Overview
The ZF 4657.183.400 LOOSE PARTS kit is a critical service assembly designed specifically for the WG 191 Series transmission. This genuine OEM part set contains the essential fasteners, seals, and small components required to secure and align the main structural casings of the gearbox. When rebuilding or servicing a WG191, this kit ensures that all loose hardware is replaced to factory torque specifications, preventing oil migration and maintaining driveline integrity. The SKU 4657.183.400 is often ordered alongside a new TRANSMISSION HOUSING to guarantee a complete seal between the front and rear sections of the transmission.
Symptoms of Failure
- External oil seepage at housing joints: Worn or missing loose parts can cause the HOUS.FRONT SECT to lose clamping force, leading to visible fluid leaks around the mating surface.
- Abnormal gear rattle or vibration: If the HOUSING REAR PART is not properly secured by these loose parts, internal bearing preload can shift, causing driveline noise under load.
- Misalignment during reassembly: A missing CYLINDRICAL PIN within this kit prevents accurate dowel alignment, making it impossible to achieve proper gear mesh after overhaul.
- Intermittent gear slipping: Loose fasteners from a degraded 4657.183.400 set can allow the valve body or clutch pack housing to shift slightly, causing momentary loss of hydraulic pressure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4657.183.400 |
| Material Composition | Steel (fasteners), Nitrile (seals), Zinc-plated hardware |
| Kit Contents | Bolts, dowel pins, lock washers, sealing rings |
| Weight (estimated) | 0.45 kg (1.0 lb) |
| OEM Reference | ZF 4657.183.400 |
| Thread Pitch (primary bolts) | M10 x 1.5 |
| Torque Specification | 45 Nm (33 ft-lb) dry |
Compatibility
This genuine ZF loose parts kit is engineered for the WG 191 Series transmission family. It is also compatible with the WG180 and WG200 series when used in conjunction with the correct TRANSMISSION HOUSING. The kit directly interfaces with the HOUS.FRONT SECT and the HOUSING REAR PART to restore factory clamping force. Always verify that the CYLINDRICAL PIN included in this set matches the dowel hole diameter of your specific transmission variant before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657301130 | HOUS.FRONT SECT | Front section housing for pump and converter |
| 4657301131 | HOUSING REAR PART | Rear section housing for output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636102489 | CAP SCREW | M10 bolt for housing retention |
| 4656301148 | FIXING PLATE | Locks bearing in position |
| 0636102463 | CAP SCREW | M8 bolt for cover plates |
| 4657201133 | SCREEN SHEET | Filter mesh for oil sump |
| 0636115287 | CAP SCREW | M12 bolt for heavy-duty joints |
| 4657301065 | PLATE | Spacer plate for clutch pack |
Frequently Asked Questions
Q: Can I reuse the old bolts from my WG191 instead of buying the 4657.183.400 kit?
A: ZF recommends against reusing torque-to-yield fasteners. The 4657.183.400 LOOSE PARTS kit provides fresh hardware with proper thread locking to prevent loosening under thermal cycling.
Q: Does this kit include the gaskets for the housing joints?
A: No, this kit contains only loose hardware (bolts, pins, washers). For sealing, you must order the appropriate gasket set separately. The HOUS.FRONT SECT typically requires a separate gasket.
Q: How do I know if the cylindrical pin in this kit fits my transmission?
A: The CYLINDRICAL PIN included in the 4657.183.400 set has an 8mm diameter. Verify this matches the dowel holes in your HOUSING REAR PART before assembly.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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