Overview
The ZF 4657.025.123 is a precision-engineered OEM genuine component specifically designed for the WG 190 Series transmission. This part serves as a critical interface element within the transmission housing assembly, ensuring proper alignment and sealing between major structural sections. As an OEM genuine part, the SKU 4657.025.123 guarantees exact fitment and material composition that meets ZF’s original manufacturing tolerances. It sits directly between the main housing and the front section, acting as a load-bearing and fluid-containment element that prevents contamination ingress and maintains hydraulic pressure integrity throughout the transmission’s operational lifecycle.
Symptoms of Failure
- Transmission fluid seepage at housing joints — When the ZF 4657.025.123 degrades, operators often notice oil weeping from the seam between the main housing and front section, particularly under heavy load or after thermal cycling.
- Intermittent gear engagement hesitation — A worn part can cause slight misalignment of internal components, leading to delayed clutch pack engagement or a “soft” shift feel during acceleration.
- Abnormal vibration at specific RPM ranges — Loss of structural rigidity from a fatigued 4657.025.123 can transmit harmonic vibrations through the driveline, especially noticeable between 1200-1800 RPM under torque.
- Increased operating temperature — Compromised sealing allows hot transmission fluid to bypass cooling circuits, resulting in consistently higher sump temperatures and potential thermal degradation of adjacent seals.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4657.025.123 |
| Material | High-grade aluminum alloy (EN AC-42100) with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Overall Length | 187 mm |
| Overall Width | 94 mm |
| Overall Height | 32 mm |
| Bolt Hole Pattern | 6x M10 threaded, 120° spacing |
| Operating Temperature Range | -40°C to +120°C (-40°F to +248°F) |
| OEM Reference | ZF 4657.025.123 (Genuine) |
Compatibility
This ZF 4657.025.123 component is primarily engineered for the WG 190 Series transmission family. Based on its structural design and mounting configuration, it is also compatible with the following ZF models: WG 180, WG 200, WG 210, and WG 220 series transmissions manufactured between 2005 and 2023. The part interfaces directly with the TRANSMISSION HOUSING (4657101082) and the HOUS.FRONT SECT (4657201166). For complete assembly, it also mates with the HOUSING REAR PART (4657201170) and the HOUSING REAR SECTION (4657298102). Always verify your transmission serial number against ZF’s compatibility chart before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing that encloses gear sets and valve body |
| 4657201166 | HOUS.FRONT SECT | Forward section housing the torque converter and input shaft |
| 4657201170 | HOUSING REAR PART | Rear structural component supporting output shaft and bearings |
| 4657298102 | HOUSING REAR SECTION | Extended rear housing for PTO and auxiliary drive interfaces |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing-to-housing positioning |
| 0636100801 | CAP SCREW | M10 fastener for securing housing sections together |
| 4656301148 | FIXING PLATE | Retention bracket for securing internal oil passages |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic circuit debris protection |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump return line |
| 0636100803 | CAP SCREW | M12 fastener for high-torque housing connections |
Frequently Asked Questions
Q: Can the ZF 4657.025.123 be reused after a transmission rebuild?
A: ZF engineering recommends replacing this component with a new OEM genuine part during any major overhaul. The material undergoes stress relaxation over time, and reusing it may compromise sealing integrity and alignment precision.
Q: What torque specification should be used when installing this part?
A: For the 4657.025.123, ZF specifies a tightening torque of 45 Nm (33 ft-lbs) for the M10 bolts, applied in a cross-pattern sequence. Always consult the service manual for your specific WG 190 series variant.
Q: Does this part require any sealant during installation?
A: Yes, ZF recommends applying a thin, even layer of Loctite 518 or equivalent anaerobic flange sealant to both mating surfaces. Do not use RTV silicone, as it can clog internal oil passages.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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