Overview
This OEM genuine ZF 4656.056.046 component is a critical internal actuation and sealing element specifically engineered for the WG 160 Series transmission. Positioned within the valve body and hydraulic control assembly, this part manages fluid routing to ensure precise clutch pack engagement and disengagement. The SKU 4656.056.046 is manufactured to ZF’s exacting tolerances, guaranteeing consistent oil pressure regulation across all operating temperatures. When installed alongside the 4656101037: TRANSMISSION HOUSING, it forms a sealed hydraulic circuit that prevents cross-contamination between lubrication and control circuits.
Symptoms of Failure
- Delayed or harsh gear engagement — Worn internal bores cause pressure loss, resulting in a noticeable lag when shifting from Neutral to Drive or Reverse.
- Intermittent transmission slipping — As the part loses its sealing integrity, you may experience random slipping under load, particularly in higher gears.
- Hydraulic fluid seepage around the valve body — External oil leaks often appear near the mating surface with the 4656201075: HOUS.FRONT SECT, indicating degraded sealing surfaces.
- Erratic shift patterns — Fluctuating line pressure caused by this failing component leads to unpredictable shift timing and harsh downshifts.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4656.056.046 |
| Material | Hardened alloy steel with nitrile sealing elements |
| Weight | 0.42 kg (0.93 lbs) |
| Operating Pressure Range | 8–22 bar (116–319 psi) |
| Temperature Range | -40°C to +120°C (-40°F to +248°F) |
| Surface Finish | Ra 0.4 µm on sealing faces |
| OEM Reference | ZF 4656.056.046 |
Compatibility
This part is primarily designed for the ZF WG 160 Series, but it also cross-fits select models in the WG 180 and WG 200 families due to shared hydraulic architecture. It is a direct replacement for units equipped with the 4656201035: HOUSING REAR PART and the 4472239178: HOUSING REAR PART. Always verify your transmission serial number before ordering, as minor revisions exist between early and late production runs.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101037 | TRANSMISSION HOUSING | Main structural casing that supports all internal components |
| 4656201075 | HOUS.FRONT SECT | Front section housing the torque converter and pump assembly |
| 4656201035 | HOUSING REAR PART | Rear casing that encloses the output shaft and planetary gears |
| 4472239178 | HOUSING REAR PART | Alternate rear housing variant for specific WG series revisions |
| 0631306816 | CYLINDRICAL PIN | Precision alignment pin for doweling housing sections |
| 4656301148 | FIXING PLATE | Retention plate securing valve body components |
| 0636100817 | CAP SCREW | M8 high-tensile fastener for housing attachment |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic fluid intake |
| 4656301017 | SCREEN SHEET | Secondary filter screen for return line debris |
| 0636100803 | CAP SCREW | M6 fastener for securing filter screens |
Frequently Asked Questions
Q: Can I install the 4656.056.046 without replacing the sealing rings?
A: No. ZF recommends always replacing all elastomeric seals and O-rings when installing this part, as aged seals will compromise the new component’s performance and lead to premature failure.
Q: How do I confirm this part fits my WG160 transmission?
A: Check the transmission data plate for the exact model code (e.g., WG160-6.7). This part is compatible with all WG160 variants built after 2008, but earlier units may require the 4656301148: FIXING PLATE adapter kit.
Q: What torque specification is required for the cap screws securing this component?
A: Use 28 Nm (20.6 ft-lbs) for the M8 cap screws (0636100817) and 12 Nm (8.9 ft-lbs) for the M6 screws (0636100803). Always apply thread locker to prevent loosening from vibration.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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