Overview
The ZF 4139.330.134 FLEXPLATE is a critical drivetrain component engineered specifically for the WG200 and WG201 transmission series. This OEM genuine part serves as the primary coupling interface between the engine’s crankshaft and the torque converter, absorbing torsional vibrations while transmitting rotational force into the gearbox. Positioned at the front of the transmission assembly, the flexplate ensures smooth power transfer and protects internal planetary gearsets from shock loads. The SKU 4139.330.134 is manufactured to ZF’s exacting tolerances, guaranteeing a direct bolt-on replacement without modification. When paired with a robust TRANSMISSION HOUSING (4644101216) or a TRANSMISSION HOUSING (4644301223), this flexplate maintains the precise axial alignment required for long service life in heavy-duty industrial applications.
Symptoms of Failure
When the ZF 4139.330.134 flexplate begins to fail, operators will notice distinct performance degradation. Torque converter shudder during low-speed engagement is a primary indicator, often felt as a vibration when shifting from neutral to drive. Metallic rattling or clicking noises from the bell housing suggest the flexplate’s mounting holes have elongated or the plate has developed stress cracks. Oil leaks at the front pump seal occur when flexplate warpage distorts the seal surface, allowing transmission fluid to escape. Intermittent loss of forward or reverse drive can result from stripped flexplate-to-torque converter bolts, a condition that worsens under load. Early diagnosis of these symptoms prevents catastrophic damage to the TYPE PLATE (0730365067) and surrounding assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4139.330.134 |
| OEM Reference | ZF 4139.330.134 |
| Material | High-tensile steel, heat-treated |
| Outer Diameter | 380 mm (estimated) |
| Center Bore | 65 mm |
| Bolt Hole Pattern | 6-hole, 10.9 grade |
| Weight | 4.2 kg (9.3 lbs) |
| Surface Finish | Phosphate-coated, anti-corrosion |
Compatibility
This flexplate is designed for ZF WG series powershift transmissions used in off-highway vehicles, material handlers, and agricultural machinery. Primary compatibility includes the WG200 and WG201 series, where it interfaces directly with the torque converter hub. It also fits select WG180 and WG190 variants when used with the correct GROOVED STUD (0631311009) kit. Always verify the bolt pattern matches your converter before installation. The flexplate works in conjunction with the COVER PLATE (4644303060) and COVER PLATE (4644303061) to seal the bell housing cavity.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101216 | TRANSMISSION HOUSING | Encloses gear train, supports shafts |
| 4644301223 | TRANSMISSION HOUSING | Alternate housing for WG201 series |
| 0730365067 | TYPE PLATE | Identification tag with serial number |
| 0631311009 | GROOVED STUD | Locating pin for housing alignment |
| 4644303060 | COVER PLATE | Seals bell housing access opening |
| 4644303061 | COVER PLATE | Alternate cover plate variant |
| 0634306525 | O-RING | Hydraulic seal for oil passages |
| 0636305026 | SCREW PLUG | Seals threaded inspection ports |
| 4644301279 | SCREEN SHEET | Filter debris from oil sump |
| 4644301088 | SEALING CAP | Protects unused hydraulic ports |
