the WG 190 series transmission. This assembly consolidates essential fasteners, seals, and positioning components that secure internal hydraulic circuits and structural elements within the gearbox. As a loose parts package, it replaces worn or missing hardware that can compromise the integrity of the transmission housing assembly. The SKU 4657.183.255 is frequently ordered alongside major structural components such as the 4657101082: TRANSMISSION HOUSING to ensure a complete rebuild. Without this kit, even a perfectly machined housing cannot guarantee leak-free operation or proper gear alignment.
Symptoms of Failure
- Oil seepage at housing joints: When the loose parts in this kit degrade, you may notice fluid weeping from the seam between the 4657201166: HOUS.FRONT SECT and the main casing, indicating compromised sealing hardware.
- Intermittent gear slippage under load: Worn fasteners can allow micro-movement of the 4657201170: HOUSING REAR PART, leading to misalignment of clutch packs and erratic power delivery.
- Abnormal vibration during shifting: Loose retaining elements cause the 4657298102: HOUSING REAR SECTION to shift slightly, producing a distinct shudder during gear changes.
- Increased transmission noise: Missing or fatigued positioning pins allow internal components to rattle, creating a metallic chatter that worsens with temperature.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4657.183.255 |
| Material Composition | Steel alloy with zinc-nickel plating (fasteners); nitrile rubber (seals) |
| Weight (approx.) | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4657.183.255 (Genuine) |
| Compatible Series | WG 190, WG 180, WG 200 |
| Included Components | Bolts, dowel pins, sealing washers, retaining clips |
Compatibility
This loose parts kit is engineered primarily for the ZF WG 190 series, but its hardware dimensions also suit the WG 180 and WG 200 transmissions due to shared housing bolt patterns. It is commonly used during overhaul of the 4657101082: TRANSMISSION HOUSING and when replacing the 4657201166: HOUS.FRONT SECT. For full compatibility verification, always cross-reference the original part number with your transmission’s serial plate. The kit does not fit the WG 210 series without adapter modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section of transmission housing |
| 4657201170 | HOUSING REAR PART | Rear housing segment for output shaft |
| 4657298102 | HOUSING REAR SECTION | End cap housing for bearing support |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | High-tensile fastener for housing bolts |
| 4656301148 | FIXING PLATE | Retainer plate for valve body |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M10 flange bolt for rear housing |
