Overview
The ZF 4657.183.120 LOOSE PARTS assembly is a critical service kit designed specifically for the WG 210 series transmission. This OEM genuine part set contains the essential hardware and small components required to secure and align internal transmission assemblies during rebuilds or major repairs. Positioned within the main gear train housing, these loose parts ensure that larger structural elements like the 4657101039: TRANSMISSION HOUSING and the 4657201028: HOUS.FRONT SECT remain properly fastened under high torque loads. The SKU 4657.183.120 is factory-sealed and includes all necessary washers, bolts, and retainers to restore factory tolerances in the WG210 gearbox.
Symptoms of Failure
- Transmission housing oil seepage at mating flanges: When the loose parts kit components degrade, the seal between the 4657201013: HOUSING REAR PART and the main housing can fail, leading to visible oil weeping around bolt heads.
- Audible rattling or loose internal components: Worn or missing 0631306792: CYLINDRICAL PIN elements from this kit can cause misalignment, producing a distinct metallic chatter during gear engagement.
- Gradual gear slippage under load: If the fasteners in this kit lose clamping force, the front section housing can shift slightly, reducing hydraulic pressure to clutches and causing delayed engagement.
- Vibration at highway speeds: A compromised loose parts set allows micro-movement between the housing sections, transmitting vibration through the driveline.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.183.120 |
| OEM Reference | ZF WG210 Series |
| Material Composition | Steel (fasteners), Nitrile (seals) |
| Weight (approx.) | 0.85 kg (1.87 lbs) |
| Dimensions (packaged) | 180 x 120 x 40 mm |
| Included Components | Bolts, washers, cylindrical pins, retaining clips |
| Torque Specification | Refer to ZF service manual for WG210 |
Compatibility
This genuine ZF 4657.183.120 loose parts kit is engineered for the WG 210 series, but its fastening hardware is also shared with the WG180 and WG200 transmission families due to common housing bolt patterns. It is not compatible with older WG120 or WG150 models without adapter plates. Always verify that your transmission serial number falls within the WG210 range before ordering. The kit works in conjunction with the 4657101039: TRANSMISSION HOUSING and the 4657201028: HOUS.FRONT SECT to maintain structural integrity.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101039 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201028 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201013 | HOUSING REAR PART | Rear housing section for output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for housing mating |
| 0636100801 | CAP SCREW | Fastener for housing flanges |
| 4656301148 | FIXING PLATE | Retention plate for bearing assembly |
| 4657301034 | SCREEN SHEET | Filter screen for oil circuit |
| 4657301035 | SCREEN SHEET | Secondary filter screen |
| 0636100803 | CAP SCREW | Alternate flange fastener |
| 4681301040 | OIL FEED.HOUSG. | Oil feed housing for lubrication |
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