Overview
The ZF 4657.183.194 LOOSE PARTS for WG190 is a critical service kit designed to restore the internal integrity of your ZF WG 190 series transmission. This OEM genuine part set contains the specific fasteners, seals, and positioning elements required to secure the main housing assembly during a rebuild or overhaul. The SKU 4657.183.194 is typically installed after the main transmission case has been split, ensuring that the TRANSMISSION HOUSING and its adjoining sections are correctly torqued and aligned. Without this loose parts kit, the internal clearances for the planetary gear sets cannot be maintained, leading to premature wear.
Symptoms of Failure
When the components within the ZF 4657.183.194 kit begin to fail or are omitted during service, operators will notice distinct operational issues. Look for these specific failure symptoms to identify a need for replacement:
- Transmission oil leaks at the housing seam: Worn or missing fasteners from the loose parts kit allow the HOUS.FRONT SECT to separate slightly, causing fluid seepage under load.
- Gear slipping under heavy torque: If the HOUSING REAR PART is not properly secured by the hardware in this kit, the clutch packs can lose clamping force, resulting in intermittent slippage.
- Abnormal vibration or driveline noise: A loose CYLINDRICAL PIN (included in the 4657.183.194 set) can cause misalignment between the pump housing and the main case, generating a distinct low-frequency hum.
- Hard shifting or delayed engagement: Loss of structural rigidity from degraded loose parts can alter the hydraulic circuit paths, leading to harsh or delayed gear changes.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4657.183.194 |
| Material Composition | Steel (fasteners), Nitrile (seals), Zinc-plated hardware |
| Kit Weight (estimated) | 0.45 kg (1.0 lb) |
| Primary Application | ZF WG 190 Series |
| Included Components | Bolts, washers, cylindrical pins, sealing rings |
| OEM Reference | ZF 4657.183.194 (Genuine) |
Compatibility
This OEM genuine loose parts kit is engineered specifically for the ZF WG 190 series, but its hardware is also shared across several related heavy-duty transmission models. The 4657.183.194 is directly compatible with the WG180, WG190, and WG200 series transmissions used in off-highway trucks, wheel loaders, and agricultural tractors. It is also suitable for the WG 150 and WG 210 variants when replacing the TRANSMISSION HOUSING or the HOUS.FRONT SECT. Always verify the serial number of your transmission before ordering to ensure correct fitment.
Related Components
These additional parts are frequently ordered alongside the 4657.183.194 LOOSE PARTS kit to complete a full transmission rebuild or housing replacement.
| Part Number | Name | Function |
|---|---|---|
| 4657101031 | TRANSMISSION HOUSING | Main structural case for the gear train |
| 4657201027 | HOUS.FRONT SECT | Front section housing the pump and converter |
| 4657201020 | HOUSING REAR PART | Rear section supporting the output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for housing doweling |
| 0636100801 | CAP SCREW | High-tensile fastener for housing bolts |
| 4656301148 | FIXING PLATE | Retaining plate for clutch pack assembly |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump |
| 0636100803 | CAP SCREW | Fastener for valve body mounting |
| 4681301040 | OIL FEED.HOUSG. | Housing for oil feed tube to clutch |
Frequently Asked Questions
Q: Is the ZF 4657.183.194 kit reusable after disassembly?
No. The fasteners and seals in this loose parts kit are designed for single-use only. Reusing them can lead to torque loss and oil leaks. Always install a new 4657.183.194 kit whenever the transmission housing is separated.
Q: Can I use this kit on a ZF WG180 transmission?
Yes. The 4657.183.194 is fully compatible with the WG180, WG190, and WG200 series. It contains the specific hardware required to secure the HOUSING REAR PART and front sections.
Q: What tools are needed to install the 4657.183.194 parts?
Installation requires a torque wrench capable of 80-120 Nm, a hex key set, and a soft-faced mallet for seating the CYLINDRICAL PIN. Refer to the ZF service manual for exact torque specifications.
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