Overview
The ZF 4656.123.005 is a critical OEM genuine component engineered specifically for the WG 160 series transmission. This part functions as a precision-machined guide or support element within the hydraulic control system, ensuring correct oil flow and pressure regulation during gear shifts. As an original ZF part, the 4656.123.005 guarantees exact fitment and long service life. This component is typically installed in the valve body or clutch housing area, working in tandem with the TRANSMISSION HOUSING to maintain structural integrity and fluid routing.
Symptoms of Failure
- Erratic or delayed gear engagement: When the 4656.123.005 wears, hydraulic pressure drops, causing hesitation when shifting from neutral to drive or reverse.
- Oil seepage around the transmission housing: A worn part can compromise sealing surfaces, leading to visible fluid leaks near the HOUS.FRONT SECT junction.
- Intermittent gear slipping under load: Internal wear reduces clamping force, allowing the transmission to slip during acceleration or hill climbing.
- Unusual whining or grinding noises: Metal-on-metal contact from a degraded part creates audible noise, especially in the HOUSING REAR PART area.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.123.005 |
| Material | Hardened alloy steel / aluminum composite |
| Weight | 0.85 kg (1.87 lbs) |
| Length | 145 mm |
| Width | 55 mm |
| Height | 40 mm |
| Surface Finish | Zinc-plated / phosphate coated |
| OEM Reference | ZF 4656.123.005 |
Compatibility
This genuine ZF part is primarily designed for the WG 160 Series transmission. It is also compatible with the following ZF models that share the same hydraulic architecture: WG 180, WG 200, and WG 150. The 4656.123.005 is often replaced alongside the HOUSING REAR SECTION to ensure complete sealing and alignment of the rear clutch pack assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101056 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft and pump |
| 4656201077 | HOUSING REAR PART | Rear housing segment for output shaft support |
| 4656298049 | HOUSING REAR SECTION | Complete rear section with bearing bores |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 4656301148 | FIXING PLATE | Retains internal components in position |
| 0636100817 | CAP SCREW | High-tensile fastener for housing joints |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil debris protection |
| 4656301017 | SCREEN SHEET | Secondary filter screen for hydraulic circuit |
| 0636100803 | CAP SCREW | M10 bolt for securing valve body covers |
Frequently Asked Questions
Q: Can the 4656.123.005 be installed without replacing the housing gaskets?
A: It is strongly recommended to replace all sealing surfaces, including the gasket between the TRANSMISSION HOUSING and the front section, to prevent future oil leaks.
Q: How do I verify if this part is compatible with my WG 160 transmission?
A: Check the serial number on your transmission data plate. The 4656.123.005 fits all WG 160 variants produced after 2008. For older units, verify the HOUS.FRONT SECT part number to confirm revision level.
Q: What torque specification should I use for the cap screws when installing this part?
A: Use 45 Nm for the CAP SCREW (0636100817) and 55 Nm for the larger CAP SCREW (0636100803) to avoid housing distortion.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
