Overview
The ZF 0501.308.831 ANGLE RING is a precision-engineered sealing component designed for the WG 150 transmission series. This OEM genuine part serves as a critical interface between the rotating shaft and the stationary housing, ensuring proper alignment and preventing fluid migration within the gearbox assembly. The SKU 0501.308.831 specifically addresses the sealing requirements of the WG150 planetary gear set, where it maintains hydraulic pressure integrity during torque conversion. When installed alongside the TRANSMISSION HOUSING (4642101108) or the TRANSMISSION HOUSING (4642301208), this angle ring ensures concentric alignment of the output shaft assembly.
Symptoms of Failure
- External oil seepage at the bell housing interface: A worn 0501.308.831 angle ring allows transmission fluid to escape past the seal, leaving visible drips on the housing exterior. This is a common indicator of angle ring degradation in WG150 units.
- Intermittent gear engagement hesitation: When the angle ring loses its sealing capacity, hydraulic pressure drops in the clutch pack circuits, causing delayed shifts between forward and reverse gears.
- Whining noise during cold starts: A hardened or cracked angle ring permits air ingress into the hydraulic system, producing a high-pitched whine that diminishes as the fluid warms up.
- Contaminated transmission fluid: Failure of the 0501.308.831 allows external debris to enter the oil gallery, visible as metallic particles or sludge on the dipstick.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0501.308.831 |
| Material | Nitrile rubber (NBR) with steel insert |
| Inner Diameter | 85.0 mm ± 0.2 mm |
| Outer Diameter | 105.0 mm ± 0.3 mm |
| Thickness | 12.5 mm ± 0.1 mm |
| Weight | 0.18 kg |
| OEM Reference | ZF 0501.308.831 |
| Operating Temperature | -40°C to +120°C |
Compatibility
This angle ring is specifically engineered for the ZF WG 150 transmission series, but its sealing geometry also accommodates the WG 180 and WG 200 models when used with the correct GROOVED STUD (0631311009) for proper retention. The 0501.308.831 is compatible with all WG150 variants including the WG150-1, WG150-2, and WG150-3. For WG200 applications, verify that the TYPE PLATE (0730365125) confirms the housing casting number matches the angle ring seat diameter. It is not recommended for use in WG250 or larger series without adapter modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301208 | TRANSMISSION HOUSING | Alternate housing for WG150 series |
| 0730365125 | TYPE PLATE | Identification plate for transmission variant |
| 0631311009 | GROOVED STUD | Fastener for angle ring retention |
| 4642301168 | SCREEN SHEET | Filter mesh for oil intake |
| 4642301169 | SCREEN SHEET | Secondary filter screen |
| 0636100621 | HEXAGON SCREW | Mounting bolt for housing assembly |
| 0630361029 | SEALING CAP | Port plug for pressure test points |
| 4642306254 | ADAPTER | Interface plate for auxiliary pumps |
| 0634303340 | O-RING | Static seal for adapter joints |
