Overview
The ZF 4657.025.112 is a precision-engineered internal component designed specifically for the WG 190 series transmission. This OEM genuine part plays a critical role in managing hydraulic flow and pressure regulation within the gearbox, ensuring smooth clutch engagement and consistent torque delivery. As a direct replacement for worn units, the SKU 4657.025.112 restores factory performance and reliability. It is frequently installed alongside the 4657101082: TRANSMISSION HOUSING, which provides the structural foundation for the entire assembly.
Symptoms of Failure
- Delayed or harsh shifting: When the 4657.025.112 wears, you may notice a pronounced lag between gear changes or abrupt engagement, often described as “ZF transmission shift hesitation.”
- Intermittent gear slipping under load: A failing unit can cause the transmission to momentarily lose power during acceleration, a classic sign of internal pressure loss.
- Hydraulic fluid contamination: Debris from a degraded 4657.025.112 can circulate through the system, leading to “ZF transmission metal shavings in oil” and accelerated wear on adjacent parts.
- Audible whining or grinding: As tolerances increase, you may hear a high-pitched noise from the transmission housing, particularly when the vehicle is in motion.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number (SKU) | 4657.025.112 |
| OEM Reference | ZF 4657.025.112 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Length | 142 mm |
| Outer Diameter | 58 mm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This OEM genuine part is engineered for the ZF WG 190 series transmission. It is also compatible with the WG 180 and WG 200 variants, as these models share a common hydraulic control architecture. For complete assembly, ensure the 4657201166: HOUS.FRONT SECT and 4657201170: HOUSING REAR PART are inspected for wear during replacement. The 4657298102: HOUSING REAR SECTION also interfaces directly with this component.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201170 | HOUSING REAR PART | Rear housing section for output assembly |
| 4657298102 | HOUSING REAR SECTION | Additional rear housing segment |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | Fastener for housing sections |
| 4656301148 | FIXING PLATE | Secures internal components |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4657301033 | SCREEN SHEET | Secondary mesh filter element |
| 0636100803 | CAP SCREW | Fastener for filter assembly |
Frequently Asked Questions
Q: How do I know if the 4657.025.112 is the correct replacement for my WG190?
A: Verify your transmission model number on the data plate. This part is specifically designed for WG 190, WG 180, and WG 200 series units. Cross-reference the SKU with your existing part number before ordering.
Q: Can I replace this part without removing the entire transmission?
A: In most cases, partial disassembly of the transmission housing is required. Accessing the 4657.025.112 typically involves removing the 4657201166: HOUS.FRONT SECT and draining the hydraulic fluid. Professional installation is recommended.
Q: What other parts should I replace at the same time?
A: It is prudent to replace all seals, gaskets, and the 4657301032: SCREEN SHEET to prevent contamination from debris. Inspect the 4657101082: TRANSMISSION HOUSING for cracks or scoring.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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