Overview
The ZF 0730.300.405 RETAINING RING is a critical axial locking component engineered for heavy-duty construction machinery transmissions. This OEM genuine part secures internal gear assemblies, bearing packs, and shaft components within the transmission housing, preventing axial displacement under extreme torque loads. The SKU 0730.300.405 is specifically designed to fit into precision-machined grooves, ensuring that planetary gear sets and clutch packs remain correctly positioned during high-vibration operation. When installed alongside the 2098117002: HOUSING, this retaining ring provides the necessary preload to maintain gear mesh integrity. It also interfaces directly with the 2098301052: REAR AXLE HOUS. to prevent end-play in the output shaft assembly.
Symptoms of Failure
- Transmission gear slippage under load: When the retaining ring fatigues or cracks, axial clearance increases, causing planetary gears to lose proper engagement. Operators often report intermittent slipping during uphill grading or heavy digging cycles.
- Metallic grinding noise from the bell housing: A worn 0730.300.405 allows bearing races to shift, producing a distinct low-frequency grinding sound that worsens as transmission oil temperature rises.
- Unexplained oil leaks at the rear axle interface: Loss of axial retention can distort the 2098301052: REAR AXLE HOUS. seal surface, leading to chronic oil seepage around the output flange.
- Hard shifting or delayed engagement: Excessive axial play from a failed retaining ring disrupts clutch pack clearance, resulting in harsh shifts between forward and reverse gears.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0730.300.405 |
| Type | External Retaining Ring (Snap Ring) |
| Material | Spring Steel (DIN 17222 / SAE 1070) |
| Nominal Diameter | 130 mm (estimated) |
| Cross-Section Thickness | 4.0 mm |
| Weight | 0.045 kg |
| Surface Finish | Phosphate-coated (anti-corrosion) |
| OEM Reference | ZF 0730.300.405 |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This retaining ring is primarily used in ZF WG series powershift transmissions for construction machinery. It is a direct fit for the WG180, WG200, and WG220 models commonly found in wheel loaders, dozers, and telehandlers. The 0730.300.405 also appears in certain ERGOpower and Ecomix transmission variants. For proper installation, the ring must be seated against the 0636103300: STUD and secured with the 0637101164: HEXAGON NUT to prevent rotation. Always verify groove dimensions before assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2098117002 | HOUSING | Main transmission casing that houses gear sets |
| 2098301052 | REAR AXLE HOUS. | Output housing supporting final drive components |
| 0636103300 | STUD | Threaded dowel for alignment and fastening |
| 0637101164 | HEXAGON NUT | Locking nut for stud retention |
| 0636102566 | STUD | Secondary alignment stud for housing |
| 0636100960 | STUD | Short stud for brake housing attachment |
| 0637101167 | HEXAGON NUT | M10 locking nut for high-torque applications |
| 0634303044 | O-RING | Seal for hydraulic pressure circuits |
| 2098317013 | BRAKE HOUSING | Left-side brake actuator housing |
| 2098317028 | BRAKE HOUSING | Right-side brake actuator housing |
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