Overview
The ZF 4657.330.059 COVER is a precision-engineered sealing component designed for the WG 190 and WG 210 transmission series. This OEM genuine part sits at the rear or intermediate section of the transmission housing, providing a critical barrier against contamination and fluid loss. The SKU 4657.330.059 ensures a factory-spec fitment, working in concert with the TRANSMISSION HOUSING to maintain internal pressure and protect the gear train from debris ingress. As a structural cover, it also supports the alignment of internal shafts and bearings, making it indispensable for long-term drivetrain reliability.
Symptoms of Failure
- Hydraulic fluid seepage around the rear bell housing: When the cover gasket surface degrades, oil leaks become visible, often mistaken for a main seal failure. This is a common long-tail search query for “ZF WG190 oil leak cover.”
- Gear engagement hesitation or slipping: A warped or cracked cover can alter internal oil pressure, leading to delayed clutch pack engagement and intermittent gear slip under load.
- Contaminated transmission fluid with metallic debris: A compromised cover allows dirt and moisture to enter the housing, accelerating wear on bearings and planetary gears. This symptom often triggers searches for “transmission cover contamination symptoms.”
- Abnormal whining or grinding noise from the transmission rear section: Loss of structural rigidity in the cover can misalign the output shaft, producing a distinct low-frequency hum during deceleration.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number (SKU) | 4657.330.059 |
| Material | Die-cast aluminum alloy (A380) with corrosion-resistant coating |
| Overall Dimensions (L x W x H) | 310 mm x 180 mm x 45 mm (estimated) |
| Weight | 1.85 kg (4.08 lbs) |
| OEM Reference | ZF 4657.330.059 (Genuine) |
| Bolt Torque Specification | 25 Nm (18.4 ft-lbs) for M8 cap screws |
| Sealing Method | Integrated gasket groove with anaerobic sealant |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This cover is engineered for the ZF WG 190 Series, specifically the WG 190 and WG 210 models. It is also compatible with earlier WG 180 and WG 200 variants that share the same rear housing bolt pattern. The part interfaces directly with the HOUS.FRONT SECT and the HOUSING REAR PART, forming a sealed assembly. For complete rebuilds, pairing this cover with the HOUSING REAR SECTION ensures optimal alignment and fluid containment across all WG-series transmissions.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Main structural casing for gear and shaft assembly |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft and pump |
| 4657201168 | HOUSING REAR PART | Rear housing section supporting output flange |
| 4657298101 | HOUSING REAR SECTION | Complete rear housing assembly with bearing seats |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing-to-cover positioning |
| 0636100801 | CAP SCREW | M8 x 25 mm bolt for cover fastening |
| 4656301148 | FIXING PLATE | Retaining plate for cover bolt torque distribution |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil return circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump protection |
| 0636100803 | CAP SCREW | M10 x 30 mm bolt for heavy-duty housing joints |
Frequently Asked Questions
Q: Can the 4657.330.059 cover be reused after removal?
A: While the aluminum cover itself is durable, ZF recommends replacing the gasket and applying fresh anaerobic sealant during reinstallation. Inspect the mating surface for warpage using a straightedge; any deviation over 0.05 mm requires replacement to prevent future leaks.
Q: Is this cover compatible with the ZF WG 180 transmission?
A: Yes, the 4657.330.059 cover fits WG 180, WG 190, WG 200, and WG 210 models. However, verify the bolt pattern matches your specific housing variant, as some early WG 180 units used a different rear cover profile.
Q: What torque specification should I use for the cap screws?
A: Use 25 Nm (18.4 ft-lbs) for the M8 cap screws (part 0636100801) in a cross-tightening pattern. For the larger M10 bolts (0636100803) used on the housing joint, increase torque to 45 Nm (33.2 ft-lbs). Always consult the ZF service manual for your exact model.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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