Overview
This genuine OEM ZF 0634.801.249 ANILLO DE SELLADO (sealing ring) is a critical component engineered for the WG100, WG130, and WG131 transmission series. Positioned within the hydraulic control unit or clutch piston assembly, this precision seal prevents cross-contamination between oil circuits and maintains the necessary pressure for smooth gear engagement. As a factory-original part, the SKU 0634.801.249 guarantees exact dimensional tolerances and material composition required for long-term reliability in heavy construction machinery.
Symptoms of Failure
When this sealing ring degrades, operators often notice these specific issues:
- External oil seepage near the transmission housing – A slow drip or wet spot around the seal area, often mistaken for a gasket failure.
- Delayed or harsh clutch engagement – The transmission hesitates before shifting, or you feel a sudden jolt as pressure drops and then recovers.
- Intermittent gear slipping under load – The machine loses power momentarily when climbing or carrying heavy loads, indicating internal pressure loss.
- Contaminated transmission fluid – Dark, burnt-smelling oil with metallic particles, caused by the seal breaking down and allowing debris into the hydraulic circuit.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0634.801.249 |
| Outer Diameter (approx.) | 68.5 mm |
| Inner Diameter (approx.) | 55.0 mm |
| Thickness | 4.2 mm |
| Material | Nitrile rubber (NBR) with PTFE coating |
| Weight | 12 grams |
| OEM Reference | ZF 0634.801.249 |
Compatibility
This sealing ring is designed for the following ZF transmission models:
- WG100 – Common in compact wheel loaders and telehandlers.
- WG130 – Used in medium-duty construction machinery like backhoe loaders.
- WG131 – Variant with reinforced clutch packs for higher torque applications.
- WG180 – Larger models may use this seal in auxiliary pressure circuits.
- WG200 – Some heavy-duty graders and dump trucks with this transmission series.
Note: Always verify your transmission serial number against the OEM parts catalog to confirm fitment, as internal revisions may affect seal compatibility.
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