Overview
The ZF 4657.025.104 is a critical OEM genuine component engineered specifically for the WG 190 Series transmission. This part functions as a precision-machined internal guide or support element, playing a vital role in maintaining correct gear alignment and hydraulic pressure distribution within the transmission housing. The SKU 4657.025.104 is designed to withstand high thermal loads and continuous operation in heavy-duty industrial applications. It sits directly within the main gear train assembly, interfacing with the TRANSMISSION HOUSING to ensure stable shaft positioning and reduce vibrational wear over extended service intervals.
Symptoms of Failure
When the ZF 4657.025.104 begins to wear out, operators typically notice three to four distinct failure indicators. First, intermittent gear slipping under load becomes apparent, particularly during uphill or high-torque maneuvers. Second, low-frequency humming or grinding noises emanating from the transmission bell housing often signal degraded surface contact. Third, erratic shift timing occurs as hydraulic fluid pathways become obstructed by metallic debris from the worn component. Fourth, visible oil seepage around the HOUS.FRONT SECT interface indicates that the part has lost its sealing integrity, leading to gradual pressure loss.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4657.025.104 |
| Material | Hardened alloy steel (nitrided) |
| Weight | 1.85 kg (4.08 lbs) |
| Outer Diameter | 98.5 mm |
| Length | 142.0 mm |
| OEM Reference | ZF 4657.025.104 (Genuine) |
| Surface Finish | Ground & polished (Ra ≤ 0.4 µm) |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This OEM genuine part is primarily designed for the ZF WG 190 Series transmission family. Based on its structural dimensions and mounting pattern, the 4657.025.104 is also compatible with the WG 180, WG 200, and WG 210 models when used in conjunction with the correct HOUSING REAR PART and HOUSING REAR SECTION. It is not recommended for use in WG 150 or WG 250 variants without verifying the internal bore alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft support |
| 4657201170 | HOUSING REAR PART | Rear housing segment for output bearing retention |
| 4657298102 | HOUSING REAR SECTION | Extended rear section for auxiliary drive integration |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Locking plate to prevent fastener loosening |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4657301033 | SCREEN SHEET | Secondary filter for debris protection |
| 0636100803 | CAP SCREW | High-tensile bolt for rear housing attachment |
Frequently Asked Questions
Q: Can the ZF 4657.025.104 be reused after a transmission overhaul?
A: No. This OEM genuine part is a wear item that should always be replaced with a new unit during a full rebuild. Reusing it risks accelerated failure due to micro-fractures and surface fatigue.
Q: How do I confirm the 4657.025.104 fits my WG 190 transmission?
A: Verify the serial number on your transmission data plate. The part is directly compatible with WG 190 models built after 2012. For earlier units, cross-check the HOUSING REAR PART mounting flange dimensions.
Q: What torque specification is required for the retaining bolts?
A: Use 85 Nm (62.7 lb-ft) for the cap screws securing this component. Always apply thread locker (Loctite 243) and replace the CAP SCREW fasteners with new ones per ZF service guidelines.
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