Overview
The ZF 0730.308.099 SNAP RING is a precision-engineered retaining component designed specifically for the WG190 and WG210 series transmissions. This OEM genuine part, identified by SKU 0730.308.099, functions as a critical axial locking mechanism that secures internal gear assemblies, bearing packs, and shaft components within the transmission housing. Positioned directly inside the main casing, this snap ring prevents unwanted lateral movement of rotating elements, ensuring consistent gear alignment and load distribution under high-torque conditions. Without this ring, the entire drivetrain assembly risks catastrophic misalignment.
Symptoms of Failure
- Intermittent gear slipping under load — When the snap ring loses its tension or fractures, internal components shift axially, causing gears to momentarily disengage during acceleration. This often manifests as a “clunking” sensation when shifting between forward and reverse.
- Metallic grinding noise from the bell housing — A worn or broken 0730.308.099 allows bearing races to contact the TRANSMISSION HOUSING, producing a distinct high-pitched scraping sound that intensifies with RPM.
- Chronic transmission fluid leaks near the front seal — Axial play caused by a failed snap ring can distort the HOUS.FRONT SECT interface, compromising the front pump seal and allowing ATF to weep externally.
- Hard shifting or delayed engagement — Misalignment of the clutch pack due to a missing snap ring forces the valve body to compensate, resulting in harsh 1-2 shifts or a 2-second delay when selecting Drive.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0730.308.099 |
| Material | Spring Steel (C67S) with Phosphate Coating |
| Inner Diameter | 73.0 mm |
| Outer Diameter | 80.5 mm |
| Thickness | 2.5 mm |
| Weight | 12 grams |
| OEM Reference | ZF 0730.308.099 |
| Operating Temperature | -40°C to +150°C |
Compatibility
This snap ring is a direct-fit component for the ZF WG190 and WG210 transmission families. It also serves as a service replacement for earlier WG180 and WG200 models where the snap ring groove dimensions match. The part interfaces directly with the HOUSING REAR PART and the HOUSING REAR SECTION to secure the output shaft bearing. Always verify groove width and shaft diameter before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631306816 | CYLINDRICAL PIN | Aligns housing sections during assembly |
| 0636100801 | CAP SCREW | Secures the front housing to the main case |
| 4681301015 | FIXING PLATE | Prevents snap ring rotation within the groove |
| 4681301016 | SCREEN SHEET | Filters debris from the lubrication circuit |
| 4681301017 | SCREEN SHEET | Secondary filtration for the oil pump intake |
| 0636100803 | CAP SCREW | Fastens the rear housing cover plate |
Frequently Asked Questions
Q: Can I reuse the old snap ring if it looks intact?
A: No. Snap rings lose their spring tension over time due to thermal cycling. Always replace the 0730.308.099 with a new OEM part to guarantee proper axial retention.
Q: Does this snap ring fit the ZF WG180 transmission?
A: Yes, the WG180 uses the same snap ring groove dimensions as the WG190. However, verify your housing part number against the TRANSMISSION HOUSING to confirm compatibility.
Q: What tools are required for installation?
A: You will need a snap ring pliers set with 90-degree tips and a depth micrometer to measure the groove clearance. A FIXING PLATE is also recommended to lock the ring in position.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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