Overview
This OEM genuine ZF part, the ZF 4657.025.118, is a critical internal component designed 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 pressure regulation during gear shifts. The SKU 4657.025.118 sits directly adjacent to the main valve body, where it interfaces with the TRANSMISSION HOUSING to maintain structural alignment. Without this part, the transmission cannot maintain consistent clutch engagement, leading to operational instability.
Symptoms of Failure
When the 4657.025.118 wears out, operators often notice intermittent gear slipping under load, a common long-tail search query for WG190 issues. A second clear symptom is erratic shift timing, where the transmission hesitates or harshly engages between gears. Third, you may observe low hydraulic pressure warnings on the dashboard, as the worn part fails to seal properly. Finally, visible metal debris in the oil pan indicates that this component has begun to fracture, requiring immediate replacement to avoid damage to the HOUS.FRONT SECT.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (OEM) | 4657.025.118 |
| Material | Hardened Steel Alloy |
| Weight | 0.45 kg (approx.) |
| Length | 85 mm |
| Width | 40 mm |
| Height | 25 mm |
| OEM Reference | ZF 4657.025.118 |
| Surface Treatment | Phosphate Coated |
Compatibility
This part is engineered for the ZF WG 190 Series transmission family. It is also compatible with the closely related WG 180 and WG 200 models, which share the same hydraulic circuit architecture. For proper installation, ensure the HOUSING REAR PART and HOUSING REAR SECTION are free from scoring. Always verify your transmission serial number against the WG190 parts catalog before ordering.
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 |
| 4657201170 | HOUSING REAR PART | Rear housing segment for output support |
| 4657298102 | HOUSING REAR SECTION | Secondary rear housing cover |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing mating |
| 0636100801 | CAP SCREW | Fastener for housing sections |
| 4656301148 | FIXING PLATE | Retains internal components in position |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil debris |
| 4657301033 | SCREEN SHEET | Secondary filter screen for hydraulic circuit |
| 0636100803 | CAP SCREW | High-torque fastener for valve body |
Frequently Asked Questions
Q: Can I install the 4657.025.118 without removing the transmission?
A: No. This part is located deep within the hydraulic control unit, requiring removal of the oil pan and valve body. We recommend dropping the transmission for full access.
Q: How do I know if my WG190 needs this specific part?
A: Check for the symptoms listed above, particularly erratic shifting and low pressure. Cross-reference your transmission serial number with the WG190 parts diagram to confirm the 4657.025.118 is used in your build.
Q: Is this part interchangeable with any aftermarket versions?
A: We strongly advise using only OEM genuine ZF parts. Aftermarket versions often lack the precise tolerances required for proper sealing, leading to premature failure of the HOUS.FRONT SECT.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
