Overview
This genuine ZF 0730.308.138 SNAP RING is a critical retention component engineered specifically for the BP210 and BP230 series transmissions. Its primary function is to secure internal assemblies—such as bearing packs and gear clusters—within the main housing bore, preventing axial movement under high torque and vibration. The snap ring sits in a precisely machined groove inside the transmission case, ensuring that rotating elements remain correctly aligned. As an OEM genuine part, SKU 0730.308.138 guarantees the exact metallurgical properties and dimensional tolerances required for reliable long-term service in heavy-duty industrial drivetrains.
Symptoms of Failure
- Transmission case oil leaks at the joint seam: When the snap ring fatigues or breaks, it can allow the TRANSMISSION HOUSING to shift slightly, breaking the seal and causing fluid seepage.
- Gear slipping under load: A worn or dislodged snap ring permits axial play in the gear train, leading to intermittent engagement loss and harsh shifting.
- Unusual metallic rattling from the bell housing: Loose internal components due to a failed snap ring create a distinct rattle that worsens with RPM changes.
- Premature bearing failure: Without proper axial retention, bearings experience side-loading, generating heat and debris that accelerates wear across the assembly.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number (SKU) | 0730.308.138 |
| Material | Spring steel (C67S or equivalent), phosphate coated |
| Inside Diameter (nominal) | 138 mm |
| Cross Section (thickness) | 3.5 mm |
| Weight | ~0.04 kg |
| OEM Reference | ZF 0730.308.138 |
| Application | BP210 / BP230 series main case retention |
Compatibility
This snap ring is designed for the ZF BP210 and BP230 series transmissions. It is also commonly used in the WG180, WG200, and WG210 series where the same internal bore diameter and groove geometry are employed. The part interfaces directly with the HOUS.FRONT SECT and the HOUSING REAR PART, locking the internal assembly between these two castings. Always verify groove condition in the CASE before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4681101002 | TRANSMISSION HOUSING | Main structural case enclosing gear sets |
| 4681201007 | HOUS.FRONT SECT | Forward section housing input shaft and pump |
| 4681201008 | HOUSING REAR PART | Rear section supporting output shaft bearings |
| 4681298001 | CASE | Complete case assembly with bore grooves |
| 0631306074 | CYLINDRICAL PIN | Alignment dowel for case halves |
| 0636100801 | CAP SCREW | Fastener for housing joint |
| 4681301015 | FIXING PLATE | Locks snap ring in groove |
| 4681301016 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4681301017 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | Bolt for rear housing attachment |
Frequently Asked Questions
Q: Can I reuse the old snap ring if it looks intact?
A: No. Snap rings lose tension over time due to cyclic loading. Always replace with a new genuine ZF 0730.308.138 to ensure proper retention force and avoid internal damage.
Q: Does this snap ring fit the WG180 transmission?
A: Yes, the WG180 shares the same internal bore diameter and groove location as the BP210/230 series. However, always confirm groove width and depth in your specific case before ordering.
Q: What tools are needed for installation?
A: Use dedicated snap ring pliers with 90-degree tips. Never use screwdrivers or pry bars, as they can distort the ring and cause premature failure.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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