Overview
This OEM genuine ZF 4656.185.061 accessory component is a critical interface element within the WG 171 transmission series. Designed to secure and align internal hydraulic circuits, this part ensures proper fluid routing between the main casing and auxiliary valve bodies. The SKU 4656.185.061 is precision-engineered to maintain consistent oil pressure and prevent cross-threading during assembly. It works in concert with the 4656101030: TRANSMISSION HOUSING and the 4656301066: HOUS.FRONT SECT to create a sealed environment for gear train operation.
Symptoms of Failure
- Intermittent gear slippage under load — When the 4656.185.061 loses its sealing integrity, hydraulic pressure drops, causing delayed engagement in forward gears. This is often misdiagnosed as a clutch pack issue.
- External oil seepage at the bell housing joint — A worn accessory component allows transmission fluid to weep past the mating surface, leaving visible drips on the underside of the WG171 assembly.
- Erratic shift timing during cold starts — Degraded material in this part causes inconsistent fluid flow to the valve body, resulting in harsh or delayed shifts until the transmission reaches operating temperature.
- Metallic debris in the oil pan — As the accessory wears, microscopic particles break free and circulate through the system, often caught by the 4656201015: SCREEN SHEET filter element.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.185.061 |
| Material | Hardened steel with zinc-nickel plating |
| Weight | 0.34 kg (0.75 lbs) |
| Overall Length | 82 mm |
| Thread Pitch | M10 x 1.5 |
| Hex Size | 17 mm |
| Torque Specification | 45 Nm (33 ft-lbs) |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF 4656.185.061 |
Compatibility
This genuine ZF accessory is primarily designed for the WG 171 Series transmissions found in medium-duty commercial vehicles. It is also compatible with the WG180 and WG200 series when used in conjunction with the 4656301037: TUBE adapter. The part fits select WG150 and WG250 variants produced after 2012. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101030 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4656301066 | HOUS.FRONT SECT | Front section housing for pump and converter |
| 4656201015 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4656301037 | TUBE | Fluid transfer conduit between sections |
| 0634313514 | O-RING | Sealing ring for hydraulic connections |
| 0636100803 | CAP SCREW | Fastener for housing attachment |
| 4656301064 | HOUSING REAR PART | Rear casing section for output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precision assembly |
| 0636100801 | CAP SCREW | Bolt for securing valve body |
| 0636100160 | CAP SCREW | Fastener for oil pan attachment |
Frequently Asked Questions
Q: Can I reuse the 4656.185.061 accessory after a transmission rebuild?
A: ZF recommends replacing this part with a new OEM unit during any major overhaul. The sealing surfaces deform slightly during initial torque application, making reuse risky for pressure retention.
Q: Does this part require special tools for installation?
A: A standard 17mm socket and torque wrench are sufficient. However, ensure the mating face on the TRANSMISSION HOUSING is clean and free of old gasket material before installation.
Q: Will this fit a ZF WG180 transmission from 2008?
A: Yes, the 4656.185.061 is backward compatible with WG180 units, but you must also replace the O-RING (0634313514) to ensure a proper seal on older housings.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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