Overview
The ZF 4657.183.257 LOOSE PARTS kit is a critical service component designed for the WG 210 series transmission. This genuine OEM assembly contains the necessary fasteners, seals, and positioning elements that secure the transmission housing sections together. Located at the main casing interface, this loose parts set ensures structural integrity and prevents fluid migration between the TRANSMISSION HOUSING and the HOUS.FRONT SECT. The SKU 4657.183.257 is factory-matched to WG210 builds, guaranteeing correct thread pitch and material hardness for high-torque applications.
Symptoms of Failure
- Transmission oil seepage at housing seams — When the loose parts kit degrades, gasket compression fails, leading to visible wet spots around the HOUSING REAR PART joint.
- Abnormal gear engagement noise — Worn fasteners allow micro-movement between the HOUSING REAR SECTION and main casing, producing a metallic chatter during shifting.
- Intermittent pressure loss in hydraulic circuits — Loose bolts cause misalignment of internal oil galleries, resulting in delayed clutch pack engagement.
- Vibration at highway speeds — Deteriorated positioning pins allow the housing halves to shift, creating driveline imbalance.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4657.183.257 |
| OEM Reference | ZF WG210 Series |
| Material Composition | Case-hardened steel (fasteners) / Nitrile rubber (seals) |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (Kit) | 180 mm x 120 mm x 40 mm |
| Thread Specification | M10 x 1.5 (cap screws) / M6 x 1.0 (cylindrical pins) |
| Torque Rating | 45 Nm (cap screws) / 12 Nm (pins) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This 4657.183.257 loose parts kit is engineered for the ZF WG210 transmission series. It also cross-fits select models in the WG180 and WG200 families when used with the appropriate FIXING PLATE. The kit is not backward-compatible with pre-2005 WG160 units due to different bolt patterns. Always verify housing part numbers before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201170 | HOUSING REAR PART | Rear casing for output bearing support |
| 4657298102 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | M10 fastener for housing bolts |
| 4656301148 | FIXING PLATE | Locking plate for bolt retention |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil return |
| 4657301033 | SCREEN SHEET | Coarse mesh filter for suction line |
| 0636100803 | CAP SCREW | M8 fastener for cover plates |
