Overview
This genuine OEM ZF 4657.183.148 LOOSE PARTS kit is a critical service component designed specifically for the WG 190 series transmission. It contains the essential fasteners, seals, and small hardware required to secure and align internal assemblies during a rebuild or major repair. The SKU 4657.183.148 is typically installed in the clutch housing and main case junction, ensuring that the TRANSMISSION HOUSING and HOUS.FRONT SECT remain properly torqued and vibration-resistant. Without this loose parts set, the structural integrity of the gear train is compromised, leading to misalignment and accelerated wear.
Symptoms of Failure
- Transmission oil leaks at the housing seam: When the fasteners in the 4657.183.148 kit fatigue or are lost, the seal between the HOUSING REAR PART and the main case fails, causing fluid seepage.
- Gear slipping under load: Worn or missing CYLINDRICAL PIN components within the kit allow the housing halves to shift, reducing clutch pack engagement pressure.
- Abnormal driveline vibration: Loose hardware from this set creates micro-movement between the transmission housing sections, producing a low-frequency shudder during acceleration.
- Difficulty shifting into gear: Misalignment caused by degraded loose parts prevents the shift rails from moving freely, resulting in a hard or delayed shift feel.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.183.148 |
| Material Composition | Hardened Steel / Zinc-Plated Alloy |
| Weight (approx.) | 0.45 kg (1.0 lb) |
| Dimensions (L x W x H) | 120 mm x 80 mm x 25 mm |
| OEM Reference | ZF 4657.183.148 |
| Thread Size (primary bolts) | M10 x 1.5 |
| Torque Specification | 45 Nm (33 ft-lbs) |
Compatibility
This genuine ZF 4657.183.148 LOOSE PARTS kit is engineered for the WG 190 series, but it also fits select models in the WG 180, WG 200, and WG 210 families due to shared housing architecture. It is commonly used in ZF WG 190, WG 180, and WG 200 transmissions found in heavy-duty trucks, buses, and off-highway equipment. Always verify your transmission serial number against the OEM parts list before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural case for gear and shaft support |
| 4657201027 | HOUS.FRONT SECT | Front section housing for input shaft and bearings |
| 4657201012 | HOUSING REAR PART | Rear housing section for output shaft assembly |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for precise housing positioning |
| 0636100801 | CAP SCREW | Fastener for securing housing flanges |
| 4656301148 | FIXING PLATE | Retainer plate for clutch pack positioning |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil circuit protection |
| 4657301033 | SCREEN SHEET | Secondary filter screen for high-pressure circuits |
| 0636100803 | CAP SCREW | High-tensile bolt for critical joints |
| 4681301040 | OIL FEED.HOUSG. | Lubrication supply housing for gear train |
Frequently Asked Questions
Q: Can I reuse the old fasteners from my WG190 instead of buying the 4657.183.148 kit?
A: ZF strongly discourages reusing hardware due to thread fatigue and stretch. The 4657.183.148 LOOSE PARTS kit includes new, pre-coated fasteners that meet OEM torque specifications for a leak-free seal.
Q: Does this kit include the CYLINDRICAL PIN for alignment?
A: Yes, the 4657.183.148 set contains the CYLINDRICAL PIN (0631306792) necessary for aligning the HOUS.FRONT SECT with the main case.
Q: Will this part work on a ZF WG180 transmission?
A: The 4657.183.148 is primarily designed for the WG190, but it is physically compatible with the WG180 and WG200 series due to shared housing bolt patterns. Always cross-reference your transmission model number before ordering.
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