Overview
The ZF 4656.055.309 is a precision-engineered OEM genuine component specifically designed for the WG 160 Series transmission. This critical part functions as a hydraulic control element, regulating oil flow and pressure within the valve body assembly to ensure smooth gear engagement and consistent torque delivery. The SKU 4656.055.309 sits at the heart of the transmission’s hydraulic circuit, directly interfacing with the CYLINDRICAL PIN for precise alignment and the O-RING for leak-proof sealing. As an OEM genuine part, it meets ZF’s exacting tolerances for material hardness and surface finish, making it the preferred choice for rebuilders and fleet maintenance teams seeking maximum service life.
Symptoms of Failure
- Erratic gear engagement or delayed shifting – When the 4656.055.309 wears, hydraulic pressure drops, causing harsh or delayed clutch application. This is often searched as “ZF WG160 shifting hesitation fix.”
- Transmission fluid leaks at the valve body interface – A worn sealing surface allows ATF to bypass, leading to low fluid levels and eventual slipping. Technicians frequently search “ZF 4656.055.309 oil leak repair.”
- Intermittent loss of drive in forward or reverse – Internal wear causes pressure loss to specific clutches, resulting in “ZF WG160 no forward gear” scenarios.
- Increased operating temperature and burnt fluid smell – Hydraulic inefficiency generates excess heat, accelerating fluid degradation and component wear.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4656.055.309 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 120 mm x 45 mm x 35 mm |
| OEM Reference | ZF 4656.055.309 |
| Sealing Type | Static O-ring seal (uses O-RING 0634313603) |
| Mounting Hardware | Requires 螺栓 0636115293 for secure installation |
Compatibility
This OEM genuine part is engineered for the ZF WG 160 Series, but it also fits select models in the WG180 and WG200 families due to shared hydraulic architecture. It is commonly used in ZF WG160, WG180, and WG200 transmissions found in medium-duty trucks, buses, and off-highway equipment. For proper installation, always pair with the HOUS.FRONT SECT 4656201085 to ensure correct alignment and oil gallery continuity.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656201085 | HOUS.FRONT SECT | Front housing section providing structural support and oil routing |
| 0636115293 | 螺栓 | Mounting bolt for secure fastening of valve body components |
| 0634313603 | O-RING | Static seal preventing fluid leaks at mating surfaces |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise positioning of hydraulic components |
| 4656301148 | FIXING PLATE | Retaining plate for securing valve body assemblies |
| 0636100817 | CAP SCREW | Hex cap screw for high-torque fastening applications |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic fluid contamination control |
| 4656301017 | SCREEN SHEET | Secondary mesh filter for enhanced debris protection |
| 0636100803 | CAP SCREW | Low-profile cap screw for confined-space installations |
| 4656301047 | OIL FEED.HOUSG. | Oil feed housing directing pressurized fluid to clutch packs |
Frequently Asked Questions
Q: Can the ZF 4656.055.309 be used in a WG180 transmission?
A: Yes, this part is compatible with WG180 and WG200 models that share the same valve body architecture. Always verify the housing bore dimensions and O-ring groove depth before installation.
Q: What is the typical lifespan of this OEM genuine part?
A: Under normal operating conditions with proper fluid maintenance, the 4656.055.309 typically lasts 300,000 to 500,000 miles. Premature failure is often caused by contaminated fluid or worn alignment pins like the CYLINDRICAL PIN.
Q: Do I need to replace the O-ring and bolts when installing this part?
A: Yes, ZF recommends always replacing the O-RING and 螺栓 during service to prevent leaks and ensure proper clamping force.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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