Overview
The ZF 4656.006.139 is a precision-engineered OEM genuine component designed specifically for the WG 115 Series transmission. This part functions as a critical sealing and alignment element within the gearbox assembly, ensuring proper oil flow and preventing contamination between the main housing and the front section. The SKU 4656.006.139 is manufactured to ZF’s original factory tolerances, making it a direct replacement for worn units in heavy-duty industrial applications. It sits between the TRANSMISSION HOUSING and the HOUS.FRONT SECT, where it maintains structural integrity under high torque loads.
Symptoms of Failure
When the 4656.006.139 begins to degrade, operators often notice specific performance issues. Look for these warning signs to avoid costly downtime:
- Oil seepage at the housing joint: A common failure mode where degraded sealing allows transmission fluid to escape between the HOUSING REAR PART and the main case.
- Intermittent gear engagement: Worn material can cause misalignment, leading to delayed or rough shifting under load.
- Increased operating noise: A high-pitched whine or grinding sound from the transmission center section indicates the part has lost its damping properties.
- Contaminated fluid: Debris bypassing a failed seal can be detected during routine oil analysis, often accompanied by metallic particles.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.006.139 |
| Material | High-grade aluminum alloy with nitrile rubber sealing element |
| Weight | 0.85 kg (1.87 lbs) |
| Outer Diameter | 142 mm |
| Inner Diameter | 98 mm |
| Thickness | 12 mm |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF WG 115 Series |
Compatibility
This genuine ZF part is primarily engineered for the WG 115 transmission series, but it also fits select models in the WG180 and WG200 families when used with the appropriate HOUSING REAR SECTION. It is compatible with all WG 115 variants produced after 2010, including the WG115-2 and WG115-3. Always verify your transmission serial number before ordering, as earlier WG 100 series units require a different sealing profile.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101057 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4656201078 | HOUSING REAR PART | Rear housing segment for output assembly |
| 4656298050 | HOUSING REAR SECTION | Alternate rear housing variant for WG115 |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 4656301148 | FIXING PLATE | Retention plate for bearing preload |
| 0636100817 | CAP SCREW | M10 fastener for housing attachment |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil return line |
| 4656301017 | SCREEN SHEET | Coarse mesh filter for suction side |
| 0636100803 | CAP SCREW | M8 fastener for cover plate |
Frequently Asked Questions
Q: Can I use this part in a WG180 transmission without modification?
A: The 4656.006.139 is dimensionally compatible with WG180 units that share the same housing bolt pattern as the WG115. However, we recommend comparing the sealing groove depth against your existing part, as WG180 variants may require a thicker gasket.
Q: How do I know if my 4656.006.139 has failed internally?
A: Look for a gradual increase in transmission operating temperature combined with fluid darkening. A simple pressure test at the housing joint will reveal leaks that are not visible externally.
Q: Is this part interchangeable with the earlier 4656.006.138?
A: No. The .139 revision includes an additional sealing lip that the .138 lacks. Installing the older version will result in immediate oil bypass and potential gear damage.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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