Overview
The ZF 4656.006.021 is a precision-engineered OEM genuine component specifically designed for the WG 115 Series transmission. This part functions as a critical internal control element, regulating hydraulic pressure and fluid flow within the valve body assembly to ensure precise clutch engagement and smooth gear shifts. The SKU 4656.006.021 is manufactured to ZF’s exacting tolerances, making it an essential replacement for maintaining factory-specified shift quality and transmission longevity. When installed alongside the TRANSMISSION HOUSING (4656101037), it ensures proper alignment and sealing within the main casing.
Symptoms of Failure
- Delayed or harsh gear engagement: When the 4656.006.021 wears, internal leakage causes a lag when shifting from Neutral to Drive or Reverse, often accompanied by a jarring thud.
- Erratic shift timing: A worn part leads to inconsistent shift points, where the transmission may upshift too early or hold gears too long under light throttle.
- Fluid contamination from internal debris: Degradation of this component can shed fine metallic particles into the hydraulic circuit, accelerating wear on the HOUS.FRONT SECT (4656201075) and other precision bores.
- Intermittent loss of forward or reverse: Advanced wear may cause a complete pressure drop to specific clutches, resulting in a “no-move” condition that requires immediate replacement.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4656.006.021 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 0.45 kg (1.0 lb) |
| Dimensions (L x W x H) | 85 mm x 45 mm x 30 mm |
| Surface Finish | Ground and polished to Ra 0.4 µm |
| Operating Pressure Range | 10–22 bar (145–319 psi) |
| OEM Reference | ZF WG 115 Series |
Compatibility
This genuine ZF part is primarily engineered for the WG 115 series transmissions. It is also compatible with the WG 180 and WG 200 series models that share the same valve body architecture. For proper fitment, the 4656.006.021 must be installed in conjunction with the HOUSING REAR PART (4656201035) and the HOUSING REAR PART (4472239178) to maintain correct fluid routing and structural integrity. Always verify your transmission model number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101037 | TRANSMISSION HOUSING | Main casing that encloses all rotating and hydraulic components |
| 4656201075 | HOUS.FRONT SECT | Front section housing the torque converter and pump assembly |
| 4656201035 | HOUSING REAR PART | Rear housing section supporting output shaft and planetary gears |
| 4472239178 | HOUSING REAR PART | Alternate rear housing variant for specific WG series configurations |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing-to-housing positioning |
| 4656301148 | FIXING PLATE | Retains valve body components and prevents axial movement |
| 0636100817 | CAP SCREW | High-tensile fastener securing the housing sections together |
| 4656301016 | SCREEN SHEET | Fine mesh filter protecting hydraulic circuits from debris |
| 4656301017 | SCREEN SHEET | Alternate mesh filter for high-flow hydraulic applications |
| 0636100803 | CAP SCREW | Standard-duty fastener for auxiliary bracket mounting |
Frequently Asked Questions
Q: Can the 4656.006.021 be replaced without removing the transmission from the vehicle?
A: In most applications, this part is accessible after dropping the transmission oil pan and removing the valve body cover. However, on certain chassis configurations, clearance may require partial transmission removal. Always consult the ZF service manual for your specific WG 115 model.
Q: How do I confirm that the 4656.006.021 is the correct part for my WG 115 transmission?
A: Verify the OEM part number stamped on your existing component. Cross-reference your transmission serial number with ZF’s compatibility charts. The part is also identifiable by its distinctive ground finish and three locating notches on the mounting flange.
Q: What is the typical service life of this part before replacement is needed?
A: Under normal operating conditions with regular fluid and filter changes, the 4656.006.021 typically lasts 300,000 to 500,000 kilometers. Heavy-duty applications (e.g., construction or mining) may require inspection every 100,000 kilometers due to higher thermal and pressure loads.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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