Overview
The ZF 4656.056.182 is a precision-engineered OEM genuine part specifically designed for the WG 160 series transmission. This component plays a critical role in the hydraulic control circuit, ensuring consistent oil pressure regulation and smooth gear engagement within the transmission assembly. As an integral element of the valve body system, the 4656.056.182 works in concert with the TRANSMISSION HOUSING to maintain structural integrity and fluid flow. This SKU is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty industrial applications.
Symptoms of Failure
- Erratic gear engagement or delayed shifting — When the 4656.056.182 wears, hydraulic pressure fluctuations cause hesitation between gear changes, particularly under load.
- Transmission fluid seepage around the valve body — A degraded seal or cracked bore in this part leads to visible oil leaks near the HOUS.FRONT SECT interface.
- Intermittent slipping in higher gears — Internal wear reduces clamping force on clutch packs, causing the transmission to momentarily lose torque transfer during acceleration.
- Increased operating noise or whining — Cavitation from improper oil metering produces a high-pitched sound, often accompanied by rough idling.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4656.056.182 |
| Material | High-grade aluminum alloy with hardened steel inserts |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 145 mm x 72 mm x 38 mm |
| OEM Reference | ZF 4656.056.182 (Genuine) |
| Seal Type | Nitrile rubber O-ring (integrated) |
Compatibility
This genuine ZF part is primarily engineered for the WG 160 Series transmission. It is also compatible with the following ZF models that share the same hydraulic valve body architecture: WG 180, WG 200, and select variants of the WG 150 series. Always verify the part number against your transmission’s serial plate. The 4656.056.182 interfaces directly with the HOUSING REAR PART and the HOUSING REAR SECTION to form a sealed pressure chamber.
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 pump and converter |
| 4656201077 | HOUSING REAR PART | Rear housing segment for output shaft support |
| 4656298049 | HOUSING REAR SECTION | End cap section for oil sump sealing |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 4656301148 | FIXING PLATE | Retaining plate for valve body components |
| 0636100817 | CAP SCREW | Fastener for securing housing sections |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for debris protection |
| 0636100803 | CAP SCREW | Bolt for valve body attachment |
Frequently Asked Questions
Q: How do I know if the 4656.056.182 is failing on my WG160?
A: Look for erratic shifting patterns, especially when the transmission is hot. A common sign is a delay when moving from neutral to drive, accompanied by a momentary loss of hydraulic pressure.
Q: Can I replace this part without removing the entire transmission?
A: Yes, the 4656.056.182 is accessible after draining the fluid and removing the transmission oil pan and valve body cover. However, we recommend replacing the SCREEN SHEET and all gaskets simultaneously to prevent future contamination.
Q: Is this part interchangeable between WG160 and WG180 models?
A: In most cases, yes. The 4656.056.182 shares the same mounting footprint and hydraulic passages across the WG160, WG180, and WG200 series. Always cross-reference your transmission’s serial number with the OEM parts catalog for absolute confirmation.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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