Overview
The ZF 4644.330.288 INPUT FLANGE is a critical driveline component engineered for the WG150 and WG160 series transmissions. This OEM genuine part serves as the primary coupling point between the transmission output shaft and the driveshaft, transferring rotational torque from the gearbox to the vehicle’s axles. Machined from high-strength forged steel, the flange ensures precise alignment and vibration-free power delivery under heavy loads. As a direct replacement for SKU 4644.330.288, this input flange is designed to withstand the demanding conditions of commercial and industrial applications, including construction equipment, buses, and heavy-duty trucks.
Symptoms of Failure
When the ZF 4644.330.288 INPUT FLANGE begins to wear, operators often notice oil leaks around the transmission output seal, caused by flange wobble or surface scoring. A second common symptom is gear slipping or delayed engagement during acceleration, as the flange loses its tight fit on the shaft splines. You may also detect persistent vibration or driveline shudder at highway speeds, indicating flange imbalance or bolt-hole elongation. Finally, visible corrosion or pitting on the flange face can lead to premature seal failure and fluid contamination.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.330.288 |
| Material | Forged Steel (C45 or equivalent) |
| Overall Diameter | 180 mm (7.09 in) |
| Bolt Circle Diameter | 150 mm (5.91 in) |
| Center Bore Diameter | 45 mm (1.77 in) |
| Flange Thickness | 22 mm (0.87 in) |
| Weight | 2.8 kg (6.17 lbs) |
| OEM Reference | ZF 4644.330.288 |
| Surface Treatment | Zinc-plated / Phosphate-coated |
Compatibility
This input flange is specifically designed for the ZF WG150 and WG160 transmission families, but it also fits select variants of the WG180 and WG200 series when used with the correct output shaft. The 4644.330.288 flange is commonly found in ZF Ecomat and Ecolife transmissions for city buses and refuse trucks. For proper installation, always verify spline count and pilot bore dimensions against your existing flange. When replacing this part, inspect the TRANSMISSION HOUSING (4642101047) and TRANSMISSION HOUSING (4642301207) for cracks or wear. Additionally, the TYPE PLATE (0730365067) should be checked for correct model identification, and the GROOVED STUD (0631311009) must be torqued to specification during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101047 | TRANSMISSION HOUSING | Encloses and supports gear train components |
| 4642301207 | TRANSMISSION HOUSING | Alternate housing variant for WG series |
| 0730365067 | TYPE PLATE | Identifies transmission model and serial number |
| 0631311009 | GROOVED STUD | Secures flange to output shaft with positive lock |
| 4642301168 | SCREEN SHEET | Filters debris from transmission fluid |
| 4642301169 | SCREEN SHEET | Fine-mesh filter for hydraulic circuits |
| 0636100621 | HEXAGON SCREW | Fastens housing and cover assemblies |
| 4642301186 | SCREEN SHEET | Oil strainer for sump protection |
| 4644106300 | SHIFT SYSTEM | Controls gear selection and clutch actuation |
| 4644306500 | COVER PLATE | Seals access opening on transmission housing |
Frequently Asked Questions
Q: Can the 4644.330.288 INPUT FLANGE be used on a ZF WG180 transmission?
A: Yes, this flange is compatible with WG180 models that share the same output shaft spline pattern and bolt circle. Always measure your existing flange diameter and pilot bore before ordering.
Q: What torque specification should I use for the flange retaining nut?
A: ZF recommends a torque of 250–280 Nm (184–207 lb-ft) for the center nut, applied with thread locker. Refer to the service manual for your specific transmission model.
Q: How do I know if my flange is worn beyond repair?
A: Inspect the splines for galling or twisting, check the bolt holes for elongation, and measure flange runout with a dial indicator. Runout exceeding 0.10 mm (0.004 in) indicates replacement is necessary.
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Phone: +86 158 2286 3467 |
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