Overview
This OEM genuine ZF 4656.055.111 component is a critical internal control element engineered specifically for the WG 160 Series transmission. It functions as a precision-machined valve body or actuator plate, regulating hydraulic fluid flow to manage clutch pack engagement and gear selection within the transmission assembly. The SKU 4656.055.111 is manufactured to ZF’s exacting tolerances, ensuring consistent oil pressure distribution and smooth shifting under heavy-duty industrial loads. When paired with the TRANSMISSION HOUSING (4656101056), it forms the central hydraulic control core of the gearbox.
Symptoms of Failure
- Erratic or delayed gear engagement: Worn internal bores or spool valves cause inconsistent hydraulic pressure, leading to harsh or slow shifts when accelerating.
- Transmission fluid leaks at the housing interface: Degraded sealing surfaces on the 4656.055.111 allow ATF to seep past the HOUS.FRONT SECT (4656201075), leaving visible puddles under the vehicle.
- Gear slipping under load: Internal cross-port leakage reduces clutch holding capacity, causing the transmission to momentarily lose drive power on inclines or during towing.
- High operating temperature warnings: Restricted fluid passages force the torque converter to work harder, generating excess heat that triggers dashboard alerts.
Technical Specifications
| Part Number | 4656.055.111 |
| Material | High-grade aluminum alloy with hardened steel inserts |
| Weight | 1.85 kg (4.08 lbs) |
| Overall Dimensions | 210 mm x 145 mm x 55 mm |
| OEM Reference | ZF 4656.055.111 (Genuine) |
| Operating Pressure Range | 8–18 bar (116–261 psi) |
| Seal Type | PTFE-coated O-ring grooves |
Compatibility
This genuine ZF 4656.055.111 is primarily designed for the WG 160 Series transmission family. It is also compatible with the WG 180 and WG 200 models that share the same hydraulic control architecture. The part interfaces directly with the HOUSING REAR PART (4656201077) and the HOUSING REAR SECTION (4656298049) to complete the valve body assembly. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101056 | TRANSMISSION HOUSING | Main structural casing that encloses all rotating and hydraulic components |
| 4656201075 | HOUS.FRONT SECT | Front section housing that supports the input shaft and pump assembly |
| 4656201077 | HOUSING REAR PART | Rear housing segment that contains the output shaft bearing and seal |
| 4656298049 | HOUSING REAR SECTION | Intermediate rear section that aligns the planetary gear set |
| 0631306816 | CYLINDRICAL PIN | Precision dowel pin for aligning housing halves during assembly |
| 4656301148 | FIXING PLATE | Retaining plate that secures the valve body to the housing |
| 0636100817 | CAP SCREW | M10 hex-head bolt for fastening the fixing plate |
| 4656301016 | SCREEN SHEET | Fine mesh filter that protects hydraulic circuits from debris |
| 4656301017 | SCREEN SHEET | Secondary filter screen for the low-pressure return circuit |
| 0636100803 | CAP SCREW | M8 cap screw for securing the screen sheet assembly |
Frequently Asked Questions
Q: Can I install the 4656.055.111 without replacing the housing seals?
No. ZF recommends always replacing the O-rings and gaskets on the TRANSMISSION HOUSING when installing this valve body part to prevent future leaks.
Q: How do I confirm this part fits my WG 160 transmission?
Locate the transmission serial number plate on the side of the main case. Cross-reference the model code (e.g., WG160-5A) with the OEM parts list. The 4656.055.111 is used in all WG160 variants from serial number 2,500,001 onward.
Q: What torque specification should I use for the fixing plate bolts?
Use 25 Nm (18.4 lb-ft) for the CAP SCREW (0636100817) and 18 Nm (13.3 lb-ft) for the CAP SCREW (0636100803). Always apply thread locker to prevent loosening from vibration.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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