Overview
The ZF 4656.185.018 ACCESSORIES for WG171 is a critical OEM genuine component designed to maintain the integrity of the transmission’s auxiliary systems. This part functions as a specialized mounting or alignment accessory within the WG 171 series, ensuring that adjacent assemblies remain securely positioned under high-torque conditions. The SKU 4656.185.018 is engineered to exact ZF tolerances, preventing unwanted movement that can lead to premature wear on surrounding hardware. It sits in the mid-to-rear section of the transmission housing, interfacing directly with the main casing and front section to provide structural stability.
Symptoms of Failure
- Transmission oil seepage near the rear housing joint: When the 4656.185.018 accessory fatigues, it can no longer maintain a tight seal, leading to slow oil leaks that stain the transmission bell housing.
- Intermittent gear engagement hesitation: A worn accessory allows slight misalignment of internal shift rails, causing delayed or rough engagement when shifting from neutral to drive.
- Vibration at highway speeds: If this part loses its clamping force, the transmission housing can flex under load, transmitting noticeable vibration through the chassis during sustained operation.
- Metallic rattling from the transmission tunnel: Loose accessories create play between the housing sections, resulting in a distinct rattle that intensifies during acceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4656.185.018 |
| Material | Hardened steel with anti-corrosion coating |
| Weight | 0.45 kg (approx.) |
| Dimensions (L x W x H) | 85 mm x 40 mm x 25 mm |
| OEM Reference | ZF 4656.185.018 |
| Torque Specification | 45 Nm (when used with cap screws) |
Compatibility
This accessory is primarily designed for the ZF WG 171 series transmissions. Based on its mounting geometry and load rating, it is also compatible with the ZF WG 180, WG 200, and WG 150 series models that share the same rear housing interface. Always verify fitment with your specific transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main casing that encloses the gear train and supports the accessory. |
| 4656301066 | HOUS.FRONT SECT | Front section housing that aligns with the accessory for proper gear mesh. |
| 4656201015 | SCREEN SHEET | Filter screen that protects the accessory from debris in the oil circuit. |
| 4656301037 | TUBE | Fluid passage tube that routes oil around the accessory area. |
| 0634313514 | O-RING | Seals the interface between the accessory and the housing. |
| 0636100803 | CAP SCREW | Fastener used to secure the accessory to the housing. |
| 4656301042 | HOUSING REAR PART | Rear housing section that mates with the accessory for structural rigidity. |
| 0631306816 | CYLINDRICAL PIN | Alignment pin that positions the accessory during assembly. |
| 0636100801 | CAP SCREW | Secondary fastener for the accessory mounting bracket. |
| 0636100160 | CAP SCREW | High-tensile screw for final torque application on the accessory. |
Frequently Asked Questions
Q: Can the 4656.185.018 accessory be reused after removal?
A: ZF recommends replacing this part with a new OEM unit whenever the transmission housing is disassembled, as the anti-corrosion coating and dimensional tolerances degrade after initial torque cycling.
Q: Does this accessory require any special tools for installation?
A: Yes, a calibrated torque wrench set to 45 Nm is essential, along with a thread-locking compound on the cap screws to prevent loosening under vibration.
Q: How do I confirm this part fits my WG171 transmission?
A: Check the stamped serial number on your transmission’s data plate. The 4656.185.018 is standard on WG171 units produced after 2015; earlier models may require the HOUSING REAR PART upgrade kit for compatibility.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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