Overview
The ZF 4657.025.107 is a precision-engineered OEM genuine component designed specifically for the WG 190 Series transmission. This part functions as a critical internal guide and sealing element, ensuring proper oil flow and mechanical alignment within the gear train. As an original ZF part, it guarantees exact fitment and long service life. The SKU 4657.025.107 is the definitive reference for this specific variant, which is often installed alongside the HOUS.FRONT SECT (4657201132) to form the forward housing assembly. When replacing this unit, it is recommended to also inspect the CYLINDRICAL PIN (0631306816) for wear, as it secures the alignment of this part within the transmission casing.
Symptoms of Failure
When the ZF 4657.025.107 begins to degrade, operators will notice distinct operational issues. The most common symptom is oil seepage around the front bell housing, often mistaken for a main seal leak. A second clear indicator is intermittent gear engagement hesitation during low-speed maneuvers, caused by loss of hydraulic pressure. Third, you may hear a metallic rattling noise from the transmission front section during idle, indicating that the part has loosened. Finally, erratic shift timing under load is a long-tail search query that points directly to a failing internal guide component like this one. If you observe any of these signs, check the condition of the CAP SCREW (0636100801) and the FIXING PLATE (4656301148) which secure this assembly.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4657.025.107 |
| Material | High-grade aluminum alloy with steel insert |
| Weight | 1.85 kg (approx.) |
| Outer Diameter | 195 mm |
| Inner Diameter | 85 mm |
| Height | 62 mm |
| OEM Reference | ZF WG190 Series |
| Torque Spec | 45 Nm (when paired with CAP SCREW 0636100801) |
Compatibility
This part is primarily engineered for the ZF WG 190 Series transmission family. Based on its design and mounting pattern, it is also compatible with the WG180 and WG200 variants, provided the front housing assembly matches. It is not suitable for the older WG120 or WG150 series without modification. Always verify the casting numbers on your existing part against the SKU 4657.025.107. For complete assembly, you may also require the SCREEN SHEET (4657301032) or the OIL FEED.HOUSG. (0750301003) for optimal oil circulation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657201132 | HOUS.FRONT SECT | Front housing section for gear support |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing assembly |
| 0636100801 | CAP SCREW | Fastener for securing internal components |
| 4656301148 | FIXING PLATE | Retaining plate for bearing preload |
| 4657301032 | SCREEN SHEET | Oil filter screen for debris protection |
| 4657301033 | SCREEN SHEET | Alternate mesh filter screen |
| 0636100803 | CAP SCREW | Secondary fastener for cover plates |
| 0750301003 | OIL FEED.HOUSG. | Oil feed housing for lubrication circuit |
| 4656301023 | GASKET | Sealing gasket for oil containment |
| 0736300182 | TORX SCREW | Torx head screw for high-torque applications |
Frequently Asked Questions
Q: Can the ZF 4657.025.107 be installed without replacing the FIXING PLATE?
A: It is strongly recommended to replace the FIXING PLATE (4656301148) simultaneously, as the plate can become work-hardened and lose its clamping force, leading to premature failure of the new part.
Q: How do I identify if my WG190 uses this specific SKU?
A: Look for the stamped number “4657.025.107” on the outer circumference of the component. It is typically located near the oil feed port. If the number is worn, measure the outer diameter; 195 mm confirms it is this variant.
Q: Is the SCREEN SHEET mandatory for this assembly?
A: Yes, the SCREEN SHEET (4657301032) is required to prevent debris from entering the hydraulic circuit. Operating without it will void any warranty on the 4657.025.107.
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