Overview
This ZF 4644.309.005 FLANGE for the WG190 series is a critical driveline component that transmits rotational force from the transmission output shaft to the propeller shaft. Positioned at the rear of the gearbox housing, this OEM genuine flange ensures a precise, vibration-free connection that maintains torque integrity under heavy loads. The SKU 4644.309.005 is engineered to exact ZF tolerances, guaranteeing a perfect seal and alignment within the WG190 assembly. When paired with a robust TRANSMISSION HOUSING, this flange forms the backbone of the power transfer system, reducing stress on adjacent components like the HOUS.FRONT SECT and the HOUSING REAR PART.
Symptoms of Failure
- Transmission fluid seepage at the output shaft: A worn flange face or damaged seal surface causes oil to weep past the CYLINDRICAL PIN, leading to low fluid levels and potential gearbox overheating.
- Driveline vibration during acceleration: When the flange splines wear unevenly, rotational imbalance occurs, creating a shudder that intensifies under load—a classic sign of a failing 4644.309.005 unit.
- Clunking noise when shifting between drive and reverse: Excessive backlash from a loose or cracked flange results in audible metallic impacts, often misdiagnosed as a failing universal joint.
- Visible rust or pitting on the flange mating surface: Corrosion compromises the seal integrity, allowing contaminants to enter the transmission and accelerate wear on internal components.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.309.005 |
| Material | High-strength alloy steel (induction hardened) |
| Weight | 2.4 kg (5.3 lbs) |
| Flange Diameter | 130 mm |
| Bolt Hole Pattern | 6 x M12 on 100 mm PCD |
| Spline Count | 24 splines (internal) |
| OEM Reference | ZF 4644.309.005 |
| Torque Capacity | 1,200 Nm (885 lb-ft) |
Compatibility
This flange is specifically designed for the ZF WG190 series transmission, but it also fits select models in the WG180 and WG200 families due to shared spline geometry and bolt patterns. It is commonly used in WG190, WG180, and WG200 gearboxes found in medium-duty trucks, buses, and off-highway equipment. Always verify your transmission serial number before ordering. For complete assembly, this flange works with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to ensure concentric alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201027 | HOUS.FRONT SECT | Front section supporting input shaft |
| 4657201012 | HOUSING REAR PART | Rear housing enclosing output assembly |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | Fastener for flange-to-hub connection |
| 4656301148 | FIXING PLATE | Locking plate for output shaft nut |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil return |
| 4657301033 | SCREEN SHEET | Coarse mesh filter for sump |
| 0636100803 | CAP SCREW | Bolt for housing cover retention |
| 4681301040 | OIL FEED.HOUSG. | Lubrication channel for bearings |
Frequently Asked Questions
Q: Can I use the ZF 4644.309.005 flange on a WG200 transmission?
A: Yes, this flange is mechanically compatible with WG200 models that share the same 24-spline output shaft and 130 mm bolt pattern. However, always cross-reference your transmission tag to confirm.
Q: What torque should I apply to the flange nut during installation?
A: ZF specifies 350 Nm (258 lb-ft) for the output shaft nut when using a new FIXING PLATE. Always replace the locking plate to prevent loosening.
Q: How do I know if my flange needs replacement versus just a new seal?
A: Inspect the flange splines for wear and the mating surface for scoring. If the CYLINDRICAL PIN shows fretting or the flange wobbles on the shaft, replace the entire 4644.309.005 unit rather than just the seal.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
