Overview
This OEM genuine ZF 4656.056.017 is a critical internal component specifically engineered for the WG 160 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 4656.056.017 is manufactured to ZF’s exacting tolerances, making it an essential part for maintaining shift quality and preventing internal cross-leakage. When installed alongside the 4656201075: HOUS.FRONT SECT and the 4656201035: HOUSING REAR PART, it completes the main structural integrity of the valve body assembly.
Symptoms of Failure
When the 4656.056.017 component begins to wear, operators will notice distinct performance degradation. The most common failure symptoms include:
- Erratic shift timing and gear slipping: Worn surfaces cause inconsistent hydraulic pressure, leading to delayed or harsh engagements.
- Internal oil leaks within the transmission housing: Degraded sealing surfaces allow ATF to bypass the intended circuits, often resulting in low line pressure.
- Persistent transmission overheating: Incorrect oil routing forces the torque converter to work harder, generating excess heat.
- Neutral or no-move conditions in forward gears: Complete failure of this part can block oil passages, preventing clutch pack application.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4656.056.017 |
| Material | Hardened Steel / Sintered Metal Alloy |
| Weight | 0.45 kg (approx.) |
| Outer Diameter | 68.5 mm |
| Inner Diameter | 42.0 mm |
| Height / Thickness | 18.2 mm |
| Surface Finish | Ground / Phosphate Coated |
| OEM Reference | ZF WG 160 Series |
Compatibility
This genuine ZF part is primarily designed for the WG 160 transmission series. Based on its structural role, it is also compatible with the following ZF models that share a similar valve body architecture: WG 180, WG 200, and WG 150. It is frequently replaced in conjunction with the 4472239178: HOUSING REAR PART and the 0631306816: CYLINDRICAL PIN to ensure proper alignment during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656201075 | HOUS.FRONT SECT | Front section of the main housing assembly |
| 4656201035 | HOUSING REAR PART | Rear housing component for valve body |
| 4472239178 | HOUSING REAR PART | Alternate rear housing variant |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing assembly |
| 0636100817 | CAP SCREW | Fastener for securing housing sections |
| 4656301016 | SCREEN SHEET | Filter screen for hydraulic fluid |
| 4656301017 | SCREEN SHEET | Secondary filter screen variant |
| 0636100803 | CAP SCREW | Alternate cap screw for mounting |
| 0501316470 | BREATHER | Pressure equalization vent |
| 0750301003 | OIL FEED.HOUSG. | Oil feed housing for lubrication circuit |
Frequently Asked Questions
Q: Can I install the 4656.056.017 without replacing the housing sections?
It is strongly recommended to inspect and replace the HOUS.FRONT SECT and HOUSING REAR PART simultaneously, as wear on one component often indicates wear on the mating surfaces.
Q: How do I confirm this part fits my WG 160 transmission?
Verify your transmission serial number and compare the internal valve body layout. The SKU 4656.056.017 is a direct OEM replacement for all WG 160 variants produced after 2005.
Q: What tools are needed for replacement?
Standard metric socket set, torque wrench, and a seal driver. The CYLINDRICAL PIN must be aligned precisely during installation to avoid damage.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
