Overview
This OEM genuine ZF 4657.101.021 component is a critical internal part engineered specifically for the WG 190 Series transmission. It functions as a precision-machined guide and sealing element within the hydraulic control assembly, ensuring consistent oil pressure regulation during gear shifts. The SKU 4657.101.021 is manufactured to ZF’s original tolerances, guaranteeing a direct fit and long service life. When installed alongside the 0631306792: CYLINDRICAL PIN, it helps maintain alignment within the valve body, preventing cross-threading and premature wear.
Symptoms of Failure
- Erratic gear engagement or delayed shifting – When the 4657.101.021 wears, internal oil passages may become obstructed, causing hesitation when moving from neutral to drive or reverse.
- Visible oil seepage around the transmission housing – A worn sealing surface can allow ATF to escape, leaving puddles under the vehicle and reducing hydraulic pressure.
- Intermittent gear slipping under load – As the part degrades, the clutch pack may not receive adequate pressure, leading to momentary loss of power during acceleration.
- Unusual whining or grinding noises from the transmission – Metal-on-metal contact from a failing guide can produce audible sounds, especially at low speeds or during cold starts.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.101.021 |
| Material | Hardened steel with corrosion-resistant coating |
| Weight | 0.085 kg (approx.) |
| Outer Diameter | 22.5 mm |
| Length | 38.0 mm |
| OEM Reference | ZF 4657.101.021 |
| Sealing Type | Metal-to-metal with O-ring groove |
Compatibility
This genuine ZF part is primarily designed for the WG 190 Series transmission family. It is also compatible with the WG 180, WG 200, and WG 210 models where the same hydraulic control architecture is used. For proper installation, always pair this component with the 0636100801: CAP SCREW to secure the assembly, and use the 4656301148: FIXING PLATE to prevent axial movement. Additionally, the 4657301032: SCREEN SHEET should be inspected or replaced at the same time to ensure debris does not contaminate the new part.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631306792 | CYLINDRICAL PIN | Aligns valve body components |
| 0636100801 | CAP SCREW | Secures housing fasteners |
| 4656301148 | FIXING PLATE | Prevents part migration |
| 4657301032 | SCREEN SHEET | Filters hydraulic fluid |
| 4657301033 | SCREEN SHEET | Alternative mesh filter variant |
| 0636100803 | CAP SCREW | Longer thread fastener |
| 0750301003 | OIL FEED.HOUSG. | Directs oil to clutch packs |
| 4656301023 | GASKET | Seals mating surfaces |
| 0736300182 | TORX SCREW | High-torque fastener |
| 0736300233 | TORX SCREW | Alternate thread pitch fastener |
Frequently Asked Questions
Q: Can the 4657.101.021 be reused after removal?
A: No. This is a wear-critical component. ZF recommends replacing it with a new OEM part whenever the transmission is opened for service to ensure proper sealing and alignment.
Q: How do I know if this part fits my WG 190 transmission?
A: Check the transmission serial number against ZF’s compatibility chart. The 4657.101.021 is used in all WG 190 variants built after 2015, but earlier models may require a different revision.
Q: What torque should I use for the associated cap screws?
A: Always refer to the ZF service manual. For the 0636100801: CAP SCREW, the standard torque is 22 Nm. Over-tightening can distort the housing.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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