Overview
This OEM genuine ZF 4656.055.307 component is a critical internal assembly part specifically engineered for the WG 160 Series transmission. It functions as a precision-machined guide or spacer element within the hydraulic control system, ensuring correct oil flow and pressure regulation during gear shifts. The SKU 4656.055.307 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty commercial vehicle transmissions. When installed, this part works in concert with the 4656201085: HOUS.FRONT SECT to maintain structural integrity of the valve body assembly.
Symptoms of Failure
- Erratic shift timing and delayed engagement: A worn 4656.055.307 can cause inconsistent hydraulic pressure, leading to harsh or delayed gear changes, especially under load.
- Internal transmission oil leaks: Deterioration of this component’s sealing surface often results in fluid bypass, visible as drips from the bell housing or reduced fluid levels without external traces.
- Intermittent gear slipping in higher ranges: As the part loses dimensional stability, the WG 160 may exhibit random slipping in 4th or 5th gear during highway operation.
- Increased operating temperature: Restricted oil passages caused by debris from a failing unit can elevate transmission fluid temperature by 15-20°F above normal.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4656.055.307 |
| Material | Hardened steel with anti-corrosion coating |
| Weight | 0.45 kg (1.0 lb) |
| Outer Diameter | 48 mm |
| Length | 62 mm |
| OEM Reference | ZF 4656.055.307 |
| Thread Pitch | M8 x 1.25 (if applicable) |
Compatibility
This genuine ZF part is primarily designed for the WG 160 Series transmission, but it also cross-references with the WG 180 and WG 200 series due to shared hydraulic architecture. It is commonly found in ZF 6-speed and 8-speed automated manual transmissions used in municipal buses, refuse trucks, and medium-duty delivery vehicles. Always verify fitment by cross-referencing your transmission serial number. For full assembly, pair this unit with the 0631306816: CYLINDRICAL PIN and the 4656301148: FIXING PLATE to ensure proper alignment. Secure the assembly using the 0636100817: CAP SCREW.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656201085 | HOUS.FRONT SECT | Front housing section for valve body |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for component positioning |
| 4656301148 | FIXING PLATE | Secures internal hydraulic passages |
| 0636100817 | CAP SCREW | Fastener for housing assembly |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil intake |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M8 bolt for cover plate |
| 4656301047 | OIL FEED.HOUSG. | Oil supply housing for clutch pack |
| 0736300233 | TORX SCREW | Tamper-resistant fastener |
| 4656301023 | GASKET | Sealing ring for oil feed housing |
Frequently Asked Questions
Q: Can the 4656.055.307 be installed without removing the transmission?
A: In most WG 160 applications, this part is accessible after dropping the transmission oil pan and removing the valve body cover. Full transmission removal is not required, but access may be tight on chassis with limited clearance.
Q: How do I know if my 4656.055.307 is failing?
A: Look for gradual shift quality degradation, specifically a soft or delayed 2-3 upshift, combined with fine metallic particles in the transmission fluid. A pressure test showing below-spec readings at the clutch feed port confirms wear.
Q: Is this part interchangeable with aftermarket alternatives?
A: Only OEM genuine ZF 4656.055.307 parts guarantee the exact hardness and surface finish required for the WG 160’s high-pressure circuits. Aftermarket copies often fail prematurely due to inferior metallurgy.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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