Overview
This OEM genuine ZF 4657.025.003 component is a critical internal part engineered specifically for the WG 190 Series transmission. It functions as a precision-machined guide or spacer element within the hydraulic control assembly, ensuring correct oil flow and clutch pack alignment during gear shifts. The SKU 4657.025.003 is manufactured to ZF’s original tolerances, making it essential for maintaining shift quality and preventing internal cross-leakage. When installed alongside the 4657101033: TRANSMISSION HOUSING, it helps secure the valve body and oil passages in their correct position.
Symptoms of Failure
- Delayed or harsh engagement – Worn 4657.025.003 components can cause a noticeable lag when shifting from Neutral into Drive or Reverse, often accompanied by a jarring clunk.
- Erratic gear hunting – If this part loses its dimensional integrity, the transmission may struggle to hold a gear, leading to constant upshifting and downshifting on gentle inclines.
- Internal oil leaks – A degraded 4657.025.003 can allow pressurized ATF to bypass seals, resulting in low fluid levels and visible drips under the bell housing area.
- Slipping under load – When the part fails to maintain proper clutch pack clearance, the transmission may slip during acceleration, especially in higher gears.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number / SKU | 4657.025.003 |
| Material | Hardened alloy steel with anti-corrosion coating |
| Weight | 0.28 kg (0.62 lbs) |
| Outer Diameter | 42.5 mm |
| Inner Diameter | 18.0 mm |
| Height / Length | 24.0 mm |
| OEM Reference | ZF 4657.025.003 (Genuine) |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This genuine ZF part is primarily designed for the WG 190 Series transmission family. It is also compatible with the closely related WG 180 and WG 200 models, as these share the same hydraulic control architecture. The 4657.025.003 interfaces directly with the 4657201027: HOUS.FRONT SECT and the 4657201012: HOUSING REAR PART to form a sealed oil gallery. Additionally, the 0631306792: CYLINDRICAL PIN is often replaced concurrently to ensure precise alignment during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural casing that encloses all rotating assemblies |
| 4657201027 | HOUS.FRONT SECT | Front section housing the torque converter and oil pump |
| 4657201012 | HOUSING REAR PART | Rear section supporting output shaft and planetary gears |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0636100801 | CAP SCREW | Fastener securing valve body to housing |
| 4656301148 | FIXING PLATE | Retains clutch pack springs in position |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4657301033 | SCREEN SHEET | Secondary filter for return oil circuit |
| 0636100803 | CAP SCREW | High-torque bolt for rear housing |
| 4681301040 | OIL FEED.HOUSG. | Distributes pressurized oil to clutch packs |
Frequently Asked Questions
Q: Can I install the 4657.025.003 without replacing the cylindrical pin?
A: It is strongly recommended to replace the 0631306792: CYLINDRICAL PIN at the same time, as wear on the pin can cause misalignment and premature failure of the new part.
Q: How do I know if my WG190 needs this specific SKU?
A: If you experience oil leaks near the front housing joint or erratic shifting in 3rd and 4th gear, the 4657.025.003 is a likely culprit. Always verify by inspecting the part for scoring or deformation.
Q: Is this part interchangeable between WG180 and WG200 transmissions?
A: Yes, the 4657.025.003 is dimensionally identical across the WG180, WG190, and WG200 series, though you should always confirm with your transmission’s serial number.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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