Overview
The ZF 4656.171.078 is a precision-engineered OEM genuine part designed specifically for the WG 160 series transmission. This component plays a critical role in the hydraulic control circuit, ensuring proper fluid routing and pressure regulation during gear shifts. As an integral element of the valve body assembly, the 4656.171.078 directly influences shift quality and clutch engagement timing. When installed alongside the 4656101056: TRANSMISSION HOUSING, it forms a sealed unit that withstands high thermal and mechanical loads. The SKU 4656.171.078 is manufactured to ZF’s original tolerances, guaranteeing a direct fit without modification.
Symptoms of Failure
- Erratic shifting or delayed engagement: A worn 4656.171.078 can cause inconsistent hydraulic pressure, leading to harsh or delayed gear changes. This is a common search query for “ZF WG160 shift hesitation.”
- Internal fluid leaks: Degraded sealing surfaces allow transmission fluid to bypass internal passages, resulting in low line pressure and eventual slipping. Technicians often search for “ZF transmission oil leak between housing sections.”
- Unusual whining or buzzing noises: When this part loses its structural integrity, it can vibrate against the 4656201075: HOUS.FRONT SECT, producing audible noise during operation.
- Contamination in the oil pan: Material fatigue may release metallic debris into the fluid, accelerating wear on other components like the 4656201077: HOUSING REAR PART.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.171.078 |
| Material | Die-cast aluminum alloy (A380) |
| Weight | 0.85 kg (1.87 lbs) |
| Length | 142 mm |
| Width | 68 mm |
| Height | 32 mm |
| Sealing Type | Integrated O-ring groove |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF part is primarily engineered for the WG 160 series transmissions. Based on its design and mounting pattern, it is also compatible with the following ZF models: WG 180, WG 200, and WG 150. It directly interfaces with the 4656298049: HOUSING REAR SECTION to complete the hydraulic circuit. Always verify your transmission serial number before ordering to ensure correct fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101056 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4656201075 | HOUS.FRONT SECT | Front section housing the torque converter |
| 4656201077 | HOUSING REAR PART | Rear section supporting output shaft |
| 4656298049 | HOUSING REAR SECTION | End cover for hydraulic control unit |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 4656301148 | FIXING PLATE | Retains valve body components |
| 0636100817 | CAP SCREW | M8 fastener for housing assembly |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M6 fastener for cover plates |
Frequently Asked Questions
Q: Can I install the 4656.171.078 without replacing the housing gaskets?
It is strongly recommended to replace all sealing elements, including those on the 4656201077: HOUSING REAR PART, whenever this part is serviced. Reusing old gaskets risks immediate fluid leaks.
Q: How do I know if my WG160 needs this specific part?
If you experience low line pressure after inspecting the 4656101056: TRANSMISSION HOUSING for cracks, the 4656.171.078 is often the culprit. A pressure test of the valve body will confirm internal leakage.
Q: Is this part interchangeable with aftermarket versions?
Only OEM genuine parts like the 4656.171.078 guarantee the exact metallurgy and surface finish required for the WG series. Aftermarket copies often fail prematurely due to softer aluminum alloys.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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