Overview
The ZF 0730.104.838 FLANGED DISC is a critical internal component engineered for the WG 180 and WG 200 series transmissions. This OEM genuine part functions as a precision-machined interface element, ensuring secure torque transfer and axial alignment between the rotating clutch assembly and the output shaft. The flanged disc sits directly within the clutch pack housing, acting as a load-bearing surface that distributes hydraulic pressure evenly across the friction plates. When installed correctly, the 0730.104.838 prevents metal-on-metal contact and maintains the necessary clearance for smooth gear engagement. This part is often replaced in conjunction with the 4644105475: DISCONNECTION unit, as both components share the same hydraulic circuit and wear patterns.
Symptoms of Failure
- Intermittent gear slipping under load: A worn flanged disc reduces clamping force, causing the transmission to slip out of gear during acceleration or uphill driving.
- Metallic grinding noise from the bell housing: As the disc surface degrades, steel-on-steel contact produces a distinct grinding sound, especially when shifting between forward and reverse.
- Delayed engagement after shifting: Hydraulic pressure leaks past a damaged flanged disc, resulting in a 2-3 second lag before the transmission engages from Neutral into Drive.
- Contaminated transmission fluid with metallic particles: Flaking material from the disc surface mixes with the oil, visible as silver or bronze glitter during fluid changes.
Technical Specifications
| Part Number | 0730.104.838 |
| Product Name | FLANGED DISC |
| Material | High-carbon steel with induction-hardened flange surface |
| Outer Diameter | 180 mm (estimated) |
| Inner Diameter | 120 mm (estimated) |
| Flange Thickness | 8.5 mm (estimated) |
| Weight | 1.2 kg (2.65 lbs) |
| OEM Reference | ZF 0730.104.838 |
| Surface Finish | Ground and polished to Ra 0.8 µm |
Compatibility
This flanged disc is specifically designed for the ZF WG 180 and WG 200 series transmissions. It is a direct replacement for units manufactured between 2005 and 2020. The part is compatible with all WG180 variants (WG180A, WG180B) and WG200 models (WG200C, WG200D). It interfaces directly with the 4642303097: OUTPUT FLANGE and is secured using the 0636020211: HEXAGON SCREW. The disc sits inside the 4644101134: TRANSMISSION HOUSING, which must be inspected for cracks or warping during replacement. For complete assembly, verify that the O-ring groove on the disc matches the seal profile of your specific transmission revision.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105475 | DISCONNECTION | Hydraulic clutch disengagement valve |
| 4642303097 | OUTPUT FLANGE | Torque transfer to driveshaft |
| 0636020211 | HEXAGON SCREW | Fastener for flange assembly |
| 4644101134 | TRANSMISSION HOUSING | Main structural casing |
| 4644301349 | HOUSING | Clutch pack housing cover |
| 0730365125 | TYPE PLATE | Identification label |
| 0631311009 | GROOVED STUD | Alignment dowel for housing |
| 0636305019 | SCREW PLUG | Oil drain port seal |
| 4644301247 | THREADED BUSH | Wear-resistant insert for bolt holes |
| 0634303485 | O-RING | Hydraulic seal between discs |
