Overview
The ZF 4657.183.338 LOOSE PARTS kit is a critical service component designed specifically for the WG 191 series transmission. This genuine OEM assembly includes all necessary fasteners, seals, and small hardware required to secure and align the main transmission housing sections during overhaul or repair. The SKU 4657.183.338 is positioned at the core of the gearbox assembly, ensuring that the TRANSMISSION HOUSING maintains proper structural integrity under high torque loads. Without these loose parts, the transmission cannot maintain oil pressure or gear alignment, making this kit indispensable for any professional rebuild.
Symptoms of Failure
- External oil seepage at housing joints: When the 4657.183.338 loose parts degrade, you will notice oil weeping between the HOUS.FRONT SECT and the main case, especially after extended operation.
- Intermittent gear slippage under load: Worn or missing hardware from this kit can cause micro-movement between the HOUSING REAR PART and the clutch drum, leading to erratic shifting.
- Abnormal vibration during gear changes: A loose CYLINDRICAL PIN from this kit will produce a distinct rattling noise in the 2-3 shift range.
- Increased transmission operating temperature: Misalignment caused by failed loose parts restricts oil flow, causing the WG191 to run 15-20°F hotter than normal.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.183.338 |
| Kit Contents | Bolts, washers, pins, seals (approx. 18 pieces) |
| Material | Case-hardened steel (fasteners), nitrile rubber (seals) |
| Weight | 0.85 kg (1.87 lbs) |
| Thread Pitch | M8 x 1.25 (primary cap screws) |
| Torque Specification | 28 Nm (20.6 ft-lbs) for housing bolts |
| OEM Reference | ZF 4657.183.338 (genuine) |
Compatibility
This genuine ZF 4657.183.338 LOOSE PARTS kit is engineered for the WG 191 series transmission. It is also compatible with the WG180 and WG200 series gearboxes that share the same housing architecture. The kit directly interfaces with the TRANSMISSION HOUSING and the HOUS.FRONT SECT on all WG variants produced after 2008. For WG190 or WG210 models, verify the CYLINDRICAL PIN alignment before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural case for gearset |
| 4657301130 | HOUS.FRONT SECT | Front section of the housing assembly |
| 4657301131 | HOUSING REAR PART | Rear housing section for clutch pack |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing sections |
| 0636102489 | CAP SCREW | M8 bolt for housing fastening |
| 4656301148 | FIXING PLATE | Locks cap screws in position |
| 0636102463 | CAP SCREW | M6 bolt for accessory mounting |
| 4657201133 | SCREEN SHEET | Oil filter mesh for valve body |
| 0636115287 | CAP SCREW | M10 bolt for bell housing |
| 4657301065 | PLATE | Reinforcement plate for rear housing |
Frequently Asked Questions
Q: Can I reuse the old bolts from my WG191 instead of buying the 4657.183.338 kit?
A: No. ZF specifies that all fasteners in this kit are torque-to-yield and must be replaced during any housing disassembly to prevent stress fractures and oil leaks.
Q: Does this kit include the CYLINDRICAL PIN for alignment?
A: Yes. The 4657.183.338 LOOSE PARTS kit contains the CYLINDRICAL PIN (part 0631306816) along with all necessary cap screws and washers.
Q: Is this kit compatible with the WG180 transmission?
A: Yes, it fits WG180, WG191, and WG200 series transmissions that use the same HOUS.FRONT SECT design. Always verify your housing part number before ordering.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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