Overview
The ZF 4656.056.174 is a precision-engineered OEM genuine component designed specifically for the WG 160 Series transmission. This part functions as a critical hydraulic control element, regulating oil flow and pressure within the valve body assembly to ensure smooth gear engagement and consistent clutch application. The SKU 4656.056.174 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty commercial vehicle transmissions. When installed alongside the 4656101057: TRANSMISSION HOUSING, this component ensures optimal sealing and alignment within the main gear train.
Symptoms of Failure
- Delayed or harsh shifting: A worn 4656.056.174 can cause erratic shift timing, particularly when the transmission is under load or at operating temperature.
- Internal hydraulic pressure loss: Degraded sealing surfaces lead to low line pressure, resulting in clutch slip and reduced torque capacity during acceleration.
- Transmission fluid contamination: Cracks or material fatigue in this part allow metal particles to circulate, accelerating wear on the 4656201075: HOUS.FRONT SECT and adjacent valve body components.
- Intermittent neutral engagement: A failing unit may cause the transmission to unexpectedly drop out of gear, especially during deceleration or low-speed maneuvering.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4656.056.174 |
| Material | High-grade aluminum alloy with hardened steel inserts |
| Weight | 1.85 kg (4.08 lbs) |
| Dimensions (L x W x H) | 210 mm x 95 mm x 65 mm |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF WG 160 Series |
| Seal Type | Nitrile rubber (NBR) O-ring compatible |
Compatibility
This part is primarily engineered for the ZF WG 160 transmission series, but it also shares mounting patterns with the WG 180 and WG 200 models used in mid-range trucks and buses. It is not compatible with the WG 120 or WG 300 series without modification. For proper installation, ensure the 4656201078: HOUSING REAR PART and 4656298050: HOUSING REAR SECTION are free of scoring or distortion before assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101057 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft bearing |
| 4656201078 | HOUSING REAR PART | Rear housing section for output shaft support |
| 4656298050 | 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 assembly |
| 0636100817 | CAP SCREW | M10 x 30mm bolt for housing fastening |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for oil sump |
| 0636100803 | CAP SCREW | M8 x 25mm bolt for cover plate |
Frequently Asked Questions
Q: How do I know if the 4656.056.174 is the correct replacement for my WG160 transmission?
Check the stamped part number on the valve body plate. If it matches 4656.056.174 and your transmission serial number begins with “WG160,” this is the direct OEM fit. Always verify with the 4656101057: TRANSMISSION HOUSING for casting compatibility.
Q: Can I reuse the old O-rings when installing this part?
No. ZF recommends replacing all seals and gaskets simultaneously. The 0636100817: CAP SCREW should also be replaced to maintain proper torque retention.
Q: What causes premature failure of this component?
Common causes include contaminated transmission fluid, over-torquing of the 4656301148: FIXING PLATE, or misalignment of the 4656201075: HOUS.FRONT SECT during previous repairs.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
