Overview
This OEM genuine ZF 4656.056.165 component is a critical internal control element engineered specifically for the WG 160 Series transmission. Positioned within the hydraulic control unit of the gearbox, this part regulates fluid pressure and flow to ensure precise clutch and brake engagement during shifting. The SKU 4656.056.165 is manufactured to ZF’s original tolerances, guaranteeing direct interchangeability and long service life. When installed alongside the 4656101056: TRANSMISSION HOUSING, it forms a sealed assembly that prevents cross-contamination between lubrication and actuation circuits.
Symptoms of Failure
When the 4656.056.165 begins to degrade, operators typically notice erratic gear engagement during low-speed maneuvers, a condition often searched as “ZF transmission hesitation when shifting.” Another common failure mode is intermittent loss of forward or reverse drive under moderate load, frequently described by technicians as “WG160 slipping under acceleration.” You may also observe hydraulic fluid contamination with metallic particles, which accelerates wear on the 4656201075: HOUS.FRONT SECT and adjacent valve bodies. Finally, audible buzzing or whining from the transmission sump indicates cavitation caused by a failing pressure regulator within this part.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.056.165 |
| Material | Hardened alloy steel with anti-corrosion coating |
| Weight | 0.85 kg (1.87 lbs) |
| Length | 142 mm |
| Width | 38 mm |
| Height | 28 mm |
| OEM Reference | ZF 4656.056.165 (Genuine) |
| Operating Pressure Range | 8–22 bar |
| Seal Type | Nitrile rubber O-ring (integrated) |
Compatibility
This part is primarily designed for the ZF WG 160 Series transmission family, which includes the WG160, WG161, and WG162 variants. It also cross-fits select WG180 and WG200 models that share the same hydraulic control architecture, though verification of the 4656201077: HOUSING REAR PART casting number is recommended. The 4656.056.165 is not compatible with older WG120 or WG150 series due to different port configurations. For applications requiring the 4656298049: HOUSING REAR SECTION, ensure the mounting flange matches the 4-bolt pattern of this control element.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101056 | TRANSMISSION HOUSING | Main structural casing for gear train and valve body |
| 4656201075 | HOUS.FRONT SECT | Front section housing pump and torque converter |
| 4656201077 | HOUSING REAR PART | Rear housing supporting output shaft and PTO |
| 4656298049 | HOUSING REAR SECTION | Intermediate rear section for extended wheelbase models |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 4656301148 | FIXING PLATE | Retains control valve assembly in position |
| 0636100817 | CAP SCREW | M8 x 25 mm bolt for housing fastening |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic return line |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for suction line |
| 0636100803 | CAP SCREW | M6 x 20 mm bolt for valve body attachment |
Frequently Asked Questions
Q: Can the 4656.056.165 be replaced without removing the transmission from the vehicle?
A: Yes, in most WG160 installations this part is accessible after draining the fluid and removing the transmission oil pan. However, you must first detach the 4656201075: HOUS.FRONT SECT to reach the control valve bank.
Q: What is the typical service interval for this control element?
A: ZF recommends inspecting the 4656.056.165 during every major overhaul at 500,000 km or 8,000 operating hours. Premature failure is often linked to debris from a worn 4656301016: SCREEN SHEET.
Q: Does this part require special tools for installation?
A: A torque wrench calibrated to 25 Nm and a seal driver tool are necessary. Always replace the O-ring and the 0636100817: CAP SCREW to prevent fluid leaks.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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