Overview
The ZF 4656.056.144 is a precision-engineered OEM genuine component specifically designed for the WG 160 Series transmission. This part serves as a critical interface element within the hydraulic control system, ensuring precise fluid routing and pressure regulation during gear shifts. As an integral part of the valve body assembly, the 4656.056.144 works in concert with the TRANSMISSION HOUSING to maintain optimal oil flow and clutch engagement timing. The SKU 4656.056.144 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit and restoring factory performance in WG160 transmissions.
Symptoms of Failure
- Delayed or harsh gear engagement: When the 4656.056.144 wears, hydraulic pressure drops, causing noticeable hesitation when shifting from Neutral to Drive or Reverse.
- Intermittent gear slipping under load: A worn part leads to inconsistent clutch pack pressure, resulting in RPM flare without corresponding acceleration, especially during uphill driving.
- Transmission fluid contamination: Degradation of this component can generate fine metallic debris, which circulates through the system and accelerates wear on the HOUS.FRONT SECT and other precision surfaces.
- Erratic shift patterns: The transmission may skip gears or hold gears too long as the control unit compensates for inconsistent hydraulic signals from the failing part.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4656.056.144 |
| Material | Hardened alloy steel with anti-corrosion coating |
| Weight | 0.42 kg (0.93 lbs) |
| Overall Length | 78.5 mm |
| Outer Diameter | 32.0 mm |
| Surface Finish | Ground and polished, Ra ≤ 0.4 μm |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF 4656.056.144 (Genuine) |
Compatibility
This part is primarily engineered for the ZF WG 160 Series transmission family. Based on its design and hydraulic function, the 4656.056.144 is also compatible with the following ZF models: WG 180, WG 200, WG 150, and WG 220 series transmissions. It is commonly used in medium-duty trucks, buses, and off-highway equipment. For proper installation, this component must be aligned with the HOUSING REAR PART and the HOUSING REAR SECTION to ensure correct fluid channel sealing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101056 | TRANSMISSION HOUSING | Main structural casing for gear and shaft assembly |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft and pump |
| 4656201077 | HOUSING REAR PART | Rear housing section supporting output shaft |
| 4656298049 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 4656301148 | FIXING PLATE | Retention plate for valve body components |
| 0636100817 | CAP SCREW | M8 fastening bolt for housing assembly |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for oil sump |
| 0636100803 | CAP SCREW | M10 fastening bolt for rear housing |
Frequently Asked Questions
Q: Can the 4656.056.144 be replaced without removing the transmission from the vehicle?
A: In most applications, this component is accessible after draining the fluid and removing the transmission oil pan. However, on certain WG160 installations with limited clearance, partial removal of the HOUS.FRONT SECT may be required for proper access.
Q: How does a failing 4656.056.144 affect transmission temperature?
A: A worn part causes internal fluid leakage, which generates excess heat. Operators often notice transmission temperatures rising 15-20°C above normal operating range before other symptoms become apparent.
Q: Is this part interchangeable between WG160 and WG180 transmissions?
A: Yes, the 4656.056.144 is dimensionally identical across WG150 through WG220 series. Always verify the condition of the mating HOUSING REAR SECTION during replacement to ensure proper sealing.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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