Overview
The ZF 0634.304.731 O-RING is a precision-engineered sealing component designed for the WG100, WG130, and WG131 transmission series. This OEM genuine part sits within the hydraulic control circuit and differential housing interface, where it prevents pressurized oil from bypassing critical passages. By maintaining a tight seal between mating surfaces, the SKU 0634.304.731 ensures consistent clutch engagement and lubrication flow. When installed alongside a 2093109002: DIFFERENTIAL, this O-ring becomes essential for preserving system pressure and preventing cross-contamination between oil galleries.
Symptoms of Failure
- External oil seepage at the differential housing joint – A worn 0634.304.731 O-ring allows transmission fluid to weep past the sealing face, leaving visible drips under the vehicle after parking.
- Erratic gear engagement under load – When this seal loses elasticity, hydraulic pressure drops inside the valve body, causing delayed or harsh shifts during acceleration.
- Whining noise from the differential area – Insufficient sealing permits air ingestion into the oil circuit, leading to cavitation and audible bearing distress near the 0750117075: TAPER ROLLER BEARING.
- Low transmission fluid level without visible leaks – Internal leakage past the O-ring can redirect oil into non-pressurized cavities, causing gradual fluid loss that mimics external leaks.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 0634.304.731 |
| Inner Diameter (ID) | 34.0 mm |
| Cross-Section (CS) | 3.0 mm |
| Material | Nitrile Butadiene Rubber (NBR) 70 Shore A |
| Weight | 4.2 grams |
| OEM Reference | ZF 0634.304.731 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This O-ring is specifically engineered for ZF WG-series powershift transmissions. It is a direct fit for the WG100, WG130, and WG131 models. While primarily designed for these three series, the 0634.304.731 may also be compatible with certain WG180 and WG200 variants that share the same differential housing architecture. Always verify the sealing groove dimensions against your transmission’s service manual. For differential assembly work, this seal is commonly replaced in conjunction with the 2093209095: DIFFERENTIAL and the 2093309071: DIFF.HOUSING to ensure complete sealing integrity.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109002 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports rotating differential gears |
| 2093209095 | DIFFERENTIAL | Secondary torque distribution unit |
| 2093309071 | DIFF.HOUSING | Encloses differential gear set |
| 0631100223 | SPRING PIN | Secures shift fork alignment |
| 0730300820 | THRUST WASHER | Controls axial play in gear sets |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to wheel axles |
| 2097309085 | DIFFERENTIAL AXLE | Carries differential side gears |
| 5838300811 | THRUST WASHER | Reduces friction in planetary sets |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Provides final gear reduction |
Frequently Asked Questions
Q: Can the 0634.304.731 O-ring be reused after disassembly?
No. This is a single-use sealing component. Once compressed, the NBR material takes a permanent set and will not re-seal properly. Always install a new OEM O-ring when servicing the differential housing.
Q: How do I know if my WG130 needs this specific O-ring?
If you observe oil tracking from the differential-to-housing mating line, or if your transmission exhibits slow engagement after sitting overnight, the 0634.304.731 is likely compromised. Inspect the groove for debris before installation.
Q: Is this O-ring compatible with synthetic transmission fluids?
Yes. The NBR compound is resistant to mineral-based and synthetic ATF fluids commonly used in ZF WG-series transmissions. Avoid ester-based oils, which can cause swelling.
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ZF 0634.304.731 O-RING – O-Ring RFQ Support
PartsZF helps B2B buyers source ZF 0634.304.731 O-RING with fast RFQ support, expert part-number lookup, documentation review, and export coordination. This O-ring page is built from confirmed catalog, media, and reference data to reduce sourcing uncertainty for construction machinery transmission parts.
Part-Number Summary
Use ZF number 0634.304.731 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: HOUSING
- Illustration section: TRANSMISSION HOUSING
Cross Reference Support
- Cross-reference record available for RFQ review.
Specification Snapshot
| ZF part number | 0634.304.731 |
|---|---|
| Normalized SKU | 0634304731 |
| Part name | O-RING |
| Product category | O-ring |
| Cross-reference support | Available for RFQ review |
| Weight | 0.01 |
Image and Documentation Notes
Current product media status: fallback. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
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