Overview
The ZF 4657.330.076 is a precision-engineered OEM genuine component designed specifically for the WG 160 Series transmission. This part functions as a critical sealing and alignment element within the gearbox assembly, ensuring proper fluid containment and structural integrity under high-torque conditions. The SKU 4657.330.076 sits between the main housing sections, acting as a barrier against contamination and pressure loss. When paired with the 4656101037: TRANSMISSION HOUSING, it creates a sealed environment that protects internal gears and bearings from debris and thermal stress.
Symptoms of Failure
- External oil seepage around the mid-housing joint: When the 4657.330.076 degrades, transmission fluid may escape between the 4656201075: HOUS.FRONT SECT and the rear casing, leading to low fluid levels and potential overheating.
- Intermittent gear engagement hesitation: A worn seal can allow air ingress, causing hydraulic pressure fluctuations that delay clutch pack engagement during shifting.
- Accelerated bearing wear noise: Loss of sealing integrity permits fine metallic particles to circulate, scoring bearings and producing a whining or grinding sound from the transmission housing.
- Visible fluid droplets under the bell housing area: This part’s failure often results in drips accumulating near the 4656201035: HOUSING REAR PART interface, especially after extended highway operation.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.330.076 |
| Material | Nitrile rubber (NBR) with steel insert |
| Outer Diameter | 165 mm |
| Inner Diameter | 130 mm |
| Thickness | 8.5 mm |
| Weight | 0.32 kg |
| Temperature Range | -40°C to +120°C |
| Hardness (Shore A) | 70 ± 5 |
Compatibility
This genuine ZF part is engineered for the WG 160 Series but also fits select variants of the WG 180 and WG 200 transmissions where the housing interface dimensions match. It is commonly used in off-highway vehicles, municipal trucks, and industrial material handlers. Always verify the 4472239178: HOUSING REAR PART compatibility when retrofitting to older transmission builds.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101037 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft and pump |
| 4656201035 | HOUSING REAR PART | Rear casing enclosing output shaft and PTO interface |
| 4472239178 | HOUSING REAR PART | Alternate rear housing variant for extended wheelbase models |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 4656301148 | FIXING PLATE | Retention plate for securing seal assembly |
| 0636100817 | CAP SCREW | M10 fastener for housing bolt torque |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil return circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for sump protection |
| 0636100803 | CAP SCREW | M8 fastener for screen sheet retention |
Frequently Asked Questions
Q: Can the 4657.330.076 be reused after transmission overhaul?
A: No. This is a single-use sealing component. Reusing it risks immediate fluid leakage and internal contamination. Always install a new OEM genuine part during rebuilds.
Q: How do I confirm this part fits my WG 160 transmission?
A: Check the stamped serial number on the TRANSMISSION HOUSING near the bell housing flange. If the prefix matches WG160-xxxx, this seal is compatible. For WG180 or WG200 units, measure the housing bore diameter to ensure 165 mm clearance.
Q: What torque specification applies to the cap screws securing this part?
A: Use 45 Nm for the CAP SCREW (M10) and 22 Nm for the CAP SCREW (M8). Apply thread locker to prevent loosening under vibration.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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