Overview
The ZF 0730.501.558 RETAINING RING is a critical axial locking component engineered for the WG200 and WG92 series transmissions. This OEM genuine part secures internal assemblies—such as gear clusters and bearing packs—within the main shaft housing, preventing unwanted lateral movement under high torque loads. The SKU 0730.501.558 is precision-formed to match ZF’s original tolerances, ensuring a tight, vibration-resistant fit that maintains gear alignment and clutch pack clearance. When installed alongside the 4660198001 PERIPHERALS kit, this retaining ring contributes to the overall structural integrity of the transmission’s rotating group.
Symptoms of Failure
- Intermittent gear slippage under load: A worn or fatigued retaining ring allows axial play in the gear stack, causing momentary disengagement between meshing teeth during acceleration.
- Unusual metallic rattling from the bell housing: When the ring loses its spring tension, internal components shift, producing a distinct rattle that intensifies with engine RPM.
- Low hydraulic pressure in the range selector circuit: Axial movement of the shaft can misalign oil passages, starving the 0501209818 RANGE SELECTOR of necessary lubrication and causing delayed shifts.
- Visible wear debris in the transmission fluid: Fretting corrosion from a loose ring generates fine metallic particles that contaminate the oil and accelerate bearing wear.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0730.501.558 |
| Material | Spring steel (DIN 17222), phosphate coated |
| Inside Diameter (nominal) | 85.0 mm |
| Cross-Section Thickness | 3.2 mm |
| Weight | 18 g |
| OEM Reference | ZF 0730.501.558 |
| Operating Temperature Range | -40°C to +150°C |
| Hardness (Rockwell) | HRC 44-48 |
Compatibility
This retaining ring is a direct-fit component for the following ZF transmission families: WG180, WG200, WG92, WG94, and WG98 series. It is specifically designed for the main shaft retaining groove in the 4660101011 TRANSMISSION HOUSING and the auxiliary housing section (part 4660301018 HOUSING). Always verify the groove width and shaft diameter against your transmission’s service manual before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660198001 | PERIPHERALS | External accessory drive assembly |
| 0501209818 | RANGE SELECTOR | Hydraulic shift control valve |
| 4660101011 | TRANSMISSION HOUSING | Main structural casing |
| 4660301018 | HOUSING | Auxiliary housing section |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing |
| 0769123894 | TYPE PLATE | Identification nameplate |
| 4660221012 | SUCTION TUBE | Oil pick-up tube |
| 0634100317 | O-RING | Hydraulic seal |
| 0636103273 | CAP SCREW | Fastener for housing |
| 0750100022 | SCREW PLUG | Oil drain/fill plug |
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