Overview
The ZF 4656.056.168 is a precision-engineered component designed specifically for the WG 160 Series transmission. This OEM genuine part plays a critical role in the hydraulic control system, ensuring precise modulation of clutch pressure and smooth gear engagement under heavy load conditions. As a core element within the valve body assembly, the 4656.056.168 regulates fluid flow to maintain consistent shift quality. The SKU 4656.056.168 is manufactured to ZF’s original tolerances, guaranteeing a direct fit and long service life in commercial vehicle drivelines.
Symptoms of Failure
When the ZF 4656.056.168 begins to wear, operators often notice delayed or harsh gear engagement during acceleration, particularly when shifting from neutral to drive. Another common failure symptom is intermittent transmission slipping under load, which may be accompanied by fluctuating RPM without corresponding vehicle speed increase. Technicians frequently report erratic shift patterns or the transmission failing to hold a gear on inclines. In advanced cases, internal hydraulic pressure loss can lead to overheating, as the part no longer maintains proper fluid routing within the WG 160 series.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4656.056.168 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Length | 142 mm |
| Width | 48 mm |
| Height | 32 mm |
| OEM Reference | ZF 4656.056.168 (Genuine) |
| Operating Pressure | 12–18 bar |
| Temperature Range | -40°C to +120°C |
Compatibility
This OEM genuine part is primarily designed for the ZF WG 160 Series transmission family. It is also compatible with the WG 180 and WG 200 series transmissions that share the same hydraulic valve architecture. Additionally, the 4656.056.168 can be used in select WG 150 variants where the valve body configuration matches. Always verify your transmission serial number against ZF’s application guide before installation. This part integrates directly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to form the main structural assembly. For rearward sealing, it works in conjunction with the HOUSING REAR PART and the HOUSING REAR SECTION.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101057 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft and bearings |
| 4656201078 | HOUSING REAR PART | Rear housing section for output shaft support |
| 4656298050 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 4656301148 | FIXING PLATE | Retaining plate for valve body positioning |
| 0636100817 | CAP SCREW | M10 fastener for housing attachment |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for oil sump |
| 0636100803 | CAP SCREW | M8 fastener for valve body cover |
Frequently Asked Questions
Q: How do I know if the 4656.056.168 is the correct replacement for my WG 160 transmission?
A: Verify your transmission’s model plate. The WG 160 series uses this part in valve bodies with a specific bore diameter. If your transmission exhibits erratic shifting and the original part number matches 4656.056.168, this is the direct OEM replacement.
Q: Can I install this part without removing the entire transmission?
A: Yes, in most cases. The 4656.056.168 is accessible after removing the transmission oil pan and valve body cover. However, you must drain the fluid and clean the mating surfaces of the TRANSMISSION HOUSING before installation to prevent contamination.
Q: What torque specification should I use for the retaining bolts?
A: ZF recommends 25 Nm for the cap screws securing this component. Always use new CAP SCREW fasteners and apply thread locker to prevent loosening under vibration.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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