Overview
The ZF 0730.501.299 RETAINING RING is a critical locking component engineered for the WG 200 and WG 92 series transmissions. This OEM genuine part secures internal shaft assemblies and gear clusters within the planetary gearset, preventing axial displacement under high torque loads. The SKU 0730.501.299 is specifically designed to fit into precision-machined grooves on the output shaft or sun gear, ensuring that adjacent components such as the TRANSMISSION HOUSING and HOUSING maintain correct spacing. Without this retaining ring, the entire drivetrain assembly risks catastrophic misalignment.
Symptoms of Failure
- Axial play in the output shaft: A worn or broken 0730.501.299 ring allows the shaft to move forward and backward, causing clunking noises during acceleration or deceleration.
- Gear engagement hesitation: When the retaining ring loses tension, the RANGE SELECTOR mechanism may struggle to lock into gear, leading to delayed shifts or partial engagement.
- Metallic debris in transmission fluid: Fatigue fractures in the ring produce small steel fragments that contaminate the oil, often visible during drain intervals.
- Unexpected transmission disengagement: In severe cases, the ring snaps completely, allowing the gearset to separate and causing a sudden loss of drive power.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0730.501.299 |
| Material | Spring steel (DIN 17222, hardened & tempered) |
| Inner Diameter | 68.0 mm |
| Outer Diameter | 78.5 mm |
| Thickness | 2.5 mm |
| Weight | 0.012 kg |
| OEM Reference | ZF 0730.501.299 |
| Surface Finish | Phosphate coated (corrosion resistant) |
Compatibility
This retaining ring is a direct replacement for ZF WG 200 series transmissions (including WG180, WG200, and WG210 variants) as well as the WG 92 series (WG92, WG92-2). It also fits select off-highway models where the planetary carrier uses a 68mm shaft groove. Always verify that the PERIPHERALS kit and the SUCTION TUBE are properly aligned before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660198001 | PERIPHERALS | External accessory mounting kit |
| 0501209818 | RANGE SELECTOR | Gear range shift actuator |
| 4660101011 | TRANSMISSION HOUSING | Main structural casing |
| 4660301018 | HOUSING | Secondary housing cover |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing |
| 0769123894 | TYPE PLATE | Identification nameplate |
| 4660221012 | SUCTION TUBE | Oil pickup line |
| 0634100317 | O-RING | Fluid seal for tube connection |
| 0636103273 | CAP SCREW | Fastener for housing bolts |
| 0750100022 | SCREW PLUG | Drain or fill port plug |
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